ADP1148, ADP1148-3.3, ADP1148-5

–4–

REV. A

CAUTION

ESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000 V readily

accumulate on the human body and test equipment and can discharge without detection. Although

the ADP1148, ADP1148-3.3, ADP1148-5 feature proprietary ESD protection circuitry, permanent

damage may occur on devices subjected to high energy electrostatic discharges. Therefore, proper

ESD precautions are recommended to avoid performance degradation or loss of functionality.

PIN FUNCTION DESCRIPTIONS

Pin #

Mnemonic

Function

1

P-Channel Drive

ground.

2

NC

No Connection.

Input Voltage.

5

Internal Supply Voltage, Nominally 3.3 V. Must be decoupled to signal ground. Do not externally load

this pin.

Error Amplifier Decoupling Point. The current comparator threshold increases with the Pin 7 voltage.

7

Sense–

Connects to internal resistive divider that sets the output voltage in ADP1148-3.3 and ADP1148-5

versions. Pin 7 is also the (–) input for the current comparator.

8

Sense+

The (+) Input for the Current Comparator. A built-in offset between Pins 7 and 8, in conjunction with

For the ADP1148 adjustable version, Pin 9 serves as the feedback pin from an external resistive divider

used to set the output voltage. On ADP1148-3.3 and ADP1148-5 versions, this pin is not used.

10

Shutdown

Taking Pin 10 of the ADP1148, ADP1148-3.3 or ADP1148-5 high holds both MOSFETs off. Must be

at ground potential for normal operation.

11

Signal GND

12

Power GND

13

NC

No Connection.

14

N-Channel Drive

High Current Drive for bottom N-channel MOSFET. The voltage swing at Pin 13 is from ground to

PIN CONFIGURATIONS

14-Lead Plastic DIP

14-Lead Plastic SO

14

13

12

11

10

9

8

1

2

3

4

7

6

5

TOP VIEW

(Not to Scale)

NC = NO CONNECT

P-DRIVE

SIGNAL GND

POWER GND

NC

N-DRIVE

NC

ADP1148

SENSE(+)

SHUTDOWN

SENSE(–)

*FIXED OUTPUT VERSIONS = SD1

WARNING!

ESD SENSITIVE DEVICE