LM5177DCPR datasheet(9/60 Pages) TI2

9 / 60 page

Typical values correspond to TJ=25°C. Minimum and maximum limits apply over TJ=-40°C to 125℃. Unless otherwise stated,

V(BIAS) =12 V

PARAMETER

MIN

TYP

MAX UNIT

VT+(SYNC)

Sync input positive going threshold

1.19

VT-(SYNC)

Sync input negative going threshold

0.41

Sync activity detection frequency

kHz

td(Det,Sync)

Sync activity detection delay

referred to f(SYNC)

cycle

Sync PLL lock time

referred to f(SYNC)

until f(SYNC) - 5% < f(sw)

< f(SYNC) + 5%

cycle

SOFT-START

I(SS)

Soft-start current

8.9

SS pull-down switch RDS(on)

V(SS) = 1 V

td(DISCH;SS) SS Pin discharge time

Time from internal SS

discharge until the soft-

start current can charge

the pin again

500

µs

td(EN_SS)

SS Pin charge delay time

Internal delay until soft-

start current starts

2.5

µs

V(SS,clamp)

Clamp Voltage for SS pin

4.1

5.25

PULSE WIDTH MODULATION

Switching frequency

RRT = 49.9 kΩ

540

600

660 kHz

Switching frequency

RRT = 316 kΩ

100

110 kHz

Minimum controllable on-time

fPWM, RRT = 49.9 kΩ

Boost Mode

154

Buck Mode

197

Minimum controllable off-time

Boost Mode

207

Buck Mode

210

RT regulation voltage

0.75

SPREAD SPECTRUM

Switching frequency modulation range

upper limit

7.8

lower limit

–7.8

VOUT TRACKING

VT+(DTRK)

DTRK positive-going threshold

V(DTRK) rising

1.19

VT-(DTRK)

DTRK negative-going threshold

V(DTRK) falling

0.41

DTRK activity detection frequency

148

kHz

td(Det,DTRK)

DTRK activity detection delay

referred to f(DTRK)

cycle

fc(LPF)

Corner frequency of

internal low pass

58 kHz

V(REF)voltage offset error

f(DTRK) = 500kHz, duty =

50%

±10 mV

MODE SELECTION

VT+(MODE)

Mode input positive going threshold

1.19

VT-(MODE)

Mode input negative going threshold

0.41

CURRENT SENSE

Positive peak

current limit threshold

38.5

58.5 mV

Negative peak current

limit threshold

–61.6

–50

–40.5 mV

PSM entry threshold

PSM ENTRY = 10 %

0.8

5.0

9.7 mV

www.ti.com

LM5177

SNVSBU4F – JUNE 2022 – REVISED JANUARY 2025

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