ADM1052JR データシートの表示（PDF） - Analog Devices

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ADM1052JR

Precision Dual Voltage Regulator Controller

Analog Devices 

12V SUPPLY

POR THRESHOLD

6V – 9V

VREF TURN-ON

THRESHOLD

3.3V SUPPLY

TO EXTERNAL

MOSFET DRAIN

ADM1052

GATE DRIVE TO

EXTERNAL MOSFET

MOSFET GATE

THRESHOLD

CHANNEL 1

OR CHANNEL 2

OUTPUT VOLTAGE

CHANNEL 1

OR CHANNEL 2

OUTPUT CURRENT

NORMAL OUTPUT VOLTAGE

OUTPUT < 0.8 ؋ VREG

HICCUP MODE

HOLD-OFF TIME

DEVICE

ENTERS

HICCUP MODE

FAULT

CURRENT

2 AMPS

OFF

ON

1:40 DUTY CYCLE

Figure 2. Power-On Reset and Hiccup Mode

FAULT

REMOVED

APPLICATIONS INFORMATION

PCB LAYOUT

For optimum voltage regulation, the loads should be placed as

close as possible to the source of the output MOSFETs and

feedback to the sense inputs should be taken from a point as

close to the loads as possible. The PCB tracks from the loads

back to the sense inputs should be separate from the output

tracks and not carry any load current.

Similarly, the ground connection to the ADM1052 should be

made as close as possible to the ground of the loads, and the

ground track from the loads to the ADM1052 should not carry

load current. Correct and incorrect layout practice is illustrated

in Figure 3.

12V

VCC

FORCE 1

12V

VCC

FORCE 1

VIN

3.3V

SENSE 1

FORCE 2

SENSE 2

GND

I1

VOUT1

LOAD 1

VIN

3.3V

I2

VOUT2

LOAD 2

SENSE 1

FORCE 2

VOUT1

SENSE 2

GND

I1

LOAD 1

I1 + I2

VOUT2

I2

VOLTAGE DROP

BETWEEN OUTPUT

AND LOAD

LOAD 2

CORRECT

VOLTAGE DROP

IN GROUND LEAD

INCORRECT

Figure 3. Correct and Incorrect Layout Practice

REV. A

–7–

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