LM5176PWPR datasheet(6/37 Pages) TI1

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LM5176

SNVSAI1 – JUNE 2017

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(1)

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

report.

7.4 Thermal Information

THERMAL METRIC(1)

LM5176

UNIT

PWP (HTSSOP)

28 PINS

RθJA

Junction-to-ambient thermal resistance

32.6

°C/W

RθJC(top)

Junction-to-case (top) thermal resistance

21.4

RθJB

Junction-to-board thermal resistance

8.2

ψJT

Junction-to-top characterization parameter

0.3

ψJB

Junction-to-board characterization parameter

8.3

RθJC(bot)

Junction-to-case (bottom) thermal resistance

1.0

(1)

All minimum and maximum limits are specified by correlating the electrical characteristics to process and temperature variations and

applying statistical process control.

7.5 Electrical Characteristics

Typical values correspond to TJ = 25°C. Minimum and maximum limits apply over the –40°C to 125°C junction temperature

range unless otherwise stated. VIN = 24 V unless otherwise stated.

(1)

PARAMETER

TEST CONDITION

MIN

TYP

MAX

UNIT

SUPPLY VOLTAGE (VIN)

VIN shutdown current

VEN/UVLO = 0 V

2.6

µA

VIN operating current

VEN/UVLO = 2 V, VFB = 0.9 V

VCC

VVCC(VIN)

Regulation voltage

VBIAS = 0 V, VCC open

6.95

7.35

7.88

VUV(VCC)

VCC Undervoltage lockout

VCC increasing

3.11

3.27

3.43

Undervoltage hysteresis

176

IVCC

VCC current limit

VVCC = 0 V

ROUT(VCC)

VCC regulator output impedance

IVCC = 30 mA, VIN = 4 V

BIAS

VBIAS(SW)

BIAS switchover voltage

VIN = 24 V

7.25

8.75

EN/UVLO

VEN(STBY)

Standby threshold

EN/UVLO rising

0.55

0.82

0.97

IEN(STBY)

Standby source current

VEN/UVLO = 1.1 V

µA

VEN(OP)

Operating threshold

EN/UVLO rising

1.17

1.22

1.29

ΔIHYS(OP)

Operating hysteresis current

VEN/UVLO = 1.5 V

2.15

3.15

4.25

µA

ISS

Soft-start pull up current

VSS = 0 V

3.75

6.35

µA

VSS(CL)

SS clamp voltage

SS open

1.21

VFB - VSS

FB to SS offset

VSS = 0 V

-18

EA (ERROR AMPLIFIER)

VREF

Feedback reference voltage

FB = COMP

0.788

0.800

0.812

gmEA

Error amplifier gm

1.31

ISINK/ISOURCE

COMP sink/source current

VFB=VREF ± 300 mV

280

µA

ROUT

Amplifier output resistance

Ω

Unity gain bandwidth

MHz

IBIAS(FB)

Feedback pin input bias current

FB in regulation

FREQUENCY

fSW(1)

Switching Frequency 1

RT = 40 k

Ω

175

200

225

kHz

fSW(2)

Switching Frequency 2

RT = 20 k

Ω

350

390

430

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