ADP3412

–3–

REV. 0

PIN FUNCTION DESCRIPTIONS

Pin

Mnemonic

Function

1

BST

Floating Bootstrap Supply for the Upper MOSFET. A capacitor connected between BST and SW pins

holds this bootstrapped voltage for the high-side MOSFET as it is switched. The capacitor should be

chosen between 100 nF and 1 F.

2

IN

TTL-level Input Signal, which has primary control of the drive outputs.

3

DLY

Low-High Transition Delay. A capacitor from this pin to ground programs the propagation delay from

turn-off of the lower FET to turn-on of the upper FET. The formula for the low-high transition delay

× (1 ns/pF) + 20 ns. The rise time for turn-on of the upper FET is not included in the formula.

4

VCC

Input Supply. This pin should be bypassed to PGND with ~1

µF ceramic capacitor.

5

DRVL

Synchronous Rectifier Drive. Output drive for the lower (synchronous rectifier) MOSFET.

6

PGND

Power Ground. Should be closely connected to the source of the lower MOSFET.

7

SW

This pin is connected to the buck-switching node, close to the upper MOSFET’s source. It is the floating

return for the upper MOSFET drive signal. It is also used to monitor the switched voltage to prevent turn-

on of the lower MOSFET until the voltage is below ~1 V. Thus, according to operating conditions, the

high-low transition delay is determined at this pin.

8

DRVH

Buck Drive. Output drive for the upper (buck) MOSFET.

ORDERING GUIDE

Model

Temperature Range

Package Description

Package Option

ADP3412JR

0

°C to 70°C

8-Lead Standard Small Outline Package (SOIC)

R-8

PIN CONFIGURATION

1

2

3

4

8

7

6

5

TOP VIEW

(Not to Scale)

ADP3412

BST

IN

DLY

VCC

DRVH

SW

PGND

DRVL

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 ADP3412 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