AS1341

20V, 600mA, 100% Duty Cycl e, Step-Down Converter

Dat a Sh eet

www.austriamicrosystems.com

Revision 1.00

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1 General Description

The AS1341 is a high-efficiency step-down converter

supply voltages of up to 20V.

An integrated current-limited 0.4

Ω MOSFET delivers

load currents up to 600mA.

The AS1341 also includes a 100% duty cycle LDO

mode with a low dropout of only 250mV for high effi-

ciency if input voltages is in the range of the output volt-

age.

The AS1341 has a low quiescent current (12µA) to

improve light-load efficiency and minimize battery use,

and draws only 0.8µA in shutdown mode.

High switching frequencies (up to 200kHz) allow the use

of small surface-mount inductors and output capacitors.

The device is available in a TDFN-8 3x3mm pin pack-

age.

Figure 1. Typical Application

2 Key Features

!

Output Voltages: Fixed 5V or Adjustable

!

Input Voltage Range: 4.5 to 20V

!

Output Current: Up to 600mA

!

1.25V Lowest Output Voltage

!

Efficiency: up to 96%

!

Quiescent Supply Current: 12µA

!

Power-OK Output

!

Internal 0.4

Ω P-Channel MOSFET

!

Shutdown Current: 0.8µA

!

100% Maximum Duty Cycle for Low Dropout

!

Current-Limited Architecture

!

Thermal Shutdown

!

TDFN-8 3x3mm Package

3 Applications

The device is ideal for notebook computers, distributed

power systems, keep-alive supplies, and any other bat-

tery-operated, portable device.

4.5 to 20V

5

IN

4

LX

1

FB

5V

AS1341

2

GND

8

OUT

D1

L1

+

Indicates High-Power Trace

3

POK

5IN

3

POK

2

GND

1

FB

8OUT

AS1341

4

LX

7 SHDNN

6 ILIMIT

9

7

SHDNN

6

ILIMIT