ADP3050 データシートの表示（PDF） - Analog Devices

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ADP3050

200 kHz, 1 A High Voltage Step-Down Switching Regulator

Analog Devices 

Data Sheet

ADP3050

PIN CONFIGURATION AND FUNCTION DESCRIPTIONS

SWITCH 1

8 IN

BOOST 2 ADP3050 7 GND

BIAS 3 TOP VIEW 6 SD

FB 4 (Not to Scale) 5 COMP

Figure 2. Pin Configuration

Table 3. Pin Function Descriptions

Pin No.

Mnemonic Description

1

SWITCH

Switch Node. This pin is the emitter of the internal NPN power switch. The voltage at this pin switches between

VIN and approximately −0.5 V.

2

BOOST

Boost Pin. This pin is used to provide a boosted voltage (higher than VIN) for the drive stage of the NPN power

switch. With the higher drive voltage, the power switch can be saturated, greatly reducing the switch power

losses.

3

BIAS

Bias Input Pin. Connect this pin to the regulated output voltage to maximize system efficiency. When this pin is

above 2.7 V, most of the ADP3050 operating current is taken from the output instead of the input supply. Leave

unconnected if not used.

4

FB

Feedback Pin. This feedback pin senses the regulated output voltage. Connect this pin directly to the output

(fixed output versions).

5

COMP

Compensation Node. This pin is used to compensate the regulator with an external resistor and capacitor. This

pin is also used to override the control loop. However, the voltage on this pin should not exceed 2 V, because

the pin is internally clamped to ensure a fast transient response. Use a pull-up resistor if this pin is to be pulled

higher than 2 V.

6

SD

Shutdown Pin. Use this pin to turn the device on and off. If this feature is not needed, tie this pin directly to IN.

7

GND

Ground Pin. Connect this pin to local ground plane.

8

IN

Power Input. Connect this pin to the input supply voltage. An input bypass capacitor must be placed close to

this pin to ensure proper regulator operation.

Rev. C | Page 5 of 20

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