6

LM43602-Q1

SNVSA83C – APRIL 2015 – REVISED OCTOBER 2017

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Copyright © 2015–2017, Texas Instruments Incorporated

Electrical Characteristics (continued)

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 = 12 V, VOUT = 3.3 V, FS = 500 kHz.

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNIT

(1)

Ensured by design.

(2)

Measured at the pins.

VOLTAGE REFERENCE (FB PIN)

VFB

Feedback voltage

TJ = 25ºC

1.012

1.015

1.019

V

TJ = –40ºC to 125 ºC

0.999

1.015

1.032

ILKG-FB

Input leakage current at FB pin

FB = 1.015 V

0.2

65

nA

THERMAL SHUTDOWN

TSD

(1)

Thermal shutdown

Shutdown threshold

160

ºC

Recovery threshold

150

ºC

CURRENT LIMIT AND HICCUP

IHS-LIMIT

Peak inductor current limit

3.65

4.5

5.15

A

ILS-LIMIT

Inductor current valley limit

1.75

2

2.25

A

SOFT START (SS/TRK PIN)

ISSC

Soft-start charge current

1.25

2

2.75

µA

RSSD

Soft-start discharge resistance

UVLO, TSD, OCP, or EN = 0 V

18

kΩ

POWER GOOD (PGOOD PIN)

VPGOOD-HIGH

Power-good flag over voltage tripping

threshold

% of FB voltage

110%

113%

VPGOOD-LOW

Power-good flag under voltage tripping

threshold

% of FB voltage

77%

88%

VPGOOD-HYS

Power-good flag recovery hysteresis

% of FB voltage

6%

RPGOOD

PGOOD pin pulldown resistance when

power bad

VEN = 3.3 V

69

150

Ω

VEN = 0 V

150

350

MOSFETS(2)

RDS-ON-HS

High-side MOSFET ON resistance

IOUT = 1 A

VBIAS = VOUT = 3.3 V

120

mΩ

RDS-ON-LS

Low-side MOSFET ON resistance

IOUT = 1 A

VBIAS = VOUT = 3.3 V

65

mΩ

6.6 Timing Requirements

MIN

NOM

MAX

UNIT

CURRENT LIMIT AND HICCUP

NOC

Hiccup wait cycles when LS current limit tripped

32

Cycles

TOC

Hiccup retry delay time

5.5

ms

SOFT START (SS/TRK PIN)

TSS

Internal soft-start time when SS pin open circuit

4.1

ms

POWER GOOD (PGOOD PIN)

TPGOOD-RISE Power-good flag rising transition deglitch delay

220

µs

TPGOOD-FALL Power-good flag falling transition deglitch delay

220

µs