MIC2155 datasheet(5/33 Pages) MICREL

5 / 33 page

Micrel, Inc.

MIC2155/2156

May 2009

M9999-052709-A

(408) 944-0800

Pin Number

Pin Name

Pin Function

PGOOD

Power Good (Output): Asserts high when voltage on the FB pin rises above

Power Good threshold.

EA2+

(input) Positive input to Channel 2 (current sharing) error amplifier. Connect to

Channel 1 current sense.

FB2

(input) Negatve input to Channel 2 (current sharing) error amplifier. Connect to

Channel 2 current sense.

COMP2

Compensation 2 (Input): Pin for external compensation of Channel 2.

VOUT

Output sense (input): Connect to output side of inductors. Used for current

sharing.

VIN2

(Input) Supply voltage for Channel 2. Used for Channel 2 UVLO circuit.

N/C

No Connect

SW2

Switch node 2 (Output): Return for HSD2.

HSD2

High-Side Drive 2 (Output): High current output-driver for the high-side

MOSFET.

BST2

Boost 2 (Input): Provides voltage for high-side MOSFET driver in Channel 2. The

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

PGND2

Power Ground 2. High current return for low side driver 2.

LSD2

Low-Side Drive 2 (Output): High-current driver output for Channel 2 low-side

external MOSFET.

VDD

5V Internal Linear Regulator from VIN1 (Output): VDD is the ext. MOSFET gate

drive supply voltage and an internal supply bus for the IC. When VIN1 is <5V, this

regulator operates in drop-out mode. Connect external bypass capacitor.

EN1

Enable 1 (Input): Output enable. Turns off both sides. Pull high to enable. Pull

low to disable.

VIN1

Supply voltage Channel 1 (Input): Used for UVLO and VDD circuits.

LSD1

Low-Side Drive 1 (Output): High-current driver output for Channel 1 low-side

external MOSFET.

PGND1

Power Ground 1. High current return for low side driver 1.

EPAD

Exposed Pad (Power) : Must make a full connection to the GND plane to

maximize thermal performance of the package.

MIC2155 Datasheet(PDF) 5 Page - Micrel Semiconductor

MIC2155 Datasheet(HTML) 5 Page - Micrel Semiconductor

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33

Datasheet Download

Link URL