AS1352
Programmable Quad LDO
www.austriamicrosystems.com Revision 1.31 1 - 10
Data Sheet
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.
St ability 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 di rect connection of
noise sensitive circuits with out additional filtering net-
works.
The AS1352 is available in a 12-pin QFN 4x4 package
and a 16-pin QFN 3x3 package.
Figure 1. Pinout Assignments (Top View)
2 Key Features
! 4 Independent Voltage Regulators with Shutdown
! Output Current: 200mA each LDO
! One Time Programmable Output Voltage
(User- or Factory-Trimmed)
! Programmable Output V oltage 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 5.5 V
! 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.
AS1352
12-pin QFN
4x4
GND
VOUT3VOUT2VOUT1
EN3 EN4 REF
10
6
9
(Exposed Pad)
VDD
8
VOUT4
7
54
1112
EN2 1
EN1 2
VDD 3
GND
13
GND
VOUT2VOUT1
EN3 EN4 REF
13
6
12
VDD
10
5
1415
EN1 1
VDD 2
VDD 4
AS1352
16-pin QFN
3x3
VDD 3
VOUT3
7
VOUT4
8
VDD
9
GND
11
EN2
16
www.austriamicrosystems.com Revision 1.31 2 - 10
AS1352
Data Sheet - Pinout
4 Pinout
Pin Assignments
Figure 2. Pin Assignments (Top View – Not To Scale)
Pin Descriptions
Table 1. Pin Descriptions
12-pin QFN 4x4
Pin Number 16-pin QFN 3x3
Pin Number Pin Name Description
21EN1
VOUT1 Digital Input Enable
116EN2
VOUT2 Digital Input Enable
12 15 EN3 VOUT3 Digital Input Enable
11 14 EN4 VOUT4 Digital Input Enable
9 11, 12 GND Negative Supply Voltage.
Note: All GND pins must be connected together externally.
13 - GND Negative Supply Voltage. This pin is the exposed pad.
Note: All GND pins must be connected together externally.
10 13 REF Analog Reference Voltage.
Note: Connect to 100nF capacitor during normal operation.
3, 8 2, 3, 4, 9, 10 VDD Positive Supply Voltage.
Note: All VDD pins must be connected together externally.
45V
OUT1 Regulated Analog Output Voltage 1
56VOUT2 Regulated Analog Output Voltage 2
67VOUT3 Regulated Analog Output Voltage 3
78VOUT4 Regulated Analog Output Voltage 4
AS1352
12-pin QFN
4x4
GND
VOUT3VOUT2VOUT1
EN3 EN4 REF
10
6
9
(Exposed Pad)
VDD
8
VOUT4
7
54
1112
EN2 1
EN1 2
VDD 3
GND
13
GND
VOUT2VOUT1
EN3 EN4 REF
13
6
12
VDD
10
5
1415
EN1 1
VDD 2
VDD 4
AS1352
16-pin QFN
3x3
VDD 3
VOUT3
7
VOUT4
8
VDD
9
GND
11
EN2
16
www.austriamicrosystems.com Revision 1.31 3 - 10
AS1352
Data Sheet - Absolute Maximum Ratings
5 Absolute Maximum Ratings
Stresses beyond thos e li st ed 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 Electri cal Character-
istics on page 4 is not implied. Exposure to absolute maximum rating conditions for extend ed periods may affect
device reliability.
Table 2. Absolute Maximum Ratings
Parameter Min Max Units Comments
VDD to GND -0.3 7 V
Any other Pin to GND -0.3 VDD + 0.3 V
Continuous Power Dissipation
QFN12 4x4mm 1100 2800 mW Min value measured at TAMB = 85ºC; max
value measured at TAMB = 25ºC
Operating Ambient
Temperature -40 85 ºC
Storage Temperature -65 150 ºC
Electrostatic Discharge
Protection (ESD) Level 1 kV HBM – Norm: MIL 883 E method 3015
Package-Body Peak
Temperature +260 ºC
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” .
www.austriamicrosystems.com Revision 1.31 4 - 10
AS1352
Data Sheet - Electrical Characteristics
6 Electrical Characteristics
VDD = 4V ; TAMB = -40 to +85ºC. Typ values are @ TAMB = 25ºC, CLOAD = 1µF (Ceramic); (unless otherwise specified).
Notes:
1. Guaranteed by design and verified by lab evaluation.
2. Startup is performed if any EN pin goes high.
Table 3. Electrical Characteristics
Symbol Parameter Conditions Min Typ Max Unit
VDD Supply Voltage Range 3 5.5 V
VOUT Output Voltage Range 1.8 3.3 V
RON On Resistance 1 Ω
PSRR 1Power Supply
Rejection Ratio f = 1kHz, CREF = 100nF 70 dB
f = 100kHz, CREF = 100nF 40
IOFF Shut Down Current ENx = Low 1 µA
IVDD Supply Current Without Load 225 350 µA
tset 1Output Vo ltage
Settling Time ILOAD Switched from 0 to 100mA 50 µs
tstart 1Start-up Time 2CREF = 100nF Pre-charged 300 µs
CREF = 0nF Uncharged 300 µs
CREF = 100nF Uncharged 15 ms
VOUT Output Voltage Tolerance ILOAD = 0 to 200mA -2 2 %
VLINEREG Line Regulation, Static VDD = 5.5V -1 1 %
VDD = 3 to 4.5V -2 2 mV 1
VLOADREG Load Regulation, Static ILOAD = 0 to 50 mA 0.3 2.5 mV 1
ILOAD = 0 to 200 mA
(referenced to 100mA) 0.6 5 mV 1
VIH Enable Input Voltage High 0.6 x VDD V
VIL Enable Input Voltage Low 0.8 V
ILOAD Output Current 0 200 mA
ILIMIT Output Current Limitation 400 mA
VNoise Output Noise Voltage 10 to 100kHz, CREF = 100nF 40 µVRMS
Thermal Protection 145 ºC
www.austriamicrosystems.com Revision 1.31 5 - 10
AS1352
Data Sheet - Application Inform ation
7 Application Information
Figure 3. Typical AS1352-uxyz Application
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, th e AS1352 is availab le in pre-programmed versions with fixed output voltages (see Ordering Information
on page 9).
1µF ±20% (X5R)
2.2µF +100/-50%
(Z5U)
VPERI
VCORE
CMOS
Sensor
2.5V
2.9V
VPERI
VCORE
Camera
IC
3.0V
1.8V
100nF (Improved Noise Performance)
Microprocessor
AS1352-7BC0
VOUT1
1µF ±20% (X5R)
2.2µF +100/-50%
(Z5U)
VOUT2
1µF ±20% (X5R)
2.2µF +100/-50%
(Z5U)
VOUT3
1µF ±20% (X5R)
2.2µF +100/-50%
(Z5U)
VOUT4
VDD
EN1
EN2
EN3
EN4
GND
GND
REF
3V
VDD
www.austriamicrosystems.com Revision 1.31 6 - 10
AS1352
Data Sheet - Application Inform ation
AS1352 Block Diagram
Thermal
Protection
Overcurrent
Protection
Softstart
Control
Thermal
Protection
Overcurrent
Protection
Softstart
Control
Reference
Voltage
Thermal
Protection
Overcurrent
Protection
Softstart
Control
Thermal
Protection
Overcurrent
Protection
Softstart
Control
VDD
VDD
VREF
VREF
VREF
VREF
EN1
EN2
EN3
EN4
GND
REF
VOUT1
VOUT2
VOUT3
VOUT4
AS1352
www.austriamicrosystems.com Revision 1.31 7 - 10
AS1352
Data Sheet - Package Drawings and Markings
8 Package Drawings and Markings
The AS1352 is available in a 12-pin QFN 4x4 package and a 16-pin QFN 3x3 package.
Figure 4. 12-pin QFN 4x4 and 16-pin QFN 3x3 Packages
Notes:
1. Dimensioning and tolerancing conform to ASME Y14.5M-1994.
2. All dimensions are in millimeters; angles in degrees.
D
D/2
Index Area
E
aaa C
aaa C
Top View
2x
2x
4
(D/2 xE/2)
E/2
-B-
-A-
-C-
A3
A1
Side View
Plane
A
ccc C
0.08 C
11 NX Seating
89
NXL
e
NXb
D2/2
D2
E2/2
2
1
E2
bbb C A B
ddd C
-B-
-A-
N N-1
Bottom View
6
5
(D/2 xE/2)
Index Area
4
See
Detail B
SEE
Detail B
Pin 1
Marker
Datum A or B
Even Terminal Side Detail B
Terminal Tip
e
e/2
L1
12
5
Datum A or B
Odd Terminal Side
Terminal Tip
e
L1
12
5
www.austriamicrosystems.com Revision 1.31 8 - 10
AS1352
Data Sheet - Package Drawings and Markings
3. N is the total number of terminals.
4. The terminal #1 identifier and terminal numbering convention shall conform to JEDEC 95 SPP-012. Details of termi-
nal #1 identifier are optional but must be located within the zone indicated. The terminal #1 identifier may be either
a mold or marked feature.
5. Dimension b applies to metallized terminal and is measured between 0.15 and 0.30mm from terminal tip. If one end
of the terminal has the optional radius, the b dimen sion should not be measured in that radius area .
6. Dimensions ND and NE refer to the number of terminals on each D and E side, respectively.
7. Depopulation is possible in a symmetrical fashion.
8. Figure 4 is shown for illustration only and does not represent any specific variation.
9. All variations may be constructed per Figure 4, however variations may alternately be constructed between square
or rectangle shape per dimensions D and E.
10. Refer to the Dimensions Tabl e for a complete set of dimensions.
11 . Bilateral coplanarity zone applies to the exposed heat sink slug as well as the te rminals.
12. Depending on the method of lead termination at the edge of the package, pullback (L1) may be present. L mi nus
L1 to be ≥ 0.33mm.
13. For variations with more than one lead count for a given body size and terminal pitch, each lead count for that vari-
ation is denoted by a dash number (e.g., -1 or -2).
12-pin QFN 4x4 Dimensio ns
Symbol Min Nom Max Notes
aaa 0.15 1, 2
bbb 0.10 1, 2
ccc 0.10 1, 2
ddd 0.05 1, 2
b 0.25 0.30 0.35 1, 2
e0.80
A 0.80 0.90 1.00 1, 2
A1 0.00 0.02 0.05 1, 2
A3 0.20
REF 1, 2
L1 0.03 0.15 1, 2
D BSC 4.00 1, 2, 10
E BSC 4.00 1, 2, 10
D2 2.00 2.15 2.25 1, 2, 10
E2 2.00 2.15 2.25 1, 2, 10
L 0.45 0.55 0. 65 1, 2, 10
N 12 1, 2, 10
ND 3 1, 2, 10
NE 3 1, 2, 10
16-pin QFN 3x3 Dimensions
Symbol Min Nom Max Notes
aaa 0.15 1, 2
bbb 0.10 1, 2
ccc 0.10 1, 2
ddd 0.05 1, 2
b 0.18 0.25 0.30 1, 2
e0.50
A 0.80 0.90 1.00 1, 2
A1 0.00 0.02 0.05 1, 2
A3 0.20
REF 1, 2
L1 0.03 0.15 1, 2
D BSC 3.00 1, 2, 10
E BSC 3.00 1, 2, 10
D2 1.30 1.45 1.55 1, 2, 10
E2 1.30 1.45 1.55 1, 2, 10
L 0.30 0.40 0.50 1, 2, 10
N 16 1, 2, 10
ND 4 1, 2, 10
NE 4 1, 2, 10
www.austriamicrosystems.com Revision 1.31 9 - 10
AS1352
Data Sheet - Ordering Information
9 Ordering Information
The AS1352 is available with preset LDO output voltages or customer-specific versions (with a minimum order quantity
of 30,000). Customer-specific devices are factory trimmed to the desired output voltage (see Table 5)
Table 4. Ordering Information
Model LDO Values Delivery Form Package
AS1352-T User-programmable LDO values. 1
1. The values are programmed via the AS1 352 programming board.
Tape and Reel 12-pin QFN 4x4
AS1352V-T 2
2. Available upon request. Contact austriamicrosystems, AG for more information.
User-programmable LDO values. 1Tape and Reel 16-pin QFN 3x3
AS1352-7BC0-T Factory-trimmed LDO values: VOUT1 = 2.5V, VOUT2 = 2.9V,
VOUT3 = 3.0V, VOUT4 = 1.8V Tape and Reel 12-pin QFN 4x4
AS1352-C0CF-T Factory-trimmed LDO values: VOUT1 = 3.0V, VOUT2 = 1.8V,
VOUT3 = 3.0V, VOUT4 = 3.3V Tape and Reel 12-pin QFN 4x4
AS1352-uxyz-T 3
3. Customer-specific values are as follows:
u = Customer-specific VOUT1 value suffix.
x = Customer-specific VOUT2 value suffix.
y = Customer-specific VOUT3 value suffix.
z = Customer-specific VOUT4 value suffix.
Customer-specific factory-trimmed LDO values. Tape and Reel 12-pin QFN 4x4
AS1352V-uxyz-T 2, 3 Customer-specific factory-trimmed LD O values. Tape and Reel 16-pin QFN 3x3
Table 5. Output Voltage Suffix Guide
Model uxyz Suffix Output Voltage
AS1352-uxyz
F3.3V
E3.2V
D3.1V
C3.0V
B2.9V
A2.8V
92.7V
82.6V
72.5V
62.4V
52.3V
42.2V
32.1V
22.0V
11.9V
01.8V
www.austriamicrosystems.com Revision 1.31 10 - 10
AS1352
Data Sheet
Copyrights
Copyright © 1997-2007, austriamicrosystems AG, Schloss Premstaetten, 8141 Unterpremstaetten, Austria-Europe.
Tr ademarks Registered ®. All rights reserved. The material herein may not be reproduced, adapted, merged, trans-
lated, stored, or used without the prior written consent of the copyright owner.
All products and companies mentioned are trademarks or registered trademarks of their respective companies.
Disclaimer
Devices sold by austriamicrosystems AG are covered by the warranty and patent indemnification provisions appearing
in its Term of Sale. austriamicrosystems AG makes no warranty, express, st atutory, implied, or by description regarding
the information set forth herein or rega rd i ng th e fre e do m of the described devices from patent infringement. austriami-
crosystems AG reserves the right to change specifications and prices at any time and withou t notice. Therefore, prior
to designing this product into a system, it is necessary to check with austriamicrosystems AG for current information.
This product is intended for use in normal commercial applications. Applicati ons requiring extended temperature
range, unusual environmental requirements, or high reliability applications, such as military, medical life-support or life-
sustaining equipment are specifically not recommended without additional processing by austriamicrosystems AG for
each application. For shipments of less than 100 parts the manufacturing flow might show deviations from the standard
production flow, such as test flow or test location.
The information furnished here by austriamicrosystems AG is believed to be correct and accurate. However,
austriamicrosystems AG shall not be liable to recipient or any third party for any dama ges, including but not limited to
personal injury, property damage, loss of profits, loss of use, interruption of business or indirect, special, incidental or
consequential damages, of any kind, in connection with or arising out of the furnishing, performance or use of the tech-
nical data herein. No obligation or liability to recipient or any third party shall arise or flow out of
austriamicrosystems AG rendering of technical or other services.
Cont act Information
Headquarters
austriamicrosystems AG
A-8141 Schloss Premstaetten, Austria
Tel: +43 (0) 3136 500 0
Fax: +43 (0) 3136 525 01
For Sales Offices, Distributors and Representatives, please visit:
http://www.austriamicrosystems.com/contact
