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PRODUCT DATASHEET
AAT2603
Total Power Solution for Portable Applications
General Description
The AAT2603 is a highly integrated power management solution for handheld mobile systems. It provides six regulated voltages from a single-cell Lithium-ion/polymer battery or a 5V supply. The six outputs are produced by six regulators; two switching step-down regulators and four low-dropout (LDO) regulators. Each voltage regulator has its own independent enable pin. The high efficiency step-down regulators are fully integrated and switch at a high 1.5 MHz fixed frequency. They automatically transition to variable frequency operation at light loads for improved efficiency. DC-DC1 (Buck1) is designed for high output current and low dropout voltage (200mV at 1.2A). DC-DC2 (Buck2) is a 600mA regulator with a two step dynamic output voltage capability. One option allows the output voltage of DC-DC2 (Buck2) to be set to either 1.0V or 1.3V with the SELB2 logic pin. LDO regulators LDO1 and LDO2 can supply up to 400mA of load current with output voltages adjustable down to 1.5V. LDO regulators LDO3 and LDO4 can supply up to 200mA of current and provide good noise and power supply rejection. LDO3 and LDO4 have output voltages externally adjustable down to 1.2V. The AAT2603 is available in a Pb-free thermally enhanced 28-pin TQFN44 package and is rated for operation over the -40C to +85C temperature range.
Features
* VIN Range: 2.7V to 5.5V * Two Step-Down Regulators DC-DC1(Buck1): 1.2A, Low Dropout Voltage * Externally Adjustable: VFBB1 = 0.6V VOUT Range: 0.6V to VINB1 * Fixed: VOUT = 3.3V Factory Programmable to any Two Voltage Levels from 0.6V to 4.0V * DC-DC2(Buck2): 0.6A, Low Dropout Voltage * Externally Adjustable: VFBB2 = 0.6V VOUT Range: 0.6V to VINB2 * Fixed: VOUT = 1.0V[SELB2='0']/1.3V[SELB2='1'] Factory Programmable to any Two Voltage Levels from 0.6V to 4.0V Fixed 1.5MHz Switching Frequency Internally Compensated Current Mode Control High Efficiency over the Entire Load Range Four LDO Regulators * LDO1: 400mA LDO * LDO2: 400mA LDO * LDO3: 200mA, Low Noise LDO * LDO4: 200mA, Low Noise LDO * Fast Turn-On and Turn-Off time * Short Circuit and Over-Current Protection * Over-Temperature Protection * Temperature Range: -40C to +85C * TQFN44-28 Package
Applications
* * * * * Handheld GPS Handheld Instruments PDAs and Handheld Computers Portable Media Players Smart Phones
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PRODUCT DATASHEET
AAT2603
Total Power Solution for Portable Applications
Typical Application Circuit
L1 3.3H LX1 FBB 1 INB2 CINB2 4.7F AIN CAIN 2.2F INL 12 C INL12 2.2F INL 34 CINL34 2.2F ENB1 ENB2 ENL 1 ENL 2 ENL 3 ENL 4 SELB 2 BYP C BYP 10nF AGND PGND 1 PGND2 OUTL4 C OUTL4 4.7F 100k OUTL3 C OUTL3 4.7F FBL3 100k 1.2V (Minimum): 200mA 1.2V (Minimum): 200mA OUTL1 C OUTL1 4.7F 100k 1.5V (Minimum): 400mA L2 1.2H LX2 FBB 2 1.0V & 1.3V: 600mA COUTB2 10F 3.3V: 1.2A C OUTB1 22F
2.7V to 5.5V C INB1 4.7F
INB1
FBL 1
AAT2603
OUTL2 C OUTL2 4.7F 100k 1.5V (Minimum): 400mA
FBL 2
FBL4
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PRODUCT DATASHEET
AAT2603
Total Power Solution for Portable Applications
Pin Descriptions
Pin #
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 EP
Symbol
LX2 ENB2 FBB2 ENL3 AGND FBL3 OUTL3 INL34 OUTL4 FBL4 ENL4 BYP ENL1 FBL1 OUTL1 INL12 OUTL2 FBL2 ENL2 AIN FBB1 ENB1 SELB2 LX1 PGND1 INB1 INB2 PGND2
Function
DC-DC2 (Buck2) switching node. Connect the output inductor to LX2. Connected internally to the drains o f both high-side and low-side switches. DC-DC2 (Buck2) enable input. Active high. DC-DC2 (Buck2) feedback input. For externally adjustable versions, connect a resistor divider from Buck2 output to FBB2 to AGND to set the Buck2 output voltage. LDO3 enable input. Active high. Analog ground. Connect AGND to PGND1 and PGND2 as close as possible to the device. LDO3 feedback input. Connect a resistor divider from OUTL3 to FBL3 to AGND to set the LDO3 output voltage. LDO3 output. Should be closely decoupled to AGND with a 4.7F or greater capacitor. LDO3 and LDO4 input. Should be closely decoupled to AGND with a 2.2F or greater capacitor. LDO4 output. Should be closely decoupled to AGND with a 4.7F or greater capacitor. LDO4 feedback input. Connect a resistor divider from OUTL4 to FBL4 to AGND to set the LDO4 output voltage. LDO4 enable input. Active high. Reference Bypass. Bypass BYP to AGND with a 0.01F or greater capacitor to reduce the LDO1 output noise. LDO1 enable input. Active high. LDO1 feedback input. Connect a resistor divider from OUTL1 to FBL1 to AGND to set the LDO1 output voltage. LDO1 output. Should be closely decoupled to AGND with a 4.7F or greater capacitor. LDO1 and LDO2 input. Should be closely decoupled to AGND with a 2.2F or greater capacitor. LDO2 output. Should be closely decoupled to AGND with a 4.7F or greater capacitor. LDO2 feedback input. Connect a resistor divider from OUTL2 to FBL2 to AGND to set the LDO2 output voltage. LDO2 enable input. Active high. Analog voltage input. AIN is the bias supply for the device. Should be closely decoupled to AGND with a 2.2F or greater capacitor. DC-DC1 (Buck1) feedback input. For externally adjustable versions, connect a resistor divider from Buck1 output to FBB1 to AGND to set the Buck1 output voltage. DC-DC1 (Buck1) enable input. Active high. Dynamically adjusts the output voltage of DC-DC2 (Buck2) (Logic High=1.3V, Logic Low=1.0V) DC-DC1 (Buck1) switching node. Connect the output inductor to LX1. Connected internally to the drains of both high-side and low-side switches. DC-DC1 (Buck1) power ground. Connected internally to the source of the Buck1 N-channel synchronous rectifier. Connect PGND1 to PGND2 and AGND as close as possible to the device. DC-DC1 (Buck1) power input. Connected internally to the source of the Buck1 P-channel switch. Should be closely decoupled to PGND1 with a 4.7F or greater capacitor. DC-DC2 (Buck2) power input. Connected internally to the source of the Buck2 P-channel switch. Should be closely decoupled to PGND2 with a 4.7F or greater capacitor. DC-DC2 (Buck2) power ground. Connected internally to the source of the Buck2 N-channel synchronous rectifier. Connect PGND2 to PGND1 and AGND as close as possible to the device. Exposed paddle (bottom). Connect to ground as close as possible to the device.
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PRODUCT DATASHEET
AAT2603
Total Power Solution for Portable Applications
Pin Configuration
TQFN44-28 (Top View)
ENB1 SELB2 LX1 PGND1 INB1 INB2 PGND2
28 27 26 25 24 23 22 21 20 19
LX2 ENB2 FBB2 ENL3 AGND FBL3 OUTL3
1 2 3 4 5 6 7 8 9 10 11 12 13 14
EP
18 17 16 15
FBB1 AIN ENL2 FBL2 OUTL2 INL12 OUTL1
FBL1 ENL1 BYP ENL4 FBL4 OUTL4 INL34
Part Number Descriptions
Output Voltage1 Part Number
AAT2603INJ-1-T1 AAT2603INJ-2-T1 AAT2603INJ-3-T1 DC-DC1 (Buck1) Ext. Adj. (VFBB1 = 600mV) 3.3V Ext. Adj. (VFBB1 = 600mV) DC-DC2 (Buck2) (SELB2 = Low) Ext. Adj. (VFBB2 = 600mV) 1.0V 1.0V DC-DC2 (Buck2) (SELB2 = High) Ext. Adj. (VFBB2 = 775mV) 1.3V 1.3V LDOs 1-4 Ext. Adj. (VFBLX = 1.2V) Ext. Adj. (VFBLX = 1.2V) Ext. Adj. (VFBLX = 1.2V)
Absolute Maximum Ratings1
TA = 25C unless otherwise noted. Symbol Description
INBX, INLXX, AIN to AGND ENBX, ENLX, FBBX, FBLX, BYP to AGND LX1 to PGND1 LX2 to PGND2 PGNDX to AGND, PGND1 to PGND2 Operating Temperature Range Storage Temperature Range Maximum Soldering Temperature (at leads, 10 sec)
Value
-0.3 to 6.0 -0.3 to VAIN+0.3 -0.3 to VINB1+0.3 -0.3 to VINB2+0.3 -0.3 to 0.3 -40 to 150 -65 to 150 300
Units
V V V V V C C C
Recommended Operating Conditions
Symbol
JA PD
Description
Thermal Resistance Maximum Power Dissipation
Value
50
Units
C/W W
2
1. Stresses above those listed in Absolute Maximum Ratings may cause permanent damage to the device. Functional operation at conditions other than the operating conditions specified is not implied. Only one Absolute Maximum rating should be applied at any one time.
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PRODUCT DATASHEET
AAT2603
Total Power Solution for Portable Applications
Electrical Characteristics1
VAIN = VINB1 = VINB2 = VINL12 = VINL34 = 3.6V, CBYP = 10nF, TA = -40C to 85C, unless noted otherwise. Typical values are at TA = 25C. Symbol Description Conditions Min
2.7 VENB1 = VENL3 = 3.6V, No Load , VFBB1 = VFBL3 = 3.6V VENx = AGND VIN rising VIN falling Hysteresis 100
Typ
Max
5.5 200 1.0 2.6
Units
V A A V V mV MHz s V % % % V V % %/V A A A m m s V % % % V V % %/V A A A m m s
Power Supply Input Voltage Range VIN IQ Quiescent Current ISHDN Input Shutdown Current UVLO Under-Voltage Lockout
1.8 250 1.5 200 0.6 -1.5 -2.5 -3.0 0.591 0.585 VINB1 +1.5 +2.5 +3.0 0.609 0.615
Oscillator Frequency FOSC tS,BYP Bypass Filter Startup Time VENB1 = 3.6V DC-DC1 (Buck1): 1.2A Step-Down Converter VOUT_RANGE Output Voltage Range TA = 25C, 20mA Load Output Voltage Accuracy VOUT_ACC TA = -40C to 85C, 20mA Load VOUT_TOL Output Voltage Tolerance 0A to 1.2A Load; VIN = 2.7V to 5.5V TA = 25C, 20mA Load VFBB1_ACC Feedback Voltage Accuracy TA = -40C to 85C, 20mA Load VOUT/IOUT Load Regulation 0A to 1.2A Load VOUT/VIN Line Regulation VIN = 2.7V to 5.5V ISHDN Shutdown Current VENB1 = GND ILX_LEAK LX Leakage Current VINB1 = 5.5V, VLX1 = 0V to VINB1 ILIM P-Channel Current Limit RDS(ON)H High Side Switch On-Resistance Low Side Switch On-Resistance RDS(ON)L tS Start-Up Time Enable to Output Regulation DC-DC2 (Buck2): 600mA Step-Down Converter VOUT_RANGE Output Voltage Range TA = 25C, 20mA Load VOUT_ACC Output Voltage Accuracy TA = - 40C to 85C, 20mA Load VOUT_TOL Output Voltage Tolerance 0mA to 600mA Load; VIN = 2.7V to 5.5V TA = 25C, 20mA Load Feedback Voltage Accuracy SELB2 = '0 TA = -40C to 85C, 20mA Load VFBB2_ACC TA = 25C, 20mA Load Feedback Voltage Accuracy SELB2 = '1' TA = -40C to 85C, 20mA Load VOUT/IOUT Load Regulation 0mA to 600mA Load VOUT/VIN Line Regulation VIN = 2.7V to 5.5V ISHDN Shutdown Current VENB2 = GND ILX_LEAK LX Leakage Current VINB2 = 5.5V, VLX2 = 0 to VINB2 ILIM P-Channel Current Limit High Side Switch On-Resistance RDS(ON)H RDS(ON)L Low Side Switch On-Resistance tS Start-Up Time Enable to Output Regulation
0.6 0.6 0.4 0.2
1.0 1.0 1.7 145 200 200 0.6 -1.5 -2.5 -3.0 0.591 0.585 0.763 0.756 VINB2 +1.5 +2.5 +3.0 0.609 0.615 0.787 0.794
0.6 0.6 0.775 0.775 0.2 0.2
1.0 1.0 1.3 230 180 200
1. The AAT2603 is guaranteed to meet performance specification from -40C to +85C and is assured by design, characterization and correlation with statistical process controls.
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PRODUCT DATASHEET
AAT2603
Total Power Solution for Portable Applications
Electrical Characteristics1
VAIN = VINB1 = VINB2 = VINL12 = VINL34 = 3.6V, CBYP = 10nF, TA = -40C to 85C, unless noted otherwise. Typical values are at TA = 25C. Symbol Description Conditions Min
1.5 1.2 1.2 1.2 0.3 0.08 400 400mA Load f < 10KHz, COUTL1,2 = 4.7F, 10mA Load VBYP already enabled; COUT = 4.7F 1.2 1.182 1.17 1.164 0.2 0.02 200 200mA Load f < 10KHz, COUTL3,4 = 4.7F, 10mA Load Power BW: 100~100KHz VBYP already enabled; COUT = 4.7F 1.4 VEN = 1.4V2 140 15 0.4 1.5 1500 200 50 45 200 350 1000 300 50 200 500
Typ
Max
VINL12 1.218 1.23 1.236
Units
V V V V % %/V mA mA mV dB s V V V V % %/V mA mA mV dB Vrms s V V A C C
400mA LDO Regulators (LDO1, LDO2) VOUT_RANGE Output Voltage Range VFB_ACC VFB_TOL VOUT/IOUT VOUT/VIN IOUT(MAX) ILIM VDO PSRR tS 200mA LDO VOUT_RANGE VFB_ACC Feedback Voltage Accuracy Feedback Voltage Tolerance Load Regulation Line Regulation Maximum Output Current Output Current Limit Dropout Voltage Power Supply Rejection Ratio Start-Up Time Regulators (LDO3, LDO4) Output Voltage Range Feedback Voltage Accuracy TA = 25C, 1mA Load TA = -40C to 85C, 1mA Load 0mA to 400mA Load, VIN = 2.7V to 5.5V 1mA to 400mA Load VIN = 3.3V to 5.5V, 100mA Load
Feedback Voltage Tolerance VFB_TOL VOUT/IOUT Load Regulation VOUT/VIN Line Regulation IOUT(MAX) Maximum Output Current ILIM Output Current Limit VDO Dropout Voltage PSRR Power Supply Rejection Ratio eN RMS Output Noise tS Start-Up Time Logic Inputs/Outputs VEN(H) Input Logic High Voltage VEN(L) Input Logic Low Voltage IEN Logic Input Current Thermal TSD Over-Temperature Shutdown Threshold TSD(HYS) Over-Temperature Shutdown Hysteresis
TA = 25C, 1mA Load TA = -40C to +85C, 1mA Load 0mA to 200mA Load, VIN = 2.7V to 5.5V 0mA to 200mA Load VIN = 3.3V to 5.5V, 100mA Load
VINL34 1.218 1.23 1.236
1. The AAT2603 is guaranteed to meet performance specification from -40C to +85C and is assured by design, characterization and correlation with statistical process controls. 2. The enable pins have internal 1.6M pull-down resistors.
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2603.2008.06.1.0
PRODUCT DATASHEET
AAT2603
Total Power Solution for Portable Applications
Typical Characteristics--DC-DC1 (Buck1)
Efficiency vs. Output Current
(VOUTB1 = 3.3V; L = 3.3H)
100 90 80 0.4
Load Regulation
(VOUTB1 = 3.3V; L = 3.3H) Output Voltage Error (%)
VIN = 5V VIN = 4.2V VIN = 3.6V
Efficiency (%)
70 60 50 40 30 20 10 0 0.1 1 10 100
0.2
0
VIN = 5V VIN = 4.2V VIN = 3.6V
1000 10000
-0.2
-0.4 0.1
1
10
100
1000
10000
Output Current (mA)
Output Current (mA)
Line Regulation
(VOUTB1 = 3.3V; L = 3.3H)
0.4 0.4
Output Voltage Error vs. Temperature
(VOUTB1 = 3.3V; VIN = 4.2V) Output Voltage Error (%)
IOUT = 1.2A IOUT = 600mA IOUT = 300mA IOUT = 100mA IOUT = 10mA IOUT = 1mA IOUT = 0.1mA IOUT = 1.2A IOUT = 0.1mA
0.2
Output Voltage Error (%)
0.2
0
0
-0.2
-0.2
-0.4 3.6
4
4.4
4.8
5.2
-0.4 -40
-15
10
35
60
85
Input Voltage (V)
Temperature (C)
P-Channel RDS(ON) vs. Input Voltage
(VOUTB1 = 3.3V)
250 0.4
Load Transient
(VOUTB1 = 3.3V; VIN = 4.2V; IOUTB1 = 100mA to 1200mA; CFF = 0pF)
P-Channel RDS(ON) (m)
200
Output Voltage (AC Coupled) (top)
0.2
Output Current (bottom)
0 -0.2 -0.4 1.5 1 0.5 0
150
100
50
T = 120C T = 100C T = 85C T = 25C
3.1 3.5 3.9 4.3 4.7 5.1 5.5
0 2.7
Input Voltage (V)
Time (100s/div)
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PRODUCT DATASHEET
AAT2603
Total Power Solution for Portable Applications
Typical Characteristics--DC-DC1 (Buck1)
Load Transient
(VOUTB1 = 3.3V; VIN = 4.2V; IOUTB1 = 100mA to 1200mA; CFF = 100pF)
0.1
Load Transient
(VOUTB1 = 3.3V; VIN = 4.2V; IOUTB1 = 600mA to 1200mA; CFF = 0pF)
0.2 0.1
Output Voltage (AC Coupled) (top)
Output Voltage (AC Coupled) (top)
Output Current (bottom)
Output Current (bottom)
0 -0.1 -0.2 1.5 1 0.5 0
0 -0.1 -0.2 1.5 1 0.5 0
Time (100s/div)
Time (50s/div)
Load Transient
(VOUTB1 = 3.3V; VIN = 4.2V; IOUTB1 = 600mA to 1200mA; CFF = 100pF)
0.1
Line Transient
(VOUTB1 = 3.3V; VIN = 4.2V to 5V; IOUTB1 = 700mA) Output Voltage (AC Coupled) (bottom)
5
Output Voltage (AC Coupled) (top)
0 -0.1 -0.2 1.5 1 0.5 0
Input Voltage (top)
Output Current (bottom)
4
0.1 0 -0.1 -0.2
Time (50s/div)
Time (100s/div)
Soft-Start
(VOUTB1 = 3.3V; VIN = 4.2V; IOUTB1 = 1.2A)
6 4 2 0 4 3 2 1 0
Enable Voltage (top)
Output Voltage (bottom)
Time (100s/div)
8
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PRODUCT DATASHEET
AAT2603
Total Power Solution for Portable Applications
Typical Characteristics--DC-DC2 (Buck2)
Efficiency vs. Output Current
(VOUTB2 = 1.3V; L = 1.5H)
100 90 80 100 90 80
Efficiency vs. Output Current
(VOUTB2 = 1V; L = 1.2H)
Efficiency (%)
70 60 50 40 30 20 10 0 0.1 1 10 100
Efficiency (%)
70 60 50 40 30 20 10 0 0.1 1 10 100
VIN = 5V VIN = 4.2V VIN = 3.6V VIN = 2.7V
1000
VIN = 5V VIN = 4.2V VIN = 3.6V VIN = 2.7V
1000
Output Current (mA)
Output Current (mA)
Load Regulation
(VOUTB2 = 1.3V; L = 1.5H)
0.4 0.4
Load Regulation
(VOUTB2 = 1V; L = 1.2H)
VIN = 5V VIN = 4.2V VIN = 3.6V VIN = 2.7V
Output Voltage Error (%)
0.2
Output Voltage Error (%)
0.2
VIN = 5V VIN = 4.2V VIN = 3.6V VIN = 2.7V
0
0
-0.2
-0.2
-0.4 0.1
1
10
100
1000
-0.4 0.1
1
10
100
1000
10000
Output Current (mA)
Output Current (mA)
Line Regulation
(VOUTB2 = 1.3V; L = 1.5H)
0.6 0.6
Line Regulation
(VOUTB2 = 1V; L = 1.2H) Output Voltage Error (%)
IOUT = 600mA IOUT = 300mA IOUT = 100mA IOUT = 10mA IOUT = 1mA IOUT = 0.1mA IOUT = 600mA IOUT = 300mA IOUT = 100mA IOUT = 10mA IOUT = 1mA IOUT = 0.1mA
Output Voltage Error (%)
0.4 0.2 0 -0.2 -0.4 -0.6 2.7
0.4 0.2 0 -0.2 -0.4 -0.6 2.7
3.1
3.5
3.9
4.3
4.7
5.1
5.5
3.1
3.5
3.9
4.3
4.7
5.1
5.5
Input Voltage (V)
Input Voltage (V)
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PRODUCT DATASHEET
AAT2603
Total Power Solution for Portable Applications
Typical Characteristics--DC-DC2 (Buck2)
Output Voltage Error vs. Temperature
(VOUTB2 = 1.3V; VIN = 3.6V)
IOUT = 600mA IOUT = 0.1mA
Switching Frequency vs. Input Voltage
(VOUTB2 = 1.3V; IOUTB2 = 600mA) Switching Frequency (MHz)
85 1.505 1.5 1.495 1.49 1.485 1.48 1.475 1.47 1.465 1.46 2.7 3.1 3.5 3.9 4.3 4.7 5.1 5.5
0.6
Output Voltage Error (%)
0.4 0.2 0 -0.2 -0.4 -0.6 -40
-15
10
35
60
Temperature (C)
Input Voltage (V)
P-Channel RDS(ON) vs. Input Voltage
(VOUTB2 = 1.3V)
400 0.1 0.05
Load Transient
(VOUTB2 = 1.3V; VIN = 3.6V; IOUTB2 = 100mA to 600mA; CFF = 0pF)
P-Channel RDS(ON) (m)
350
Output Voltage (AC Coupled) (top)
300 250 200 150 100 50 0 2.7
0 -0.05 -0.1 1 0.5 0
Output Current (bottom)
T = 120C T = 100C T = 85C T = 25C
3.1 3.5 3.9 4.3 4.7 5.1 5.5
Input Voltage (V)
Time (50s/div)
Load Transient
(VOUTB2 = 1.3V; VIN = 3.6V; IOUTB2 = 100mA to 600mA; CFF = 100pF)
0.1 0.05
Load Transient
(VOUTB2 = 1.3V; VIN = 3.6V; IOUTB2 = 300mA to 600mA; CFF = 0pF)
0.05
Output Voltage (AC Coupled) (top)
Output Voltage (AC Coupled) (top)
Output Current (bottom)
Output Current (bottom)
0 -0.05 -0.1 1 0.5 0
0 -0.05
1 0.5 0
Time (50s/div)
Time (20s/div)
10
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2603.2008.06.1.0
PRODUCT DATASHEET
AAT2603
Total Power Solution for Portable Applications
Typical Characteristics--DC-DC2 (Buck2)
Load Transient
(VOUTB2 = 1.3V; VIN = 3.6V; IOUTB2 = 300mA to 600mA; CFF = 100pF)
0.05 6 5
Line Transient
(VOUTB2 = 1.3V; VIN = 3.6 to 4.2V; IOUTB2 = 300mA)
0.3
Output Voltage (AC Coupled) (bottom)
0.25 0.2 0.15 0.1 0.05 0 -0.05 -0.1
Output Voltage (AC Coupled) (top)
Input Voltage (top)
0 -0.05
4 3 2 1 0 -1 -2
Output Current (bottom)
1 0.5 0
Time (20s/div)
Time (50s/div)
Soft-Start
(VOUTB2 = 1.3V; VIN = 3.6V; IOUTB2 = 600mA)
4
Enable Voltage (top)
Output Voltage (bottom)
2 0 1.5 1 0.5 0
Time (100s/div)
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PRODUCT DATASHEET
AAT2603
Total Power Solution for Portable Applications
Typical Characteristics--LDO1/LDO2
Load Regulation
(VOUTL1&2 = 3V; VIN = 3.6V)
0.4 0.4
Load Regulation
(VOUTL1&2 = 1.5V; VIN = 3.6V) Output Voltage Error (%)
Output Voltage Error (%)
0.2
0.2
0
0
-0.2
-0.2
-0.4 0.1
1
10
100
1000
-0.4 0.1
1
10
100
1000
Output Current (mA)
Output Current (mA)
Line Regulation
(VOUTL1&2 = 1.5)
0.4
Output Voltage Error vs. Temperature
(VOUTL1&2 = 2.8V; VIN = 3.6V)
0.4
Output Voltage Error (%)
0.2
IOUT = 400mA IOUT = 100mA IOUT = 10mA IOUT = 1mA IOUT = 0.1mA
Output Voltage Error (%)
0.2
0
0
-0.2
-0.2
IOUT = 400mA IOUT = 0.1mA
-0.4 -40 -15 10 35 60 85
-0.4 2.7
3.1
3.5
3.9
4.3
4.7
5.1
5.5
Input Voltage (V)
Temperature (C)
Load Transient
(VOUTL1&2 = 2.8V; VIN = 3.6V; IOUTL1&2 = 1mA to 50mA)
0.04 0.02 0.1 0.05
Load Transient
(VOUTL1&2 = 2.8V; VIN = 3.6V; IOUTL1&2 = 1mA to 200mA)
Output Voltage (AC Coupled) (top)
0 -0.02 -0.04
Output Voltage (AC Coupled) (top)
0 -0.05 -0.1 0.4 0.2 0 -0.2
Output Current (bottom)
Output Current (bottom)
0.05 0 -0.05
Time (100s/div)
Time (100s/div)
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PRODUCT DATASHEET
AAT2603
Total Power Solution for Portable Applications
Typical Characteristics--LDO1/LDO2
Load Transient
(VOUTL1&2 = 2.8V; VIN = 3.6V; IOUTL1&2 = 1mA to 400mA)
0.2 0.1 5 4
Line Transient
(VOUTL1&2 = 2.8V; VIN = 3.6 to 4.2V; IOUTL1&2 = 400mA)
Output Voltage (AC Coupled) (top)
Input Voltage (top)
Output Voltage (bottom)
Output Current (bottom)
0 -0.1 -0.2
3
0.2 0.1 0 -0.1 -0.2
0.5 0
Time (200s/div)
Time (20s/div)
Soft-Start
(VOUTL1&2 = 2.8V; VIN = 3.6V; IOUTL1&2 = 400mA)
Enable Voltage (top)
4
Output Voltage (bottom)
2 0 3 2 1 0
Time (500s/div)
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PRODUCT DATASHEET
AAT2603
Total Power Solution for Portable Applications
Typical Characteristics--LDO3/LDO4
Load Regulation
(VOUTL3&4 = 3V; VIN = 3.6V)
0.4 0.4
Load Regulation
(VOUTL3&4 = 1.2V; VIN = 3.6V) Output Voltage Error (%)
Output Voltage Error (%)
0.2
0.2
0
0
-0.2
-0.2
-0.4 0 1 10 100 1000
-0.4 0.1 1 10 100 1000
Output Current (mA)
Output Current (mA)
Line Regulation
(VOUTL3&4 = 1.2V)
0.4 0.4
Output Voltage Error vs. Temperature
(VOUTL3&4 = 2.8V; VIN = 3.6V) Output Voltage Error (%)
IOUT = 400mA IOUT = 100mA IOUT = 10mA IOUT = 1mA IOUT = 0.1mA
Output Voltage Error (%)
0.2
0.2
0
0
-0.2
-0.2
IOUT = 200mA IOUT = 0.1mA
-0.4 -40 -15 10 35 60 85
-0.4 2.7
3.1
3.5
3.9
4.3
4.7
5.1
5.5
Input Voltage (V)
Temperature (C)
Load Transient
(VOUTL3&4 = 2.8V; VIN = 3.6V; IOUTL3&4 = 1mA to 50mA)
0.01
Load Transient
(VOUTL3&4 = 2.8V; VIN = 3.6V; IOUTL3&4 = 1mA to 100mA)
0.02
Output Voltage (AC Coupled) (top)
Output Voltage AC Coupled) (top)
0 -0.01 -0.02
0 -0.02 -0.04
Output Current (bottom)
Output Current (bottom)
0.05 0
0.1 0
Time (100s/div)
Time (100s/div)
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2603.2008.06.1.0
PRODUCT DATASHEET
AAT2603
Total Power Solution for Portable Applications
Typical Characteristics--LDO3/LDO4
Load Transient
(VOUTL3&4 = 2.8V; VIN = 3.6V; IOUTL3&4 = 1mA to 200mA)
0.05 5
Line Transient
(VOUTL3&4 = 2.8V; VIN = 3.6 to 4.2V; IOUTL3&4 = 200mA)
4
Output Voltage (AC Coupled) (top)
Input Voltage (AC Coupled) (top)
Output Voltage (bottom)
Output Current (bottom)
0 -0.05
3 0.15 0.1 0.05 0 -0.05 -0.1
0.2 0
Time (100s/div)
Time (20s/div)
Soft-Start
(VOUTL3&4 = 2.8V; VIN = 3.6V; IOUTL3&4 = 200mA)
6 4
Enable Voltage (top)
Output Voltage (bottom)
2 0 3 2 1 0
Time (500s/div)
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PRODUCT DATASHEET
AAT2603
Total Power Solution for Portable Applications
Functional Block Diagram
AIN INB 2 INB 1
LX1 ENB1 ENB2 ENL 1 ENL 2 ENL 3 ENL 4 OUTL 1 SELB 2 BYP LDO1 FBL 1 Interface and Support LX2 DC-DC2 (Buck2) FBB 2 PGND 2 DC-DC1 (Buck1) FBB 1 PGND 1
OUTL 2 LDO2 FBL 2 INL12
OUTL 3 LDO3 FBL 3
INL34
OUTL 4 LDO4 FBL 4 AGND
Functional Description
The AAT2603 is a highly integrated voltage regulating power management unit for mobile handsets or other portable devices. It includes two switch-mode step-down converters (600mA [DC-DC2] and 1.2A [DC-DC1]), and four low-dropout (LDO) regulators (two: 200mA, two: 400mA). It operates from an input voltage between 2.7V and 5.5V making it ideal for lithium-ion or 5V regulated power sources. All six converters have separate enable pins for ease of use.
2.7V to 5.5V. The output voltage range is 0.6V to VIN. The high 1.5MHz switching frequency allows the use of small external inductor and capacitor. The step-down converters offer soft-start to limit the current surge seen at the input and eliminate output voltage overshoot. The current across the internal P-channel power switch is sensed and turns off when the current exceeds the current limit. Also, thermal protection completely disables switching if internal dissipation becomes excessive, thus protecting the device from damage. The junction over-temperature threshold is 140C with 15C of hysteresis. DC-DC1 (Buck1) is designed for a peak continuous output current of 1.2A. The high-side power switch has been designed with a low RDSON of 145m to allow for a minimum dropout voltage of 174mV at full load current.
Step-Down Converters
The AAT2603 switch-mode, step-down converters are constant frequency peak current mode PWM converters with internal compensation. The input voltage range is
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PRODUCT DATASHEET
AAT2603
Total Power Solution for Portable Applications
It was designed to maintain over 90% efficiency at its maximum rated output current load of 1.2A with a 3.3V output. Peak efficiency is above 95%. Buck1 has excellent transient response, load and line regulation. Transient response time is typically less than 20s. The peak input current is limited to 1.7A. DC-DC2 (Buck2) is a 600mA step-down regulator designed to dynamically shift between two output voltages by toggling the SELB2 pin. The internal reference voltage of the buck regulator is changed based on the position of the SELB2 pin. Buck2 is designed to maintain over 85% efficiency at its maximum rated output current of 600mA with a 1.2V output. Peak efficiency is above 90%. Buck2 has excellent transient response, load and line regulation. The peak inductor current is limited to 1.3A. The two step-down converters on the AAT2603 have highly flexible output voltage programming capability. The output voltages can be factory programmed to preset output voltages or set by external resistors. The "Part Number Descriptions" table lists the available voltage options for step-down converters Buck1 and Buck2. Option 1 has externally adjustable output voltages for both step-down converters. The dynamic voltage scaling for Buck2 is still useable with external feedback resistors. When SELB2 is in the low position the feedback voltage is compared to a 600mV reference, while when SELB2 is high the reference voltage is 775mV. For most other options, the output voltages of Buck2 are factory programmed.
Application Information
DC-DC1/DC-DC2
The step-down converter uses peak current mode control with slope compensation to maintain stability for duty cycles greater than 50%. The output inductor value must be selected so the inductor current down slope meets the internal slope compensation requirements. Table 1 displays suggested inductor values for various output voltages. Manufacturer's specifications list both the inductor DC current rating, which is a thermal limitation, and the peak current rating, which is determined by the saturation characteristics. The inductor should not show any appreciable saturation under normal load conditions. Some inductors may meet the peak and average current ratings yet result in excessive losses due to a high DCR. Always consider the losses associated with the DCR and its effect on the total converter efficiency when selecting an inductor. It is recommended that the inductor current rating exceed the current limit of the step-down converter. See Table 2 for example inductor values/vendors.
Input Capacitor
Select a 4.7F to 10F X7R or X5R ceramic capacitor for the input; see Table 3 for suggested capacitor components. To estimate the required input capacitor size, determine the acceptable input ripple level (VPP) and solve for CIN (CINB1/CINB2). The calculated value varies with input voltage and is a maximum when VIN is double the output voltage.
LDO Regulators
The AAT2603 includes four LDO regulators. The regulators operate from the 2.7V to 5.5V input voltage to a regulated output voltage. The LDO regulators have adjustable output voltages set by resistors. Each LDO consumes 50uA of quiescent current. The two 200mA LDO regulators are stable with a small 4.7F ceramic output capacitor. The low 200mV dropout voltage at 200mA load allows a regulated output voltage approaching the input voltage. Low output noise voltage and high power supply rejection make these regulators ideal for powering noise sensitive circuitry. The two 400mA LDO regulators are stable with a small 4.7F ceramic output capacitor. The low 300mV dropout voltage at 400mA load allows a regulated output voltage approaching the input voltage. These LDOs offer high power supply rejection.
CIN =
V VO * 1- O VIN VIN VPP - ESR * FS IO
VO V 1 * 1 - O = for VIN = 2 * VO VIN VIN 4 CIN(MIN) = 1 VPP - ESR * 4 * FS IO
Always examine the ceramic capacitor DC voltage coefficient characteristics when selecting the proper value. For example, the capacitance of a 10F, 6.3V, X5R ceramic capacitor with 5.0V DC applied is actually about 6F.
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PRODUCT DATASHEET
AAT2603
Size (mm) LxWxH
5x5.2x2.2
Total Power Solution for Portable Applications
Manufacturer
TDK
Part Number/ Type
LTF5022
Inductance (H)
1.2 1.8 2.2 3.3 1 1.8 2.7 3.3 1.2 1.8 2.2 2.7 3.3 1 1.5 2.2 3.3
Rated Current (A)
4.3 3.6 3.2 2.5 2.6 2.35 2.03 1.8 2.8 2.45 2.35 1.95 1.8 4 3.7 3.2 2.9
DCR (m) (max)
25 32 40 60 30 50 60 65 20 25 28 30 35 19 (typ) 22 (typ) 29 (typ) 36 (typ)
WE-TPC Type M Wurth Electronik WE-TPC Type MH
4.8x4.8x1.8
4.8x4.8x2.8
Murata
LQH55D
5x5.7x4.7
Table 1: Suggested Inductor Components.
Configuration
Adjustable and Fixed Output Voltage
Output Voltage
1V, 1.2V, 1.3V 1.5V, 1.8V 2.5V 2.8V, 3.3V
Inductor Value
1.0H to 1.2H 1.5H to 1.8H 2.2H to 2.7H 3.3H
The input capacitor RMS ripple current varies with the input and output voltage and will always be less than or equal to half of the total DC load current.
Table 2: Inductor Values for Specific Output Voltages.
VO V * 1- O = VIN VIN
for VIN = 2 * VO.
D * (1 - D) =
0.52 =
1 2
The maximum input capacitor RMS current is:
IRMS = IO *
VO V * 1- O VIN VIN
Part Number
0603ZD105K 0603ZD225K C1608X5R1E105K C1608X5R1C225K C1608X5R1A475K C2012X5R1A106K C3216X5R1A226K GRM188R61C105K GRM188R61A225K GRM219R61A106K GRM31CR71A226K LMK107BJ475KA
Manufacturer
AVX
Value
1F 2.2F 1F 2.2F 4.7F 10F 22F 1F 2.2F 10F 22F 4.7F
Voltage
10 10 25 16 10 10 10 16 10 10 10 10
Temp. Co.
X5R
Case
0603 0603
TDK
X5R 0805 1206 X5R X7R X5R 0603 0805 1206 0603
Murata Taiyo Yuden
Table 3: Suggested Capacitor Components.
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AAT2603
Total Power Solution for Portable Applications
IRMS(MAX) =
VO VO
IO 2
V The term V appears in both the input voltage ripple and input capacitor RMS current equations and is a maximum when VO is twice VIN. This is why the input voltage ripple and the input capacitor RMS current ripple are a maximum at 50% duty cycle.
IN IN
* 1-
The output voltage droop due to a load transient is dominated by the capacitance of the ceramic output capacitor. During a step increase in load current, the ceramic output capacitor alone supplies the load current until the loop responds. Within several switching cycles, the loop responds and the inductor current increases to match the load current demand. The relationship of the output voltage droop during the several switching cycles to the output capacitance can be estimated by:
The input capacitor provides a low impedance loop for the edges of pulsed current drawn by the AAT2603 stepdown switching regulators. Low ESR/ESL X7R and X5R ceramic capacitors are ideal for this function. To minimize stray inductance, the capacitor should be placed as closely as possible to the IC. This keeps the high frequency content of the input current localized, minimizing EMI and input voltage ripple. A laboratory test set-up typically consists of two long wires running from the bench power supply to the evaluation board input voltage pins. The inductance of these wires, along with the low-ESR ceramic input capacitor, can create a high Q network that may affect converter performance. This problem often becomes apparent in the form of excessive ringing in the output voltage during load transients. Errors in the loop phase and gain measurements can also result. Since the inductance of a short PCB trace feeding the input voltage is significantly lower than the power leads from the bench power supply, most applications do not exhibit this problem. In applications where the input power source lead inductance cannot be reduced to a level that does not affect the converter performance, a high ESR tantalum or aluminum electrolytic should be placed in parallel with the low ESR, ESL bypass ceramic. This dampens the high Q network and stabilizes the system.
COUT =
3 * ILOAD VDROOP * FS
Once the average inductor current increases to the DC load level, the output voltage recovers. The above equation establishes a limit on the minimum value for the output capacitor with respect to load transients. The internal voltage loop compensation also limits the minimum output capacitor value to 10F for DC-DC2 and 22F for DC-DC1. This is due to its effect on the loop crossover frequency (bandwidth), phase margin, and gain margin. Increased output capacitance will reduce the crossover frequency with greater phase margin. The maximum output capacitor RMS ripple current is given by:
IRMS(MAX) =
VOUT * (VIN(MAX) - VOUT) L * FS * VIN(MAX) 2* 3 *
1
Dissipation due to the RMS current in the ceramic output capacitor ESR is typically minimal, resulting in less than a few degrees rise in hot-spot temperature.
Feedback Resistor Selection
Resistors R1 and R2 of Figure 1 program the output to regulate at a voltage higher than 0.6V. To limit the bias current required for the external feedback resistor string while maintaining good noise immunity, the minimum suggested value for R2 is 59k. Although a larger value will further reduce quiescent current, it will also increase the impedance of the feedback node, making it more sensitive to external noise and interference. Table 42 summarizes the resistor values for various output voltages with R2 set to either 59k for good noise immunity or 221k for reduced no load input current.
Output Capacitor
The output capacitor limits the output ripple and provides holdup during large load transitions. A 10F to 22F X5R or X7R ceramic capacitor typically provides sufficient bulk capacitance to stabilize the output during large load transitions and has the ESR and ESL characteristics necessary for low output ripple. A 10F X5R or X7R ceramic capacitor is required for DC-DC2 and a 22F X5R or X7R ceramic capacitor is required for DC-DC1; see Table 3 for suggested capacitor components.
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PRODUCT DATASHEET
AAT2603
Total Power Solution for Portable Applications
1.5V VOUT R1 = V -1 * R2 = 0.6V - 1 * 59k = 88.5k REF
The AAT2603 step-down regulators, combined with an external feedforward capacitor (CFF in Figure 1), deliver enhanced transient response for extreme pulsed load applications.
VDC-DC1/VDC-DC2
Ceramic, tantalum, or aluminum electrolytic capacitors may be selected for CINL12/CINL34/CAIN. There is no specific capacitor ESR requirement for CINL12/CINL34/CAIN. However, for 200mA/400mA LDO regulators output operation, ceramic capacitors are recommended for CINL12/CINL34/CAIN due to their inherent capability over tantalum capacitors to withstand input current surges from low impedance sources such as batteries in portable devices.
Output Capacitor
For proper load voltage regulation and operational stability, a capacitor is required between pins VOUTLX and AGND. The COUTLX capacitor connection to the LDO regulator ground pin should be made as direct as practically possible for maximum device performance. The AAT2603 LDO regulators have been specifically designed to function with very low ESR ceramic capacitors. Although the device is intended to operate with these low ESR capacitors, it is stable over a very wide range of capacitor ESR, thus it will also work with higher ESR tantalum or aluminum electrolytic capacitors. However, for best performance, ceramic capacitors are recommended. Typical output capacitor values for maximum output current conditions range from 4.7F to 10F. If desired, COUTLX may be increased without limit.
CFF
VFBB1/VFBB2
R1
R2
Figure 1: AAT2603 DC-DC1/DC-DC2 External Resistor Output Voltage Programming. R2 = 59k R1 (k)
29.4 39.2 49.9 59.0 68.1 78.7 88.7 118 124 137 187 267
VOUT (V)
0.9 1.0 1.1 1.2 1.3 1.4 1.5 1.8 1.85 2.0 2.5 3.3
R2 = 221kW R1 (k)
113K 150K 187K 221K 261K 301K 332K 442K 464K 523K 715K 1.00M
Bypass Capacitor and Low Noise Applications
A bypass capacitor pin is provided to enhance the very low noise characteristics of the AAT2603 LDO3 and LDO4 regulators. The bypass capacitor is not necessary for operation of the AAT2603. However, for best device performance, a small ceramic capacitor should be placed between the bypass pin (BYP) and the device analog ground pin (AGND). The value of CBYP should be 10nF. For lowest noise and best possible power supply ripple rejection performance a 10nF capacitor should be used. To practically realize the highest power supply ripple rejection and lowest output noise performance, it is critical that the capacitor connection between the BYP pin and AGND pin be direct and PCB traces should be as short as possible. Refer to the PCB Layout Recommendations section of this datasheet for examples.
Table 4: Feedback Resistors for DC-DC1 and DC-DC2.
LDO1/LDO2/LDO3/LDO4
Input Capacitor
Typically, a 2.2F or larger capacitor is recommended for CINL12/CINL34/CAIN in most applications. The input capacitor should be located as close to the input (INL12/INL34/ AIN) of the device as practically possible. CINL12/CINL34/ CAIN values greater than 2.2F will offer superior input line transient response and will assist in maximizing the highest possible power supply ripple rejection.
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PRODUCT DATASHEET
AAT2603
R2 = 100k R1 (k)
8.25 16.5 24.9 33.2 41.2 49.9 59 66.5 75 82.5 90.9 100 107 118 124 133 140 150 158 165 174
Total Power Solution for Portable Applications
There is a relationship between the bypass capacitor value and the LDO regulator turn-on time. In applications where fast device turn-on time is desired, the value of CBYP should be reduced. In applications where low noise performance and/or ripple rejection are less of a concern, the bypass capacitor may be omitted. The fastest device turn-on time will be realized when no bypass capacitor is used. DC leakage on this pin can affect the LDO regulator output noise and voltage regulation performance. For this reason, the use of a low leakage, high quality ceramic (NPO or C0G type) or film capacitor is highly recommended. VOUT (V)
1.3 1.4 1.5 1.6 1.7 1.8 1.9 2 2.1 2.2 2.3 2.4 2.5 2.6 2.7 2.8 2.9 3 3.1 3.2 3.3
Feedback Resistor Selection
Resistors R1 and R2 of Figure 2 program the output to regulate at a voltage higher than 1.5V for LDO1/LDO2 and 1.2V for LDO3/LDO4. To limit the bias current required for the external feedback resistor string while maintaining good noise immunity, the minimum suggested value for R2 is 100k. Although a larger value will further reduce quiescent current, it will also increase the impedance of the feedback node, making it more sensitive to external noise and interference. Tables 5 and 6 summarize the resistor values for various output voltages with R2 set to 100k.
Table 5: Feedback Resistor Values for LDO3 and LDO4. R2 = 100k R1 (k)
24.9 33.2 41.2 49.9 59 66.5 75 82.5 90.9 100 107 118 124 133 140 150 158 165 174
1.5V VOUT R1 = V -1 * R2 = 1.2V - 1 * 100k = 24.9k REF
VOUTLX
VOUT (V)
1.5 1.6 1.7 1.8 1.9 2 2.1 2.2 2.3 2.4 2.5 2.6 2.7 2.8 2.9 3 3.1 3.2 3.3
R1
VFBLX
R2
Figure 2: AAT2603 LDO1/LDO2/LDO3/LDO4 External Resistor Output Voltage Programming.
Table 6: Feedback Resistor Values for LDO1 and LDO2.
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PRODUCT DATASHEET
AAT2603
Total Power Solution for Portable Applications
Thermal Calculations
There are three types of losses associated with the AAT2603 total power management solution [two stepdown and four LDO regulators]: switching losses, conduction losses, and quiescent current losses. Conduction losses are associated with the RDS(ON) characteristics of the internal power switches/FETs of both of the stepdown regulators and the power loss associated with the voltage difference across the pass switch/FET of the four LDO regulators. Switching losses are dominated by the gate charge of the power output switching devices. At full load, assuming continuous conduction mode (CCM), a simplified form of the losses is given by the following (quiescent and switching losses are ignored, since conduction losses are so dominant): Since RDS(ON) and conduction losses all vary with input voltage, the dominant losses should be investigated over the complete input voltage range. Given the total conduction losses, the maximum junction temperature (125C) can be derived from the JA for the TQFN44-28 package which is 50C/W.
TJ(MAX) = PTOTAL * JA + TA
TJ(MAX): PTOTAL: JA: TA: Maximum junction temperature Total conduction losses Thermal impedance of the package Ambient temperature
Layout
The suggested PCB layout for the AAT2603 is shown in Figures 4 and 5. The following guidelines should be used to help ensure a proper layout. 1. The input capacitors (C1, C2, C7, C13, and C16) should connect as closely as possible to INB1 (Pin 26), INB2 (Pin 27), AIN (Pin 20), INL12 (Pin 16), INL34 (Pin 8), and AGND/PGND1/PGND2 (Pins 5, 25, and 27). C3/C18 (step-down regulator output capacitors) and L1/L2 should be connected as closely as possible. The connection of L1/L2 to the LX1/LX2 pins should be as short as possible. The feedback trace or FBXX pin (Pins 3, 6, 10, 14, 18, and 21) should be separate from any power trace and connect as closely as possible to the load point. Sensing along a high current load trace will degrade DC load regulation. If external feedback resistors are used, they should be placed as closely as possible to the FBXX pin (Pins 3, 6, 10, 14, 18, and 21) to minimize the length of the high impedance feedback trace. The resistance of the trace from the load return to the PGND1/PGND2 (Pins 25 and 28) should be kept to a minimum. This will help to minimize any error in DC regulation due to differences in the potential of the internal signal ground and the power ground. For good thermal coupling, PCB vias are required from the pad for the TDFN44-28 exposed paddle to the ground plane.
PDC-DC1 =
IO12 * (RDS(ON)H1 * VOB1 + RDS(ON)L1 * [VINB1 - VOB1]) VINB1 IO22 * (RDS(ON)H2 * VOB2 + RDS(ON)L2 * [VINB2 - VOB2]) VINB2
PDC-DC2 =
PLDO1 = ILDO1 * (VINL12 - VOL1) PLDO2 = ILDO2 * (VINL12 - VOL2)
2.
3.
PLDO3 = ILDO3 * (VINL34 - VOL3) PLDO4 = ILDO4 * (VINL34 - VOL4) PTOTAL = PDC_DC1 + PDC_DC2 + PLDO1 + PLDO2 + PLDO3 + PLDO4
PDC-DCX: Power dissipation of the specific DC-DC regulator IOX: Output current of the specific DC-DC regulator RDS(ON)HX: Resistance of the internal high-side switch/FET RDS(ON)LX: Resistance of the internal low-side switch/FET VOBX: Output voltage of the specific DC-DC regulator VINBX: Input voltage of the specific DC-DC regulator PLDOX: Power dissipation of the specific LDO regulator ILDOX: Output current of the specific LDO regulator VINLXX: Input voltage of the specific LDO regulator VOLX: Output voltage of the specific LDO regulator PTOTAL: Total power dissipation of the AAT2603
4.
5.
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PRODUCT DATASHEET
AAT2603
Total Power Solution for Portable Applications
VIN
C2
1
C1 VIN L1 C18 OUTB1
J1 3-Prong Header
2
1
J2 3-Prong Header
2
ENL1
3
ENB1 GND SELB2 R1 ENB1 U1 AAT2603 C17
3
GND
27 INB2 26 28 PGND2
25 24 23 22
R2
LX1
PGND1
INB1
SELB2
ENB1
C3
1
L2
1 2 3 4 5
J3 3-Prong Header
2
1
J4 3-Prong Header
ENB2
OUTB2 ENB2 C4 ENL3 R12
LX2 ENB2 FBB2 ENL3 AGND FBL3 OUTL3
OUTL4 INL34 ENL4 FBL4 ENL1 FBL1 BYP
FBB1 AIN ENL2 FBL2 OUTL2 INL12 OUTL1
21 20
VIN ENL2
C16 R4 C15 R3 C14
ENL2
2
R11
19 18 17
3
3
OUTL2 C13
16 15
6 7
R9
1
VIN OUTL1 R5 C11 C12 GND
J5 3-Prong Header
2
1
J6 3-Prong Header ENL4 GND
R10
C5 OUTL3 C6 C7 VIN
10
11
12
13
14
8
9
ENL3
2
3
3
ENL1 C8 ENL4 C10 R6
OUTL4 R7
1
R8
J7 3-Prong Header
2
C9
SELB2
3
Figure 3: AAT2603 Evaluation Board Schematic.
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PRODUCT DATASHEET
AAT2603
Total Power Solution for Portable Applications
Figure 4: AAT2603 Evaluation Board Top Side PCB Layout.
Figure 5: AAT2603 Evaluation Board Bottom Side PCB Layout.
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PRODUCT DATASHEET
AAT2603
Total Power Solution for Portable Applications
Ordering Information
Output Voltage1 Package
TQFN44-28 TQFN44-28 TQFN44-28 DC-DC1 (Buck1) Ext. Adj. (VREF = 600mV) 3.3V Ext. Adj. (VREF = 600mV) DC-DC2 (Buck2) (SELB2 = Low) Ext. Adj. (VVREF = 600mV) 1.0V 1.0V DC-DC2 (Buck2) (SELB2 = High) Ext. Adj. (VVREF= 775mV) 1.3V 1.3V
Marking2
3AXYY
Part Number (Tape and Reel)3
AAT2603INJ-1-T1 AAT2603INJ-2-T1 AAT2603INJ-3-T1
All AnalogicTech products are offered in Pb-free packaging. The term "Pb-free" means semiconductor products that are in compliance with current RoHS standards, including the requirement that lead not exceed 0.1% by weight in homogeneous materials. For more information, please visit our website at http://www.analogictech.com/about/quality.aspx.
1. Buck 1 and Buck 2 output voltages can be factory programmed to most common output voltages. Contact your local sales representative for availability and minimum order quantities. 2. XYY = assembly and date code. 3. Sample stock is generally held on part numbers listed in BOLD.
2603.2008.06.1.0
www.analogictech.com
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PRODUCT DATASHEET
AAT2603
Total Power Solution for Portable Applications
Package Information
TQFN44-28
Pin 1 Dot by Marking Detail "A" 2.600 0.050 C0.3
4.000 0.050
4.000 0.050
2.600 0.050
Top View
Bottom View
0.400 0.050
0.430 0.050
0.750 0.050 0.230 0.050 0.203 REF 0.050 0.050
Side View
Pin 1 Indicator
Detail "A"
1. The leadless package family, which includes QFN, TQFN, DFN, TDFN and STDFN, has exposed copper (unplated) at the end of the lead terminals due to the manufacturing process. A solder fillet at the exposed copper edge cannot be guaranteed and is not required to ensure a proper bottom solder connection.
Advanced Analogic Technologies, Inc. 3230 Scott Boulevard, Santa Clara, CA 95054 Phone (408) 737-4600 Fax (408) 737-4611
(c) Advanced Analogic Technologies, Inc. AnalogicTech cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in an AnalogicTech product. No circuit patent licenses, copyrights, mask work rights, or other intellectual property rights are implied. AnalogicTech reserves the right to make changes to their products or specifications or to discontinue any product or service without notice. Except as provided in AnalogicTech's terms and conditions of sale, AnalogicTech assumes no liability whatsoever, and AnalogicTech disclaims any express or implied warranty relating to the sale and/or use of AnalogicTech products including liability or warranties relating to fitness for a particular purpose, merchantability, or infringement of any patent, copyright or other intellectual property right. In order to minimize risks associated with the customer's applications, adequate design and operating safeguards must be provided by the customer to minimize inherent or procedural hazards. Testing and other quality control techniques are utilized to the extent AnalogicTech deems necessary to support this warranty. Specific testing of all parameters of each device is not necessarily performed. AnalogicTech and the AnalogicTech logo are trademarks of Advanced Analogic Technologies Incorporated. All other brand and product names appearing in this document are registered trademarks or trademarks of their respective holders.
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www.analogictech.com
2603.2008.06.1.0

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