36 V,1 A, Synchronous,

Step-Down DC-to-DC Regulator

Data Sheet

ADP2441

Rev. A

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FEATURES

Wide input voltage range of 4.5 V to 36 V

Low minimum on time of 50 ns

Maximum load current of 1 A

High efficiency of up to 94%

Adjustable output down to 0.6 V

±1% output voltage accuracy

Adjustable switching frequency of 300 kHz to 1 MHz

Pulse skip mode at light load for power saving

Precision enable input pin

Open-drain power good

External soft start with tracking

Overcurrent-limit protection

Shutdown current of less than 15 μA

UVLO and thermal shutdown

12-lead, 3 mm × 3 mm LFCSP package

APPLICATIONS

Point of load applications

Distributed power systems

Industrial control supplies

Standard rail conversion to 24 V/12 V/5 V/3.3 V

GENERAL DESCRIPTION

The ADP2441 is a constant frequency, current mode control,

synchronous, step-down dc-to-dc regulator that is capable of

driving loads up to 1 A with excellent line and load regulation

characteristics. The ADP2441 operates with a wide input voltage

range of 4.5 V to 36 V, which makes it ideal for regulating power

from a wide variety of sources. In addition, the ADP2441 has

very low minimum on time (50 ns) and is, therefore, suitable for

applications requiring a very high step-down ratio.

High efficiency is obtained with integrated low resistance

N-channel MOSFETs for both high-side and low-side devices.

The switching frequency is adjustable from 300 kHz to 1 MHz with

an external resistor. The ADP2441 also has an accurate power-good

(PGOOD) open-drain output signal.

At light load conditions, the regulator operates in pulse skip

mode by skipping pulses and reducing switching losses to improve

energy efficiency. In addition, at medium to heavy load conditions,

the regulator operates in fixed frequency pulse-width modulation

(PWM) mode to reduce electromagnetic interference (EMI).

TYPICAL CIRCUIT CONFIGURATION

FB

COMP

EN

PGND

VIN

SW

ADP2441

C4

C3

Figure 1.

0

20

40

60

80

100

10

30

50

70

90

0.02

0.2

1

LOAD (A)

The ADP2441 uses hiccup mode to protect the IC from short

circuits or from overcurrent conditions on the output. The external

programmable soft start limits inrush current during startup for

a wide variety of load capacitances. Other key features include

tracking, input undervoltage lockout (UVLO), thermal shutdown

(TSD), and precision enable (EN), which can also be used as a

logic level shutdown input.

The ADP2441 is available in a 3 mm × 3 mm, 12-lead LFCSP

package and is rated for a junction temperature range of −40°C

to +125°C.