MAX1637EEE datasheet(6/20 Pages) MAXIM

6 / 20 page

Miniature, Low-Voltage,

Precision Step-Down Controller

_______________________________________________________________________________________

____________________________________Typical Operating Characteristics (continued)

(VOUT = 3.3V, TA = +25°C, unless otherwise noted.)

500

µs/div

TIME EXITING SHUTDOWN

(VOUT = 3.3V, ILOAD = 7A)

MAX1637-16

VOUT

1V/div

VSHDN

5V/div

VOUT

100mV/div

VDL

INDUCTOR

CURRENT

-5A

-10A

OVERVOLTAGE-PROTECTION WAVEFORMS

(VIN SHORTED TO VOUT

THROUGH A 0.5

Ω RESISTOR)

MAX1637-17

µs/div

______________________________________________________________Pin Description

High-Side Current-Sense Input

CSH

FUNCTION

NAME

Low-Side Current-Sense Input

CSL

Compensation Pin. Connect a small capacitor to GND to set the integration time constant.

Feedback Input. Connect to center of resistor divider.

Shutdown Control Input. Turns off entire IC. When low, reduces supply current below 0.5µA (typ). Drive with

logic input or connect to RC network between GND and VCC for automatic start-up.

SHDN

Analog Ground

GND

Oscillator Frequency Select and Synchronization Input. Tie to VCC for 300kHz operation; tie to GND for

200kHz operation.

SYNC

1.100V Reference Output. Capable of sourcing 50µA for external loads. Bypass with 0.22µF minimum.

REF

Gate-Drive and Boost-Circuit Power Supply. Can be driven from a supply other than VCC. If the same supply

is used by both VCC and VGG, isolate VCC from VGG with a 20Ω resistor. Bypass to PGND with a 4.7µF

capacitor. VGG current = (QG1 + QG2) x f, where QG is the MOSFET gate charge at VGS = VGG.

VGG

Power Ground

PGND

Low-Side Gate-Driver Output

High-Side Gate-Driver Output

Low-Noise Mode Control. Forces fixed-frequency PWM operation when high.

SKIP

Inductor Connection

Boost Capacitor Connection

BST

Main Analog Supply-Voltage Input to the Chip. VCC powers the PWM controller, logic, and reference. Input

range is 3.15V to 5.5V. Bypass to GND with a 0.1µF capacitor close to the pin.

VCC

MAX1637EEE Datasheet(PDF) 6 Page - Maxim Integrated Products

MAX1637EEE Datasheet(HTML) 6 Page - Maxim Integrated Products

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20

Datasheet Download

Link URL