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AS1351
Programmable Dual LDO
D a ta S he e t
1 General Description
The AS1351 is a high-performance dual CMOS lowdropout voltage regulator in a single 3x3mm package. The efficient set of programmable power supplies is optimized to deliver the best compromise between quiescent 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 programming of the output voltage for each regulator onsite. The OTP function allows for fast prototyping reducing development times and costs significant. Factory trimmed versions for full-production are also available. Stability is guaranteed with ceramic output capacitors of only 1F (20% - X5R) up to 4.7F (20% - X5R). The low equivalent series resistance (ESR) of these capacitors 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 networks. The AS1351 is available in a 12-pin QFN 3x3mm package.
2 Key Features
! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! !
2 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: 1.5% 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: 1A Supply Current Without Load: 125A (typ) Softstart for Low Inrush Current Stable with low ESR Ceramic Capacitors from 1 to 4.7F Low Noise: 40V rms @10Hz to 100kHz Bandwidth Thermal Protection Over-Current Protection Temperature Range: -40 to +85C 12-pin QFN 3x3mm Package
3 Applications
The AS1351 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)
N/C 12 N/C 11 REF 10
EN2 EN1
1
9
VDD
2
AS1351
8
N/C
GND
3
7
VDD
4 GND
5
6
13
GND (Exposed Pad)
VOUT1 VOUT2
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AS1351 Data Sheet
- Pinout
4 Pinout
Pin Descriptions
Figure 2. Pin Assignments (Top View - Not To Scale)
N/C 12 N/C 11 REF 10
EN2 EN1
1
9
VDD
2
AS1351
8
N/C
GND
3
7
VDD
4 GND
5
6
13
GND (Exposed Pad)
VOUT1 VOUT2
Table 1. Pin Descriptions Number 1 2 3 4 5 6 7 8 9 10 11 12 13 Name EN2 EN1 GND GND VOUT1 VOUT2 VDD N/C VDD REF N/C N/C GND Description Digital input to enable VOUT2. Digital input to enable VOUT1. Negative supply voltage. Negative supply voltage.

Regulated analog output voltage 1. Regulated analog output voltage 2. Positive supply voltage. Pins 7 and 9 must be connected together externally. Not connected. Positive supply voltage. Pins 7 and 9 must be connected together externally. Analog reference voltage; connect to 100nF capacitor during normal operation. Not connected. Not connected. Negative supply voltage; this pin is the exposed pad.
All GND pins (3, 4, and 13) must be connected together externally.
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AS1351 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 the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. Table 2. Absolute Maximum Ratings Parameter VDD to GND Any other pin to GND Continuous Power Dissipation QFN12 3x3mm Package-Body Peak Temperature Operating Ambient Temperature Storage Temperature Electrostatic Discharge Protection (ESD) Level Min -0.3 -0.3 590 Max 7 VDD + 0.3 1500 Units V V mW Min value measured at TAMB = 85C; max value measured at TAMB = 25C. 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". Comments
260
C
-40 -65 1
85 150
C C kV HBM - Norm: MIL 883 E method 3015.
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AS1351 Data Sheet
- Electrical Characteristics
6 Electrical Characteristics
VDD = 4V; TAMB = -40 to +85C (Typ values are for TAMB = 25C); CLOAD = 1F (Ceramic); unless otherwise specified. Table 3. Electrical Characteristics Symbol VDD VOUT RON PSRR IOFF IVDD tset
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 dB
f = 1kHz, CREF = 100nF f = 100kHz, CREF = 100nF ENx = Low Without Load ILOAD Switched from 0 to 100mA CREF = 100nF Pre-charged
70 40 1 125 200 50 300 300 15 -1.5 -2 -1 -2 0.3 0.6 0.6 x VDD 0.8 0 400 200 1.5 2 1 2 2.5 5
A A s s s ms % %
1
tstart
1
Start-Up Time
CREF = 0nF Uncharged CREF = 100nF Uncharged ILOAD = 0mA, TAMB = 25C
VOUT
Output Voltage Tolerance
ILOAD = 0 to 200mA VDD = 5.5V
% mV mV mV V V mA mA VRMS C
1 1 1
VLINEREG
Line Regulation, Static
VDD = 3 to 4.5V ILOAD = 0 to 50 mA
VLOADREG
Load Regulation, Static
ILOAD = 0 to 200 mA (referenced to 100mA)
VIH VIL ILOAD ILIMIT VNoise
Enable Input Voltage High Enable Input Voltage Low Output Current Output Current Limitation Output Noise Voltage Thermal Protection 10 to 100kHz, CREF = 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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AS1351 Data Sheet
- Ty p i c a l A p p l i c a t i o n
7 Typical Application
Figure 3. Typical AS1351_ux Application
VDD 3V
VOUT1
2.8V VPERI 1F 20% (X5R) 2.2F +100/-50% (Z5U)
CMOS Sensor
EN1
Microprocessor
VOUT2
2.5V VCORE 1F 20% (X5R) 2.2F +100/-50% (Z5U)
EN2
GND GND
AS1351_A7
REF 100nF (Improved Noise Performance)
One-Time Programming Procedure Output Voltages
The two LDOs can be programmed and burned to any output voltage between 1.8V and 3.3V in steps of 0.1V. Customers can burn the desired output voltages onsite using the austriamicrosystems programming board. Furthermore, the AS1351 is available in pre-programmed versions with fixed output voltages (see Ordering Information on page 9.)
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AS1351 Data Sheet
- Ty p i c a l A p p l i c a t i o n
Figure 4. AS1351 Block Diagram
VDD
Thermal Protection Overcurrent Protection Softstart
VOUT1
VREF EN1
Control
VOUT2
Thermal Protection Overcurrent Protection Softstart
VREF EN2
Control
Reference Voltage
REF
AS1351
GND
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AS1351 Data Sheet
- Ty p i c a l A p p l i c a t i o n
Package Drawings and Markings
The AS1351 is available in a 12-pin QFN 3x3mm package and a wafer bumped package. Figure 5. 12-Pin QFN 3x3mm Package.
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AS1351 Data Sheet
- Ty p i c a l A p p l i c a t i o n
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AS1351 Data Sheet
- Ordering Information
8 Ordering Information
The AS1351 is available with preset LDO output voltages or customer-specific versions (with a minimum order quantity of 30,000). Each customer-specific device is factory trimmed to the desired output voltage (see Table 4). Part AS1351 AS1351_A7 AS1351_ux AS1351_uxF Where: u = Customer-specific VOUT1 value suffix. x = Customer-specific VOUT2 value suffix. Table 4. Output Voltages Suffix Guide Part Suffix F E D C B A 9 AS1351_ux 8 7 6 5 4 3 2 1 0 Output Voltage 3.3 V 3.2 V 3.1 V 3.0 V 2.9 V 2.8 V 2.7 V 2.6 V 2.5 V 2.4 V 2.3 V 2.2 V 2.1 V 2.0 V 1.9 V 1.8 V Programming LDO values not programmed VOUT1 = 2.8V, VOUT2 = 2.5V Customer-specific LDO values Customer-specific LDO values Pin Package 12-pin QFN 3x3 12-pin QFN 3x3 12-pin QFN 3x3 Bumped Wafer
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AS1351 Data Sheet
Copyrights
Copyright (c) 1997-2007, austriamicrosystems AG, Schloss Premstaetten, 8141 Unterpremstaetten, Austria-Europe. Trademarks Registered (R). All rights reserved. The material herein may not be reproduced, adapted, merged, translated, 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, statutory, implied, or by description regarding the information set forth herein or regarding the freedom of the described devices from patent infringement. austriamicrosystems AG reserves the right to change specifications and prices at any time and without 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. Applications requiring extended temperature range, unusual environmental requirements, or high reliability applications, such as military, medical life-support or lifesustaining 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 damages, 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 technical 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.
Contact 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
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