150mA CMOS High Performance LDO
General Description
The AAT3215 MicroPower™ low dropout (LDO)
linear regulator is ideally suited for portable appli-
cations where low noise, extended battery life, and
small size are critical. The AAT3215 has been
specifically designed for very low output noise per-
formance, 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 95µA, and low dropout voltage which is typi-
cally less than 140mV at full output current. The
device is output short-circuit protected and has a
thermal shutdown circuit for additional protection
under extreme conditions.
The AAT3215 also features a low-power shutdown
mode for extended battery life. A reference bypass
pin has been provided to improve PSRR perform-
ance and output noise by connecting an external
capacitor from the AAT3215's reference output to
ground.
The AAT3215 is available in a Pb-free, space-saving
5-pin SOT23 or 8-pin SC70JW package in ten fac-
tory-programmed voltages: 2.5V, 2.6V, 2.7V, 2.8V,
2.85V, 2.9V, 3.0V, 3.1V, 3.3V, or 3.6V.
AAT3215
Features
•
•
•
•
•
•
•
•
•
•
•
•
•
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PowerLinear
™
SmartSwitch
™
Low Dropout: 140mV at 150mA
Guaranteed 150mA Output
High Accuracy ±1.5%
95µA Quiescent Current
High Power Supply Ripple Rejection
— 70dB at 1kHz
— 50dB at 10kHz
Very Low Self Noise: 45µVrms
Fast Line and Load Transient Response
Short-Circuit Protection
Over-Temperature Protection
Uses Low Equivalent Series Resistance
(ESR) Ceramic Capacitors
Noise Reduction Bypass Capacitor
Shutdown Mode for Longer Battery Life
Low Temperature Coefficient
Ten Factory-Programmed Output Voltages
SOT23 5-Pin or SC70JW 8-Pin Package
Applications
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Bluetooth™ Headsets
Cellular Phones
Digital Cameras
Notebook Computers
Personal Portable Electronics
Portable Communication Devices
Typical Application
V
IN
IN
OUT
V
OUT
AAT3215
ON/OFF
1μF
EN
GND
10nF
2.2μF
BYP
GND
GND
3215.2006.05.1.6
1
150mA CMOS High Performance LDO
Pin Descriptions
Pin #
SOT23-5
SC70JW-8
AAT3215
Symbol
IN
GND
EN
Function
Input voltage pin; should be decoupled with 1µF or greater
capacitor.
Ground connection pin.
Enable pin. When pulled low, the PMOS pass transistor turns
off and all internal circuitry enters low-power mode, consuming
less than 1µA. This pin should not be left floating.
Bypass capacitor connection. To improve AC ripple rejection,
connect a 10nF capacitor to GND. This will also provide a soft-
start function.
Output pin; should be decoupled with 2.2µF capacitor.
1
2
3
5, 6
8
7
4
1
BYP
5
2, 3, 4
OUT
Pin Configuration
SOT23-5
(Top View)
SC70JW-8
(Top View)
IN
GND
EN
1
5
OUT
2
3
4
BYP
BYP
OUT
OUT
OUT
1
2
3
4
8
7
6
5
GND
EN
IN
IN
2
3215.2006.05.1.6
150mA CMOS High Performance LDO
Absolute Maximum Ratings
1
T
A
= 25°C, unless otherwise noted.
Symbol
V
IN
V
ENIN(MAX)
I
OUT
T
J
AAT3215
Description
Input Voltage
Maximum EN to Input Voltage
DC Output Current
Operating Junction Temperature Range
Value
6
0.3
P
D
/(V
IN
-V
O
)
-40 to 150
Units
V
V
mA
°C
Thermal Information
2
Symbol
Θ
JA
P
D
Description
Maximum Thermal Resistance (SOT23-5, SC70JW-8)
Maximum Power Dissipation (SOT23-5, SC70JW-8)
Rating
190
526
Units
°C/W
mW
Recommended Operating Conditions
Symbol
V
IN
T
Description
Input Voltage
Ambient Temperature Range
Rating
(V
OUT
+ 0.3) to 5.5
-40 to +85
Units
V
°C
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. Mounted on a demo board.
3215.2006.05.1.6
3
150mA CMOS High Performance LDO
Electrical Characteristics
V
IN
= V
OUT(NOM)
+ 1V, I
OUT
= 1mA, C
OUT
= 2.2µF, C
IN
= 1µF, C
BYP
= 10nF, T
A
= -40°C to +85°C, unless other-
wise noted. Typical values are T
A
= 25°C.
Symbol
V
OUT
I
OUT
V
DO
I
SC
I
Q
I
SD
ΔV
OUT
/V
OUT
*ΔV
IN
ΔV
OUT
(line)
ΔV
OUT
(load)
V
EN(L)
V
EN(H)
I
EN
PSRR
T
SD
T
HYS
e
N
T
C
AAT3215
Description
Output Voltage Tolerance
Output Current
Dropout Voltage
1
Short-Circuit Current
Ground Current
Shutdown Current
Line Regulation
Dynamic Line Regulation
Dynamic Load Regulation
Enable Threshold Low
Enable Threshold High
Leakage Current on
Enable Pin
Power Supply Rejection Ratio
Over-Temperature Shutdown
Threshold
Over-Temperature Shutdown
Hysteresis
Output Noise
Output Voltage Temperature
Coefficient
Conditions
I
OUT
= 1mA to
T
A
= 25°C
150mA
T
A
= -40 to 85°C
V
OUT
> 1.2V
I
OUT
= 150mA
V
OUT
< 0.4V
V
IN
= 5V, No Load, EN = V
IN
V
IN
= 5V, EN = 0V
V
IN
= V
OUT
+ 1 to 5.5V
V
IN
= V
OUT
+ 1V to V
OUT
+ 2V,
I
OUT
= 150mA, T
R
/T
F
= 2µs
I
OUT
= 1mA to 150mA, T
R
< 5µs
Min Typ
-1.5
-2.5
150
140
600
95
Max
1.5
2.5
250
150
1
0.07
Units
%
mA
mV
mA
µA
µA
%/V
mV
mV
V
V
µA
dB
°C
°C
µVrms
ppm/°C
1
30
0.6
1.5
V
EN
= 5V
I
OUT
= 10mA,
C
BYP
= 10nF
1kHz
10kHz
1MHz
70
50
47
150
10
45
22
1
1. V
DO
is defined as V
IN
- V
OUT
when V
OUT
is 98% of nominal.
4
3215.2006.05.1.6
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