AS1301

5V/50mA Low Noise Inductorless Boost Converter

Dat a Sh eet

www.austriamicrosystems.com

Revision 1.00

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1 General Description

The AS1301 is a 50mA inductorless boost converter

using a double H-bridge charge-pump topology with two

external flying capacitors.

The AS1301 runs on a 1MHz fixed frequency and is

utilized with a low noise regulation scheme to allow

usage together with sensitive RF circuitry from the same

battery supply.

Designed to reside in portable and space limited

equipment the 1MHz charge pump converts a 2.7 to

5.25V input to regulated 5V output with 5% accuracy.

The shutdown function reduces the supply current to

<5µA and disconnects the load from the output. The

integrated soft-start circuitry prevents current spikes

being drawn from the battery during start-up.

The AS1301 is available in TDFN (3x3x0.8mm) 10-pin

and WL-CSP 8-bumps packages.

2 Key Features

!

Up to 92% Efficiency

!

2.7 to 5.25V Input Voltage

!

Regulated 5V Output

!

Automatic Mode Up-Switching

!

<5µA Shutdown Current

!

5V Tolerant Enable Signal

!

Up to 50mA Load Current

!

Overload Protection

!

Output Disconnected During Shutdown

!

Soft Start

!

No Inductor Required

!

Small External Components Required

!

Low Noise Fixed Frequency 1MHz Charge Pump:

- 1:1 Battery Feed Through Mode

- 2:3 Single Phase Mode

- 1:2 Dual Phase Mode

!

Package Options:

- TDFN (3x3x0.8mm) 10-pin

- WL-CSP 8-bumps with 0.5mm pitch

3 Applications

The device is ideal for dual/triple AA cells or single Li-Ion

battery cell to 5V conversion, mobile phones, portable

instruments, microprocessor based systems, remote

data-acquisition systems, inductorless DC-DC

conversion.

Figure 1. Block Diagram

+

AS1301

2.2µF

EN

GND

C1+

C1-

C2+

C2-

5V Supply

2.2µF

On

Off