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ADP3171

Synchronous Buck Controller with Dual Linear Regulator Controllers

Analog Devices 

ADP3171

PIN FUNCTION DESCRIPTIONS

Pin Mnemonic Function

1 GND

Ground Reference. GND should have a low impedance path to the source of the synchronous MOSFET.

2 PWRGD Power Good Indicator. Open-drain output that signals when the output voltage is in the proper operating range.

3, 11 LRFB1,

LRFB2

Feedback connections for the fixed output voltage linear regulator controllers.

4, 10 LRDRV1, Gate drives for the respective linear regulator N-channel MOSFETs.

LRDRV2

5 FB

Feedback Input. Error amplifier input for remote sensing of the output voltage.

6 CS–

Current Sense Negative Node. Negative input for the current comparator.

7 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–.

8 CT

Timing Capacitor. An external capacitor connected from CT to ground sets the off time of the device.

9 COMP

Error Amplifier Output and Compensation Point. The voltage at this output programs the output current control

level between CS+ and CS–.

12 VCC

Supply Voltage for the ADP3171.

13 DRVL

Low-Side MOSFET Drive. Gate drive for the synchronous rectifier N-channel MOSFET. The voltage at DRVL

swings from GND to VCC.

14 DRVH

High-Side MOSFET Drive. Gate drive for the buck switch N-channel MOSFET. The voltage at DRVH swings

from GND to VCC.

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

␪JA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 105°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

GND 1

14 DRVH

PWRGD 2

13 DRVL

LRFB1 3

12 VCC

ADP3171

LRDRV1 4

11 LRFB2

TOP VIEW

FB 5 (Not to Scale) 10 LRDRV2

CS– 6

9 COMP

CS+ 7

8 CT

Model

ADP3171JR

ORDERING GUIDE

Temperature Range

0ºC to 70ºC

Package Option

SO-14

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

ADP3171 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

REV. 0

–3–

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