ADP3050-3.3 Analog Devices, ADP3050-3.3 Datasheet

ADP3050-3.3

Manufacturer Part Number

ADP3050-3.3

Description

200 Khz, 1 a Step-down High-voltage Switching Regulator

Manufacturer

Analog Devices

Datasheet

1.ADP3050-3.3.pdf (16 pages)

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GENERAL DESCRIPTION

The ADP3050 is a current-mode monolithic buck (step-down)

PWM switching regulator that contains a high current 1 A power

switch and all control, logic, and protection functions. It uses a

unique compensation scheme that allows the use of any type of

output capacitor (tantalum, ceramic, electrolytic, OS-CON).

Unlike some buck regulators, the design is not restricted to using

a specific type of output capacitor or ESR value.

A special boosted drive stage is used to saturate the NPN power

switch, providing a system efficiency higher than conventional

bipolar buck switchers. Further efficiency improvements are

obtained by using the low voltage regulated output to provide

the device's internal operating current. A high switching frequency

allows the use of small external surface-mount components. A

wide variety of standard off-the-shelf devices can be used, pro-

viding a great deal of design flexibility. A complete regulator

design requires only a few external components.

The ADP3050 includes a shutdown input that places the device

in a low-power mode, reducing the total supply current to under

20 µA. Internal protection features include thermal shutdown

circuitry and a cycle-by-cycle current-limit for the power switch

to provide complete device protection under fault conditions.

The ADP3050 provides excellent line and load regulation,

maintaining typically less than ± 3% output voltage accuracy

over temperature and under all input voltage and output cur-

rent conditions.

The ADP3050 is specified over the industrial temperature range of

–40°C to +85°C and is available in a thermally enhanced 8-lead

SOIC package.

GND

Step-Down Switching Regulator

AND CURRENT LIMIT

1.2V

REGULATOR

BIAS

200 kHz, 1 A High-Voltage

FREQUENCY

FOLDBACK

FUNCTIONAL BLOCK DIAGRAM

2.5V

CMP

COMP

OSCILLATOR

200kHz

CURRENT SENSE

ADP3050

CURRENT

AMPLIFIER

LIMIT

ADP3050

DRIVER

SWITCH

BOOST

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