AAT3242
300mA/150mA Dual CMOS LDO Linear Regulator
3242.2005.01.1.4
1
PowerLinear
TM
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 (140A 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 12-pin
TSOPJW package. This device is capable of oper-
ation over the -40C to +85C temperature range.
Features
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
70A 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
-40C to +85C 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
AAT3242
2.2F
100k
2.2F
Enable B
Enable A
VIN
OUTPUT A
OUTPUT B
POKA
100k
POKB
POKA
OUTA
OUTB
POKB
GND
ENB
INB
INA
ENA
AAT3242
300mA/150mA Dual CMOS LDO Linear Regulator
2
3242.2005.01.1.4
Pin Descriptions
Pin Configuration
TSOPJW-12
(Top View)
1
2
3
4
5
6
12
11
10
9
8
7
ENA
GND
GND
POKA
OUTB
INB
INA
OUTA
POKB
GND
GND
ENB
Pin #
Symbol
Function
1
ENA
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 1A.
2, 3, 8, 9
GND
Ground connection pins.
4
POKA
Power OK pin with open drain output. It is pulled low when the OUTA pin is
below the 10% regulation window.
5
OUTB
Low current (150mA) regulator output pin; should be decoupled with a
2.2F or greater output low-ESR ceramic capacitor.
6
INB
Input voltage pin for Regulator B; should be decoupled with 1F or greater
capacitor.
7
ENB
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 1A.
10
POKB
Power OK pin with open drain output. It is pulled low when the OUTB pin is
below the 10% regulation window.
11
OUTA
High-current (300mA) regulator output pin; should be decoupled with a
2.2F or greater output low-ESR ceramic capacitor.
12
INA
Input voltage pin for Regulator A; should be decoupled with 1F or greater
capacitor.
AAT3242
300mA/150mA Dual CMOS LDO Linear Regulator
3242.2005.01.1.4
3
Absolute Maximum Ratings
1
Notes:
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.
Thermal Information
Note 1: Mounted on an FR4 board.
Note 2: Derate 9.1mW/C above 25C.
Symbol
Description
Value
Units
JA
Thermal Resistance
1
110
C/W
P
D
Maximum Power Dissipation (T
A
= 25C)
2
909
mW
Symbol
Description
Value
Units
V
IN
Input Voltage
6.0
V
V
ENIN(MAX)
Maximum EN to Input Voltage
0.3
V
I
OUT
2
DC Output Current
P
D
/(V
IN
-V
O
)
mA
T
J
Operating Junction Temperature Range
-40 to 150
C
T
LEAD
Maximum Soldering Temperature (at leads, 10 sec)
300
C
AAT3242
300mA/150mA Dual CMOS LDO Linear Regulator
4
3242.2005.01.1.4
Electrical Characteristics
1
V
IN
= V
OUT(NOM)
+ 1.0 V for V
OUT
options greater than 1.5V. V
IN
= 2.5V for V
OUT
1.5 V. I
OUT
= 1.0mA, C
OUT
= 2.2 F, C
IN
= 1.0 F, T
A
= -40C to +85C, unless otherwise noted. Typical values are T
A
= 25C.
Notes:
1: The AAT3242 is guaranteed to meet performance specifications over the -40C to +85C 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
= 10F.
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.
Symbol
Description
Conditions
Min
Typ Max
Units
LDO A; I
OUT
= 300mA
V
OUT
Output Voltage Tolerance
I
OUT
= 1mA T
A
= 25C
-1.5
1.5
%
to 300mA
T
A
= -40 to 85C
-2.5
2.5
V
IN
Input Voltage
V
OUT
+ V
DO
5
5.5
V
V
DO
Dropout Voltage
2,3
I
OUT
= 300mA
400 600
mV
V
OUT
/
Line Regulation
4
V
IN
= V
OUT
+ 1 to 5.0 V
0.09
%/V
V
OUT
*V
IN
V
OUT(Line)
Dynamic Line Regulation
I
OUT
= 300mA, V
IN
= V
OUT
+ 1
5.0
mV
to V
OUT
+ 2, T
R
/T
F
= 2S
V
OUT(Load)
Dynamic Load Regulation
I
OUT
= 1mA to 300mA,
60
mV
T
R
<5S
V
EN(L)
Enable Threshold Low
0.6
V
V
EN(H)
Enable Threshold High
1.5
V
V
POK
Power OK Trip Threshold
V
OUT
Rising, T
A
= 25C
90
94
98
% of V
OUT
V
POKHYS
Power OK Hysteresis
1.0
% of V
OUT
V
POK(LO)
Power OK Output Voltage Low
I
SINK
= 1mA
0.4
V
I
POK
POK Output Leakage Current
V
POK
<5.5V, V
OUT
in Regulation
1.0
A
I
OUT
Output Current
V
OUT
> 1.2V
300
mA
I
SC
Short-Circuit Current
V
OUT
< 0.4V
600
mA
I
Q
Ground Current
V
IN
=5V, No Load; EN A = V
IN
70
125
A
I
SD
Shutdown Current
V
IN
= 5V, EN A = 0V
1.0
A
1kHz
65
PSRR
Power Supply Rejection Ratio
I
OUT
=10mA 10kHz
45
dB
1MHz
42
T
SD
Over-Temperature Shutdown
145
C
Threshold
T
HYS
Over-Temperature Shutdown
12
C
Hysteresis
e
N
Output Noise
e
NBW
= 300Hz to 50kHz
250
VRMS
TC
Output Voltage Temperature
22
ppm/C
Coefficient
AAT3242
300mA/150mA Dual CMOS LDO Linear Regulator
3242.2005.01.1.4
5
Electrical Characteristics
1
(continued)
V
IN
= V
OUT(NOM)
+ 1.0 V for V
OUT
options greater than 1.5V. V
IN
= 2.5V for V
OUT
1.5 V. I
OUT
= 1.0mA, C
OUT
= 2.2 F, C
IN
= 1.0 F, T
A
= -40C to +85C, unless otherwise noted. Typical values are T
A
= 25C.
Notes:
1: The AAT3242 is guaranteed to meet performance specifications over the -40C to +85C 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
= 10F.
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.
Symbol
Description
Conditions
Min
Typ Max
Units
LDO B; I
OUT
= 150mA
V
OUT
Output Voltage Tolerance
I
OUT
= 1mA T
A
= 25C
-1.5
1.5
%
to 150mA
T
A
= -40 to 85C
-2.5
2.5
V
IN
Input Voltage
V
OUT
+ V
DO
5
5.5
V
V
DO
Dropout Voltage
2,3
I
OUT
= 150mA
200 300
mV
V
OUT
/
Line Regulation
4
V
IN
= V
OUT
+ 1 to 5.0 V
0.09
%/V
V
OUT
*V
IN
V
OUT(Line)
Dynamic Line Regulation
I
OUT
= 150mA, V
IN
= V
OUT
+ 1
5.0
mV
to V
OUT
+ 2, T
R
/T
F
= 2 S
V
OUT(Load)
Dynamic Load Regulation
I
OUT
= 1mA to 150mA, T
R
<5S
60
mV
V
EN(L)
Enable Threshold Low
0.6
V
V
EN(H)
Enable Threshold High
1.5
V
V
POK
Power OK Trip Threshold
V
OUT
Rising, T
A
= 25C
90
94
98
% of V
OUT
V
POKHYS
Power OK Hysteresis
1.0
% of V
OUT
V
POK(LO)
Power OK Output Voltage Low
I
SINK
= 1mA
0.4
V
I
POK
POK Output Leakage Current
V
POK
<5.5V, V
OUT
in Regulation
1.0
A
I
OUT
Output Current
V
OUT
> 1.2V
150
mA
I
SC
Short-Circuit Current
V
OUT
< 0.4V
600
mA
I
Q
Ground Current
V
IN
= 5V, No Load; EN B = V
IN
70
125
A
1kHz
65
PSRR
Power Supply Rejection Ratio
I
OUT
= 10mA 10kHz
45
dB
1MHz
42
T
SD
Over-Temperature Shutdown
145
C
Threshold
T
HYS
Over-Temperature Shutdown
12
C
Hysteresis
e
N
Output Noise
e
NBW
= 300Hz to 50kHz
250
VRMS
T
C
Output Voltage Temperature
22
ppm/C
Coefficient
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