REV. A

ADP3158/ADP3178

–3–

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

θ

JA

Two-Layer Board . . . . . . . . . . . . . . . . . . . . . . . . . 125

°C/W

Four-Layer Board . . . . . . . . . . . . . . . . . . . . . . . . . . 81

°C/W

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 CONFIGURATION

TOP VIEW

(Not to Scale)

16

15

14

13

12

11

10

9

1

2

3

4

5

6

7

8

VID0

VID1

VID2

VID3

LRFB1

LRDRV1

CS–

CS+

GND

DRVH

DRVL

VCC

LRFB2

LRDRV2

COMP

CT

ADP3158/

ADP3178

PIN FUNCTION DESCRIPTIONS

Pin

Mnemonic

Function

1–4

VID0–VID3

Voltage Identification DAC Inputs.

These pins are pulled up to an internal

reference, providing a Logic 1 if left

open. The DAC output programs the CS–

regulation voltage from 1.3 V to 2.05 V.

5, 12 LRFB1,

Feedback connections for the linear

LRFB2

regulator controllers.

6, 11 LRDRV1,

Gate drives for the respective linear

LRDRV2

regulator N-channel MOSFETs.

7

CS–

Current Sense Negative Node. Negative

input for the current comparator. This pin

also connects to the internal error ampli-

fier that senses the output voltage.

8

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–.

9

CT

External capacitor connected from CT to

ground sets the Off-time of the device.

10

COMP

Error Amplifier Output and Compensation

Point. The voltage at this output programs

the output current control level between

CS+ and CS–.

13

VCC

Supply Voltage for the device.

14

DRVL

Low-Side MOSFET Drive. Gate drive for

the synchronous rectifier N-channel

MOSFET. The voltage at DRVL swings

from GND to VCC.

15

DRVH

High-Side MOSFET Drive. Gate drive

for the buck switch N-channel MOSFET.

The voltage at DRVH swings from GND

to VCC.

16

GND

Ground Reference. GND should have a

low impedance path to the source of the

synchronous MOSFET.

ORDERING GUIDE

Temperature

LDO

Package

Package

Model

Range

Voltage

Description

Option

ADP3158JR

0

°C to 70°C

2.5 V, 1.8 V

SO = Small Outline Package

R-16A (SO-16)

ADP3178JR

0

°C to 70°C

Adjustable

SO = Small Outline Package

R-16A (SO-16)

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 ADP3158/ADP3178 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