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Versatile 6 Regulator Power Management Circuit for Cellular Subscriber Terminal
The MC33283 is a complete power management solution for portable devices such as telephone handsets, two-way radios, etc. Thanks to its large scale integration, the device offers up to seven Low DropOut regulators (LDO), two of them delivering a voltage higher than the battery's. Despite the presence of an internal charge pump, the overall noise specification makes the circuit an ideal candidate where noise is an important feature. Outputs deliver 40VRMS typical (10-100kHz) at nominal output current. With a 50dB ripple rejection under 10kHz, the circuit naturally shields the downstream electronics against DC choppy lines. This parameter guarantees a clean operation for battery operated devices. Finally, housed in a compact Thin Quad Flat Pack TQFP-32 package, the MC33283 gathers all the features necessary to power future portable radios. Features:
MC33283
POWER MANAGEMENT CIRCUIT FOR PORTABLE DEVICES
SILICON MONOLITHIC INTEGRATED CIRCUIT
*
* * * * * * * *
6 regulated outputs: 2.85V, four outputs: 10-135mA 4.75V @ 15mA 5.0V @ 20mA Low-noise: 40VRMS at nominal output levels (10Hz-100kHz) Ultra-low reverse current in OFF mode (200nA typical) Two-mode regulator: output 5 switches from 3 to 5V with SEL pin activated Thermal shutdown for a rugged and reliable operation All outputs are short-circuit proof
32
1
FTB SUFFIX PLASTIC PACKAGE CASE 873B-02 (TQFP-32)
PIN CONNECTIONS
ENRS CBYP OUT1 VCC2 GND GND 24 GND 23 POR 22 UVLO2 21 EN3 20 EN5 19 EN6 18 SEL 17 GND 9 10 11 12 13 14 15 16 VS1IN B1 GND OUT6 GND Package TQFP32
Rev 1, 08/1999
EN7 VIN
All Portable radios (GSM etc.) Bursting systems (TDMA etc.) Battery operated devices
GND 1 OUT7 2 OUT2 3 OUT3 4 VCC1 5 OUT5 6 GND_CP 7 GND 8
32 31 30 29 28 27 26 25
MC33283
BUB
(Top View)
ORDERING INFORMATION
Device MC33283FTB28,R2
(c) Motorola, Inc. 1999
Temperature Range -20C to +70C
D1
EN2
Applications:
MOTOROLA DEVICE DATA
1
MC33283
Simplified Block Diagram
VCC2 29 VCC1 5
VCC2 VR1 5 mA
VCC1 12 700 k VR1 VCC1 UVLO2 UVLO1 UVLO1 2 mA Vref R1 VCC1 REFERENCE VOLTAGE ON/OFF2 Vref 3 31 OUT1 BUB
POR
23
VR1
UVLO2
22
Vref
R2 VCC1
OUT2
CBYP
26 HIGH = UVLO ACTIVE OUT5 VOLTAGE SELECTION 28 Vref 21 20 19 30 VCC2 ENABLE SWITCHES VCC2 ON/OFF2 ON/OFF3 ON/OFF4 ON/OFF5 ON/OFF6 ON/ OFF5 R5A
ENRS
27
ON/OFF3 Vref
R3
4
OUT3
EN2 EN3 EN5 EN6 EN7
VCC1 Vref
6
OUT5
R5B
SEL
18
ON/OFF6 Vref
R6 VCC1
10
OUT6
OVLO VCC2 6.5 V
ON/OFF7 Vref
R7
2
OUT7
OVLO VS 1 IN 14 VCC_CP
CP ENABLE VCC2
CHARGE PUMP
13 D1
15 B1
7 GND CP
14 Vin
1 GND
2
MOTOROLA DEVICE DATA
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PIN FUNCTION DESCRIPTIONS
Pin # 32 31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 10 11 9 8 7 6 5 4 3 2 1 Pin Name GND_CP UVLO2 VS1IN ENRS CBYP OUT1 VCC2 OUT6 OUT5 VCC1 OUT3 OUT2 OUT7 GND GND GND GND GND GND GND GND POR BUB EN7 EN2 EN3 EN5 EN6 SEL VIN D1 B1 Input Output O O O O O O O O O O I I I I I I I I I I I I I I I I I I I I I I Under voltage detection Charge pump ground Charge Pump output Supplies the 5V reg. Charge Pump VCC Output 1 regulator Output 6 regulator Output 5 regulator Output 3 regulator Output 2 regulator Output 7 regulator Bypass Capacitor IC supply voltage IC supply voltage Backup battery buffer output Activates Out 7 Activates Out 2 Activates Out 3 Activates Out 5 Activates Out 6 Grounds the IC Grounds the IC Grounds the IC Grounds the IC Grounds the IC Grounds the IC Grounds the IC Grounds the IC Toggles Out 5 Boost voltage Reset Enable Reset signal Function
MOTOROLA DEVICE DATA
MC33283
Output 6 delivers up to 50mA
Switches ON or OFF Out 7
Should be connected to pin 5 for normal use
Switches ON or OFF Out 2
A logic high prevents Out 2, 3, 5, 6 and 7 from being switched off by UVLO2
Bypasses the internal bandgap
Goes high during the Power-on sequence
Delivers a level low to warn of a low battery condition
Switches ON or OFF Out 3
Switches ON or OFF Out 5
Switches ON or OFF Out 6
The pin activates Out 5 either as a 4.75V or a 2.85V
Part of the charge pump wiring diagram
Supplies the charge pump seperately
D1 delivers a square-wave from the Charge Pump output
This pin is able to drive an external transistor to active a backup battery
This pin injects the charge-pump output to feed the 5V LDOs
Output 6 delivers up to 20mA
This pin requires proper grounding to keep switching noise at the lowest level
Output 5 delivers either 2.85V or 4.75V, depending on the level applied on pin 18
This pin supplies the 2.85/3V LDOs
Output 3 delivers up to 135mA
Output 2 delivers up to 120mA
Output 7 delivers up to 50mA
Description
3
MC33283
MAXIMUM RATINGS
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Supply Voltage (@ battery pins) Logic Input Voltage 5-29 Vin -0.3 -0.3 13 V V A A Vlogic Ilogic Vin Logic Output Current Internally limited Internally limited 80 typical Peak Output Current (each regulator) Thermal Resistance Junction-to-Air Operating Ambient Temperature Ipeak RqJA TA TJ C/W C C C C -20 +70 150 Maximum Operating Junction Temperature Storage Temperature Range Lead Temperature Tstg -30 +85 230 for 10s NOTES: 1. Stresses beyond those listed under "absolute maximum ratings" may cause permanent damage to the device. See "Recommended operating conditions" for functional operation of the device. The device may not operate under these conditions but will not be destroyed. 2. All voltages are with respect to GND.
Rating
Pin #
Symbol
Min
Max
Unit
RECOMMENDED OPERATING CONDITIONS
Characteristics Supply Voltage (Vcc1) Supply Voltage (Vcc2) Pin # 5 29 14 Symbol Vcc1 Vcc2 Min 3.13 0 Typ - - - - Max 6.5 6.5 6.5 Unit V V V
Supply Voltage (VS1IN)
VS1IN
3.13 -20
Operating free-air temperature
+70
C
DEVICE MARKING
Line 1
(M)
Line 2 Line 3 Line 4
MC33283F TB28
Date and traceability code
4
MOTOROLA DEVICE DATA
MC33283
REGULATOR R1
ELECTRICAL CHARACTERISTICS (For typical values TA = 25C, for min/max values TA = -40C to +85C/ Max TJ = 125C unless
otherwise noted) Characteristics Output Voltage Test Conditions 3.13V < Vcc1 < 6.5V Min 2.70 Typ 2.85 Max 3.00 Unit V Notes Limits apply over all normal operating conditions, except load transient response
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Line Regulation 1Vpp @ Iout = 11mA 0mA < Iout < 50mA 1.0 12 60 50 45 10 25 mV mV dB Load Regulation PSRR 1V pk-pk, Iout = 11mA 0kHz < f < 3kHz 3kHz < f < 8kHz 8kHz < f < 10kHz ON, Iout = 50mA ON, Iout = 50A 75 Vbackup = 2.85V 10Hz - 100kHz, Iout = 11mA 3.0V > Vout > 2.7V, Iout = 50mA 50 40 35 EN2-EN7 disabled, Vcc2 connected Quiescent current (ground current) Short circuit current Reverse output current Integrated RMS Noise Settling time 2.0 270 100 0.2 40 0.1 5.0 3.0 330 mA A mA A V ms Vcc (1&2) 0 to 3.13V (battery connected) R1 disabled The regulator must function normally under the following conditions: Load current Output capacitor Capacitor ESR 0 0.8 0.01 1.0 0.1 1.0 50 mA F Ceramic
W
MOTOROLA DEVICE DATA
5
MC33283
REGULATOR R2
ELECTRICAL CHARACTERISTICS (For typical values TA = 25C, for min/max values TA = -40C to +85C/ Max TJ = 125C unless
otherwise noted) Characteristics Output Voltage Test Conditions 3.13V < Vcc1 < 6.5V Min 2.70 Typ 2.85 Max 3.00 Unit V Notes Limits apply over all normal operating conditions, except load transient response
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Line Regulation 1Vpp @ Iout = 75mA 0mA < Iout < 100mA 0.5 3.0 60 50 45 10 12 mV mV dB Load Regulation PSRR 1V pk-pk, Iout = 75mA 0kHz < f < 3kHz 3kHz < f < 8kHz 8kHz < f < 10kHz ON, Iout = 120mA ON, Iout = 100A 180 10Hz - 100kHz, Iout = 75mA 3.0V > Vout > 2.7V, Iout = 120mA 50 40 35 EN2-EN7 disabled, Vcc2 connected Quiescent current (ground current) Short circuit current Integrated RMS Noise Settling time 4.5 70 250 40 0.1 6.5 120 mA A mA V ms Von/off 0 to 2.4V (regulated enabled) The regulator must function normally under the following conditions: Load current Output capacitor Capacitor ESR 0 0.8 0.01 1.0 0.1 1.0 120 mA F Ceramic
W
6
MOTOROLA DEVICE DATA
MC33283
REGULATOR R3
ELECTRICAL CHARACTERISTICS (For typical values TA = 25C, for min/max values TA = -40C to +85C/ Max TJ = 125C unless
otherwise noted) Characteristics Output Voltage Test Conditions 3.13V < Vcc1 < 6.5V Min 2.70 Typ 2.85 Max 3.00 Unit V Notes Limits apply over all normal operating conditions, except load transient response
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Line Regulation 1Vpp @ Iout = 82mA 0mA < Iout < 135mA 0.3 3.0 60 50 45 10 mV mV dB Load Regulation PSRR 13.5 1V pk-pk, Iout = 11mA 0kHz < f < 3kHz 3kHz < f < 8kHz 8kHz < f < 10kHz ON, Iout = 50mA ON, Iout = 10A 203 10Hz - 100kHz, Iout = 79mA 3.0V > Vout > 2.7V, Iout = 135mA 50 40 35 EN2-EN7 disabled, Vcc2 connected Quiescent current (ground current) Short circuit current Integrated RMS Noise Settling time 4.5 70 270 40 0.1 6.5 120 mA A mA V ms Von/off 0 to 2.4V (regulator enabled) The regulator must function normally under the following conditions: Load current Output capacitor Capacitor ESR 0 0.8 0.01 1.0 0.1 1.0 135 mA F Ceramic
W
MOTOROLA DEVICE DATA
7
MC33283
REGULATOR R5 (R5A, "5V")
ELECTRICAL CHARACTERISTICS (For typical values TA = 25C, for min/max values TA = -40C to +85C/ Max TJ = 125C unless
otherwise noted) Characteristics Output Voltage Test Conditions Recommended operating conditions SEL = HIGH Min 4.5 Typ 4.75 Max 5.0 Unit V Notes Limits apply over all normal operating conditions, except load transient response
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Line Regulation 1Vpp input on VS1IN at 6mA output 0mA < Iout < 15mA 0.3 3.0 60 50 45 20 mV mV dB Load Regulation PSRR 7.5 1V pk-pk, Iout = 11mA 0kHz < f < 3kHz 3kHz < f < 8kHz 8kHz < f < 10kHz ON, Iout = 10mA ON, Iout = 100A 22.5 10Hz - 100kHz, Iout = 6mA 5.0V > Vout > 4.5V Iout = 15mA 50 40 35 EN2-EN7 disabled, Vcc2 connected Quiescent current (ground current) Short circuit current Integrated RMS Noise Settling time 1.2 120 30 40 0.1 0.5 2.0 160 mA A mA V ms ms Von/off 0 to 2.4V (regulator enabled) Charge pump not running when Reg. enabled Include R5b output divider The regulator must function normally under the following conditions: Load current Output capacitor Capacitor ESR SEL = HIGH 0 0.8 0.01 1.0 0.1 1.0 15 mA F Ceramic
W
8
MOTOROLA DEVICE DATA
MC33283
REGULATOR R5 (R5B, "3V")
ELECTRICAL CHARACTERISTICS (For typical values TA = 25C, for min/max values TA = -40C to +85C/ Max TJ = 125C unless
otherwise noted) Characteristics Output Voltage Test Conditions 3.13V < Vcc < 6.5V SEL = LOW Min 2.70 Typ 2.85 Max 3.00 Unit V Notes Limits apply over all normal operating conditions, except load transient response
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Line Regulation 1Vpp @ Iout = 3mA 0mA < Iout < 10mA 0.3 2.0 60 50 45 10 mV mV dB Load Regulation PSRR 7.5 1V pk-pk, Iout = 3mA 0kHz < f < 3kHz 3kHz < f < 8kHz 8kHz < f < 10kHz ON, Iout = 15mA ON, Iout = 100A 22.5 10Hz - 100kHz, Iout = 6mA 3.0V > Vout > 2.7V 50 40 35 Quiescent current (ground current) Short circuit current Integrated RMS Noise Settling time 1.2 80 30 25 0.1 2.0 120 mA A mA V ms Von/off 0 to 2.4V (regulator enabled) The regulator must function normally under the following conditions: Load current Output capacitor Capacitor ESR SEL = LOW 0 0.8 0.01 1.0 0.1 1.0 10 mA F Ceramic
W
MOTOROLA DEVICE DATA
9
MC33283
REGULATOR R6
ELECTRICAL CHARACTERISTICS (For typical values TA = 25C, for min/max values TA = -40C to +85C/ Max TJ = 125C unless
otherwise noted) Characteristics Output Voltage Test Conditions Recommended operating conditions Min 4.75 Typ 4.9 Max 5.25 Unit V Notes Limits apply over all normal operating conditions, except load transient response
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Line Regulation 1Vpp input on VS1IN at 6mA output 0mA < Iout < 20mA 0.3 2.0 60 50 45 4.0 6.0 mV mV dB Load Regulation PSRR 1V pk-pk, Iout = 11mA 0kHz < f < 3kHz 3kHz < f < 8kHz 8kHz < f < 10kHz ON, Iout = 20mA ON, Iout = 100A 30 10Hz - 100kHz, Iout = 6mA 4.75V > Vout > 5.25V Iout = 20mA 50 40 35 Quiescent current (ground current) Short circuit current Integrated RMS Noise Settling time 1.2 70 40 25 0.1 0.5 2.0 120 mA A mA V ms ms Von/off 0 to 2.4V (regulator enabled) Charge pump not running when Reg. enabled The regulator must function normally under the following conditions: Load current Output capacitor Capacitor ESR 0 0.8 0.01 1.0 0.1 1.0 20 mA F Ceramic
W
10
MOTOROLA DEVICE DATA
MC33283
REGULATOR R7
ELECTRICAL CHARACTERISTICS (For typical values TA = 25C, for min/max values TA = -40C to +85C/ Max TJ = 125C unless
otherwise noted) Characteristics Output Voltage Test Conditions 3.13V < Vcc1 < 6.5V Min 2.70 Typ 2.85 Max 3.00 Unit V Notes Limits apply over all normal operating conditions, except load transient response
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Line Regulation 1Vpp @ Iout = 50mA 0mA < Iout < 50mA 0.3 12 60 50 45 10 25 mV mV dB Load Regulation PSRR 1V pk-pk, Iout = 37mA 0kHz < f < 3kHz 3kHz < f < 8kHz 8kHz < f < 10kHz ON, Iout = 50mA ON, Iout = 100A 75 10Hz - 100kHz, Iout = 50mA 3.0V > Vout > 2.7V, Iout = 50mA 50 40 35 Quiescent current (ground current) Short circuit current Integrated RMS Noise Settling time 2.0 70 100 25 0.1 3.0 120 mA A mA V ms Von/off 0 to 2.4V (regulator enabled) The regulator must function normally under the following conditions: Load current Output capacitor Capacitor ESR 0 0.8 0.01 1.0 0.1 1.0 50 mA F Ceramic
W
CHARGE PUMP
Characteristics Test Conditions Min Typ Max Unit Notes The charge pump must function normally under the following conditions: Frequency Noise injected by the charge pump on the battery line Quiescent Current Output Current Source Impedance Input Capacitor Output Capacitor Switching Capacitor NOTES: 1. The structure of the charge pump is a doubler. 1.0 1.0 0 < f < 220kHz 350 < f < 410kHz On, Iout = 25mA On, Iout = 200A and 270 300 20 1.5 1.2 2.5 2.0 25 300 4.7 4.7 4.7 330 kHz Vrms mA mA mW F F F Battery Zin Ceramic Ceramic Ceramic; preferred value 1F Zin = 300 mW
MOTOROLA DEVICE DATA
11
MC33283
REGULATOR ELECTRICAL CHARACTERISTICS
ELECTRICAL CHARACTERISTICS (For typical values TA = 25C, for min/max values TA = -40C to +85C/ Max TJ = 125C unless
otherwise noted)
UNDERVOLTAGE LOCKOUT Undervoltage lockout 1 (UVLO1)
Characteristics Threshold Voltage Hysteresis Test Conditions UVLO2h - UVLO1h > 100mV* Min 2.6 Typ 2.72 90 Max 2.9 Unit V mV Notes
Undervoltage lockout 2 (UVLO2)
Threshold Voltage Hysteresis UVLO2h - UVLO1h > 100mV* 2.85 2.95 100 3.1 V mV
*NOTE: Where the values of UVLO1h and UVLO2h are defined in the section "application hints".
Over temperature protection
Threshold 155 C
12
MOTOROLA DEVICE DATA
MC33283
DEDICATED CONTROL PINS
Characteristics Test Conditions Min Typ Max Unit Notes
Power ON Reset (POR) logic output
Output Current Output Low Voltage Output High Voltage Discharge Current Vcc 2.75V Vout1 > VPOR > 0.6V 2.2 10 Range 0V to 2.2V 4.0 5.0 0.01 2.8 20 6.0 0.3 Vr1* A V V A Vcc < UVLO2 Threshold Vcc UVLO2 Threshold + Hysteresis
*NOTE: Vr1 is the output voltage of regulator 1
Backup Battery Buffer Output (BUB) logic output
Output Low Voltage Output High Voltage 2.0 0.01 2.3 0.7 Vcc V V Vcc < UVLO1 Threshold Vcc UVLO1 Threshold + Hysteresis
UVLO2 logic output (UVLO2OUT)
Output Low Voltage Output High Voltage
*NOTE: Vr1 is the output voltage of regulator 1
0.01 2.3 2.8
0.3 Vr1*
V V
Vcc < UVLO2 Threshold Vcc UVLO2 Threshold + Hysteresis
ON/OFF logic inputs (EN2, EN3, EN5, EN6, EN7)
On/Off Control Voltage On/Off Input Current Control Voltage 2.85V 1.5 1.2 2.0 0.001 0.5 8.0 1.0 V Logic '0' = shutdown Logic '1' = enabled Enabled Shutdown
mA
OUT5 voltage selection pin (SEL) logic input
On/Off Control Voltage On/Off Input Current Control Voltage 2.85V 2.2 1.2 2.0 0.001 0.5 8.0 1.0 V Logic '0' = 3V Operation Logic '1' = 5V Operation 5V Operation 3V Operation
mA
Enable Reset from UVLO2 signal (ENRS) logic input
On/Off Control Voltage 2.2 0.5 0.25 V Logic '0' = UVLO2 disables regulators Logic '1' = UVLO2 no effect on regulators UVLO2 no effect UVLO2 disables regs.
On/Off Input Current
Control Voltage 2.85V
3.0 0.001
8.0 1.0
mA
TOTAL QUIESCENT CURRENT
Quiescent Current Max. Input Current for Vcc2 Vcc2 disconnected Vcc2 = 4.8V 1.0 240 20 300 A A Vcc = 4.8V
MOTOROLA DEVICE DATA
13
MC33283
STATE TABLES
Regulators
Regulators Regulator 1 Regulator Status Enabled Disabled Regulator 2 Enabled Disabled Regulator 3 Enabled Disabled Regulator 6 Enabled Disabled Regulator 7 Enabled Disabled Regulator 5 Selection between 3V/5V Mode Vcc > UVLO1 threshold + hysteresis Vcc < UVLO1 threshold ON/OFF2 = logic "1" ON/OFF2 = logic "0" ON/OFF3 = logic "1" ON/OFF3 = logic "0" ON/OFF6 = logic "1" ON/OFF6 = logic "0" ON/OFF7 = logic "1" ON/OFF7 = logic "0"
3V 5V
SEL = logic low SEL = logic high ON/OFF5 = logic "0" ON/OFF5 = logic "1"
Enabling Regulator 5
Disabled Enabled
CHARGE PUMP
Control Signal ON/OFF6 0 0 X 1 ON/OFF5 0 X 1 X SEL X 0 1 X Disabled Disabled Enabled Enabled Charge Pump Status
14
MOTOROLA DEVICE DATA
MC33283
TYPICAL CHARACTERIZATION CURVES
0.5 0.4 0.3 Vout CHANGE (%) 0.2 0.1 0 -0.1 -0.2 -0.3 -0.4 -0.5 -40 Vout CHANGE (%) VCC = 4 V Iout = TYPICAL 0.5 0.4 0.3 0.2 0.1 0 -0.1 -0.2 -0.3 -0.4 -0.5 -40 Vin = 5.5 V Iout = TYPICAL
-20
0
20
40
60
80
100
-20
0
20
40
60
80
100
Tamb (C)
Tamb (C)
Figure 1. Normalized Output Voltage Change versus Temperature (2.85 V Regulators)
300 250 VCC = 2.9 V Vdrop (mV) 200 150 100 50 0 0 10 20 30 40 Iload (mA) 50 60 70 80 TA = 25C TA = 70C Vdrop (mV)
Figure 2. Normalized Output Voltage Change versus Temperature (5 V Regulators)
400 350 VCC = 2.9 V 300 250 200 150 100 50 0 0 50 100 Iload (mA) 150 200 TA = 70C TA = 25C
Figure 3. Dropout versus Load Current (Regulators R1, R7)
Figure 4. Dropout versus Load Current (Regulator R2)
300 250 VCC = 2.9 V Vdrop (mV) 200 150 100 50 0 0 50 100 Iload (mA) 150 200 TA = 25C TA = 70C Vdrop (mV)
250
200 VCC = 2.9 V 150 TA = 25C TA = 70C
100
50 0 0 5 10 15 20 25 Iload (mA)
Figure 5. Dropout versus Load Current (Regulator R3)
Figure 6. Dropout versus Load Current (Regulator R5b)
MOTOROLA DEVICE DATA
15
MC33283
TYPICAL CHARACTERIZATION CURVES
250 80 70 200 Vdrop (mV) PSRR (dB) TA = 70C 150 TA = 25C 100 60 50 40 30 20 10 0 0 5 10 15 Iload (mA) 20 25 30 0 0.1 1 FREQUENCY (kHz) 10 VCC = 4 V + 1 Vpk-pk Iout = TYPICAL TA = 25C
50
Figure 7. Dropout versus Load Current (Regulators R5a, R6)
600 NOISE DENSITY (nV/kHz) 500 400 300 200 100 0 0.1 1 10 FREQUENCY (kHz) 100 1000 VCC = 3.6 V Vin = 5.5 V Iout = TYPICAL TA = 25C 600 500 400 300 200 100 0 0.1
Figure 8. PSRR versus Frequency (All Regulators)
NOISE DENSITY (nV/kHz)
VCC = 3.6 V Vin = 5.5 V Iout = TYPICAL TA = 25C
1
10 FREQUENCY (kHz)
100
1000
Figure 9. Output Noise Density versus Frequency (Regulators R1, R2, R3, R5a, b)
Figure 10. Output Noise Density versus Frequency (Regulators R6, R7)
350 R2 TO R7 DISABLED Iout = R1 = 0 TA = 25C
5 4 3 Fosc CHANGE (%) 2 1 0 -1 -2 -3 -4 -5 -40 VS 1 in = 4 V
300
Iq ( m A)
250
200
150 100 3 3.5 4 4.5 5 VCC (V) 5.5 6 6.5 7
-20
0
20
40
60
80
100
Tamb (C)
Figure 11. Quiescent Current versus Supply Voltage
Figure 12. Normalized Charge Pump Oscillator Frequency Change versus Temperature
16
MOTOROLA DEVICE DATA
MC33283
TYPICAL OSCILLOSCOPE SHOTS
Figure 13. Start-up response: Regulator 1
Figure 14. Start-up response: Regulator 6
Figure 15. Current step response: Regulator 1
Figure 16. Enable response: Regulator 6
Product Description and Application Hints
Introduction The MC33283 represents a major lead toward large-scale analog integration. More than a simple multi-output low dropout regulator (LDO), it offers a comprehensive solution to power any portable device such as GSM phones etc. The system includes four 2.85V regulators featuring different output current capabilities. These regulators are marked R1, R2, R3 and R7 on the simplified block diagram. This configuration ensures an excellent noise isolation between the LDOs and thus between the downstream electronics. Thanks to the implementation of the charge pump, regulator R6 delivers 5V up to 20mA while the battery is at a lower value. Finally, for maximum flexibility, regulator R5 is a multi-output device in one part: with the help of an external pin, the designer can toggle its value between 4.75V or 2.85V. This regulator is split in two distinct references: R5A and R5B. Individual selection lines are available to enable/disable each regulator. The IC also delivers logical signals to warn the operating system of any abnormal conditions (low battery etc.) Regulators R1, R2, R3, R6, and R7 R1, R2 and R3 are set to a 2.85V nominal value (MC33283FTB28). The LDOs exhibit excellent noise characteristics with a typical 40VRMS (10Hz-100kHz) @ Iout = nominal. In a typical GSM application, R1 can be used to charge a backup battery which safely feeds the operating system when the battery is low (e.g. to keep the clock or any configuration data). The commutation between the supplies (the normal battery or the backup one) is ensured by the BUB signal on pin 12. This level goes low when a weak battery is sensed by UVLO1 and accordingly drives an external P-channel gate. Its purpose is to route the safe battery to the system supply.
MOTOROLA DEVICE DATA
17
MC33283
The regulators accept decoupling capacitors as low as 1F with Equivalent Series Resistor (ESR) varying between 10mW and 3W without jeopardizing the regulator's stability. R1 is only disabled by the UVLO1 circuit when it senses a low battery condition. On the other hand, R2, R3, R6 and R7 can be driven by their respective validation pins. Regulator R5 R5 is multi-output regulator that can be implemented to supply a SIM connector and adapt its operating voltage to either 2.85V (noted R5B) or 4.75V (noted R5A). The selection of the voltage is simply done via the dedicated SEL pin (18) while R5's logical control is ensured through pin 20 (EN5). Charge Pump The charge pump is a stand-alone device. This means that its output can be used to supply another circuitry as long as its maximum current capability is respected (25mA). Operating at a typical 300kHz, it has been designed to lower the injection of high-frequency ripple noise into the battery line. Two seperate standard Schottky diodes like the BAT54LT1 can be used to perform the rectification function. If space is of concern, a dual cathode-to-anode BAT54SLT1 will also perfectly suit. The charge pump accepts up to 4.7F filtering capacitor values. These values impact the output ripple and the output transient capability of the charge pump. As we previously said, the charge pump can supply regulators R5A and R6. In that case, the final charge pump stage (see below drawing) enters the Vin pin (14). The 14 pin can also be supplied by an external power supply as long as it fulfills R5A and R6 dropout conditions.
VS1IN 14 D1 13 1F Wiring the charge pump: BAT54LT1 1F 1F GND_CP 7 B1 15 BAT54LT1 Vin 14
Under Voltage Lockouts (UVLOs) The UVLO1 block monitors the voltage present upon the Vcc2 pin and disables R1 regulator if the battery weakens below 2.72V typical. In that case, R1 is stopped and a low level appears on the BUB pin (12). UVLO2 also monitors the battery level but does not affect R1. UVLO2 directly drives the R2 through R7 ON/OFF authorizations. The UVLO2 signal goes through an internal AND gate whose other input receives the ENRS level (pin 27). If ENRS is low, UVLO2 pilots R2-R7 ON/OFF authorizations. If ENRS is high, UVLO2 level does no longer affect R2-R7 ON/OFF authorizations.
UVLO2h UVLO2l UVLO1h UVLO1l
UVLO1 UVLO2 Note: h represents the maximum value while l the minimum
The charge pump is equipped with an overvoltage (OVLO) comparator. If VS1IN is greater than 6.5V, the charge pump function is disabled. A doubled output voltage could damage R5A, R6 regulators, while 6.5V is enough to supply R5A, R6 directly through the charge pump diodes. The common Vref voltage is used, requiring Vcc2 to be supplied. To minimize the common impedance noise, the charge pump implements its own ground pin (15) whose return length shall be kept as short as possible. Internal voltage reference This reference implements a classical bandgap structure and requires an external bypass capacitor to reduce its noise. A typical ceramic 10nF capacitor will fulfill this function. Please note that this decoupling pin shall not be externally loaded.
Power-On Reset (POR) The power-on reset is asserted (low) immediately when the battery voltage drops below the UVLO2 threshold. When the battery voltage rises above this threshold, a typical 5A current source charges an external capacitor whose value is selected so as to accommodate with any chosen delay. Overall Chip Enable If VCC2 is disconnected, the whole chip is disabled, including the voltage reference, the regulators, the charge pump, the under voltage lock out circuits, the power-on reset and the backup battery switch buffer. Maximum Power Dissipation The maximum power dissipation is given by the following formula: P max
+ TJmax - TA R
qJA
Applying this statement with the MC33283 maximum ratings gives a total maximum power of 1W @ TA = 70C. This 1W corresponds to the sum of all regulators powers. Individual regulator power is obtained by multiplying its operating dropout by its operating currents, at which you add the input voltage multiplied by the quiescent current:
Preg
+ (Vinreg * Voutreg) @ Ioutreg ) Vinreg @ Iquiescent@Iout
Total power is then: PR1 + PR2 + PR3 + PR5 + PR6 + PR7 and shall be kept lower than 1W if operating at an ambient temperature of 70C.
18
MOTOROLA DEVICE DATA
MC33283
OUTLINE DIMENSIONS
FTB SUFFIX PLASTIC PACKAGE CASE 873B-02 (TQFP-32) ISSUE A S 0.150 AC Z
32 1 25 24
V 0.150 AC T-U
0.150 AC T-U
U
T
P
AE AE DETAIL Y
8 9
Y
16
B
Y
Y
17
9 A
Z
0.150 AC Z
AB AD
AC
SEATING PLANE
G
0.100 AC
NOTES: 1. DIMENSIONS AND TOLERANCING PER ASME Y14.5M, 1994. 2. CONTROLLING DIMENSION: MILLIMETER. 3. DATUM PLANE AB IS LOCATED AT BOTTOM OF LEAD AND IS COINCIDENT WITH THE LEAD WHERE THE LEAD EXITS THE PLASTIC BODY AT THE BOTTOM OF THE PARTING LINE. 4. DATUMS T, U AND Z TO BE DETERMINED AT DATUM PLANE AB . 5. DIMENSIONS S AND V TO BE DETERMINED AT SEATING PLANE AC. 6. DIMENSIONS A AND B DO NOT INCLUDE MOLD PROTRUSIONS. ALLOWABLE PROTRUSION IS 0.25 PER SIDE. DIMENSIONS A AND B DO INCLUDE MOLD MISMATCH AND ARE DETERMINED AT DATUM PLANE AB. 7. DIMENSION D DOES NOT INCLUDE DAMBAR PROTRUSION. DAMBAR PROTRUSION SHALL NOT CAUSE THE D DIMENSION TO EXCEED 0.533. 8. MINIMUM SOLDER PLATE THICKNESS SHALL BE 0.0076. 9. EXACT SHAPE OF EACH CORNER MAY VARY FROM DEPICTION. MILLIMETERS MIN MAX 6.950 7.050 6.950 7.050 1.000 1.200 0.300 0.450 0.950 1.050 0.300 0.400 0.800 BSC 0.050 0.150 0.090 0.200 0.500 0.700 12_REF 0.090 0.178 0.400 BSC 0_ 7_ 0.150 0.250 8.950 9.050 8.950 9.050 0.200 REF 1.000 REF
R E
C
H
W
GAUGE PLANE
K X DETAIL AD 0.250
N J
SECTION AE-AE
0.20
Q_
MOTOROLA DEVICE DATA
EEE EEE EEE EEE EEE
8X
M_
F D
M
AC T-U Z
BASE METAL
DIM A B C D E F G H J K M N P Q R S V W X
T, U, Z
19
MC33283
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20
MC33283/D MOTOROLA DEVICE DATA

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