MAX17633 datasheet(4/23 Pages) MAXIM

4 / 23 page

(VIN = VEN/UVLO = 24V, RRT = unconnected (fSW = 500 kHz), CINTVCC = 2.2μF, VSGND = VPGND = VMODE/SYNC = VEXTVCC = 0V;

VFB = 3.67V (MAX17633A), VFB = 5.5V (MAX17633B), VFB = 1V (MAX17633C), 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

Charging Current

ISS

4.7

5.3

μA

FB Regulation Voltage

VFB_REG

MODE/SYNC = SGND or MODE/SYNC =

INTVCC (MAX17633A)

3.256

3.3

3.344

MODE/SYNC = SGND or MODE/SYNC =

INTVCC (MAX17633B)

4.94

5.06

MODE/SYNC = SGND or MODE/SYNC =

INTVCC (MAX17633C)

0.888

0.9

0.912

MODE/SYNC = OPEN (MAX17633A)

3.256

3.36

3.44

MODE/SYNC = OPEN (MAX17633B)

4.94

5.09

5.21

MODE/SYNC = OPEN (MAX17633C)

0.888

0.915

0.938

FB Input-Bias Current

IFB

For MAX17633A

μA

For MAX17633B

For MAX17633C, TA = +25°C

-50

+50

MODE/SYNC

MODE Threshold

VM_DCM

MODE/SYNC = INTVCC (DCM Mode)

VIN_VCC - 0.65

VM_PFM

MODE/SYNC = OPEN (PFM Mode)

VIN_VCC /2

VM_PWM

MODE/SYNC = SGND (PWM Mode)

0.75

SYNC Frequency-Capture

Range

fSYNC

fSW set by RRT

1.1 × fSW

1.4 × fSW kHz

SYNC Pulse Width

SYNC Threshold

VIH

2.1

VIL

0.8

CURRENT LIMIT

Peak Current-Limit

Threshold

IPEAK_LIMIT

4.6

5.4

6.2

Runaway Current-Limit

Threshold

IRUNAWAY_LIMIT

5.35

6.4

7.35

PFM Current-Limit

Threshold

IPFM

MODE/SYNC = OPEN

1.2

Valley Current-Limit

Threshold

IVALLEY_LIMIT

MODE/SYNC = OPEN or MODE/SYNC =

INTVCC

-0.28

+0.28

MODE/SYNC = GND

2.5

Electrical Characteristics (continued)

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Maxim Integrated │ 4

MAX17633

4.5V to 36V, 3.5A, High Efficiency,

Synchronous Step-Down, DC-DC Converter

MAX17633 Datasheet(PDF) 4 Page - Maxim Integrated Products

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