LM27402 datasheet(5/48 Pages) TI

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LM27402

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SNVS615J – JANUARY 2010 – REVISED JULY 2015

6.3 Recommended Operating Conditions

MIN

MAX UNIT

VDD powered by internal LDO

3.0

VIN(1)

VDD tied to VIN

3.0

5.5

VDD

2.2

5.5

SS/TRACK, SYNC, EN

VVDD

PGOOD

5.5

Junction Temperature

–40

125

°C

(1)

VDD is the output of an internal linear regulator. Under normal operating conditions where VIN is greater than 5.5 V, VDD must not be

connected to any external voltage source. In an application where VIN is between 3.0 V and 5.5 V, connecting VIN to VDD maximizes

the bias supply rail voltage. In order to have better noise rejection under these conditions, a 1-

Ω and 1-µF RC input filter to VDD may be

used.

6.4 Thermal Information

LM27402

THERMAL METRIC(1)

RUM (WQFN)

PWP (HTSSOP)

UNIT

16 PINS

RθJA

Junction-to-ambient thermal resistance

35.3(2)

39.8(2)

°C/W

RθJC(top)

Junction-to-case (top) thermal resistance

32.7

25.6

°C/W

RθJB

Junction-to-board thermal resistance

12.9

18.8

°C/W

ψJT

Junction-to-top characterization parameter

0.3

0.7

°C/W

ψJB

Junction-to-board characterization parameter

13.0

18.6

°C/W

RθJC(bot)

Junction-to-case (bottom) thermal resistance

3.3

2.5

°C/W

(1)

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

report, SPRA953.

(2)

Tested on a four layer JEDEC board. Four vias are provided under the WQFN exposed pad and nine vias are provided under the

HTSSOP exposed pad.

6.5 Electrical Characteristics

Unless otherwise stated, the following conditions apply: VVIN = 12 V. Limits in standard type are for TJ = 25°C only. Minimum

and maximum limits are specified through test, design, or statistical correlation. Typical values represent the most likely

parametric norm at TJ = 25°C and are provided for reference purposes only.

PARAMETER

TEST CONDITIONS

MIN

TYP

MAX

UNIT

OPERATIONAL SPECIFICATIONS

VFB = 0.6 V (not switching), TJ = 25°C

4.5

Quiescent Current

VFB = 0.6 V (not switching), TJ = –40°C

to +125°C

VEN = 0 V, TJ = 25°C

IQSD

Quiescent Current In Shutdown

µA

VEN = 0 V, TJ = –40°C to +125°C

UVLO

VVIN Rising, VVDD Rising, TJ = 25°C

2.9

UVLO

Input Under Voltage Lockout

VVIN Rising, VVDD Rising, TJ = –40°C to

2.7

2.99

+125°C

UVLOHYS

UVLO Hysteresis

VVIN Falling, VVDD Falling

300

REFERENCE

TJ = 25°C

0.600

VFB

Feedback Voltage

TJ = –40°C to +125°C

0.594

0.606

IFB

Feedback Pin Bias Current

VFB = 0.65 V

–50

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