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AS1330

Datasheet - D e t a i l e d D e s c r i p t i o n

8 Detailed Description

efficiency from light to heavy loads.

Modern portable devices frequently spend extended time in low-power or standby modes, switching to high power-drain only when certain

functions are enabled. The AS1330 is ideal for portable devices since it maintain high-power conversion efficiency over a wide output power

range, thus increasing battery life in these types of devices.

In addition to high-efficiency at moderate and heavy loads, the AS1330 includes an automatic powersave mode that improves efficiency of the

power converter at light loads. The powersave mode is initiated if the output load current falls below a factory programmed threshold.

Figure 19. AS1330 - Block Diagram

Low-Voltage Start-Up

maximum peak inductor current of 650mA (typ), with 1.5ms (approx.) off-time during start-up, allowing the devices to start up into an output load.

limiting factor for the application is the ability of the battery to supply sufficient energy to the output.

Low-Noise Fixed-Frequency Operation

Oscillator

The AS1330 switching frequency is internally fixed at 4MHz allowing the use of very small external components.

AS1330

+

–

Start Up

OSC

PWM

Control

A/B

MUX

Slope

Compensator

4MHz

Ramp

Generator

+

–

Powersave

Operation

Control

–

Shutdown

Control

PWM

Comp

Σ

+

–

0.8V

Ref

Sync Drive

Control

A

B

Good

1.65V

Amp

Shutdown

Powersave

0.25

Ω

0.35

Ω

C2

4.7µF

1.8V

Output

C1

4.7µF

AA Battery

Current

Sense

GND

2

SW

1

4

EN

3

FB

6

VIN

5

VOUT

L1

1µH

Sense & POK

Logic

1

SENSE

4

POK

On

Off