SmartSwitch
TM
AAT3216
150mA MicroPowerTM LDO with PowerOK
Preliminary Information
3216.2004.01.0.94
1
General Description
The AAT3216 MicroPowerTM Low Dropout Linear
Regulator is ideally suited for portable applications
where low noise, extended battery life and small
size are critical. The AAT3216 has been specifi-
cally designed for low output noise performance,
fast transient response and high power supply
rejection ratio (PSRR), making it ideal for powering
sensitive RF circuits.
Other features include low quiescent current, typi-
cally 70A, and low dropout voltage which is typi-
cally less than 200mV at full output current. The
device is output short circuit protected and has a
thermal shutdown circuit for additional protection
under extreme conditions.
The AAT3216 also features a low-power shutdown
mode for extended battery life. A Power-OK open-
drain output signals when V
OUT
is in regulation.
The AAT3216 is available in a space saving 5-pin
SOT23 or 8-pin SC70-JW package in 12 factory
programmed voltages of 1.2V, 1.5V, 1.8V, 2.0V,
2.3V, 2.5V, 2.7V, 2.8V, 2.85, 3.0V, 3.3V, or 3.5V.
Features
Low Dropout - 200mV at 150mA
Guaranteed 150mA Output
High accuracy 1.5%
70A Quiescent Current
High Power Supply Ripple Rejection
Low self noise
PowerOK (POK) Output
Fast line and load transient response
Short circuit protection
Over-Temperature protection
Uses Low ESR ceramic capacitors
Shutdown mode for longer battery life
Low temperature coefficient
12 Factory programmed output voltages
SOT23 5-pin or SC70-JW 8-pin package
Applications
Cellular Phones
Notebook Computers
Desktop Computers
Portable Communication Devices
Personal Portable Electronics
Digital Cameras
Typical Application
AAT3216
EN
IN
OUT
POK
GND
ON/OFF
1
F
2.2
F
V
IN
GND
GND
V
OUT
POK
100k
PowerLinear
TM
AAT3216
150mA MicroPowerTM LDO with PowerOK
2
3216.2004.01.0.94
Pin Descriptions
Pin Configuration
SOT23-5
SC70JW-8
(Top View)
(Top View)
OUT
OUT
OUT
1
2
GND
EN
IN
IN
POK
1
2
3
4
8
7
6
5
1
2
3
POK
EN
OUT
4
5
GND
IN
Pin #
Symbol
Function
SOT23-5
SC70JW-8
1
5, 6
IN
Input voltage pin - should be decoupled with 1F or greater
capacitor.
2
8
GND
Ground connection pin
3
7
EN
Enable pin - this pin should not be left floating. When pulled low
the PMOS pass transistor turns off and all internal circuitry
enters low-power mode, consuming less than 1A.
4
1
POK
Power-OK Output. This open-drain output is low when OUT is out
of regulation. Connect a pull up resistor from POK to OUT or IN.
5
2, 3, 4
OUT
Output pin - should be decoupled with 2.2F ceramic capacitor.
Absolute Maximum Ratings
(T
A
=25C unless otherwise noted)
Note: Stresses above those listed in Absolute Maximum Ratings may cause permanent damage to the device. Functional operation at con-
ditions other than the operating conditions specified is not implied. Only one Absolute Maximum rating should be applied at any one time.
Thermal Information
Note 1: Mounted on a demo board.
Recommended Operating Conditions
Note 2: 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
Rating
Units
V
IN
Input Voltage
2
(V
OUT
+ V
DO
) to 5.5
V
T
Ambient Temperature Range
-40 to +85
C
Symbol
Description
Rating
Units
JA
Maximum Thermal Resistance
1
(SOT23-5, SC70JW-8)
190
C/W
P
D
Maximum Power Dissipation
1
(SOT23-5, SC70JW-8)
526
mW
Symbol
Description
Value
Units
V
IN,
POK
Input Voltage, POK
6
V
I
OUT
DC Output Current
P
D
/(V
IN
-V
O
)
mA
T
J
Operating Junction Temperature Range
-40 to 150
C
AAT3216
150mA MicroPowerTM LDO with PowerOK
3216.2004.01.0.94
3
Electrical Characteristics
(V
IN
=V
OUT(NOM)
+1V for V
OUT
options greater than 1.5V. V
IN
= 2.5 for
V
OUT
1.5V. I
OUT
=1mA, C
OUT
=2.2F, C
IN
=1f, T
A
= -40 to 85C unless otherwise noted. Typical values are at
T
A
=25C)
Note 1: V
DO
is defined as V
IN
- V
OUT
when V
OUT
is 98% of nominal.
Note 2: For V
OUT
< 2.3V, V
DO
= 2.5V - V
OUT
.
Note 3: C
IN
= 10F
Symbol
Description
Conditions
Min Typ Max
Units
V
OUT
Output Voltage Tolerance
I
OUT
= 1mA to 150mA
T
A
=25C
-1.5
1.5
%
T
A
=-40 to 85C -2.5
2.5
%
I
OUT
Output Current
V
OUT
> 1.2V
150
mA
V
DO
Dropout Voltage
1, 2
I
OUT
= 150mA
200
300
mV
I
SC
Short Circuit Current
V
OUT
< 0.4V
600
mA
I
Q
Ground Current
V
IN
= 5V, No load, EN = V
IN
70
125
A
I
SD
Shutdown Current
V
IN
= 5V, EN = 0V
1
A
V
OUT
/V
OUT
*
V
IN
Line Regulation
3
V
IN
= V
OUT
+ 1 to 5.0V
0.09
%/V
V
OUT
(line)
Dynamic Line Regulation
V
IN
=V
OUT
+1V to V
OUT
+2V, I
OUT
=150mA, 5
mV
T
R
/T
F
=2s
V
OUT
(load)
Dynamic Load Regulation
I
OUT
= 1mA to 150mA, T
R
<5s
30
mV
V
EN(L)
Enable Threshold Low
0.6
V
V
EN(H)
Enable Threshold High
1.5
V
I
EN
Leakage Current on Enable Pin
V
EN
= 5V
1
A
V
POK
POK Trip Threshold
V
OUT
rising, T
A
= 25C
90
94
98
% of V
OUT
V
POKHYS
POK Hysteresis
1
% of V
OUT
V
POK(OL)
POK Output Voltage Low
I
SINK
= 1mA
0.4
V
I
POK
POK Output Leakage Current
V
POK
< 5.5V, V
OUT
in regulation
1
A
1 kHz
65
PSRR
Power Supply Rejection Ratio
I
OUT
=10mA
10kHz
45
dB
1MHz
42
T
SD
Over Temp Shutdown Threshold
145
C
T
HYS
Over Temp Shutdown Hysteresis
12
C
e
N
Output Noise
Noise Power BW = 300Hz-50kHz
250
Vrms/rtHz
TC
Output Voltage Temp. Coeff.
22
ppm/C
AAT3216
150mA MicroPowerTM LDO with PowerOK
4
3216.2004.01.0.94
AAT3216
150mA MicroPowerTM LDO with PowerOK
3216.2004.01.0.94
5
Typical Characteristics
(Unless otherwise noted, V
IN
= 5V, T
A
= 25C)
Output Voltage vs. Temperature
1.196
1.197
1.198
1.199
1.200
1.201
1.202
1.203
-40 -30 -20 -10 0
10 20 30
40
50 60
70 80 90 100
Temperature (
C)
Output Voltage (V)
Quiescent Current vs. Temperature
0
10
20
30
40
50
60
70
80
90
100
-40 -30 -20 -10 0
10 20 30 40 50 60 70 80 90 100 110 120
Temperature (
C)
Quiescent Current (
A)
Ground Current vs. Input Voltage
0.00
10.00
20.00
30.00
40.00
50.00
60.00
70.00
80.00
90.00
2
2.5
3
3.5
4
4.5
5
V
IN
(V)
I
GND
(
A)
I
OUT
=0mA
I
OUT
=10mA
I
OUT
=50mA
I
OUT
=150mA
Dropout Voltage vs. Output Current
0
50
100
150
200
250
300
0
25
50
75
100
125
150
Output Current (mA)
Dropout Voltage (mV)
85
C
25
C
-40
C
Dropout Characteristics
2.00
2.20
2.40
2.60
2.80
3.00
3.20
2.70
2.80
2.90
3.00
3.10
3.20
V
IN
(V)
V
OUT
(V)
I
OUT
= 150mA
I
OUT
= 100mA
I
OUT
= 50mA
I
OUT
= 10mA
I
OUT
= 0mA
Dropout Voltage vs. Temperature
0
20
40
60
80
100
120
140
160
180
200
220
240
260
-40 -30 -20 -10 0
10 20 30 40 50 60 70 80 90 100 110 120
Temperature (
C)
Dropout Voltage (mV)
I
L
= 150mA
I
L
= 100mA
I
L
= 50mA
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