AS1352
Programmable Quad LDO
D a ta S he e t
1 General Description
The AS1352 is a high-performance quad CMOS low-
dropout voltage regulator in a single QFN package. The
efficient set of programmable power supplies is opti-
mized to deliver the best compromise between quies-
cent current and regulator performance for mobile
phones, PDAs, MP3 players, and other battery powered
devices.
The one-time-programmable (OTP) function provides
greater design flexibility by allowing for independent pro-
gramming of the output voltage for each regulator on-
site. The OTP function allows for fast prototyping reduc-
ing development times and costs significant. Factory
trimmed versions for full-production are also available.
Stability is guaranteed with ceramic output capacitors of
only 1µF (±20% – X5R) up to 4.7µF (±20% – X5R). The
low equivalent series resistance (ESR) of these capaci-
tors ensures low output impedance at high frequencies.
Regulation performance is excellent even under low
dropout conditions, when the power transistor has to
operate in linear mode.
The low-noise performance allows direct connection of
noise sensitive circuits without additional filtering net-
works.
The AS1352 is available in a 12-pin QFN 4x4 package
and a 16-pin QFN 3x3 package.
2 Key Features
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4 Independent Voltage Regulators with Shutdown
Output Current: 200mA each LDO
One Time Programmable Output Voltage
(User- or Factory-Trimmed)
Programmable Output Voltage Range: 1.8 to 3.3V in
0.1V Steps
Accuracy: ±2%
PSRR: 70dB at 1kHz, 40dB at 100kHz
Line Regulation: ±2mV
Load Regulation: ±0.6mV
Supply Range: 3 to 5.5V
0.2V Dropout Voltage @ I = 200mA
Shutdown Current:
≤1µA
Supply Current Without Load: 225µA
Softstart for Low Inrush Current
Stable with Low ESR Ceramic Capacitors from 1 to
4.7µF
Low Noise: 40µV rms @10Hz to 100kHz Bandwidth
Thermal Protection
Over-Current Protection
Temperature Range: -40 to +85°C
Package Types
- 12-pin QFN 4x4
- 16-pin QFN 3x3
3 Applications
The AS1352 is ideal for cordless and mobile phones,
MP3 players, CD and DVD players, PDAs, handheld
computers, digital cameras, and any other hand-held
battery-powered device.
Figure 1. Pinout Assignments (Top View)
EN3
12
EN4
11
REF
10
EN1
EN2
1
9
GND
V
DD
8
V
DD
V
DD
7
4
5
6
V
OUT4
V
DD
13
EN2
16
1
EN3
15
EN4
14
REF
13
12 GND
AS1352
EN1
2
12-pin QFN
4x4
2
AS1352
16-pin QFN
3x3
11 GND
3
10 V
DD
V
DD
3
4
5
6
7
8
9
V
DD
GND
V
OUT1
V
OUT2
V
OUT3
(Exposed Pad)
V
OUT1
V
OUT2
V
OUT3
V
OUT4
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Revision 1.31
1 - 10
AS1352
Data Sheet
- Pinout
4 Pinout
Pin Assignments
Figure 2. Pin Assignments (Top View – Not To Scale)
EN3
12
EN4
11
REF
10
EN1
EN2
1
9
GND
V
DD
8
V
DD
V
DD
7
4
5
6
V
OUT4
V
DD
13
EN2
16
1
EN3
15
EN4
14
REF
13
12 GND
AS1352
EN1
2
12-pin QFN
4x4
2
AS1352
16-pin QFN
3x3
11 GND
3
10 V
DD
V
DD
3
4
5
6
7
8
9
V
DD
GND
V
OUT1
V
OUT2
V
OUT3
(Exposed Pad)
V
OUT1
V
OUT2
V
OUT3
V
OUT4
Pin Descriptions
Table 1. Pin Descriptions
12-pin QFN 4x4 16-pin QFN 3x3
Pin Number
Pin Number
2
1
12
11
9
13
10
3, 8
4
5
6
7
1
16
15
14
11, 12
-
13
2, 3, 4, 9, 10
5
6
7
8
Pin Name
EN1
EN2
EN3
EN4
GND
GND
REF
V
DD
V
OUT1
V
OUT2
V
OUT3
V
OUT4
Description
V
OUT1
Digital Input Enable
V
OUT2
Digital Input Enable
V
OUT3
Digital Input Enable
V
OUT4
Digital Input Enable
Negative Supply Voltage.
Note:
All GND pins must be connected together externally.
Negative Supply Voltage.
This pin is the exposed pad.
Note:
All GND pins must be connected together externally.
Analog Reference Voltage.
Note:
Connect to 100nF capacitor during normal operation.
Positive Supply Voltage.
Note:
All V
DD
pins must be connected together externally.
Regulated Analog Output Voltage 1
Regulated Analog Output Voltage 2
Regulated Analog Output Voltage 3
Regulated Analog Output Voltage 4
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Revision 1.31
2 - 10
AS1352
Data Sheet
- Absolute Maximum Ratings
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
Electrical Character-
istics 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
V
DD
to GND
Any other Pin to GND
Continuous Power Dissipation
QFN12 4x4mm
Operating Ambient
Temperature
Storage Temperature
Electrostatic Discharge
Protection (ESD) Level
Package-Body Peak
Temperature
Min
-0.3
-0.3
1100
-40
-65
1
Max
7
V
DD
+ 0.3
2800
85
150
Units
V
V
mW
ºC
ºC
kV
HBM – Norm:
MIL 883 E method 3015
The reflow peak soldering temperature (body
temperature) specified is in accordance with
IPC/JEDEC J-STD-020C “Moisture/Reflow
Sensitivity Classification for Non-Hermetic
Solid State Surface Mount Devices”.
Min value measured at T
AMB
= 85ºC; max
value measured at T
AMB
= 25ºC
Comments
+260
ºC
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Revision 1.31
3 - 10
AS1352
Data Sheet
- Electrical Characteristics
6 Electrical Characteristics
V
DD
= 4V; T
AMB
= -40 to +85ºC. Typ values are @ T
AMB
= 25ºC, C
LOAD
= 1µF (Ceramic); (unless otherwise specified).
Table 3. Electrical Characteristics
Symbol
V
DD
V
OUT
R
ON
PSRR
I
OFF
I
VDD
t
set
1
1
Parameter
Supply Voltage Range
Output Voltage Range
On Resistance
Power Supply
Rejection Ratio
Shut Down Current
Supply Current
Output Voltage
Settling Time
2
Conditions
Min
3
1.8
Typ
Max
5.5
3.3
1
Unit
V
V
Ω
dB
f = 1kHz, C
REF
= 100nF
f = 100kHz, C
REF
= 100nF
ENx = Low
Without Load
I
LOAD
Switched from 0 to 100mA
C
REF
= 100nF Pre-charged
70
40
1
225
350
50
300
300
15
-2
-1
-2
0.3
0.6
0.6 x V
DD
0.8
0
400
200
2
1
2
2.5
5
µA
µA
µs
µs
µs
ms
%
%
mV
mV
mV
V
V
mA
mA
µV
RMS
ºC
1
1
1
t
start
1
Start-up Time
C
REF
= 0nF Uncharged
C
REF
= 100nF Uncharged
V
OUT
V
LINEREG
Output Voltage Tolerance
Line Regulation, Static
I
LOAD
= 0 to 200mA
V
DD
= 5.5V
V
DD
= 3 to 4.5V
I
LOAD
= 0 to 50 mA
V
LOADREG
V
IH
V
IL
I
LOAD
I
LIMIT
V
Noise
Load Regulation, Static
Enable Input Voltage High
Enable Input Voltage Low
Output Current
Output Current Limitation
Output Noise Voltage
Thermal Protection
I
LOAD
= 0 to 200 mA
(referenced to 100mA)
10 to 100kHz, C
REF
= 100nF
40
145
Notes:
1. Guaranteed by design and verified by lab evaluation.
2. Startup is performed if any EN pin goes high.
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Revision 1.31
4 - 10
AS1352
Data Sheet
- Application Information
7 Application Information
Figure 3. Typical AS1352-uxyz Application
3V
V
DD
V
OUT1
2.5V
V
PERI
1µF ±20% (X5R)
2.2µF +100/-50%
(Z5U)
CMOS
Sensor
V
OUT2
2.9V
V
CORE
1µF ±20% (X5R)
2.2µF +100/-50%
(Z5U)
V
DD
V
OUT3
3.0V
V
PERI
1µF ±20% (X5R)
2.2µF +100/-50%
(Z5U)
Camera
IC
EN1
V
OUT4
EN2
Microprocessor
EN3
EN4
1µF ±20% (X5R)
2.2µF +100/-50%
(Z5U)
1.8V
V
CORE
AS1352-7BC0
GND
GND
REF
100nF (Improved Noise Performance)
One-Time Programming Procedure Output Voltages
The four LDOs can be programmed and burned to any output voltage between 1.8V and 3.3V in steps of 0.1V. Cus-
tomers can burn the desired output voltages onsite using the austriamicrosystems programming board.
Furthermore, the AS1352 is available in pre-programmed versions with fixed output voltages
(see Ordering Information
on page 9).
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Revision 1.31
5 - 10
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