Seven-Channel, High Efficiency,

DC-DC Power Management Unit

3

SGM2100

SG Micro Corp

www.sg-micro.com

PIN DESCRIPTION

PIN

NAME

FUNCTION

5

FB1

AUX1 Controller Feedback Input. The feedback threshold is 0.8V. This pin is high impedance in

shutdown.

6

ON1

AUX1 Controller ON/OFF Input. Logic high = ON; however, turn-on is locked out until 1024 OSC

cycles after the step-up has reached regulation. This pin has an internal 475kΩ pull-down resistance to

GND.

7

PGSD

Power Ground. Connect all PGxx_ pins to GND with short wide traces as close to the IC as possible.

8

LXSD

Step-Down Converter Switching Node. Connect to the inductor of the step-down converter. LXSD is

high impedance in shutdown.

9

PVSD

Step-Down Converter Supply Input. Bypass to GND with a 1µF ceramic capacitor. The efficiency of

this channel is measured from this pin.

10

ONSD

Step-Down Converter ON/OFF Control Input. Logic high = ON; however, turn-on is locked out until

1024 OSC cycles after the step-up has reached regulation. This pin has an internal 475kΩ pull-down

resistance to GND.

11

FBSD

Step-Down Converter Feedback Input. The feedback threshold is 0.8V. This pin is high impedance in

shutdown.

12

CCSD

Step-Down Converter Compensation Node. Connect a series resistor-capacitor from this pin to GND

to compensate the control loop of the converter. This pin is actively driven to GND in shutdown,

overload and thermal limit.

13

SUSD

Configures the Main Converter as a Step-Up or a Step-Down. This function must be hardwired.

On-the-fly changes are not allowed. With SUSD connected to PV, the main is configured as a step-up

and PVM is the converter’s output. With SUSD connected to GND, this channel is configured as a

Step-Down, PVM is the Power Source Input Pin of Main Converter.

14

CCM

Main Converter Compensation Node. Connect a series resistor-capacitor from this pin to GND to

compensate the control loop of the converter. This pin is actively driven to GND in shutdown, overload,

and thermal limit.

15

FBM

Main Converter Feedback Input. The feedback threshold is 0.8V. This pin is high impedance in

shutdown. The output voltage must not be set higher than the step-up output.

16

ONM

Main ON/OFF Input. Logic high = ON; however, turn-on is lock out until 1024 OSC cycles after the

step-up has reached regulation. This pin has an internal 475kΩ pull-down resistance to GND.

17

REF

Reference Output. Bypass REF to GND with a 0.1µF or greater capacitor. The maximum allowed REF

load is 200µA. REF is actively pulled to GND when the step-up is shutdown.

18

CCSU

Step-Up Converter Compensation Node. Connect a series resistor-capacitor from this pin to GND to

compensate the control loop of the converter. This pin is actively driven to GND in shutdown, overload,

and thermal limit.

19

FBSU

Step-Up Converter Feedback Input. The feedback threshold is 0.8V. This pin is high impedance in

shutdown.

20

ONSU

Step-Up Converter ON/OFF Input. Logic high = ON; however, turn-on is lock out until 1024 OSC

cycles after the step-up has reached regulation. This pin has an internal 475kΩ pull-down resistance to

GND.