18 V, 12 A Step-Down Regulator with

Programmable Current Limit

Data Sheet

ADP2389/ADP2390

FEATURES

Input voltage: 4.5 V to 18 V

Continuous output current: 12 A

Integrated MOSFETs: 17 mΩ high-side/4.5 mΩ low-side

0.6 V ± 0.5% reference voltage

Programmable switching frequency range: 200 kHz to 2200 kHz

Enhanced transient response

Programmable current limit with ±10% accuracy

Precision enable and power good

External compensation and soft start

PFM mode (ADP2390 only)

Start up into a precharged output

Supported by the ADIsimPower design tool

APPLICATIONS

Communication infrastructure

Networking and servers

Industrial and instrumentation

Healthcare and medical

Intermediate power rail conversions

DC-to-DC point of load applications

TYPICAL APPLICATIONS CIRCUIT

Figure 1.

GENERAL DESCRIPTION

The ADP2389/ADP2390 are current mode control, synchronous

step-down, dc-to-dc regulators. They integrate a 17 mΩ high-side

power MOSFET and a 4.5 mΩ synchronous rectifier MOSFET to

provide a high efficiency solution. The ADP2390 operates in pulse

frequency modulation (PFM) mode to improve the system

efficiency at light load. The ADP2389/ADP2390 run from an

input voltage of 4.5 V to 18 V and can deliver up to 12 A of output

current. The output voltage can be adjusted to 0.6 V and the

switching frequency can be programmed between 200 kHz to

2200 kHz.

The ADP2389/ADP2390 target high performance applications

that require high efficiency and design flexibility. External

compensation and soft start provide design flexibility. The power-

good output and precision enable input provide simple and reliable

power sequencing. An enhanced transient response feature

improves the load transient performance, which reduces the

output capacitance. Programmable current limit allows the user

to optimized the inductor design and provide a compact solution.

Other key features include undervoltage lockout (UVLO),

overvoltage protection (OVP), overcurrent protection (OCP),

and thermal shutdown (TSD).

The ADP2389/ADP2390 operates over a −40°C to +125°C

junction temperature range and is available in 32-lead, 5 mm ×

5 mm LFCSP package.

BST

FB

COMP

PGOOD

GND

VREG

RT

ILIM

FTW

SS

L

SW

PGND

EN

PVIN

VIN

ADP2389/

ADP2390

100

60

65

70

75

80

85

90

95

0

1

2

3

4

5

6

7

8

9

10

11

12

OUTPUT CURRENT (A)

Rev. 0

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