MAX1966ESA datasheet(6/15 Pages) MAXIM

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Low-Cost Voltage-Mode PWM

Step-Down Controllers

_______________________________________________________________________________________

IOUT

VIN = 5.0V

VIN = 1.8V

L = 22

µF

Typical Operating Characteristics (continued)

(TA = +25°C, unless otherwise noted.)

1A/div

1V/div

2V/div

INDUCTOR

CURRENT

VOUT

VIN

10ms/div

SHUTDOWN WAVEFORMS

NO LOAD

Pin Description

MAX1966

MAX1967

NAME

FUNCTION

BST

Positive Supply of DH Driver. Connect 0.1µF ceramic capacitor between BST and LX.

COMP/EN

Compensation Pin. Pulling COMP/EN low with an open-collector or open-drain device

turns off the output.

Feedback Input. Connect a resistive divider network to set VOUT. FB threshold is 0.8V.

—

VCC

Internal Chip Supply. Connect to VL via a 10

Ω resistor.

VIN

Power Supply for LDO Regulator in the MAX1967 and Chip Supply for the MAX1966.

Bypass with a ceramic capacitor to ground (see application circuit).

—

5VL

Output of Internal 5V LDO. Bypass with a 2.2µF capacitor to GND, or if VIN < 5.5,

connect VL to VIN and bypass with a 0.1µF capacitor to GND.

Low-Side External MOSFET Gate-Driver Output. DL swings from VL to GND.

GND

Ground and Negative Current-Sense Input

Inductor Switching Node. LX is used for both current limit and the return supply of the

DH driver.

High-Side External MOSFET Gate-Driver Output. DH swings from BST to LX.

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