MIC2155 datasheet(4/33 Pages) MICREL

4 / 33 page

Micrel, Inc.

MIC2155/2156

May 2009

M9999-052709-A

(408) 944-0800

Pin Configuration

BST1

HSD1

SW1

CS1

EN2

COMP1

FB1

HSD2

SW2

N/C

VIN2

VOUT

COMP2

FB2

EA2+

32-Pin MLF

® (ML)

Pin Description

Pin Number

Pin Name

Pin Function

BST1

Boost1 (Input): Provides voltage for high-side MOSFET driver 1. The gate drive

voltage is higher than the source voltage by VDD minus a diode drop.

HSD1

High-Side Drive 1 (Output): High current output-driver for external. high-side

MOSFET.

SW1

Switch Node 1 (Output): Return for HSD1

CS1

Current Sense (Input). Current-limit comparator noninverting input. Current is

sensed across the side 1 low-side FET during the off-time. Current limit is set by

the resistor in series with the CS1 pin.

EN2

Enable 2 (Input): Channel 2 enable. Pull high to enable. Pull low to disable.

Soft Start (Input): Controls the turn-on time of the output voltage. Active at

Power-up, Enable, & Current Limit recovery.

COMP1

Compensation 1 (Input): Output of the internal error amplifier for Channel 1.

FB1

Feedback 1 (Input): Negative input to the error amplifier of Channel 1.

DIFFOUT

Output of remote sense differential amplifier.

RMVOUT

Remote VOUT: Connect to Vout at the remote sense point. Input to precision

differential amplifier.

RMGND

Remote Ground: Connect to Ground at the remote sense point. Input to

precision differential amplifier.

AGND

Analog Ground

AVDD

Analog supply voltage (input). Connect to VDD through an RC filter network

N/C

No Connect

SYNC

Sync (Input) : Synchronizes switching to an external source. Leave floating when

not used.

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