ADP2442ACPZ-R7 datasheet(1/36 Pages) AD

No. de pieza	ADP2442ACPZ-R7

Descripción Electrónicos	36 V,1 A, Synchronous, Step-Down, DC-to-DC Regulator with External Clock Synchronization

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Fabricante Electrónico	AD [Analog Devices]

Página de inicio	http://www.analog.com

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36 V,1 A, Synchronous, Step-Down, DC-to-DC

Regulator with External Clock Synchronization

Data Sheet

ADP2442

Rev. B

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FEATURES

Wide input voltage range from 4.5 V to 36 V

Low minimum on time of 50 ns typical

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 from 300 kHz to 1 MHz

External synchronization from 300 kHz to 1 MHz

Pulse skip mode or forced fixed frequency mode

Precision enable input pin (EN)

Open-drain power good

Internal soft start

Overcurrent-limit protection

Shutdown current of less than 15 μA

UVLO and thermal shutdown

12-lead, 3 mm × 3 mm LFCSP package

Supported by the ADIsimPower™ tool set

Reference similar product ADP2441 with programmable soft

start and tracking

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 ADP2442 is a constant frequency, current mode control,

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

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

characteristics. The ADP2442 operates with a wide input voltage

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

power from a wide variety of sources. In addition, the ADP2442

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

for applications requiring a very high step-down ratio.

The output voltage can be adjusted from 0.6 V to 0.9 × VIN. 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 ADP2442 also has an accurate power-good

(PGOOD) open-drain output signal.

TYPICAL CIRCUIT CONFIGURATION

Figure 1.

The ADP2442 offers the flexibility of external clock

synchronization. The switching frequency can be synchronized to

an external clock, applied to the SYNC/MODE pin. The ADP2442

can also be configured to operate in the forced fixed frequency

mode for low EMI or power saving mode to reduce the switching

losses at light load.

The ADP2442 uses hiccup mode to protect the IC from short

circuits or from overcurrent conditions on the output. The internal

soft start limits inrush current during startup for a wide variety of

load capacitances. Other key features include input undervoltage

lockout (UVLO), thermal shutdown (TSD), and precision enable

(EN), which can also be used as a logic level shutdown input.

The ADP2442 is available in a 3 mm × 3 mm, 12-lead LFCSP

package and is rated for a junction temperature range from

−40°C to +125°C.

Figure 2. Efficiency vs. Load Current, VIN = 24 V

ADP2442

FB

COMP

EN

PGND

VIN

VOUT

SW

VOUT

CCOMP

RCOMP

RBOTTOM

RFREQ

RTOP

C1

C2

CBOOST

CIN

COUT

0

20

40

60

80

100

10

30

50

70

90

0.01

0.1

LOAD (A)

1

VOUT = 12V

VIN = 24V

PWM = 300kHz

VOUT = 5V

VOUT = 3.3V

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ADP2442ACPZ-R7 Datasheet(PDF) 1 Page - Analog Devices

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