AS1310 datasheet(8/15 Pages) AMSCO

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AS1310

Datasheet - Detailed Descr i p ti on

8 Detailed Description

The AS1310 is available with fixed output voltages from 1.8V to 3.3V in 50mV steps.

Figure 12. AS1310 - Block Diagram

AS1310 Features

Shutdown

The part is in shutdown mode while the voltage at pin EN is below 0.1V and is active when the voltage is higher than 0.7V.

Note:

EN can be driven above VIN or VOUT, as long as it is limited to less than 3.6V.

Output Disconnect and Inrush Limiting

During shutdown VOUT is going to 0V and no current from the input source is running through the device. This is true as long as the input voltage

is higher than the output voltage.

Feedthrough Mode

If the input voltage is higher than the output voltage the supply voltage is connected to the load through the device. To guarantee a proper func-

tion of the AS1310 it is not allowed that the supply exceeds the maximum allowed input voltage (3.6V).

In this feedtrough mode the quiescent current is 35µA (typ.). The device goes back into step-up mode when the oputput voltage is 4% (typ.)

below VOUTNOM.

Zero

Crossing

Detector

AS1310

Driver

and

Control

Logic

Startup

Circuitry

6.8µH

0.7 to 3.6V

Input

Imax

Detection

CIN

22µF

–

1.8V to 3.3V

Output

COUT

22µF

VOUT

GND

VREF

REF

LBO

VIN

LBI

CREF

100nF

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