MIC25400 datasheet(3/27 Pages) MICREL

3 / 27 page

Micrel, Inc.

MIC25400

January 2011

M9999-020111-C

Pin Number

Pin Name

Pin Description

EN/DLY2

Enable/Delay 2 (Input): This pin can be used to disable VOUT2. When

used to disable VOUT2, this pin must be pulled down to ground in less

than 1µs for proper operation. It is also used for soft-start of the

output. Soft start capacitor range is 4.7nf to 22nf. See Functional

Description section for additional information.

PG2

Power Good 2 (Output) Open drain. Device is in the OFF state. i.e.,

high when output is within 90% of regulation

CS2

Current Sense 2 (Input) Place a resistor from SW2 to this pin to

program the current limit point from 0.5A to 2.7A

PGND2

Power Ground 2 (Input)

LSD2

Low-side Drive 2 (Output): External low-side N-Channel MOSFET

driver. Use 4.5V rated MOSFETs.

BST2

Boost 2 (Input): Provides voltage for high-side internal MOSFET for

Channel 2. Connect a 0.01µF capacitor from SW2 to BST2 pin and a

diode-to-PVDD.

SW2

Switch Node 2 (Output): Source of internal high-side power MOSFET.

VIND2

Supply voltage (Input): For the drain of internal high-side power

MOSFET 4.5V to 13.2V.

PVDD

5V Internal Linear Regulator (Output): PVDD is the external MOSFET

gate drive for LSD1 and LSD2 and an internal supply bus for the IC.

Connect to an external 1µF bypass capacitor. When VIN is <6V, this

regulator operates in drop-out mode. Connect VDD to VIN when VIN

<6V.

VIN

Supply voltage (Input): For the internal 5V linear regulator. 4.5V to

13.2V.

VIND1

Supply voltage (Input): For the drain of internal high-side power

MOSFET 4.5V to 13.2V.

SW1

Switch Node 1 (Output): Source of internal high-side power MOSFET.

GND

Exposed thermal pad for package only. Connect to ground. Must

make a full connection to the ground plane to maximize thermal

performance of the package.

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