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 reg-
ulators 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 inde-
pendent 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-cir-
cuit and over-temperature protection circuits to
guard against extreme operating conditions.
The AAT3242 is available in a space-saving, Pb-
free, 12-pin TSOPJW package. This device is
capable of operation over the -40°C to +85°C tem-
perature 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
1
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, con-
suming 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
3242.2006.04.1.10
300mA/150mA Dual CMOS LDO Linear Regulator
Absolute Maximum Ratings
1
Symbol
V
IN
V
ENIN(MAX)
I
OUT
2
T
J
T
LEAD
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
P
D
/(V
IN
- V
O
)
-40 to 150
300
Units
V
V
mA
°C
°C
Thermal Information
Symbol
θ
JA
P
D
Description
Thermal Resistance
3
Maximum Power Dissipation (T
A
= 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 condi-
tions 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
3
300mA/150mA Dual CMOS LDO Linear Regulator
Electrical Characteristics
1
V
IN
= V
OUT(NOM)
+ 1.0V for V
OUT
options greater than 1.5V. V
IN
= 2.5V for V
OUT
≤
1.5V. I
OUT
= 1.0mA, C
OUT
=
2.2µF, C
IN
= 1.0µF, T
A
= -40°C to +85°C, unless otherwise noted. Typical values are T
A
= 25°C.
Symbol
V
OUT
V
IN
V
DO
ΔV
OUT
/
V
OUT
*ΔV
IN
ΔV
OUT(Line)
ΔV
OUT(Load)
V
EN(L)
V
EN(H)
V
POK
V
POKHYS
V
POK(LO)
I
POK
I
OUT
I
SC
I
Q
I
SD
PSRR
T
SD
T
HYS
e
N
T
C
AAT3242
Description
Output Voltage Tolerance
Input Voltage
Dropout Voltage
2, 3
Line Regulation
4
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
I
OUT
= 1mA
to 300mA
T
A
= 25°C
T
A
= -40 to 85°C
Min
-1.5
-2.5
V
OUT
+ V
DO
5
Typ Max
1.5
2.5
5.5
600
0.09
Units
%
V
mV
%/V
mV
mV
LDO A; I
OUT
= 300mA
I
OUT
= 300mA
V
IN
= V
OUT
+ 1 to 5.0 V
I
OUT
= 300mA, V
IN
= V
OUT
+ 1
to V
OUT
+ 2, T
R
/T
F
= 2µS
I
OUT
= 1mA to 300mA,
T
R
<5µS
1.5
90
400
5.0
60
0.6
V
OUT
Rising, T
A
= 25°C
I
SINK
= 1mA
V
POK
< 5.5V, V
OUT
in Regulation
V
OUT
> 1.2V
V
OUT
< 0.4V
V
IN
= 5V, No Load; EN A = V
IN
V
IN
= 5V, EN A = 0V
1kHz
I
OUT
=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 V
OUT
% of V
OUT
V
µA
mA
mA
µA
µA
dB
°C
°C
µVRMS
ppm/°C
e
NBW
= 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. V
DO
is defined as V
IN
- V
OUT
when V
OUT
is 98% of nominal.
3. For V
OUT
< 2.1V, V
DO
= 2.5 - V
OUT
.
4. C
IN
= 10µF.
5. To calculate minimum input voltage, use the following equation: V
IN(MIN)
= V
OUT(MAX)
+ V
DO(MAX)
as long as V
IN
≥
2.5V.
4
3242.2006.04.1.10
300mA/150mA Dual CMOS LDO Linear Regulator
Electrical Characteristics
1
(continued)
V
IN
= V
OUT(NOM)
+ 1.0V for V
OUT
options greater than 1.5V. V
IN
= 2.5V for V
OUT
≤
1.5V. I
OUT
= 1.0mA, C
OUT
=
2.2µF, C
IN
= 1.0µF, T
A
= -40°C to +85°C, unless otherwise noted. Typical values are T
A
= 25°C.
Symbol
V
OUT
V
IN
V
DO
ΔV
OUT
/
V
OUT
*ΔV
IN
ΔV
OUT(Line)
ΔV
OUT(Load)
V
EN(L)
V
EN(H)
V
POK
V
POKHYS
V
POK(LO)
I
POK
I
OUT
I
SC
I
Q
PSRR
T
SD
T
HYS
e
N
T
C
AAT3242
Description
Output Voltage Tolerance
Input Voltage
Dropout Voltage
2, 3
Line Regulation
4
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
I
OUT
= 1mA
to 150mA
T
A
= 25°C
T
A
= -40 to 85°C
Min
-1.5
-2.5
V
OUT
+ V
DO
5
Typ Max
1.5
2.5
5.5
300
0.09
Units
%
V
mV
%/V
mV
mV
V
V
% of V
OUT
% of V
OUT
V
µA
mA
mA
µA
dB
°C
°C
µVRMS
ppm/°C
LDO B; I
OUT
= 150mA
I
OUT
= 150mA
V
IN
= V
OUT
+ 1 to 5.0 V
I
OUT
= 150mA, V
IN
= V
OUT
+ 1
to V
OUT
+ 2, T
R
/T
F
= 2µS
I
OUT
= 1mA to 150mA, T
R
<5µS
1.5
90
200
5.0
60
0.6
V
OUT
Rising, T
A
= 25°C
I
SINK
= 1mA
V
POK
< 5.5V, V
OUT
in Regulation
V
OUT
> 1.2V
V
OUT
< 0.4V
V
IN
= 5V, No Load; EN B = V
IN
1kHz
I
OUT
= 10mA 10kHz
1MHz
94
1.0
98
0.4
1.0
150
600
70
65
45
42
145
12
125
e
NBW
= 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. V
DO
is defined as V
IN
- V
OUT
when V
OUT
is 98% of nominal.
3. For V
OUT
< 2.3V, V
DO
= 2.5 - V
OUT
.
4. C
IN
= 10µF.
5. To calculate minimum input voltage, use the following equation: V
IN(MIN)
= V
OUT(MAX)
+ V
DO(MAX)
as long as V
IN
≥
2.5V.
3242.2006.04.1.10
5
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