LM5175PWPR datasheet(6/38 Pages) TI1

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LM5175

SNVSA37A – OCTOBER 2015 – REVISED MAY 2016

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(1)

For more information about traditional and new thermal metrics, see the IC Package Thermal Metrics application report, SPRA953.

7.4 Thermal Information

THERMAL METRIC(1)

LM5175

UNIT

HTSSOP

QFN

28 PINS

RθJA

Junction-to-ambient thermal resistance

33.1

34.7

°C/W

RθJC(top)

Junction-to-case (top) thermal resistance

17.7

26.6

RθJB

Junction-to-board thermal resistance

14.9

6.3

ψJT

Junction-to-top characterization parameter

0.4

0.3

ψJB

Junction-to-board characterization parameter

14.7

6.2

RθJC(bot)

Junction-to-case (bottom) thermal resistance

1.1

2.0

(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

Operating input voltage

3.5

VIN shutdown current

VEN/UVLO = 0 V

1.4

µA

VIN standby current

VEN/UVLO = 1.1 V, non-switching

0.7

VIN operating current

VEN/UVLO = 2 V, VFB = 0.9 V

1.65

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

160

IVCC

VCC current limit

VVCC = 0 V

ROUT(VCC)

VCC regulator output impedance

IVCC = 30 mA, VIN = 3.5 V

9.3

BIAS

VBIAS(SW)

BIAS switchover voltage

VIN = 24 V

7.25

8.75

EN/UVLO

VEN(STBY)

Standby threshold

EN/UVLO rising

0.55

0.79

0.97

IEN(STBY)

Standby source current

VEN/UVLO = 1.1 V

µA

VEN(OP)

Operating threshold

EN/UVLO rising

1.17

1.23

1.29

ΔIHYS(OP)

Operating hysteresis current

VEN/UVLO = 2.4 V

1.5

3.5

5.5

µA

ISS

Soft-start pull up current

VSS = 0 V

4.30

5.65

7.25

µA

VSS(CL)

SS clamp voltage

SS open

1.27

VFB - VSS

FB to SS offset

VSS = 0 V

-15

EA (ERROR AMPLIFIER)

VREF

Feedback reference voltage

FB = COMP

0.788

0.800

0.812

gmEA

Error amplifier gm

1.27

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

100

FREQUENCY

fSW(1)

Switching Frequency 1

RT = 133 k

Ω

180

200

220

kHz

fSW(2)

Switching Frequency 2

RT = 47 k

Ω

430

500

565

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