MAX17632 datasheet(4/24 Pages) MAXIM

4 / 24 page

(VIN = VEN/UVLO = 24V, RRT = unconnected (fSW = 400 kHz), CVCC = 2.2μF, VMODE/SYNC = VEXTVCC = VSGND = VPGND = 0V,

VFB = 3.67V (MAX17632A), VFB = 5.5V (MAX17632B), VFB = 1V (MAX17632C), LX = SS = RESET = Open, VBST to VLX = 5V,

TA = -40°C to 125°C, unless otherwise noted. Typical values are at TA = +25°C. All voltages are referenced to SGND, unless otherwise

noted.) (Note 3 )

PARAMETER

SYMBOL

CONDITIONS

MIN

TYP

MAX

UNITS

MODE/SYNC

MODE Threshold

VM-DCM MODE/SYNC = VCC (DCM mode)

VCC -

0.65

VM-PFM MODE/SYNC = Open (PFM mode)

VCC/2

VM-PWM MODE/SYNC = SGND (PWM mode)

0.75

SYNC Frequency-Capture

Range

fSYNC

fSW set by RRT

1.1 x fSW

1.4 x fSW

kHz

SYNC Pulse Width

SYNC Threshold

VIH

2.1

VIL

0.8

CURRENT LIMIT

Peak Current-Limit

Threshold

IPEAK-

LIMIT

2.7

3.15

3.6

Runaway Peak Current-

Limit Threshold

IRUNAWAY-

LIMIT

3.6

4.1

PFM Peak Current-Limit

Threshold

IPFM

MODE/SYNC = Open

0.8

Valley Current-Limit

Threshold

IVALLEY-

LIMIT

MODE/SYNC = Open or MODE/SYNC =

VCC

-0.15

+0.15

MODE/SYNC = SGND, VFB > 0.65

-1.8

Switching Frequency

fSW

RRT = 50.8kΩ

380

400

420

kHz

RRT = 40.2kΩ

475

500

525

RRT = 8.06kΩ

1950

2200

2450

RRT = Open

370

400

430

VFB Undervoltage Trip

Level to Cause Hiccup

VFB-HICF

For MAX17632A

2.05

2.13

2.2

For MAX17632B

3.11

3.22

3.33

For MAX17632C

0.56

0.58

0.6

HICCUP Timeout

(Note 4)

32768

Cycles

Minimum On-Time

tON-MIN

Minimum Off-Time

tOFF-MIN

140

160

LX Dead Time

LXDT

Electrical Characteristics (continued)

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Maxim Integrated │ 4

MAX17632

4.5V to 36V, 2A, High-Efficiency,

Synchronous Step-Down DC-DC Converter

MAX17632 Datasheet(PDF) 4 Page - Maxim Integrated Products

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