3 A, 36 V, Synchronous Step-Down

DC-to-DC Regulator

Data Sheet

ADP2443

Rev. 0

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FEATURES

Continuous output current: 3 A

Input voltage: 4.5 V to 36 V

Integrated MOSFETs: 98 mΩ/35 mΩ

Reference voltage: 0.6 V ± 1%

Fast minimum on time: 50 ns

Programmable switching frequency: 200 kHz to 1.8 MHz

Synchronizes to external clock: 200 kHz to 1.8 MHz

Precision enable and power good

Cycle-by-cycle current limit with hiccup protection

External compensation

Programmable soft start time

Startup into a precharged output

Supported by ADIsimPower design tool

APPLICATIONS

Intermediate power rail conversion

Multicell battery powered systems

Process control and industrial automation

Healthcare and medical

Networking and servers

TYPICAL APPLICATION CIRCUIT

PVIN

EN

BST

ADP2443

SW

RAMP

PGOOD

RT/SYNC

VREG

GND

PGND

FB

COMP

SS

L

Figure 1.

GENERAL DESCRIPTION

The ADP2443 is synchronous step-down, dc-to-dc regulator

with an integrated 98 mΩ, high-side power metal oxide semicon-

ductor field effect transistor (MOSFET) and a 35 mΩ, synchronous

rectifier MOSFET to provide a high efficiency solution in a

compact 4 mm × 4 mm LFCSP package. The regulators operate

from an input voltage range of 4.5 V to 36 V. The output voltage

can be adjusted down to 0.6 V and deliver up to 3 A of

continuous current. The fast 50 ns minimum on time allows the

regulators convert high input voltage to low output voltage at high

frequency.

The ADP2443 uses an emulated current mode, constant frequency

pulse-width modulation (PWM) control scheme for excellent

stability and transient response. The switching frequency of the

ADP2443 can be programmed from 200 kHz to 1.8 MHz. The

synchronization function allows the switching frequency be syn-

chronized with an external clock to minimize the system noise.

The ADP2443 targets high performance applications that require

high efficiency and design flexibility. External compensation

and an adjustable soft start function provide design flexibility.

The power-good output and precision enable input provide

simple and reliable power sequencing.

Other key features include undervoltage lockout (UVLO),

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

short-circuit protection (SCP), and thermal shutdown (TSD).

The ADP2443 operates over the −40°C to +125°C operating

junction temperature range and is available in a 24-lead, 4 mm ×

4 mm LFCSP package.

100

50

55

60

65

70

75

80

85

90

95

0

0.5

1.0

1.5

2.0

2.5

3.0

OUTPUT CURRENT (A)