Limits apply over the recommended operating junction temperature (TJ) range of –40°C to +125°C, unless

otherwise stated. Minimum and maximum limits are specified through test, design or statistical correlation.

Typical values represent the most likely parametric norm at TJ = 25°C, and are provided for reference purposes

only. Unless otherwise stated, the following conditions apply: VIN = 24 V, VOUT = 3.3 V, fSW = 400 kHz.

PARAMETER

TEST CONDITIONS

MIN

TYP

MAX

UNIT

HIGH SIDE DRIVER (BOOT PIN)

VBOOT_UVLO

BOOT - SW undervoltage

lockout

1.6

2.2

2.7

V

CURRENT LIMITS AND HICCUP

IHS_LIMIT(2)

Short-circuit, high-side

current limit

6.0

6.8

7.8

A

ILS_LIMIT (2)

Low-side current limit

4.5

5.1

5.8

A

INEG_LIMIT

Negative current limit

–4.1

A

VHICCUP

Hiccup threshold on FB pin

0.38

0.42

0.46

V

IL_ZC

Zero cross-current limit

0.05

A

SOFT START (SS/TRK PIN)

ISSC

Soft-start charge current

1.8

2

2.2

µA

RSSD

Soft-start discharge

resistance

UVLO, TSD, OCP; or EN = 0 V

2

kΩ

POWER GOOD (PGOOD PIN) and OVERVOLTAGE PROTECTION

VPGOOD_OV

Power-good overvoltage

threshold

% of FB voltage

106%

110%

113%

VPGOOD_UV

Power-good undervoltage

threshold

% of FB voltage

86%

90%

93%

VPGOOD_HYS

Power-good hysteresis

% of FB voltage

2.5%

VPGOOD_VALID

Minimum input voltage for

proper PGOOD function

50-µA pullup to PGOOD pin, VEN = 0 V

1.3

2

V

RPGOOD

Power-good on-resistance

VEN = 2.5 V

40

100

Ω

VEN = 0 V

30

90

MOSFETS

RDS_ON_HS (3)

High-side MOSFET on-

resistance

IOUT = 1 A, VBIAS = VOUT = 3.3 V

95

150

mΩ

RDS_ON_LS (3)

Low-side MOSFET on-

resistance

IOUT = 1 A, VBIAS = VOUT = 3.3 V

45

85

mΩ

THERMAL SHUTDOWN

TSD (4)

Thermal shutdown threshold Shutdown threshold

150

°C

Recovery threshold

135

°C

(1)

Shutdown current includes leakage current of the switching transistors.

(2)

This current limit was measured as the internal comparator trip point. Due to inherent delays in the current limit comparator and

drivers, the peak current limit measured in closed loop with faster slew rate will be larger, and valley current limit will be lower.

(3)

Measured at pins.

(4)

Ensured by design.

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LM76005

SNVSBK5A – FEBRUARY 2020 – REVISED JULY 2020

Copyright © 2020 Texas Instruments Incorporated

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