REV. 0

ADP3156

–3–

ABSOLUTE MAXIMUM RATINGS*

Shutdown Input Voltage . . . . . . . . . . . . . . . . –0.3 V to +16 V

Operating Ambient Temperature Range . . . . . . 0

°C to +70°C

Junction Temperature Range . . . . . . . . . . . . . . 0

°C to +150°C

θ

JA

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 90

°C/W

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

°C to +150°C

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

°C

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

be permanently damaged.

ORDERING GUIDE

Buck Converter

Package

Model

Output Voltage

Option

ADP3156JR-1.5

1.5 V

R-16A/SO-16

ADP3156JR-1.8

1.8 V

R-16A/SO-16

ADP3156JR-2.5

2.5 V

R-16A/SO-16

PIN CONFIGURATION

16-Lead SOIC

TOP VIEW

(Not to Scale)

16

15

14

13

12

11

10

9

1

2

3

4

5

6

7

8

NC = NO CONNECT

NC

NC

AGND

SD

FB

SENSE–

SENSE+

PGND

NC

DRIVE1

DRIVE2

PWRGD

CMP

ADP3156

PIN FUNCTION DESCRIPTIONS

Pin

Mnemonic

Function

1, 2, 15

NC

No Connect.

3

AGND

Analog Ground. All internal signals of the ADP3156 are referenced to this ground.

4

SD

Shutdown. A logic high will place the ADP3156 in shutdown and disable both outputs. This pin

is internally pulled down.

5

FB

Feedback connection for the linear controller. Connect this pin to the resistor divider network to

set the output voltage of the linear regulator.

Gate Drive for the linear regulator N-channel MOSFET.

7

SENSE–

Connects to the internal resistor divider that senses the output voltage. This pin is also the refer-

ence input for the current comparator.

8

SENSE+

(+) input for the current comparator. The output current is sensed as a voltage at this pin with

respect to SENSE–.

10

CMP

Error Amplifier output and compensation point. The voltage at this output programs the

output current control level between the SENSE pins.

11

PWRGD

Power Good. An open drain signal indicates the output voltage is within a

±5% regulation band.

12

Supply Voltage to ADP3156.

13

DRIVE2

Gate Drive for the (bottom) Synchronous Rectifier N-channel MOSFET. The voltage at DRIVE2

14

DRIVE1

Gate Drive for the buck switch N-channel MOSFET. The voltage at DRIVE1 swings from

16

PGND

Power Ground. The drivers turn off the buck and synchronous MOSFETs by discharging their

gate capacitances to this pin. PGND should have a low impedance path to the source of the syn-

chronous MOSFET.

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 ADP3156 features 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