LM5145 datasheet(7/67 Pages) TI1

7 / 67 page

LM5145

www.ti.com

SNVSAI4 – JUNE 2017

Product Folder Links: LM5145

Submit Documentation Feedback

(1)

Recommended Operating Conditions are conditions under which the device is intended to be functional. For specifications and test

conditions, see Electrical Characteristics.

7.3 Recommended Operating Conditions

Over the recommended operating junction temperature range of –40°C to 125°C (unless otherwise noted).

(1)

MIN

NOM

MAX

UNIT

Input voltages

VIN

–1

ILIM

–1

External VCC bias rail

EN/UVLO

Output voltages

BST

–0.3

BST to VCC

BST to SW

PGOOD

ISINK,

ISRC

Sink/source currents

SYNCOUT

–1

PGOOD

Operating junction temperature

–40

125

°C

(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)

LM5145

UNIT

RGY (VQFN)

20 PINS

RθJA

Junction-to-ambient thermal resistance

36.8

°C/W

RθJC(top)

Junction-to-case (top) thermal resistance

°C/W

RθJB

Junction-to-board thermal resistance

11.8

°C/W

ψJT

Junction-to-top characterization parameter

0.4

°C/W

ψJB

Junction-to-board characterization parameter

11.7

°C/W

RθJC(bot)

Junction-to-case (bottom) thermal resistance

2.1

°C/W

(1)

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

applying statistical process control.

(2)

The junction temperature (TJ in °C) is calculated from the ambient temperature (TA in °C) and power dissipation (PD in Watts) as follows:

TJ = TA + (PD • RθJA) where RθJA (in °C/W) is the package thermal impedance provided in Thermal Information.

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

(1) (2)

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

1.8

2.1

IQ-STBY

Standby input current

VEN/UVLO = 1 V

1.75

IQ-SDN

Shutdown input current

VEN/UVLO = 0 V, VVCC < 1 V

13.5

µA

VCC REGULATOR

VVCC

VCC regulation voltage

VSS/TRK = 0 V, 9 V ≤ VVIN ≤ 75 V,

0 mA < IVCC ≤ 20 mA

7.3

7.5

7.7

VVCC-LDO

VIN to VCC dropout voltage

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

0.25

0.63

ISC-LDO

VCC short-circuit current

VSS/TRK = 0 V, VVCC = 0 V

VVCC-UV

VCC undervoltage threshold

VVCC rising

4.8

4.93

5.2

VVCC-UVH

VCC undervoltage hysteresis

Rising threshold – falling threshold

0.26

LM5145 Datasheet(PDF) 7 Page - Texas Instruments

LM5145 Datasheet(HTML) 7 Page - Texas Instruments

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67

Datasheet Download

Link URL