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1MHz 1A Synchronous Buck DC/DC Converter General Description
The AAT1150 SwitchRegTM is a member of AnalogicTechTM's Total Power ManagementTM IC product family. The step-down switching converter is ideal for applications where high efficiency, small size, and low ripple are critical. Able to deliver 1A with internal Power MOSFETs, the current-mode controlled IC provides high efficiency using synchronous rectification. Fully internally compensated, the AAT1150 simplifies system design and lowers external part count. The AAT1150 is available in MSOP-8 package, rated over -40 to 85C.
AAT1150
Features
* * * * * * * * * * * * * * * * *
SwitchRegTM
VIN Range: 2.7 - 5.5 Volts Up to 95% efficiency 110 m RDS(ON) MOSFET switch < 1.0 A of Shutdown Current 1 MHz Switching Frequency Fixed or adjustable VOUT: 1.0 - 4.2 V High initial accuracy: 1% 1.0 Amp Peak Current Integrated Power Switches Synchronous rectification Internally Compensated Current Mode Control Constant PWM Mode for low output ripple Internal Soft Start Current Limit Protection Over-Temperature Protection MSOP-8 package -40 To +85C Temperature Range
Applications
* * * * * Computer Peripherals Set Top Boxes Network Cards Cable/DSL Modems High efficiency conversion from 5V or 3.3V supply
Typical Application
INPUT
10F
VP FB
AAT1150
LX ENABLE 100 VCC
4.1H
OUTPUT SGND 0.1F PGND 2x 22F
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1MHz 1A Synchronous Buck DC/DC Converter Pin Descriptions
Pin #
1 2 3 4 5 6,7
AAT1150
Symbol
FB SGND EN VCC VP LX
Function
Feedback input pin. This pin must be connected to the converter's output. It is used to set the output of the converter to regulate to the desired value. Signal ground. Enable input pin. When connected high, AAT1150 is in normal operation. When connected low, it is powered down. This pin should not be left floating. Power supply. It supplies power for the internal circuitry. Input Supply Voltage for converter power stage. Inductor connection pins. These pins should be connected to the output inductor. Internally, pins 6 & 7 are connected to the drains of the P-channel switch and N-channel synchronous rectifier. Power ground return for the output stage.
8
PGND
Pin Configuration
MSOP-8 (Top view)
FB SGND EN VCC
1
8
PGND LX LX VP
1
2 2
7
3
6
4
5
2
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1MHz 1A Synchronous Buck DC/DC Converter Absolute Maximum Ratings
Symbol
VCC, VP VLX VFB VEN TJ VESD
AAT1150
(TA=25C unless otherwise noted) Value
6 -0.3 to VP+0.3 -0.3 to VCC+0.3 -0.3 to 6 -40 to 150 3000
Description
VCC, VP to GND LX to GND FB to GND EN to GND Operating Junction Temperature Range ESD Rating 1 - HBM
Units
V V V V C V
Note: 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. Note 1: Human body model is a 100pF capacitor discharged through a 1.5K resistor into each pin.
Thermal Characteristics
Symbol
JA PD
Description
Maximum Thermal Resistance (MSOP-8) 2 Maximum Power Dissipation (MSOP-8, TA = 25C)
2, 3
Value
150 667
Units
C/W mW
Note 2: Mounted on a demo board. Note 3: Derate 6.7mW/C above 25C.
Recommended Operating Conditions
Symbol
T
Description
Ambient Temperature Range
Rating
-40 to +85
Units
C
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1MHz 1A Synchronous Buck DC/DC Converter Electrical Characteristics
values are at TA = 25C) Symbol
VIN VOUT
AAT1150
(VIN = VCC = VP = 5V, TA= -40 to 85C unless otherwise noted. Typical
Description
Input Voltage Range Output Voltage Tolerance
Conditions
VIN = VOUT + 0.3 to 5.5V, IOUT = 0 to 1A VIN= 4.2V, ILOAD = 0 - 1A VIN= 2.7 to 5.5V VIN Rising VIN Falling No Load, VFB= 0 VEN = 0V, VIN= 5.5V TA = 25C TA = 25C TA = 25C VIN= 5V, VOUT = 3.3V, IOUT = 600mA VIN = 2.7 to 5.5V VIN = 2.7 to 5.5V VEN = 5.5V TA = 25C
Min
2.7 -4.0
Typ
Max
5.5 4.0
Units
V % % %/V V V mV A A A m m % V V A KHz C C
VOUT (VOUT*VIN) Load Regulation VOUT/VOUT Line Regulation VUVLO VUVLO(HYS) IQ ISHDN ILIM RDS(ON)H RDS(ON)L VEN(L) VEN(H) IEN FOSC TSD THYS Under Voltage Lockout Under Voltage Lockout Hysteresis Quiescent Supply Current Shutdown Current Current Limit High Side Switch On Resistance Low Side Switch On Resistance Efficiency Enable Low Voltage Enable High Voltage Enable Pin Leakage Current Oscillator Frequency Over Temp Shutdown Threshold Over Temp Shutdown Hysteresis
3.0 0.2 2.5 1.2 250 160 1.2 110 100 93 150 150 300 1.0
0.6 1.4 700 1000 140 15 1.0 1200
4
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1MHz 1A Synchronous Buck DC/DC Converter Typical Characteristics
High Side RDS(ON) vs. Temperature
170 150 170
AAT1150
Low Side RDS(ON) vs. Temperature
3.6V RDS(ON) (m) 2.7V
150 130 110 90 70 -20
RDS(ON) (m)
130 110 90 70 -20
3.6V 2.7V 5.5V 4.2V
0 20 40 60 80 100 120
4.2V
5.5V
0
20
40
60
80
100
120
Temperature (C)
Temperature (C)
RDS(ON) vs. Input Voltage
130 1.2 120
Enable Threshold vs. Input Voltage
Enable Threshold (V)
High Side RDS(ON) (m)
110 100
1.1
VEN(H)
1
0.9 0.8
90 80 2.5 3 3.5 4
Low Side
VEN(L)
4.5
5
5.5
0.7 2.5 3 3.5 4 4.5 5 5.5
Input Voltage (V)
Input Voltage (V)
Oscillator Frequency Variation vs. Supply Voltage
3.5 2.5
Oscillator Frequency Variation vs. Temperature VIN=3.6V
10 6
Variation (%)
1.5 0.5 -0.5 -1.5 2.5 3 3.5 4 4.5 5 5.5
Variation (%)
2 -2 -6 -10 -20
0
20
40
60
80
100
Supply Voltage (V)
Temperature (C)
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1MHz 1A Synchronous Buck DC/DC Converter Typical Characteristics
Output Voltage vs. Temperature IOUT=900mA, VOUT=1.5V
Output Voltage Error (%)
1.0 0.6 0.2 -0.2 -0.6 -1.0 -20
AAT1150
Line Regulation VOUT=1.5V
0.25 0.15
VIN = 2.7V
Accuracy (%)
IOUT = 1.0A
0.05 -0.05 -0.15 -0.25
VIN = 3.6V
IOUT = 0.4A
0
20
40
60
80
100
2.5
3
3.5
4
4.5
5
5.5
Temperature (C)
Input Voltage (V)
Load Regulation VOUT= 1.5V, VIN=3.6V
0 -1 0 -1
Load Regulation VOUT=3.3V, VIN=5.0V
VOUT Error (%)
Error (%)
-2 -3 -4 -5 0 150 300 450 600 750 900
-2 -3 -4 -5 0 150 300 450 600 750 900 1050
IOUT (mA)
Output Current (mA)
Efficiency vs. Input Voltage VOUT=1.5V
100
Loop Gain and Phase vs. Output Capacitor VIN = 3.6V, IOUT = 0.3A, CO = 22F
40 225 180 90 45
2x 2x
IO = 1A
90
32 24
16
Gain (dB)
80 70 60 50 2.5 3 3.5
IO = 0.4A
4x
8 0 -8
-16
3x
0 -45 -90 -135 -180 -225 1000
-24 -32 -40
4 4.5 5 5.5
Gain
3x 4x
10
100
Input Voltage (V)
Frequency (kHz)
6
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Phase (degrees)
Efficiency (%)
Phase
135
1MHz 1A Synchronous Buck DC/DC Converter Typical Characteristics
No Load Input Current vs. Temperature VCC = VP
12
AAT1150
Non-Switching IQ vs. Temperature FB = 0V, VP = VCC
Operating Current (A)
200 190 180 170 160 150 140 130 120 110 100 -20 -5
VCC = 5.5V
VCC = 5.0V
Input Current (mA)
10 8 6 4 2 0 -20 -5 10 25 40 55 70 85
VCC = 5.5V VCC = 5.0V VCC = 4.2V VCC = 2.7V
10 25
VCC = 4.2V
VCC = 3.6V
VCC = 2.7V
VCC = 3.6V
40
55
70
85
Temperature (C)
Temperature (C)
Switching Waveform
VOUT 50mV/div V(LX) 2V/div Inductor Current 500mA/div
Transient Response
IL 500mA/div
VIN=3.6V VOUT=1.5V IOUT=1.2A
VIN=3.6V VOUT=1.5V ILOAD=0.25 to 1.2A 500nsec/div 20s/div
Output Ripple 1.5V, No Load
VOUT 5mV/div BW=20MHz VIN=3.6V VOUT=1.5V IOUT=0A LX 2V/div 500nsec/div VOUT 5mV/div BW=20MHz VIN=3.6V VOUT=1.5V IOUT=1A LX 2V/div
Output Ripple 1.5V, 1A Load
500nsec/div
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1MHz 1A Synchronous Buck DC/DC Converter Typical Characteristics
Output Ripple 3.3V, No Load
VOUT 5mV/div BW=20MHz VIN=5.0V VOUT=3.3V IOUT=0A LX 2V/div 500nsec/div VOUT 5mV/div BW=20MHz VIN=5.0V VOUT=3.3V IOUT=1A LX 2V/div 500nsec/div
AAT1150
Output Ripple 3.3V, 1A Load
8
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1MHz 1A Synchronous Buck DC/DC Converter Functional Block Diagram
VCC VP= 2.7V- 5.5V
AAT1150
1.0V REF
FB
OP. AMP
CMP
DH
LOGIC
LX
1M
DL Temp. Sensing
OSC
SGND
EN
PGND
Applications Information
850 kHz 1 Amp DC-DC Synchronous Buck Converter Control Loop
The AAT1150 is a peak current mode buck converter. The inner wide bandwidth loop controls the peak current of the output inductor. The output inductor current is sensed through the P-Channel MOSFET (high side) and is also used for short circuit and overload protection. A fixed slope compensation signal is added to the sensed current to maintain stability. The loop appears as a voltage programmed current source in parallel with the output capacitor. The voltage error amplifier output programs the current loop for the necessary inductor current to
force a constant output voltage for all load and line conditions. The feedback resistive divider is internal, dividing the output voltage to the error amplifier reference voltage of 1.0V. The error amplifier does not have a large DC gain typical of most error amplifiers. This eliminates the need for external compensation components while still providing sufficient DC loop gain for load regulation. The crossover frequency and phase margin are set by the output capacitor value only.
Soft-Start/Enable
Soft start increases the inductor current limit point in discrete steps when the input voltage or enable input is applied. It limits the current surge seen at the input and eliminates output voltage overshoot. The enable input, when pulled low, forces the AAT1150 into a low power non-switching state. The total input current during shutdown is less that 1A.
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1MHz 1A Synchronous Buck DC/DC Converter
AAT1150
Enable 2V/div
VOUT 1V/div IL 0.5A/div VIN=3.6V VOUT=1.5V IL=1A
200sec/div
Figure 1: Inrush Limit
Power and Signal Source
Separate small signal ground and power supply pins isolate the internal control circuitry from the noise associated with the output MOSFET switching. The low pass filter R1 and C3 in schematic figures 3 and 4 filters the noise associated with the power switching.
Current Limit and Over-temperature protection
For overload conditions the peak input current is limited. Figure 2 displays the VI current limit characteristics. As load impedance decreases and the output voltage falls closer to zero, more power is dissipated internally, raising the device temperature. Thermal protection completely disables switching when internal dissipation becomes excessive, protecting the device from damage. The junction over-temperature threshold is 140C with 15C of hysteresis.
Current Limit Characteristic
3.5 3 2.5
VCC =VP = 5.0V VO = 3.3V Figure 4 schematic
VOUT (V)
2 1.5 1 0.5 0 0 0.5 1 1.5 2 2.5
VCC =VP =3.6V VO = 1.5V Figure 3 schematic
IOUT (A)
Figure 2.
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1150.2004.08.1.1
1MHz 1A Synchronous Buck DC/DC Converter
Inductor
The output inductor is selected to limit the ripple current to some predetermined value, typically 2040% of the full load current at the maximum input voltage. 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 all normal load conditions. During over load and short circuit conditions, the average current in the inductor can meet or exceed the ILIMIT point of the AAT1150 without effecting the converter performance. Some inductors may have sufficient 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. For a 1 Amp load and the ripple set to 30% at the maximum input voltage, the maximum peak to peak ripple current is 300 mA. The inductance value required is 3.9H. V VOUT 1 - OUT IO k F VIN 1.5V 1.5V 11.0A 0.3 830kHz 4.2V
AAT1150
I is the peak to peak ripple current which is fixed by the inductor selection above. For a peak to peak current of 30% of the full load current the peak current at full load will be 115% of the full load. The 4.1H inductor selected from the Sumida CDRH5D18 series has a 57 m DCR and a 1.95 Amp DC current rating. At full load the inductor DC loss is 57mW which amounts to a 3.8% loss in efficiency.
Input Capacitor
The primary function of the input capacitor is to provide a low impedance loop for the edges of pulsed current drawn by the AAT1150. A low ESR/ESL ceramic capacitor is ideal for this function. To minimize the stray inductance the capacitor should be placed as close as possible to the IC. This keeps the high frequency content of the input current localized, minimizing radiated and conducted EMI while facilitating optimum performance of the AAT1150. Ceramic X5R or X7R capacitors are ideal for this function. The size required will vary depending on the load, output voltage and input voltage source impedance characteristics. A typical value is around 10F. The input capacitor RMS current varies with the input voltage and the output voltage. The equation for the RMS current in the input capacitor is:
L= L=
IRMS = IO
L = 3.9H
The factor "k" is the fraction of full load selected for the ripple current at the maximum input voltage. The corresponding inductor rms current is: IRMS = 2 I2 Io = 1.0A I+ o 12
VO VO 1VIN VIN
The input capacitor RMS ripple current reaches a maximum when VIN is two times the output voltage where it is approximately one half of the load current. Losses associated with the input ceramic capacitor are typically minimal and not an issue. The proper placement of the input capacitor can be seen in the reference design layout in figures 6 and 7.
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1MHz 1A Synchronous Buck DC/DC Converter
2.7V-5.5V R1 100 R2 C1 10F 100k C3 0.1 F AAT1150-1.5 Vp Vcc EN FB LX LX L1 4.1H Vout 1.5V 1A
AAT1150
C2, C4 2x 22F
Sgnd Pgnd
rtn C1 Murata 10F 6.3V X5R GRM42-6X 5R106K6.3 C2, C4 MuRata 22F 6.3V GRM21BR60J226ME39L 0805 X5R L1 Sumida CDRH5D18-4R 1H
1.5V Efficiency vs. IOUT
100 80
2.7V
Efficiency (%)
60
4.2V
40 20 0 10 100 1000
3.6V
Iout (mA)
Figure 3: Lithium-Ion to 1.5V converter
Output Capacitor
Since there are no external compensation components, the output capacitor has a strong effect on loop stability. Larger output capacitance will reduce the crossover frequency with greater phase margin. For the 1.5V 1A design using the 4.1 H inductor, two 22F capacitors provide a stable output. In addition to assisting stability, the output capacitor limits the output ripple and provides holdup during large load transitions.
The output capacitor rms ripple current is given by:
1 2 3 VOUT (VIN - VOUT) L F VIN
IRMS =
For a ceramic capacitor the dissipation due to the RMS current of the capacitor is not a concern. Tantalum capacitors, with sufficiently low ESR to meet output voltage ripple requirements, also have an RMS current rating much greater than that actually seen in this application.
12
1150.2004.08.1.1
1MHz 1A Synchronous Buck DC/DC Converter
AAT1150
3.5V-5.5V R1 100 R2 C1 10F 100k C3 0.1F
AAT1150-3.3 Vp Vcc EN FB LX LX
Vout 3.3V1A
L1 4.1H
C2, C4 2x 22F
Sgnd Pgnd
rtn C1 Murata 10F 6.3V X5R GRM42-6X 5R106K6.3 C2, C4 MuRata 22F 6.3V GRM21BR60J226ME39L X5R 0805 L1 Sumida CDRH5D18-4R 1H
3.3 Volt Efficiency vs. IOUT
100 90 80
VIN = 5.0V
Efficiency (%)
70 60 50 40 30 20 10 0 10 100 1000
IOUT (mA)
Figure 4: 5V Input to 3.3V Output Converter
Adjustable Output
For applications requiring an output other than the fixed outputs available, the 1V version can be programmed externally (see Figure 5). Resistors R3 and R4 force the output to regulate higher than 1 Volt. R4 should be 100 times less than the internal
1 MegOhm resistance of the FB pin. Once R4 is selected R3 can be calculated. For a 1.25V output with R4 set to 10k, R3 is 2.55k.
R3 = (VO - 1) R4 = 0.25 10.0k = 2.55k
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1MHz 1A Synchronous Buck DC/DC Converter
Vin+ 3.3V R1 100 R2 C1 10F 100k C3 0.1F EN AAT1150-1.0 Vp Vcc EN LX LX FB R4 10k 1% L1 2.7H C2, C4 2x 22F R3 2.55k 1% Vo+ 1.25V1A
AAT1150
Sgnd Pgnd
VC1 Murata 10F 6.3V X5R GRM42-6X 5R106K6.3 C2, C4 MuRata 22F 6.3V GRM21BR60J226ME39L X5R 0805 L1 Sumida CDRH4D28-2R7H
Figure 5: 3.3V to 1.25V converter (Adjustable output)
Figure 6: AAT1150 Layout Top Layer
Figure 7: AAT1150 Layout Bottom Layer
Layout Considerations
Figures 6 and 7 display the suggested PCB layout for the AAT1150. The most critical aspect of the layout is the placement of the input capacitor C1. For proper operation C1 must be placed as close as possible to the AAT1150.
Thermal Calculations
There are two types of losses associated with the AAT1150 output switching MOSFET, switching losses and conduction losses. The conduction losses are associated with the RDS(ON) characteristics of the output switching device. At full load, assuming continuous conduction mode (CCM), a simplified form of the total losses is:
PLOSS =
IO2 (RDSON(H) VO + RDSON(L) (VIN - VO)) + tsw F IO VIN + IQ VIN VIN
Once the total losses have been determined the junction temperature can be derived from the JA for the MSOP-8 package.
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1150.2004.08.1.1
1MHz 1A Synchronous Buck DC/DC Converter
Design Example
Specifications IOUT = 1.0A IRIPPLE = 30% of full load at max VIN VOUT = 1.5V VIN = 2.7 - 4.2 V (3.6V nominal) Fs = 830 kHz
AAT1150
Maximum Input Capacitor Ripple:
IRMS = IO VO VO IO 1= = 0.5ARMS, VIN = 2 x VO VIN VIN 2
P = ESRCOUT IRMS2 = 5m 0.52 A = 1.25mW
Inductor Selection:
L=
V VOUT 1.5V 1.5V 1 - OUT = 1= 3.9H IO k F VIN 1.0A 0.3 830kHz 4.2V
Select Sumida inductor CDRH5D18 4.1H 57m 2.0 mm height.
I =
1.5V VO V 1.5V 1- O = 1= 280mA L F VIN 4.1H 830kHz 4.2V
IPK = IOUT +
I = 1.0A + 0.14A = 1.14A 2
P = IO2 DCR =57mW
Output Capacitor Dissipation:
IRMS = VOUT (VIN - VOUT) 1.5V (4.2V - 1.5V) 1 1 = =82mARMS L F VIN 2 3 2 3 4.1H 830kHz 4.2V
PESR = ESRCOUT IRMS2 = 5m .0822 A = 33W
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1MHz 1A Synchronous Buck DC/DC Converter
AAT1150 Dissipation:
P= IO2 * (RDSON(H) * VO + RDSON(L) * (VIN -VO)) VIN + (tsw * F * IO + IQ) * VIN
AAT1150
=
(0.14 * 1.5V + 0.145 * (3.6V - 1.5V)) 3.6V
+ (20nsec * 830kHz * 1.0A + 0.3mA) * 3.6V = 0.203W
TJ(MAX) = TAMB + JA * PLOSS = 85C + 150C/W * 0.203W = 115C
Table 1: Surface Mount Inductors
Manufacturer
TaiyoYuden Toko Sumida Sumida MuRata MuRata
Part Number
NPO5DB4R7M A914BYW-3R5M-D52LC CDRH5D28-4R2 CDRH5D18-4R1 LQH55DN4R7M03 LQH66SN4R7M03
Value
4.7H 3.5H 4.2H 4.1H 4.7H 4.7H
Max DC Current
1.4A 1.34A 2.2A 1.95A 2.7A 2.2A
DCR
.038 .073 .031 .057 .041 .025
Size (mm) LxWxH 5.9 x 6.1 x 2.8 5.0 x 5.0 x 2.0 5.7 x 5.7 x 3.0 5.7 x 5.7 x 2.0 5.0 x 5.0 x 4.7 6.3 x 6.3 x 4.7
Type
Shielded Shielded Shielded Shielded Non-shielded Shielded
Table 2: Surface Mount Capacitors
Manufacturer
MuRata MuRata MuRata MuRata
Part Number
GRM40 X5R 106K 6.3 GRM42-6 X5R 106K 6.3 GRM21BR60J226ME39L GRM21BR60J106ME39L
Value
10F 10F 22F 10F
Voltage
6.3V 6.3V 6.3V 6.3V
Temp. Co.
X5R X5R X5R X5R
Case
0805 1206 0805 0805
16
1150.2004.08.1.1
1MHz 1A Synchronous Buck DC/DC Converter Ordering Information
Output Voltage 1.0V (Adj VOUT 1.0V) 1.5V 1.8V 2.5V 3.3V Package MSOP-8 MSOP-8 MSOP-8 MSOP-8 MSOP-8 Marking1 JZXYY HYXYY KAXYY KCXYY HZXYY Part Number (Tape and Reel) AAT1150IKS-1.0-T1 AAT1150IKS-1.5-T1 AAT1150IKS-1.8-T1 AAT1150IKS-2.5-T1 AAT1150IKS-3.3-T1
AAT1150
Note: Sample stock is held on part numbers listed in bold. Contact local sales office for custom options. Note 1: XYY = assembly and date code.
Package Information
MSOP-8
4 4 1.95 BSC
3.00 0.10
4.90 0.10
0.60 0.20 PIN 1 0.254 BSC 0.95 REF
3.00 0.10 10 5 0.95 0.15 0.85 0.10
0.075 0.075 0.65 BSC 0.30 0.08
All dimensions in millimeters.
GAUGE PLANE
0.155 0.075
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1MHz 1A Synchronous Buck DC/DC Converter
AAT1150
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, and advise customers to obtain the latest version of relevant information to verify, before placing orders, that information being relied on is current and complete. All products are sold subject to the terms and conditions of sale supplied at the time of order acknowledgement, including those pertaining to warranty, patent infringement, and limitation of liability. AnalogicTech warrants performance of its semiconductor products to the specifications applicable at the time of sale in accordance with AnalogicTech's standard warranty. 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.
Advanced Analogic Technologies, Inc.
830 E. Arques Avenue, Sunnyvale, CA 94085 Phone (408) 737-4600 Fax (408) 737-4611 18
1150.2004.08.1.1

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