• Uses Low Equivalent Series Resistance (ESR) Ceramic
Capacitors
• 12-Pin TSOPJW and TDFN33 Packages
• -40°C to +85°C Temperature Range
General Description
The AAT3242 is a dual low dropout linear regulator with
Power OK (POK) outputs. Two integrated regulators pro-
vide 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 appli-
cations 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 the space-saving, Pb-free,
12-pin TSOPJW and TDFN33 packages. This device is
capable of operation over the -40°C to +85°C tempera-
ture 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
3242.2008.08.1.11
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1
PRODUCT DATASHEET
AAT3242
PowerLinear
TM
300mA/150mA Dual CMOS LDO Linear Regulator
Pin Descriptions
Pin #
TSOPJW-12
1
TDFN33-12
12
Symbol
ENA
Function
Enable Regulator A pin; this pin should not be left
fl
oating. When pulled low, the PMOS
pass transistor turns off and the device enters shutdown mode, consuming less than
1μA.
Ground connection pins. For the TDFN33 package, The exposed thermal pad (EP)
should be connected to the board ground plane and Pins 4 and 10. The ground plane
should include a large exposed copper pad under the package with vias to the bottom
layer ground plane for thermal dissipation (see package outline).
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
fl
oating. 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.
Not connected.
2, 3, 8, 9
4, 10, EP
GND
4
5
6
7
10
11
12
n/a
11
9
7
6
5
3
1
2, 8
POKA
OUTB
INB
ENB
POKB
OUTA
INA
N/C
Pin Configuration
TSOPJW-12
(Top View)
TDFN33-12
(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
INA
N/C
OUTA
GND
POKB
ENB
1
2
3
4
5
6
12
11
EP
10
9
8
7
ENA
POKA
GND
OUTB
N/C
INB
2
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3242.2008.08.1.11
PRODUCT DATASHEET
AAT3242
PowerLinear
TM
300mA/150mA Dual CMOS LDO Linear Regulator
Absolute Maximum Ratings
1
Symbol
V
IN
V
ENIN(MAX)
I
OUT2
T
J
T
LEAD
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)
TSOPJW-12
TDFN33-12
TSOPJW-12
4
TDFN33-12
5
Value
110
50
909
2
Units
°C/W
mW
W
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.
5. Derate 6.25mW/°C above 25°C.
3242.2008.08.1.11
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3
PRODUCT DATASHEET
AAT3242
PowerLinear
TM
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
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
I
OUT
= 300mA
V
IN
= V
OUT
+ 1V 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
T
A
= 25°C
T
A
= -40 to 85°C
Min
-1.5
-2.5
V
OUT
+ V
DO5
Typ
Max
1.5
2.5
5.5
600
0.09
Units
%
V
mV
%/V
mV
LDO A; I
OUT
= 300mA
400
5.0
60
0.6
1.5
90
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
=10mA
10kHz
1MHz
94
1.0
98
0.4
1.0
300
600
70
65
45
42
145
12
125
1.0
mV
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 correla-
tion 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
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3242.2008.08.1.11
PRODUCT DATASHEET
AAT3242
PowerLinear
TM
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
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
I
OUT
= 150mA
V
IN
= V
OUT
+ 1V to 5.0V
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
T
A
= 25°C
T
A
= -40 to 85°C
Min
-1.5
-2.5
V
OUT
+ V
DO5
Typ
Max
1.5
2.5
5.5
300
0.09
Units
%
V
mV
%/V
mV
LDO B; I
OUT
= 150mA
200
5.0
60
0.6
1.5
90
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
10kHz
I
OUT
= 10mA
1MHz
94
1.0
98
0.4
1.0
150
600
70
65
45
42
145
12
125
mV
V
V
% of V
OUT
% of V
OUT
V
μA
mA
mA
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 correla-
tion 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
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