5 Pin Configuration and Functions

4

2

7

3

5

1

6

8

N.C

VS

GATE

VCAP

SRC

EN/UVLO

GND

OV

Figure 5-1. DDF Package 8-Pin SOT-23 LM74502, LM74502H Top View

Table 5-1. LM74502, LM74502H Pin Functions

PIN

I/O(1)

DESCRIPTION

NO.

NAME

1

EN/UVLO

I

EN/UVLO Input. Connect to VS pin for always ON operation. Can be driven externally from

a micro controller I/O. Pulling the pin low below V(ENF) makes the device enter into low

Iq shutdown mode. For UVLO, connect an external resistor ladder from input supply to EN/

UVLO to ground.

2

GND

G

Ground pin

3

N.C

—

No connection

4

VCAP

O

Charge pump output. Connect to external charge pump capacitor.

5

VS

I

Input power supply pin to the controller. Connect a 100-nF capacitor across VS and GND

pins.

6

GATE

O

Gate drive output. Connect to gate of the external N-channel MOSFET.

7

OV

I

Adjustable overvoltage threshold input. Connect a resistor ladder from input supply to OV

pin to ground. When the voltage at OV pin exceeds the overvoltage cutoff threshold then the

GATE is pulled low. GATE turns ON when the OV pin voltage goes below the OVP falling

threshold. Connect OV pin to ground when OV feature is not used.

8

SRC

I

Source pin. Connect to common source point of external back-to-back connected N-channel

MOSFETs or the source pin of the high side switch MOSFET.

(1)

I = Input, O = Output, G = GND

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LM74502, LM74502H

SNOSDE5A – DECEMBER 2021 – REVISED MAY 2022

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Product Folder Links: LM74502 LM74502H