20 V, 6 A Synchronous Step-Down

Regulator with Low-Side Driver

Data Sheet

ADP2381

FEATURES

Input voltage: 4.5 V to 20 V

Integrated 44 mΩ high-side MOSFET

0.6 V ± 1% reference voltage over temperature

Continuous output current: 6 A

Programmable switching frequency: 250 kHz to 1.4 MHz

Synchronizes to external clock: 250 kHz to 1.4 MHz

180° out-of-phase synchronization

Programmable UVLO

Power-good output

External compensation

Internal soft start with external adjustable option

Startup into a precharged output

Supported by ADIsimPower design tool

APPLICATIONS

Communication infrastructure

Networking and servers

Industrial and instrumentation

Healthcare and medical

Intermediate power rail conversion

DC-to-dc point of load application

TYPICAL APPLICATIONS CIRCUIT

Figure 1.

GENERAL DESCRIPTION

The ADP2381 is a current mode control, synchronous, step-

down, dc-to-dc regulator. It integrates a 44 mΩ power MOSFET

and a low-side driver to provide a high efficiency solution. The

ADP2381 runs from an input voltage of 4.5 V to 20 V and can

deliver 6 A of output current. The output voltage can be

adjusted to 0.6 V to 90% of the input voltage. The switching

frequency of the ADP2381 can be programmed from

250 kHz to 1.4 MHz or fixed at 290 kHz or 550 kHz. The

synchronization function allows the switching frequency to be

synchronized to an external clock to minimize system noise.

External compensation and an adjustable soft start provide

design flexibility. The power-good output provides simple and

reliable power sequencing. Additional features include

programmable undervoltage lockout (UVLO), overvoltage

protection (OVP), overcurrent protection (OCP), and thermal

shutdown (TSD).

The ADP2381 operates over the −40°C to +125°C junction

temperature range and is available in a 16-lead TSSOP_EP

package.

ADP2381

1

PVIN

PVIN

UVLO

PGOOD

RT

SYNC

EN/SS

COMP

BST

SW

SW

LD

VREG

PGND

GND

FB

2

3

4

5

6

7

8

16

15

14

13

12

11

10

9

L

FET

100

50

55

60

65

70

75

80

85

90

95

0

1

2

3

4

5

6

OUTPUT CURRENT (A)

Rev. 0

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