LM5145 datasheet(12/69 Pages) TI

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Over the recommended operating junction temperature range of –40°C to 150°C (unless otherwise noted), typical values

correspond to TJ = 25℃, VVIN = 12 V, VVCCX = 5 V, VVOUT1 = 3.3 V, VVOUT2 = 5 V, VEN1 = VEN2 = 5 V, RRT = 10 kΩ, FSW = 2.2

MHz, no load on the drive outputs (HO1, HOL1, LO1, LOL1, HO2, HOL2, LO2, and LOL2).

PARAMETER

TEST CONDITIONS

MIN

TYP

MAX

UNIT

tAWAKE-FILTER

Maximum SYNC period to maintain

standby state

VEN1 = VEN2 = 0 V

µs

SYNCHRONIZATION OUTPUT (SYNCOUT)

VSYNCOUT-LO SYNCOUT low-state voltage

ISYNCOUT = 16 mA

0.8

FSYNCOUT

SYNCOUT frequency

MODE = FB2 = VDDA

tSYNCOUT1

Delay from HO2 rising edge to

SYNCOUT rising edge

VDEMB = 0 V, TS = 1/FSW, FSW set by RRT = 220

kΩ

2.5

µs

tSYNCOUT2

Delay from HO2 rising edge to

SYNCOUT falling edge

VDEMB = 0 V, TS = 1/FSW, FSW set by RRT =

220 kΩ

7.5

µs

DITHER (DITH)

IDITH

Dither source/sink current

µA

VDITH-HIGH

Dither high-level threshold

1.25

VDITH-LOW

Dither low-level threshold

1.15

SOFT START (SS1, SS2)

ISS

Soft-start current

VMODE = 0 V

µA

RSS-PD

Soft-start pulldown resistance

VMODE = 0 V

VSS-FB

SS to FB clamp voltage

VCS – VVOUT > 73 mV

130

ISS-SECOND

SS leakage, secondary mode

VSS = 0.8 V, MODE = FB2 = VDDA

ISS-INTLV

SS2 leakage, interleaved mode

VSS = 0.8 V, MODE = VDDA, VFB2 = 0 V

THERMAL SHUTDOWN

TSHD

Thermal shutdown

175

°C

TSHD-HYS

Thermal shutdown hysteresis

°C

8.6 Switching Characteristics

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

correspond to TJ = 25℃, VVIN = 12 V, VVCCX = 5 V, VVOUT1 = 3.3 V, VVOUT2 = 5 V, VEN1 = VEN2 = 5 V, RRT = 10 kΩ, FSW = 2.2

MHz, no load on the gate driver outputs (HO1, HOL1, LO1, LOL1, HO2, HOL2, LO2, and LOL2).

PARAMETER

TEST CONDITIONS

MIN

TYP

MAX

UNIT

FSW1

Switching frequency 1

RRT = 100 kΩ

195

220

245

kHz

FSW2

Switching frequency 2

RRT = 10 kΩ

2.2

MHz

FSW3

Switching frequency 3

RRT = 220 kΩ

100

kHz

SLOPE1

Internal slope compensation 1

RRT = 10 kΩ

557

mV/µs

SLOPE2

Internal slope compensation 2

RRT = 100 kΩ

mV/µs

tOFF(min)

Minimum off time

105

PHHO1-HO2

Phase between HO1 and HO2

DEMB = MODE = AGND

180

LM25143

SNVSC10 – MARCH 2022

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