MAX1970 データシートの表示（PDF） - Maxim Integrated

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MAX1970

Dual, 180° Out-of-Phase, 1.4MHz, 750mA Step-Down Regulator with POR and RSI/PFO

Maxim Integrated 

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

Down Regulator with POR and RSI/PFO

(TA = +25°C, unless otherwise noted.)

Typical Operating Characteristics (continued)

SHUTDOWN RESPONSE

POR

EN

VOUT1

VOUT2

5ms/div

MAX1970

VIN = 5V

VOUT1 = 3.3V, VOUT2 = 2.5V

IOUT1 = 375mA, IOUT2 = 375mA

5V/div

NAME

PIN

MAX1970/MAX1972 MAX1971

1

LX1

LX1

2

VCC

VCC

3

COMP1

COMP1

4

FB1

FB1

5

FB2

FB2

6

COMP2

COMP2

7

REF

8

GND

REF

GND

Pin Description

FUNCTION

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

Analog Supply Voltage. Bypass with 0.1µF to ground.

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.

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.

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.

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.

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.

Ground

10 ______________________________________________________________________________________

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