SC4612H

7

Pin Descriptions

Pin #

MLPD

Pin #

SOIC

Pin Name

Pin Function

,7

NC

No Connection



2

ILIM

This pin can be used to modify the current limit threshold for the low side MOSFET R

DS(ON)

sensing. Once the voltage drop across the bottom MOSFET is larger than the pro-

grammed value, current limit condition occurs, and the hiccup current limit protection is

activated.

2

3

OSC

Oscillator Frequency set pin. An external capacitor to GND will program the oscillator

frequency. See Table  “Frequency vs. C OSC “ to determine oscillator frequency.

3

4

SS/EN

Soft Start pin. Internal current source connected to a single external capacitor will deter-

mine the soft-start duration for the output. Inhibits the chip if pulled down.

4

5

EAO

Error Amplifier Output. A compensation network is connected from this pin to FB.

5

8

FB

The inverting input of the error amplifier, used to sense the output voltage via a resistive

divider.

6

6

VDD

Main IC supply.

7

9

GND

Ground.

8

0

DL

Drive Low. Gate drive for the bottom MOSFET.

9



DRV

DRV supplies the external MOSFETs gate drive and the some internal circuitry. This pin

should be bypassed with a ceramic capacitor to GND. DRV is internally regulated from

the external supply connected to VDD. If VDD is below0V, the supply should be directly

connected to the DRV pin.

0

2

BST

Supply for high side driver; can be directly connected to an external supply or to a boot-

strap circuit.



3

DH

Drive High. Gate drive for the top MOSFET.

2

4

PHASE

The return path for the high side gate drive, also used to sense the voltage at the phase

node for adaptive gate drive protection and the low-side R

X

N/A

THERMAL PAD (GND)

Pad for heatsinking purposes. Connect to ground plane using multiple vias.