REV. A

ADP3159/ADP3179

–3–

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 ADP3159 and the ADP3179 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.

WARNING!

ESD SENSITIVE DEVICE

ORDERING GUIDE

Temperature

LDO

Package

Package

Model

Range

Voltage

Description

Option

ADP3159JRU

0

°C to 70°C

2.5 V, 1.8 V

Thin Shrink Small Outline

RU-20

ADP3179JRU

0

°C to 70°C

Adjustable

Thin Shrink Small Outline

RU-20

ABSOLUTE MAXIMUM RATINGS

*

VCC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –0.3 V to +15 V

DRVH, DRVL, LRDRV1, LRDRV2 . . . . –0.3 V to VCC + 0.3 V

All Other Inputs and Outputs . . . . . . . . . . . . –0.3 V to +10 V

Operating Ambient Temperature Range . . . . . . . 0

°C to 70°C

Operating Junction Temperature . . . . . . . . . . . . . . . . . 125

°C

Storage Temperature Range . . . . . . . . . . . . –65

°C to +150°C

Lead Temperature (Soldering, 10 sec) . . . . . . . . . . . . 300

°C

Vapor Phase (60 sec) . . . . . . . . . . . . . . . . . . . . . . . . . . 215

°C

Infrared (15 sec) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 220

°C

*This is a stress rating only; operation beyond these limits can cause the device to

be permanently damaged. Unless otherwise specified, all voltages are referenced

to GND.

PIN FUNCTION DESCRIPTIONS

Pin

Mnemonic

Function

1, 19 NC

No Connection.

2–5

VID3, VID2, Voltage Identification DAC Inputs. These

VID1, VID0

pins are pulled up to an internal reference,

providing a Logic One if left open. The

DAC output programs the FB regulation

voltage from 1.3 V to 2.05 V.

6

PWRGD

Open drain output that signals when the

output voltage is in the proper operating

range.

7, 15 LRFB1,

Feedback connections for the linear

LRFB2

regulator controllers.

8, 14 LRDRV1,

Gate drives for the respective linear

LRDRV2

regulator N-channel MOSFETs.

9

FB

Feedback Input. Error amplifier input for

remote sensing of the output voltage.

10

CS–

Current Sense Negative Node. Negative

input for the current comparator.

11

CS+

Current Sense Positive Node. Positive

input for the current comparator. The

output current is sensed as a voltage at this

pin with respect to CS–.

12

CT

External capacitor connected from CT to

ground sets the Off-time of the device.

13

COMP

Error Amplifier Output and Compensation

Point. The voltage at this output programs

the output current control level between

CS+ and CS–.

16

VCC

Supply Voltage for the device.

17

DRVL

Low-Side MOSFET Drive. Gate drive for

the synchronous rectifier N-channel

MOSFET. The voltage at DRVL swings

from GND to VCC.

18

DRVH

High-side MOSFET Drive. Gate drive for

the buck switch N-channel MOSFET.

The voltage at DRVH swings from GND

to VCC.

20

GND

Ground Reference. GND should have a

low impedance path to the source of hte

synchronous MOSFET.

PIN CONFIGURATION

RU-20

TOP VIEW

(Not to Scale)

20

19

18

17

16

15

14

13

12

11

1

2

3

4

5

6

7

8

9

10

ADP3159/

NC = NO CONNECT

CS–

FB

LRDRV1

VID0

VID1

VID2

LRFB1

PWRGD

VID3

CS+

CT

COMP

NC

DRVH

DRVL

LRDRV2

LRFB2

VCC

NC

GND

ADP3179