LM5145 datasheet(7/60 Pages) TI1

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7.3 Recommended Operating Conditions (continued)

Over the recommended operating junction temperature range of –40°C to 150°C (unless otherwise noted). Parameters are

not tested.

MIN

NOM

MAX

UNIT

SYNCOUT

Source/sink currents

–1

I-PGOOD

PGOOD sink current

Operating junction temperature

–40

125

°C

7.4 Thermal Information

THERMAL METRIC(1)

20-PIN

UNIT

VQFN

RθJA

Junction-to-ambient thermal resistance

36.8

°C/W

RθJC(top)

Junction-to-case (top) thermal resistance

RθJB

Junction-to-board thermal resistance

11.8

ΨJT

Junction-to-top characterization parameter

0.4

ΨJB

Junction-to-board characterization parameter

11.7

RθJC(bot)

Junction-to-case (bottom) thermal resistance

2.1

(1)

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

7.5 Electrical Characteristics

Typical values correspond to TJ = 25°C. Minimum and maximum limits apply over the –40°C to 150°C junction temperature

range unless otherwise stated. VVIN = 48 V, VEN/UVLO = 1.5 V, RRT = 25 kΩ unless otherwise stated

PARAMETER

TEST CONDITIONS

MIN

TYP

MAX

UNIT

INPUT SUPPLY

VIN

Operating input voltage range

IQ-RUN

Operating input current, not switching

VEN/UVLO = 1.5 V, VSS/TRK = 0 V

IQ-STBY

Standby input current

VEN/UVLO = 1 V

IQ-SHDN

Shutdown input current

VEN/UVLO = 0 V, VVCC < 1 V

µA

VCC REGULATOR

VVCC

VCC regulation voltage

VSS/TRK = 0 V, 9 V < VVIN < 48 V, 0 mA

< IVCC < 20 mA

7.5

VVCC-LDO

VIN to VCC dropout voltage

VVIN = 6 V, VSS/TRK = 0 V, IVCC = 20

0.25

0.72

ISC-LDO

VCC short-circuit current

VSS/TRK = 0 V, VVCC = 0 V

VVCC-UV

VCC undervoltage threshold

VCC rising

4.8

4.93

5.2

VVCC-UVH

VCC undervoltage hysteresis

Rising threshold – falling threshold

0.26

VVCC-EXT

Minimum external bias voltage

Voltage required to disable VCC

regulator

IVCC

External VCC input current, not

switching

VSS/TRK = 0 V, VVCC = 13 V

2.3

ENABLE AND INPUT UVLO

VSHDN

Shutdown to standby threshold

VEN/UVLO rising

0.42

VSHDN-HYS

Shutdown threshold hysteresis

EN/UVLO Rising threshold – falling

threshold

VEN

Standby to operating threshold

VEN/UVLO rising

1.164

1.2

1.236

IEN-HYS

Standby to operating hysteresis

current

VEN/UVLO = 1.5 V

µA

ERROR AMPLIFIER

VREF

FB reference Voltage

FB connected to COMP

792

800

808

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LV5144

SNVSCJ1 – AUGUST 2023

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