Rev. 1.20

3

June 01, 2017

HT7991

Pin Assignment

Top View

SOT23-6

7991

6

54

3

2

1

Pin Description

Pin Order

Name

Type

Pin Description

1

LX

O

Power switch output

2

GND

G

Ground terminal

3

FB

I

Error amplifier inverting input

4

EN

I

Enable control - High active

5

VIN

P

Power supply input

6

OC

I

Adjustment current limit via an external resistor to ground

Absolute Maximum Ratings

Parameter

Value

Unit

VIN

-0.3 to +6

V

LX

-0.3 to +17

V

Other Pins

+6

V

Power Dissipation

455

mW

Maximum Junction Temperature

+150

°C

Storage Temperature Range

-65 to +150

°C

Lead Temperature (Soldering 10sec)

+260

°C

ESD Susceptibility

Human Body Model

2000

V

Machine Model

200

V

220

°C/W

Recommended Operating Range

Parameter

Value

Unit

VIN

2.6 to 5.5

V

Operating Temperature Range

-40 to +85

°C

NotethatAbsoluteMaximumRatingsindicatelimitationsbeyondwhichdamagetothedevicemayoccur.

RecommendedOperatingRatingsindicateconditionsforwhichthedeviceisintendedtobefunctional,butdonot

guaranteespecifiedperformancelimits.