300mA/150mA Dual CMOS LDO Linear Regulator General Description
The AAT3242 is a dual low dropout linear regulator with Power OK (POK) outputs. Two integrated regulators provide a high power 300mA output and a lower power 150mA output, making this device ideal for use with microprocessors and DSP cores in portable products. Two POK pins provide open drain output signals when their respective regulator output is within regulation. The AAT3242 has independent input voltage and enable pins for increased design flexibility. This device features a very low quiescent current (140µA typical) and low dropout voltages (typically 200mV and 400mV at the full output current level), making it ideal for portable applications where extended battery life is critical. The AAT3242 has complete over-current/short-circuit and over-temperature protection circuits to guard against extreme operating conditions. The AAT3242 is available in a space-saving, Pbfree, 12-pin TSOPJW package. This device is capable of operation over the -40°C to +85°C temperature range.
AAT3242
Features
• • • • • • • • • • • •
PowerLinear™
High/Low Current Outputs, 300mA/150mA Low Dropout: — LDO A: 400mV at 300mA — LDO B: 200mV at 150mA High Output Voltage Accuracy: ±1.5% High PSRR: 65dB at 1kHz 70µA Quiescent Current for Each LDO Over-Current/Short-Circuit Protection Over-Temperature Protection Two POK Outputs Independent Power and Enable Inputs Uses Low Equivalent Series Resistance (ESR) Ceramic Capacitors 12-Pin TSOPJW Package -40°C to +85°C Temperature Range
Applications
• • • • • • • Cellular Phones Digital Cameras Handheld Instruments Microprocessor / DSP Core / I/O Power Notebook Computers PDAs and Handheld Computers Portable Communication Devices
Typical Application
VIN INA OUTA OUTPUT A 100kΩ POKA OUTPUT B 100kΩ POKB Enable B ENB GND POKB 2.2μF 2.2μF
AAT3242
Enable A ENA POKA OUTB INB
3242.2006.04.1.10
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300mA/150mA Dual CMOS LDO Linear Regulator Pin Descriptions
Pin #
1
AAT3242
Symbol
ENA
Function
Enable Regulator A pin; this pin should not be left floating. When pulled low, the PMOS pass transistor turns off and the device enters shutdown mode, consuming less than 1µA. Ground connection pins. Power OK pin with open drain output. It is pulled low when the OUTA pin is below the 10% regulation window. Low current (150mA) regulator output pin; should be decoupled with a 2.2µF or greater output low-ESR ceramic capacitor. Input voltage pin for Regulator B; should be decoupled with 1µF or greater capacitor. Enable Regulator B; this pin should not be left floating. When pulled low, the PMOS pass transistor turns off and the device enters shutdown mode, consuming less than 1µA. Power OK pin with open drain output. It is pulled low when the OUTB pin is below the 10% regulation window. High-current (300mA) regulator output pin; should be decoupled with a 2.2µF or greater output low-ESR ceramic capacitor. Input voltage pin for Regulator A; should be decoupled with 1µF or greater capacitor.
2, 3, 8, 9 4 5 6 7
GND POKA OUTB INB ENB
10 11 12
POKB OUTA INA
Pin Configuration
TSOPJW-12 (Top View)
ENA GND GND POKA OUTB INB
1 2 3 4 5 6
12 11 10 9 8 7
INA OUTA POKB GND GND ENB
2
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300mA/150mA Dual CMOS LDO Linear Regulator Absolute Maximum Ratings1
Symbol
VIN VENIN(MAX) IOUT2 TJ TLEAD
AAT3242
Description
Input Voltage Maximum EN to Input Voltage DC Output Current Operating Junction Temperature Range Maximum Soldering Temperature (at leads, 10 sec)
Value
6.0 0.3 PD/(VIN - VO) -40 to 150 300
Units
V V mA °C °C
Thermal Information
Symbol
θJA PD
Description
Thermal Resistance3 Maximum Power Dissipation (TA = 25°C)4
Value
110 909
Units
°C/W mW
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. 2. Based on long-term current density limitation. 3. Mounted on an FR4 board. 4. Derate 9.1mW/°C above 25°C. 3242.2006.04.1.10
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300mA/150mA Dual CMOS LDO Linear Regulator Electrical Characteristics1
VIN = VOUT(NOM) + 1.0V for VOUT options greater than 1.5V. VIN = 2.5V for VOUT ≤ 1.5V. IOUT = 1.0mA, COUT = 2.2µF, CIN = 1.0µF, TA = -40°C to +85°C, unless otherwise noted. Typical values are TA = 25°C. Symbol
VOUT VIN VDO ΔVOUT/ VOUT*ΔVIN ΔVOUT(Line) ΔVOUT(Load) VEN(L) VEN(H) VPOK VPOKHYS VPOK(LO) IPOK IOUT ISC IQ ISD PSRR TSD THYS eN TC
AAT3242
Description
Output Voltage Tolerance Input Voltage Dropout Voltage2, 3 Line Regulation4 Dynamic Line Regulation Dynamic Load Regulation Enable Threshold Low Enable Threshold High Power OK Trip Threshold Power OK Hysteresis Power OK Output Voltage Low POK Output Leakage Current Output Current Short-Circuit Current Ground Current Shutdown Current Power Supply Rejection Ratio Over-Temperature Shutdown Threshold Over-Temperature Shutdown Hysteresis Output Noise Output Voltage Temperature Coefficient
Conditions
IOUT = 1mA to 300mA TA = 25°C TA = -40 to 85°C
Min
-1.5 -2.5 VOUT + VDO5
Typ Max
1.5 2.5 5.5 600 0.09
Units
% V mV %/V mV mV
LDO A; IOUT = 300mA
IOUT = 300mA VIN = VOUT + 1 to 5.0 V IOUT = 300mA, VIN = VOUT + 1 to VOUT + 2, TR/TF = 2µS IOUT = 1mA to 300mA, TR 1.2V VOUT < 0.4V VIN = 5V, No Load; EN A = VIN VIN = 5V, EN A = 0V 1kHz IOUT =1 0mA 10kHz 1MHz
94 1.0
98 0.4 1.0
300 600 70 65 45 42 145 12 125 1.0
V V % of VOUT % of VOUT V µA mA mA µA µA dB °C °C µVRMS ppm/°C
eNBW = 300Hz to 50kHz
250 22
1. The AAT3242 is guaranteed to meet performance specifications over the -40°C to +85°C operating temperature range and is assured by design, characterization, and correlation with statistical process controls. 2. VDO is defined as VIN - VOUT when VOUT is 98% of nominal. 3. For VOUT < 2.1V, VDO = 2.5 - VOUT. 4. CIN = 10µF. 5. To calculate minimum input voltage, use the following equation: VIN(MIN) = VOUT(MAX) + VDO(MAX) as long as VIN ≥ 2.5V.
4
3242.2006.04.1.10
300mA/150mA Dual CMOS LDO Linear Regulator Electrical Characteristics1 (continued)
VIN = VOUT(NOM) + 1.0V for VOUT options greater than 1.5V. VIN = 2.5V for VOUT ≤ 1.5V. IOUT = 1.0mA, COUT = 2.2µF, CIN = 1.0µF, TA = -40°C to +85°C, unless otherwise noted. Typical values are TA = 25°C. Symbol
VOUT VIN VDO ΔVOUT/ VOUT*ΔVIN ΔVOUT(Line) ΔVOUT(Load) VEN(L) VEN(H) VPOK VPOKHYS VPOK(LO) IPOK IOUT ISC IQ PSRR TSD THYS eN TC
AAT3242
Description
Output Voltage Tolerance Input Voltage Dropout Voltage2, 3 Line Regulation4 Dynamic Line Regulation Dynamic Load Regulation Enable Threshold Low Enable Threshold High Power OK Trip Threshold Power OK Hysteresis Power OK Output Voltage Low POK Output Leakage Current Output Current Short-Circuit Current Ground Current Power Supply Rejection Ratio Over-Temperature Shutdown Threshold Over-Temperature Shutdown Hysteresis Output Noise Output Voltage Temperature Coefficient
Conditions
IOUT = 1mA to 150mA TA = 25°C TA = -40 to 85°C
Min
-1.5 -2.5 VOUT + VDO5
Typ Max
1.5 2.5 5.5 300 0.09
Units
% V mV %/V mV mV V V % of VOUT % of VOUT V µA mA mA µA dB °C °C µVRMS ppm/°C
LDO B; IOUT = 150mA
IOUT = 150mA VIN = VOUT + 1 to 5.0 V IOUT = 150mA, VIN = VOUT + 1 to VOUT + 2, TR/TF = 2µS IOUT = 1mA to 150mA, TR 1.2V VOUT < 0.4V VIN = 5V, No Load; EN B = VIN 1kHz IOUT = 10mA 10kHz 1MHz
94 1.0
98 0.4 1.0
150 600 70 65 45 42 145 12 125
eNBW = 300Hz to 50kHz
250 22
1. The AAT3242 is guaranteed to meet performance specifications over the -40°C to +85°C operating temperature range and is assured by design, characterization, and correlation with statistical process controls. 2. VDO is defined as VIN - VOUT when VOUT is 98% of nominal. 3. For VOUT < 2.3V, VDO = 2.5 - VOUT. 4. CIN = 10µF. 5. To calculate minimum input voltage, use the following equation: VIN(MIN) = VOUT(MAX) + VDO(MAX) as long as VIN ≥ 2.5V. 3242.2006.04.1.10
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300mA/150mA Dual CMOS LDO Linear Regulator Typical Characteristics
Unless otherwise noted, VIN = 5V, TA = 25°C.
AAT3242
Dropout Voltage vs. Temperature
3.20
Dropout Characteristics
540
Dropout Voltage (mV)
420 360 300 240 180 120 60 0 -40 -30 -20 -10 0
Output Voltage (V)
480
IL = 300mA
3.00 2.80 2.60 2.40 2.20 2.00 2.70
IOUT = 0mA
IL = 150mA
IL = 100mA
IOUT = 300mA IOUT = 150mA IOUT = 10mA
2.80
IOUT = 100mA IOUT = 50mA
IL = 50mA
10 20 30 40 50 60 70 80 90 100 110 120
2.90
3.00
3.10
3.20
3.30
Temperature (°C)
Input Voltage (V)
Dropout Voltage vs. Output Current
500 90 80 70 60 50 40 30 20 10 0 0 50 100 150 200 250 300 2
Ground Current vs. Input Voltage
Dropout Voltage (mV)
400 350 300 250 200 150 100 50 0
Ground Current (μA)
450
85°C 25°C -40°C
IOUT = 300mA IOUT = 0mA IOUT = 150mA IOUT = 50mA
IOUT = 10mA
2.5
3
3.5
4
4.5
5
Output Current (mA)
Input Voltage (V)
Quiescent Current vs. Temperature
100
Output Voltage vs. Temperature
1.203 1.202
Quiescent Current (μA)
90
Output Voltage (V)
-40 -30 -20 -10 0 10 20 30 40 50 60 70 80 90 100 110 120
80 70 60 50 40 30 20 10 0
1.201 1.200 1.199 1.198 1.197 1.196 -40 -30 -20 -10
0
10 20
30
40
50 60
70 80
90 100
Temperature (°C)
Temperature (°C)
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300mA/150mA Dual CMOS LDO Linear Regulator Typical Characteristics
Unless otherwise noted, VIN = 5V, TA = 25°C.
AAT3242
Turn-On Time and POK Delay
Line Transient Response
VENABLE (2V/div)
Input Voltage (V)
6 5
3.25
VIN
3.20
Output Voltage (V)
VOUT (500mV/div) VPOK (500mV/div)
4 3 2 1 0 -1
3.15 3.10 3.05 3.00
VOUT
2.95 2.90 2.85
Time (10μs/div)
-2
Time (100μs/div)
Load Transient Response
2.90 2.85 2.80 2.75 2.70 2.65 2.60 500 400 300 200 100 3.00
Load Transient Response 300mA
800 700
Output Voltage (V)
2.90 2.80 2.70 2.60 2.50 2.40 2.30 2.20 2.10
Output Current (mA)
Output Current (mA)
Output Voltage (V)
VOUT
VOUT
600 500 400 300 200
IOUT
0 -100
IOUT
100 0 -100
Time (100μs/div)
Time (10μs/div)
POK Output Response
VIN (2V/div)
1200
Over-Current Protection
1000 800 600 400 200 0 -200
VOUT (2V/div)
VPOK (1V/div)
Output Current (mA)
Time (200μs/div)
Time (20ms/div)
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300mA/150mA Dual CMOS LDO Linear Regulator Typical Characteristics
Unless otherwise noted, VIN = 5V, TA = 25°C.
AAT3242
Self Noise
Noise Amplitude (μV/rtHz)
10 1.250 1.225 1.200 1
VEN(H) and V EN(L) vs. VIN
VEN (V)
1.175 1.150 1.125 1.100 1.075
VEN(H)
0.1
VEN(L)
0.01 0.01
0.1
1
10
100
1000
1.050 2.5
3.0
3.5
4.0
4.5
5.0
5.
Frequency (kHz)
Input Voltage (V)
8
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300mA/150mA Dual CMOS LDO Linear Regulator Functional Block Diagram
AAT3242
INA
Over-Current Protection Over Temperature Protection Voltage Reference
+
OUTA
ENA
+ Error Amplifier -
POK A
91% VREF
INB
Over-Current Protection Over Temperature Protection + Error Amplifier +
OUTB
POKB
ENB
Voltage Reference
91% VREF
GND
Functional Description
The AAT3242 is a high performance dual LDO regulator with two Power OK pins. The first regulator (A) sources 300mA of current, while the second (B) regulator can deliver 150mA. Each regulator has an integrated Power OK comparator which indicates when the respective output is out of regulation. The POK pins are open drain outputs, and they are held low when the respective regulator is in shutdown mode.
The device has independent enable pins to shut down each LDO regulator for power conservation in portable products. Forcing EN A/B low (