austriamicrosystems AG
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ams AG
The technical content of this austriamicrosystems datasheet is still valid.
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Headquarters:
ams AG
Tobelbaderstrasse 30
8141 Unterpremstaetten, Austria
Tel: +43 (0) 3136 500 0
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Datasheet
AS1364
1 A L o w D r o p o u t L i n e a r Vo l t a g e R e g u l a t o r
1 General Description
The AS1364 is a low-dropout linear regulator (LDO) designed to
operate from 2V to 5.5V input, that delivers a wide range of highly
accurate (±0.75%) factory-trimmed output voltages as well as
adjustable output voltages (using an external resistor-divider
network).
The ultra-low dropout device requires only 140mV dropout voltage
while delivering a guaranteed 1A load current and is therefore
perfectly suited for battery-operated portable applications.
2 Key Features
Guaranteed Output Current: 1A
Low Dropout: 140mV @ 1A
Output Voltage Accuracy: Up to
2.0V to 5.5V Input Voltage
Fixed V
OUT
: 1.2V to 5.0V
Adjustable V
OUT
: 1.2V to 5.3V
Low Ground Current: 35µA
±0.75%
Additionally the AS1364 offers extremely low 10µV
RMS
(100Hz to
100kHz) or 45µV
RMS
(10Hz to 1MHz) output voltage noise.
Table 1. Standard Products
Model
AS1364-AD
AS1364-_ _
Output Type
Adjustable
Fixed
The device features an internal PMOS pass transistor (for a low
supply current of only 35µA), reset output, a low-power shutdown
mode, and protection from short-circuit and thermal-overload
conditions.
When in shutdown, a 5k (typ) discharge path is connected
between the output pin and ground. The AS1364 is available in a
8-pin TDFN 3x3mm package.
Figure 1. AS1364 - Typical Application Diagram
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V
IN
C
IN
4.7µF
On
Off
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Low Shutdown Current: 10nA
BYP
No
Yes
SET
Yes
No
Low Output Noise: 45µV
RMS
(from 10Hz to 1MHz)
Thermal Overload Protection
Output Current Limit
Output discharge path during shutdown
8-pin TDFN 3x3mm Package
3 Applications
The device is ideal for laptops, PDAs, portable audio devices, mobile
phones, cordless phones, and any other battery-operated portable
device.
3
6
OUT
5
C
OUT
4.7µF
V
OUT
IN
4
IN
2
AS1364
OUT
1
POK
7
SET/BYP
Reset Output
C
BYP
10nF
EN
8
GND
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AS1364
Datasheet - P i n A s s i g n m e n t s
4 Pin Assignments
Figure 2. Pin Assignments (Top View)
POK 1
EN 2
8 GND
7 SET/BYP
4.1 Pin Descriptions
Table 2. Pin Descriptions
Pin Number
1
Pin Name
POK
2
EN
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3, 4
IN
5, 6
OUT
7
SET/BYP
GND
8
Exposed pad
Connect to
Substrate
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IN 3
IN 4
6 OUT
5 OUT
AS1364
Description
Note:
Open-Drain POK Output.
POK remains low while V
OUT
is below the POK threshold.
Connect a 100k pull-up resistor from this pin to OUT to obtain an output voltage
(see Figure 1).
Active-Low Shutdown Input.
A logic low disables the output and reduces the supply current to
0.1µA. In shutdown, the POK output is low and OUT high impedance.
V
DD
: Normal operation.
GND: Shutdown.
2.0V to 5.5V Supply Voltage.
Bypass with a 4.7µF input capacitor to GND
(see Dropout Voltage on
page 11).
These inputs are internally connected, but they also must be externally connected for proper
operation.
Regulator Output.
Bypass with a 4.7µF low-ESR output capacitor to GND. Connect the OUT pins
together externally.
Voltage-Setting Input.
Connect to GND to select the factory-preset output voltage. Connect this pin to
an external resistor-divider for adjustable-output operation
(see Figure 1)
– (AS1364-AD only)
Bypass Pin.
Connect a 10nF capacitor from this pin to OUT to improve PSRR and noise performance.
(AS1364-AD does not offer this feature)
Ground
Connect to PCB metal area for heatsink purposes. May be left open or connected to common ground.
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AS1364
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 3
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
Electrical Characteristics on page 4
is not implied. Exposure to absolute
maximum rating conditions for extended periods may affect device reliability.
Table 3. Absolute Maximum Ratings
Parameter
Electrical Parameters
IN, EN, POK to GND
OUT, SET/BYP to GND
Output Short-Circuit Duration
Latch-Up
Electrostatic Discharge
ESD
-100
-0.3
-0.3
+7
V
IN
+ 0.3
Infinite
+100
mA
kV
JEDEC 78
V
V
Min
Max
Units
Comments
Temperature Ranges and Storage Conditions
Thermal Resistance
JA
Operating Temperature Range
Storage Temperature Range
Junction Temperature
Package Body Temperature
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2
HBM MIL-Std. 883E 3015.7
methods
on PCB
36.3
+85
ºC/W
ºC
ºC
-40
-65
+150
+125
ºC
+260
ºC
Revision 1.8
The reflow peak soldering temperature (body temperature)
specified is in accordance with
IPC/JEDEC J-STD-020
“Moisture/Reflow Sensitivity Classification for Non-
Hermetic Solid State Surface Mount Devices”.
The lead finish for Pb-free leaded packages is matte tin
(100% Sn).
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AS1364
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
Note:
All limits are guaranteed. The parameters with min and max values are guaranteed by production tests or SQC (Statistical Quality
Control) methods.
V
IN
= V
OUT(NOM)
+ 500mV or V
IN
= +2.0V (whichever is greater),C
IN
= C
OUT
= 4.7µF, EN = IN, T
AMB
= -40°C to +85ºC (unless otherwise
specified). Typical values are at T
AMB
= +25ºC.
Table 4. Electrical Characteristics
Symbol
V
IN
V
POR
Parameter
Input Voltage
Power On Reset
Output Voltage Accuracy
(Preset Mode)
V
OUT
V
SET/BYP
I
OUT
I
LIMIT
Falling, 100mV hysteresis
I
OUT
= 250mA, T
AMB
= +25ºC
I
OUT
= 250mA
1
Condition
Min
2.0
1.79
-0.75
-1.5
-2
Typ
1.87
Adjustable Output Voltage Range
SET/BYP Voltage Threshold
(Adjustable Mode)
Short-Circuit Current Limit
SET/BYP Threshold
Guaranteed Output Current (RMS)
In-Regulation Current Limit
I
SET
I
Q
V
IN
- V
OUT
V
LNR
V
LDR
SET/BYP Input Bias Current
Ground-Pin Current
2
Dropout Voltage
Line Regulation
Load Regulation
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PSRR
Ripple Rejection
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I
OUT
= 1mA to 1A, V
IN
> (V
OUT
+ 0.5V)
V
IN
= 2.5V, I
OUT
= 250mA,
V
OUT
set to 2.0V
V
OUT
= 0
1.2
5.3
V
1.17
1
1.20
1.23
V
A
1.1
50
1.5
2.3
A
V
OUT
> 96% of nominal value, V
IN
2.0V
V
SET/BYP
= 1.20V
I
OUT
= 100µA
I
OUT
= 1A
1.5
A
100
35
150
mV
nA
-100
+100
150
85
200
75
µA
I
OUT
= 250mA, V
OUT
= 3.3V
I
OUT
= 1A, V
OUT
= 3.3V
35
140
320
mV
V
IN
from (V
OUT
+ 100mV) to 5.5V,
I
LOAD
= 5mA
I
OUT
= 1mA to 1A
-0.125
+0.125
0.001
f = 1kHz, I
OUT
= 10mA, C
BYP
= 10nF
f = 1kHz, I
OUT
= 10mA
78
72
f = 10kHz, I
OUT
= 10mA, C
BYP
= 10nF
f = 10kHz, I
OUT
= 10mA
f = 100kHz, I
OUT
= 10mA, C
BYP
= 10nF
f = 100kHz, I
OUT
= 10mA
100Hz to 100kHz, C
OUT
= 3.3µF,
C
BYP
= 10nF;
100Hz to 100kHz, C
OUT
= 3.3µF;
10Hz to 1MHz, C
OUT
= 3.3µF,
C
BYP
= 10nF;
10Hz to 1MHz, C
OUT
= 3.3µF;
75
65
54
46
10
50
45
70
dB
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5.5
Unit
V
V
1.95
+0.75
%/V
%/mA
µV
RMS
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