MIC2202 datasheet(6/18 Pages) MICREL

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MIC2202

Micrel

M9999-052104

May 2004

Functional Description

IN provides power to the output and to the internal bias

supply. The supply voltage range is from 2.3V to 5.5V. A

minimum 1

µF ceramic is recommended for bypassing the

input supply.

Enable

The enable pin provides a logic level control of the output. In

the off state, supply current of the device is greatly reduced

(typically <1

µA). Also, in the off state, the output drive is

placed in a “tri-stated” condition, where both the high side

P-Channel MOSFET and the low-side N-Channel are in an off

or non-conducting state. Do not drive the enable pin above

the supply voltage.

Sync_In

Sync_In pin enables the ability to change the fundamental

switching frequency. The Sync_In frequency has a minimum

frequency of 1.6MHz and a maximum sync frequency of

2.5MHz.

Careful attention should be paid to not driving the Sync_In pin

greater than the supply voltage. While this will not damage

the device, it can cause improper operation.

Sync_Out

Sync_Out is an open collector output that provides a signal

equal to the internal oscillator frequency. This creates the

ability for multiple MIC2202s to be connected together in a

master-slave configuration for frequency matching of the

converters. A typical 10k

Ω is recommended for a pull-up

resistor.

Bias

The bias supply is an internal 2.3V linear regulator that

supplies the internal biasing voltage to the MIC2202. A 10nF

ceramic capacitor is required on this pin for bypassing. Do not

use the bias pin as a supply. The bias pin was designed to

supply internal power only.

Feedback

The feedback pin provides the control path to control the

output. A resistor divider connecting the feedback to the

output is used to adjust the desired output voltage. Refer to

the feedback section in the

“Applications Information” for

more detail.

10k

Ω

SYNC_IN

VIN

MIC2202

“Master”

SYNC_OUT

BIAS

SYNC_IN

VIN

MIC2202

“Slave”

SYNC_OUT

BIAS

Figure 1. Master-Slave Operation

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