Datasheet
AS1367
150mA, Adaptive Low Drop-Out Linear Regulator
1 General Description
The AS1367 is a precise, low noise, high speed, low
dropout regulator with adaptive operation. Features
included are high ripple rejection and low dropout volt-
age, a reference voltage source, an error amplifier and a
current limiter.
The AS1367 provides high speed operation, low power
consumption and high efficiency by automatically
switching between a light load and a heavy load mode
depending upon the output current level.
The EN function enables the output to be turned off,
while the electric charge at the output capacitor is
discharged via the internal auto-discharge resistance,
and as a result the V
OUT
pin quickly returns to the GND
level.
Furthermore a Bypass Pin is included to reduce noise.
The device features integrate short-circuit and over
current protection. Under-Voltage lockout prevents
erratic operation when the input voltage is slowly
decaying. Thermal Protection shuts down the device
when die temperature reaches 160°C. This is a useful
protection when the device is under sustained short
circuit conditions.
The device is available in a 8-pin TDFN 2x2 package.
2 Key Features
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Low Dropout Voltage: 110mV @ 150mA load
Operating Input Voltage Range: 2.0V to 5.5V
Output Voltage Range: 1.2V to 5.0V (50mV steps)
Max. Output Current: 150mA
Low Shutdown Current: 100nA
High PSRR: 60dB @ 10kHz
Integrated Overtemperature/Overcurrent Protection
Under-Voltage Lockout Feature
Chip Enable Input
Power-OK
Low Quiescent Current: 10µA
Low Output Noise: 15µV @ 100kHz Bandwidth
Operating Temperature Range: -40°C to +85°C
8-pin TDFN 2x2 Package
3 Applications
The AS1367 is ideal for cellular phones, cordless
phones, wireless communication equipment, portable
games, cameras, video recorders, portable audio-video
equipment and personal digital assistants.
Figure 1. AS1367 - Typical Application Diagram
Input
2V to 5.5V
C
IN
1
µ
F
IN
OUT
Output
1.2V to 5.0V
AS1367
IN
POK
R
PU
100kΩ
C
OUT
3.3µF
C
BYP
10nF
ON /
OFF
EN
BYP
GND
SET
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AS1367
Datasheet - P i n A s s i g n m e n t s
4 Pin Assignments
Figure 2. Pin Assignments (Top View)
OUT 1
BYP 2
SET 3
EN 4
Exposed
Pad
8 IN
AS1367
7 IN
6 POK
5 GND
Pin Descriptions
Table 1. Pin Descriptions
Pin Name
OUT
BYP
SET
EN
GND
POK
Description
Regulated Output Voltage.
The current flowing out of this pin is equivalent
to a DC load current. Fixed 1.2, 1.5, 1.8, 3.0, 3.3 and 4.5V output, as well as
1
versions from 1.2V up to 5.0V can be ordered.
Bypass this pin with 3.3µF to GND.
2
Bypass.
This pin should be connected via a 10nF capacitor to pin OUT.
Set Input.
Connect to GND for preset output. Connect to a resistive voltage-
3
divider between OUT and GND to set the output voltage between 1.2V and
5.0V.
Active-High Enable Input.
A logic low reduces the supply current to < 1µA.
4
Connect this pin to pin IN for normal operation.
Ground.
This pin also functions as a heat sink. Solder it to a large pad or to
5
the circuit-board ground plane to maximize power dissipation.
Power-OK Output.
Active-low, open-drain output indicates an out-of-
6
regulation condition. Connect a 100kΩ pull-up resistor to pin OUT for logic
levels. Leave this pin unconnected if the Power-OK feature is not used.
Input Voltage.
These pins should be connected to the positive terminal of
7, 8
the input capacitor. Bypass this pin with 1µF to GND. Input voltage can
range from 2.0V to 5.5V.
Exposed Pad.
This pin also functions as a heat sink. Solder it to a large pad
Exposed Pad or to the circuit-board ground plane to maximize power dissipation. Internally
it is connected GND.
Pin Number
IN
GND
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AS1367
Datasheet - A b s o l u t e M a x i m u m R a t i n g s
5 Absolute Maximum Ratings
Stresses beyond those listed in
Table 2
may cause permanent damage to the device. These are stress ratings only,
and functional operation of the device at these or any other conditions beyond those indicated in
Section 6 Electrical
Characteristics on page 4
is not implied. Exposure to absolute maximum rating conditions for extended periods may
affect device reliability.
Table 2. Absolute Maximum Ratings
Parameter
IN, POK to GND
OUT to GND
BYP to GND
Output Short-Circuit Duration
Continuous Power Dissipation
Operating Temperature Range
Junction Temperature T
J
Thermal Resistance
Θ
JA
Storage Temperature Range
-65
-40
Min
-0.3
-0.3
-0.3
Indefinite
300
+85
+150
+140
+150
Max
+7
V
IN
+ 0.3
V
OUT
+ 0.3
Typ
Units
V
V
V
V
mW
ºC
ºC
ºC/W
ºC
The reflow peak soldering temperature
(body temperature) specified is in
accordance with
IPC/JEDEC J-STD-
020D “Moisture/Reflow Sensitivity
Classification for non-hermetic Solid
State Surface Mount Devices”
Internally limited
Derate 7.1mW/ºC above +70ºC
Comments
Package Body Temperature
+260
ºC
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AS1367
Datasheet - E l e c t r i c a l C h a r a c t e r i s t i c s
6 Electrical Characteristics
V
IN
= V
OUT(NOM)
+ 0.5V or V
IN
= 2V (whichever is greater) , EN = IN, C
IN
= 1µF, C
OUT
= 3.3µF, C
BYP
= 10nF, T
AMB
= -
40°C to +85ºC (unless otherwise specified). Typical values are at T
AMB
= +25ºC.
Table 3. Electrical Characteristics
Symbol
V
IN
V
OUT
ΔV
OUT
Parameter
Input Voltage
Output Voltage
Conditions
Min
2.0
1.2
-1
-2.5
-20
-50
150
50
-100
Typ
Max
5.5
5.0
1
2.5
20
50
Unit
V
V
%
mV
mA
mA
mV
nA
µA
mV
I
OUT
I
LIM
V
SET
I
SET
I
Q
V
IN
-V
OUT
ΔV
LNR
ΔV
LDR
Trimmable in 50mV steps
T
AMB
= +25ºC, I
OUT
= 1mA, V
OUT
> 2V
I
OUT
= 100µA to 150mA, V
OUT
> 2V
Output Voltage Accuracy
T
AMB
= +25ºC, I
OUT
= 1mA, V
OUT
≤
2V
I
OUT
= 100µA to 150mA, V
OUT
≤
2V
Maximum Output Current
V
OUT
forced to GND
Current Limit
V
OUT
up to V
IN
, I
OUT
= 1mA
SET Threshold
SET Input Bias Current SET = 0V
I
OUT
= 0mA
I
OUT
= 100µA
Quiescent Current
I
OUT
= 150mA
Dropout Voltage
Line Regulation
Load Regulation
1
180
100
10
10
15
110
0.02
150
100
16
20
30
200
3.0V < V
OUT
, I
OUT
= 150mA
V
IN
= (V
OUT(NOM)
+ 0.5V) to 5.5V, I
OUT
= 1mA
PSRR
Shutdown
t
ON
I
OFF
V
IH
V
IL
R
SHDN
I
OUT
= 100µA to 150mA
V
IN
= (V
OUT(NOM)
+ 0.5V) to 5.5V within 10µs,
Dynamic Line Transient
I
OUT
= 1mA
Dynamic Load Transient I
OUT
= 1mA to 150mA within 10µs
Output Noise Voltage I
OUT
= 10mA, f = 100Hz to 100kHz
I
OUT
= 10mA, f = 1kHz
Output Voltage Power- I
OUT
= 10mA, f = 10kHz
Supply Rejection Ratio
I
OUT
= 10mA, f = 100kHz
3
4
2
%/V
0.06
0.001 0.01 % / mA
17
12
15
75
60
52
50
mV
mV
µV
RMS
dB
EN Exit Delay
Shutdown Supply
Current
Enable Input Threshold
I
OUT
= 0mA
EN = 0V
1.4
0.1
500
1
0.4
µs
µA
V
Ω
Autodischarge
Resistance
Power-OK Output
V
POK
V
OL
I
POK
SET
V
SET
I
SET
Power-OK Voltage
Threshold
EN = 0V, I
OUT
= 0mA
90
740
94
3
1
50
-100
100
97.5
0.3
100
150
100
I
OUT
= 0mA, V
OUTRISING
I
OUT
= 0mA, V
OUTFALLING
POK Output Low Voltage POK sinking 1mA, EN = 0V
POK Leakage Current V
OUT
in regulation
SET Threshold Voltage
Set Input Bias Current
V
OUT
to V
IN
SET = 0V
%
V
OUT
V
nA
mV
nA
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AS1367
Datasheet - E l e c t r i c a l C h a r a c t e r i s t i c s
Table 3. Electrical Characteristics (Continued)
Symbol
Parameter
Thermal Protection
Thermal Shutdown
T
SHDN
Temperature
Thermal Shutdown
ΔT
SHDN
Hysteresis
Conditions
Min
Typ
160
20
Max
Unit
ºC
ºC
1. Dropout voltage = V
IN
- V
OUT
when V
OUT
is 100mV < V
OUT
for V
IN
= V
OUT(NOM)
+ 0.5V (applies only to nominal
output voltages
≥
2.5V).
2. Guaranteed by design.
3. The rise and fall time of the shutdown signal must not exceed 1ms.
4. The delay time is defined as time required to set V
OUT
to 95% of its final nominal value.
Note:
All limits are guaranteed. The parameters with min and max values are guaranteed with production tests or
SQC (Statistical Quality Control) methods.
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