UCC27531, UCC27533, UCC27536, UCC27537, UCC27538

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SLUSBA7F – DECEMBER 2012 – REVISED JULY 2015

8.3 Recommended Operating Conditions

over operating free-air temperature range (unless otherwise noted)

MIN

NOM

MAX

UNIT

Supply voltage, VDD

10

18

32

V

Operating junction temperature

–40

140

°C

Input voltage, IN, IN+, IN-, IN1, IN2

–5

25

V

Enable, EN

–5

25

V

8.4 Thermal Information

UCC27533,

UCC27531,

UCC27531

UCC27536,

UCC27538

UCC27537

UNIT

DBV

DBV

SOIC

5 PINS

6 PINS

8 PINS

178.3

178.3

129.9

109.7

109.7

79.9

28.3

28.3

68.1

°C/W

14.7

14.7

22.7

27.8

27.8

69.8

(1)

For more information about traditional and new thermal metrics, see the Semiconductor and IC Package Thermal Metrics application

report, SPRA953.

(2)

The junction-to-ambient thermal resistance under natural convection is obtained in a simulation on a JEDEC-standard, high-K board, as

specified in JESD51-7, in an environment described in JESD51-2a.

(3)

The junction-to-case (top) thermal resistance is obtained by simulating a cold plate test on the package top. No specific JEDEC-

standard test exists, but a close description can be found in the ANSI SEMI standard G30-88.

(4)

The junction-to-board thermal resistance is obtained by simulating in an environment with a ring cold plate fixture to control the PCB

temperature, as described in JESD51-8.

(5)

The junction-to-top characterization parameter,

(6)

The junction-to-board characterization parameter,

8.5 Electrical Characteristics

positive into, negative out of the specified terminal. OUTH and OUTL are tied together for UCC27531/8. Typical condition

specifications are at 25°C.

PARAMETER

TEST CONDITIONS

MIN

TYP

MAX

UNIT

BIAS CURRENTS

VDD = 7.0, IN, EN=VDD

100

200

300

Start-up current (UCC25731)

μA

IN, EN = GND

100

217

300

VDD = 7.0, IN+ = GND, IN- = VDD

100

200

300

Start-up current (UCC27533)

μA

IN+ = VDD, IN- = GND

100

217

300

VDD = 7.0, IN- = GND, EN = VDD

100

217

300

Start-up current (UCC27536)

μA

IN- = VDD, EN = GND

100

217

300

VDD =7.0, IN+, EN = VDD

100

200

300

Start-up current (UCC27537)

μA

IN+, EN = GND

100

217

300

VDD = 7.0, IN1, IN2=VDD

100

200

300

Start-up Current (UCC27538)

μA

IN1, IN2=GND

100

200

300

UNDERVOLTAGE LOCKOUT (UVLO)

Supply start threshold

8

8.9

9.8

V

Minimum operating voltage

7.3

8.2

9.1

V

after supply start

Supply voltage hysteresis

0.7

V

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