AS1352

Programmable Quad LDO

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Revision 1.31

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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.

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 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.

AS1352

12-pin QFN

4x4

GND

EN3

EN4

REF

10

6

9

(Exposed Pad)

8

7

5

4

11

12

EN2

1

EN1

2

3

GND

13

GND

EN3

EN4

REF

13

6

12

10

5

14

15

EN1

1

2

4

AS1352

16-pin QFN

3x3

3

7

8

9

GND

11

EN2

16