MIC2202BML datasheet(6/19 Pages) MICREL

6 / 19 page

Micrel, Inc.

MIC2202

March 2007

M9999-031907

Functional Description

VIN

VIN provides power to the output and to the internal bias

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

minimum 1µF 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 <1µA). 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 funda-

mental 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 10kΩ 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.

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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