AS1351 - Austriamicrosystems

AS1351

Programmable Dual LDO

www.austriamicrosystems.com Revision 1.21 1 - 10

Data Sheet

1 General Description

The AS1351 is a high-performance dual CMOS low-

dropout voltage regulator in a single 3x3mm 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 AS1351 is available in a 12-p in QFN 3x3mm pack-

age.

Figure 1. Pinout Assignments (Top View)

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 V oltage 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 5.5 V

! 0.2V Dropout Voltage @ I = 200mA

! Shutdown Current: ≤1µA

! Supply Current Without Load: 125µA (typ)

! 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

! 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.

AS1351

VDD

VOUT2VOUT1

GND

EN2

EN1

N/C N/C REF

101112

654

VDD

N/C

GND

GND (Exposed Pad)

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AS1351

Data Sheet - Pinout

4 Pinout

Pin Descriptions

Figure 2. Pin Assignments (Top View – Not To Scale)

† All GND pins (3, 4, and 13) must be connected together externally.

Table 1. Pin Descriptions

Number Name Description

1 EN2 Digital input to enable VOUT2.

2 EN1 Digital input to enable VOUT1.

3GND Negative supply voltage. †

4GND Negative supply voltage. †

OUT1 Regulated analog outp ut vol tage 1.

OUT2 Regulated analog outp ut vol tage 2.

7VDD Positive supply voltage. Pins 7 and 9 must be connected together externally.

8 N/C Not connected.

DD Positive supply voltage. Pins 7 and 9 must be connected together externally.

10 REF Analog reference voltage; connect to 100nF capacitor during normal operation.

11 N/C Not connected.

12 N/C Not connected.

13 GND Negative supply voltage; this pin is the exposed pad. †

AS1351

VDD

GND

EN2

EN1

N/C N/C REF

101112

654

VDD

N/C

GND (Exposed Pad)

VOUT2VOUT1GND

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AS1351

Data Sheet - Absolute Maximum Ratings

5 Absolute Maximum Ratings

Stresses beyond those li sted in Tab l e 2 ma y caus e pe rmanent damage to the device. These are stress ratings only,

and functional operation of the device at these or any othe r conditions beyond those indicated in the operational sec-

tions of the specifications is no t implied. Exposure to absolute maximum rating conditions for extended 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 3x3mm 590 1500 mW Min value measured at TAMB = 85°C;

max value measure d at TAMB = 25°C.

Package-Body Peak

T emperature 260 °C

The reflow peak soldering temperature (body

temperature) specified is in accordance with

IPC/JEDEC J-STD-020C “Moisture/Refl ow

Sensitivity Classifi cation for non-hermetic

Solid State Surface Mount Devices”.

Operating Ambient

Temperature -40 85 °C

Storage Temperature -65 150 °C

Electrostatic Discharge

Protection (ESD) Level 1kVHBM – Norm: MIL 883 E method 3015.

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AS1351

Data Sheet - Electrical Characteristics

6 Electrical Characteristics

VDD = 4V; TAMB = -40 to +85 °C (Typ values are for TAMB = 25°C); 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 125 200 µA

tset 1Output Voltage

Settling T ime 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 = 0mA, TAMB = 25°C -1.5 1.5 %

ILOAD = 0 to 200mA -2 2 % 1

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 Vol tage 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 Vo ltage 10 to 100kHz, CREF = 100nF 40 µVRMS

Thermal Protection 145 °C

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AS1351

Data Sheet - Typical Ap plication

7 Typical Application

Figure 3. Typical AS1351_ux Application

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. Custom-

ers can burn the desired output voltages onsite using the austriamicrosystems programming board.

Furthermore, th e AS1351 is availab le in pre-program med versions with fixed output voltages (see Ordering Information

on page 9.)

1µF ±20% (X5R)

2.2µF +100/-50%

(Z5U)

VPERI

VCORE

CMOS

Sensor

2.8V

2.5V

100nF (Improved Noise Performance)

Microprocessor

AS1351_A7

VOUT1

1µF ±20% (X5R)

2.2µF +100/-50%

(Z5U)

VOUT2

VDD

EN1

EN2

GND

GND REF

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AS1351

Data Sheet - Typical Ap plication

Figure 4. AS1351 Block Diagram

Thermal

Protection

Overcurrent

Protection

Softstart

Control

Thermal

Protection

Overcurrent

Protection

Softstart

Control

Reference

Voltage

VDD

VREF

EN1

EN2

GND

REF

VOUT1

VOUT2

AS1351

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AS1351

Data Sheet - Typical Ap plication

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 - Typical Ap plication

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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).

Where:

u = Customer-specific VOUT1 value suffix.

x = Customer-specific VOUT2 value suffix.

Part Programming Pin Package

AS1351 LDO values not programmed 12-pin QFN 3x3

AS1351_A7 VOUT1 = 2.8V, VOUT2 = 2.5V 12-pin QFN 3x3

AS1351_ux Customer-specific LDO values 12-pin QFN 3x3

AS1351_uxF Customer-specific LDO values Bumped Wafer

Table 4. Output Voltages Suffix Guide

Part Suffix Output Voltage

AS1351_ux

F 3.3 V

E 3.2 V

D 3.1 V

C 3.0 V

B 2.9 V

A 2.8 V

9 2.7 V

8 2.6 V

7 2.5 V

6 2.4 V

5 2.3 V

4 2.2 V

3 2.1 V

2 2.0 V

1 1.9 V

0 1.8 V

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AS1351

Data Sheet

Copyrights

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, statutor y, 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, interrup tion 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