Bel Fuse Inc. 206 Van Vorst Street, Jersey City, NJ 07302

• Tel 201-432-0463 • Fax 201-432-9542 • www.belfuse.com

NON-ISOLATED DC/DC CONVERTERS

12V Input / Programmable Output / VRM11 Compatible

Signal Definitions

Symbol

Definitions

VIN

Input power to the converter

GND

Common return for both input and output

VID0, VID1,

VID2, VID3,

VID4, VID5

VID6

Logic level inputs used to set the output voltage, refer to VID table. Connect VID0 thru

VID6 pins to open-drain outputs with external pull-up resistors. Valid logic low is -0.3V to

0.4V, valid logic high level is 0.8V to 5.5V.

VIDSEL

Digital input used to select between extended VR10 and VR11 VID tables.

PWRGD

The open drain power good signal indicates the output voltage is within 10% of the VID

setpoint.

+SENSE

-SENSE

Remote voltage sense lines. Connect these at the point of load, to VOUT and GND

respectively.

VOUT

Output voltage available to the load.

OUTEN

Logic level input used to enable the converter when high. Valid logic low is -0.3V to 0.4V,

valid logic high level is 0.8V to 5.5V.

LL0/LL1

Load line select pins. Working in conjunction with VID_Select, LL0/LL1 are used to select

load line slope. Currently only 1.25mohm slope is supported. Module can be configured

to support multiple load line slopes.

IMON

Analog average load current signal, scaling TBD.

VBIAS

3.3V Bias input. 3.1 – 3.5V, 200mA max, required for operation of unit.

VR_HOT

Open-drain output signal, pulled actively low indicating a thermal event has been

detected on the VRM

VRM_PRES Signal used by system to indicate the VRM is present in the design.

LPL

Low Power Lockout. This signal has a 10k pull-down resistor internal to the VRM. The

application board ties this signal to OUTEN, so the VRM will turn on only when plugged

into a socket with this configuration. LPL and OUTEN are AND’ed in the VRM, both must

be logic high in order for the VRM output to be enabled.