150mA MicroPower™ High Performance LDO
General Description
The AAT3218 MicroPower low dropout linear regula-
tor is ideally suited for portable applications where
very fast transient response, extended battery life,
and small size are critical. The AAT3218 has been
specifically designed for high-speed turn-on and turn-
off performance, fast transient response, and good
power supply ripple rejection (PSRR), and is reason-
ably low noise, making it ideal for powering sensitive
circuits with fast switching requirements.
Other features include low quiescent current, typical-
ly 70µA, and low dropout voltage, typically less than
200mV at the maximum output current level of
150mA. The device is output short-circuit protected
and has a thermal shutdown circuit for additional pro-
tection under extreme operating conditions.
The AAT3218 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 a small
external capacitor from device reference output to
ground.
The AAT3218 is available in a Pb-free, space-sav-
ing 5-pin SOT23 or 8-pin SC70JW package in 16
factory-programmed voltages: 1.2V, 1.4V, 1.5V,
1.8V, 1.9V, 2.0V, 2.3V, 2.5V, 2.6V, 2.7V, 2.8V,
2.85V, 2.9V, 3.0V, 3.3V, or 3.5V.
AAT3218
Features
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
PowerLinear
™
Low Dropout: 200mV at 150mA
Guaranteed 150mA Output
High Accuracy: ±1.5%
70µA Quiescent Current
Fast Line and Load Transient Response
High-Speed Device Turn-On and Shutdown
High Power Supply Ripple Rejection
Low Self Noise
Short-Circuit and Over-Temperature
Protection
Uses Low Equivalent Series Resistance
(ESR) Ceramic Capacitors
Output Noise Reduction Bypass Capacitor
Shutdown Mode for Longer Battery Life
Low Temperature Coefficient
16 Factory-Programmed Output Voltages
SOT23 5-Pin or SC70JW 8-Pin Package
Applications
•
•
•
•
•
•
Bluetooth™ Headsets
Cellular Phones
Digital Cameras
Notebook Computers
Personal Portable Electronics
Portable Communication Devices
Typical Application
V
IN
IN
OUT
V
OUT
AAT3218
ON/OFF
1μF
EN
GND
10nF
2.2μF
BYP
GND
GND
3218.2006.04.1.8
1
150mA MicroPower™ High Performance LDO
Pin Descriptions
Pin #
SOT23-5
SC70JW-8
AAT3218
Symbol
IN
GND
EN
Function
Input voltage pin; should be decoupled with 1µF or greater
capacitor.
Ground connection pin.
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 1µA.
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 ceramic 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
3218.2006.04.1.8
150mA MicroPower™ High Performance LDO
Absolute Maximum Ratings
1
T
A
= 25°C, unless otherwise noted.
Symbol
V
IN
V
ENIN(MAX)
I
OUT
T
J
AAT3218
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
3
Ambient Temperature Range
Rating
(V
OUT
+V
DO
) 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.
3. 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.
3218.2006.04.1.8
3
150mA MicroPower™ High Performance LDO
Electrical Characteristics
AAT3218
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
= 2.2µF,
C
IN
= 1µF, T
A
= -40°C to +85°C, unless otherwise 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)
t
ENDLY
V
EN(L)
V
EN(H)
I
EN
PSRR
T
SD
T
HYS
e
N
TC
Description
Output Voltage Tolerance
Output Current
Dropout Voltage
1, 2
Short-Circuit Current
Ground Current
Shutdown Current
Line Regulation
Dynamic Line Regulation
Dynamic Load Regulation
Enable Delay Time
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
T
A
= 25°C
to150mA
T
A
= -40°C 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 5.0V
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
BYP = Open
Min
-1.5
-2.5
150
Typ
Max
1.5
2.5
Units
%
mA
mV
mA
µA
µA
%/V
mV
mV
µs
V
V
µA
dB
°C
°C
µVrms
ppm/°C
200
600
70
300
125
1
0.09
2.5
30
15
0.6
1.5
V
EN
= 5V
I
OUT
= 10mA,
C
BYP
= 10nF
1 kHz
10kHz
1MHz
67
47
45
145
12
Noise Power BW = 300Hz - 50kHz
50
22
1
1. V
DO
is defined as V
IN
- V
OUT
when V
OUT
is 98% of nominal.
2. For V
OUT
< 2.3V, V
DO
= 2.5V - V
OUT
.
4
3218.2006.04.1.8
150mA MicroPower™ High Performance LDO
Typical Characteristics
Unless otherwise noted, V
IN
= 5V, T
A
= 25°C.
AAT3218
Dropout Voltage vs. Temperature
3.20
260
240
220
200
180
160
140
120
100
80
60
40
20
0
Dropout Characteristics
Dropout Voltage (mV)
Output Voltage (V)
I
L
= 150mA
I
L
= 100mA
3.00
2.80
2.60
2.40
2.20
2.00
2.70
I
OUT
= 0mA
I
OUT
= 10mA
I
OUT
= 50mA
I
OUT
= 100mA
I
OUT
= 150mA
I
L
= 50mA
-40 -30 -20 -10 0
10 20 30 40 50 60 70 80 90 100 110 120
Temperature (°C)
2.80
2.90
3.00
3.10
3.20
Input Voltage (V)
Dropout Voltage vs. Output Current
300
90.00
80.00
70.00
60.00
50.00
40.00
30.00
20.00
10.00
Ground Current vs. Input Voltage
Dropout Voltage (mV)
250
200
150
100
50
0
0
25
50
75
100
125
150
85°C
25°C
-40°C
Ground Current (μA)
I
OUT
= 150mA
I
OUT
= 0mA
I
OUT
= 50mA
I
OUT
= 10mA
0.00
2
2.5
3
3.5
4
4.5
5
Output Current (mA)
Input Voltage (V)
Quiescent Current vs. Temperature
100
Output Voltage vs. Temperature
1.203
1.202
Quiescent Current (μA)
90
Output Voltage (V)
-40 -30 -20 -10
0
10 20 30 40 50 60 70 80 90 100 110 120
80
70
60
50
40
30
20
10
0
1.201
1.200
1.199
1.198
1.197
1.196
-40 -30 -20 -10
0
10 20
30
40
50 60
70 80
90 100
Temperature (°C)
Temperature (°C)
3218.2006.04.1.8
5
京公网安备 11010802033920号
EEWORLD
