6.4 Thermal Information

THERMAL METRIC(1)

LM5176

UNIT

PWP (HTSSOP)

RHF (QFN)

28 PINS

RθJA

Junction-to-ambient thermal resistance

32.6

34.7

°C/W

RθJC(top) Junction-to-case (top) thermal resistance

21.4

26.6

°C/W

RθJB

Junction-to-board thermal resistance

8.2

6.3

°C/W

ψJT

Junction-to-top characterization parameter

0.3

0.3

°C/W

ψJB

Junction-to-board characterization parameter

8.3

6.2

°C/W

RθJC(bot) Junction-to-case (bottom) thermal resistance

1

2.0

°C/W

(1)

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

report.

6.5 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)

IQ

VIN shutdown current

VEN/UVLO = 0 V

2.6

10

µA

VIN operating current

VEN/UVLO = 2 V, VFB = 0.9 V

2

4

mA

VCC

VVCC(VIN)

Regulation voltage

VBIAS = 0 V, VCC open

6.95

7.35

7.88

V

VUV(VCC)

VCC undervoltage lockout

VCC increasing

3.11

3.27

3.43

V

Undervoltage hysteresis

176

mV

IVCC

VCC current limit

VVCC = 0 V

65

mA

ROUT(VCC)

VCC regulator output impedance

IVCC = 30 mA, VIN = 4 V

8

16

Ω

BIAS

VBIAS(SW)

BIAS switchover voltage

VIN = 24 V

7.25

8

8.75

V

EN/UVLO

VEN(STBY)

Standby threshold

EN/UVLO rising

0.55

0.82

0.97

V

IEN(STBY)

Standby source current

VEN/UVLO = 1.1 V

1

2

3

µA

VEN(OP)

Operating threshold

EN/UVLO rising

1.17

1.22

1.29

V

ΔIHYS(OP)

Operating hysteresis current

VEN/UVLO = 1.5 V

2.15

3.15

4.25

µA

SS

ISS

Soft-start pullup current

VSS = 0 V

3.75

5

6.35

µA

VSS(CL)

SS clamp voltage

SS open

1.21

V

VFB - VSS

FB to SS offset

VSS = 0 V

–18

mV

EA (ERROR AMPLIFIER)

VREF

Feedback reference voltage

FB = COMP

0.788

0.800

0.812

V

gmEA

Error amplifier gm

1.31

mS

ISINK/ISOURCE

COMP sink/source current

VFB=VREF ± 300 mV

280

µA

ROUT

Amplifier output resistance

20

MΩ

BW

Unity gain bandwidth

2

MHz

IBIAS(FB)

Feedback pin input bias current

FB in regulation

25

nA

FREQUENCY

fSW(1)

Switching frequency 1

RT = 40 kΩ

175

200

225

kHz

fSW(2)

Switching frequency 2

RT = 20 kΩ

350

390

430

LM5176

SNVSAI1D – JUNE 2017 – REVISED AUGUST 2021

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