AS1351

Programmable Dual LDO

www.austriamicrosystems.com

Revision 1.21

1 - 10

Dat a Sh eet

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.

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 AS1351 is available in a 12-pin 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 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:

≤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

GND

EN2

EN1

N/C

N/C

REF

10

11

12

6

5

4

1

2

3

9

8

7

N/C

GND

GND (Exposed Pad)

13