IR3638

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3

Table 1. PIN FUNCTION DESCRIPTION

Pin

Name

Description

1

FB

Inverting input to the error amplifier. This pin is connected to the output of the regulator via resistor divider

to set the output voltage and provide feedback to the error amplifier.

2

VP/EN

Dual function pin. Non inverting input to the error amplifier. Enable input.

3

NC

No Connect

4

VCC

This pin provides power for the internal blocks of the IC as well as powers the low side driver. A minimum

of 0.1 mF, high frequency capacitor must be connected from this pin to power ground.

5

NC

No Connect

6

LDRV

Output driver for low side MOSFET.

7

GND

IC ground for internal control circuitry.

8

PGND

Power Ground. This pin serves as a separate ground for the MOSFET drivers and should be connected to

the system’s power ground plane.

9

HDRV

Output driver for high side MOSFET. The negative voltage at this pin may cause instability for the gate

drive circuit. To prevent this, a low forward voltage drop diode (e.g. BAT54 or 1N4148) is required

between this pin and Power Ground.

10

VC

This pin powers the high side driver.

11

NC

No Connect

12

COMP

Output of error amplifier. An external resistor and capacitor network is typically connected from this pin to

ground to provide loop compensation.

13

SS

Soft start. This pin provides user programmable soft−start function. Connect an external capacitor from

this pin to ground to set the start up time of the output voltage.

14

NC

No Connect

Table 2. ABSOLUTE MAXIMUM RATINGS

Rating

Symbol

min

max

Unit

Main Supply Voltage Input

−0.3

20

V

Main Supply Voltage Input

200 ns wide spikes, 400 kHz

−0.3

22

V

Supply Voltage for the High side driver

−0.3

20

V

Supply Voltage for the High side driver 200 ns wide spikes, 400 kHz

−0.3

22

V

VP/EN pin Voltage

−0.3

V

FB pin Voltage

−0.3

V

Rating

Symbol

Value

Unit

Thermal Resistance, Junction−to−Ambient (Note 2)

90

K/W

Storage Temperature Range

−65 to 150

°C

Junction Operating Temperature

0 to 150

°C

ESD Withstand Voltage (Note 3)

Human Body Model

Machine Model

2.0

200

kV

V

Moisture Sensitivity Level

MSL

JEDEC Level 1 @ 260°C

Stresses exceeding Maximum Ratings may damage the device. Maximum Ratings are stress ratings only. Functional operation above the

Recommended Operating Conditions is not implied. Extended exposure to stresses above the Recommended Operating Conditions may affect

device reliability.

NOTE: All voltages are referenced to GND pin unless otherwise stated.

2. JEDEC High−K model

3. This device series contains ESD protection and exceeds the following tests:

Human Body Model (HBM) ±2.0 kV per JEDEC standard: JESD22−A114

Machine Model (MM) ±200 V per JEDEC standard: JESD22−A115