MAX1971EEE datasheet(10/20 Pages) MAXIM

10 / 20 page

Dual, 180° Out-of-Phase, 1.4MHz, 750mA Step-

Down Regulator with POR and RSI/PFO

______________________________________________________________________________________

5ms/div

5V/div

SHUTDOWN RESPONSE

POR

VOUT1

VOUT2

MAX1970

VIN = 5V

VOUT1 = 3.3V, VOUT2 = 2.5V

IOUT1 = 375mA, IOUT2 = 375mA

Typical Operating Characteristics (continued)

(TA = +25°C, unless otherwise noted.)

NAME

MAX1970/MAX1972

MAX1971

FUNCTION

LX1

Inductor Connection 1. Connect an inductor between LX1 and OUT1.

2VCC

VCC

Analog Supply Voltage. Bypass with 0.1µF to ground.

COMP1

OUT1 Regulator Compensation. Connect series RC network from COMP1 to GND.

COMP1 is pulled to GND when the outputs are shut down. See the Compensation

Design section for component values.

FB1

OUT1 Feedback. Connected to OUT1 for internal mode (FBSEL1 = GND or VCC).

Use an external resistor-divider from OUT1 to GND to set the output voltage from

1.2V to VIN for external mode (FBSEL1 = unconnected). See the Output Voltage

Selection section for <1.2V output.

FB2

OUT2 Feedback. Connected to OUT2 for internal mode (FBSEL2 = GND or VCC).

Use an external resistor-divider from OUT2 to GND to set the output voltage from

1.2V to VIN for external mode (FBSEL2 = unconnected). See the Output Voltage

Selection section for <1.2V output.

COMP2

OUT2 Regulator Compensation. Connect series RC network from COMP2 to GND.

COMP2 is pulled to GND when the outputs are shut down. See the Compensation

Design section for component values.

REF

Reference. Bypass with 0.01µF to 1.0µF capacitor. REF controls the soft-start

ramp and is pulled to GND when the outputs are shut down.

GND

Ground

Pin Description

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