ADP2102-1.8-EVALZ【PDF 1/24 页】BOARD EVAL FOR ADP2102-1.8

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Low Duty Cycle, 600 mA, 3 MHz Synchronous

Step-Down DC-to-DC Converter

ADP2102

FEATURES

Input voltage range: 2.7 V to 5.5 V

600 mA maximum load current

95% efficiency

Low duty cycle operation

Only 3 tiny external ceramic components

3 MHz typical operating frequency

Fixed output voltage from 0.8 V to 1.875 V

Adjustable output voltage up to 3.3 V

0.01 μA shutdown supply current

Automatic power save mode

Internal synchronous rectifier

Internal soft start

Internal compensation

Enable/shutdown logic input

Undervoltage lockout

Current limit protection

Thermal shutdown

Small 8-lead, 3 mm × 3 mm LFCSP package

APPLICATIONS

USB powered devices

WLAN and gateways

Point of loads

Processor core power from 5 V

Digital cameras

PDAs and palmtop computers

Portable media players, GPS

TYPICAL PERFORMANCE CHARACTERISTICS

GENERAL DESCRIPTION

The ADP2102 is a synchronous step-down dc-to-dc converter

that converts a 2.7 V to 5.5 V unregulated input voltage to a lower

regulated output voltage with up to 95% efficiency and 1%

accuracy. The low duty cycle capability of the ADP2102 is ideal for

USB applications or 5 V systems that power up submicron subvolt

processor cores. Its 3 MHz typical operating frequency and excel-

lent transient response allow the use of small, low cost 1 μH

inductors and 2.2 μF ceramic capacitors. At medium-to-high

load currents, it uses a current mode, pseudofixed frequency pulse-

width modulation to extend battery life. To ensure the longest

battery life in portable applications, the ADP2102 has a power save

mode (PSM) that reduces the switching frequency under light

load conditions to significantly reduce quiescent current.

The ADP2102 is available in both fixed and adjustable output

voltage options with 600 mA maximum output current. The preset

output voltage options voltage are 1.875 V, 1.8 V, 1.5 V, 1.375 V,

1.25 V, 1.2 V, 1.0 V, and 0.8 V. The adjustable voltage option is

available from 0.8 V to 3.3 V. The ADP2102 requires only three

external components and consumes 0.01 μA in shutdown mode.

The ADP2102 is available in an 8-lead LFCSP package and is

specified for the ?40 °C to +85 °C temperature range.

TYPICAL APPLICATIONS CIRCUIT

100

V IN = 3.6V

V IN = 2.7V

V IN = 3V

V IN = 4.2V

V OUT = 1.375V

T A = 25°C

INPUT VOLTAGE

2.7V TO 5.5V

C IN

2.2μF

FORCED

V IN

ADP2102

1μH

OUTPUT VOLTAGE

0.8V TO 1.875V

C OUT

2.2μF

CCM

MODE

FB/OUT

GND

DCM/

CCM

OFF

100

LOAD CURRENT (mA)

Figure 1.

1000

Figure 2.

Rev. B

Information furnished by Analog Devices is believed to be accurate and reliable. However, no

responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other

rights of third parties that may result from its use. Specifications subject to change without notice. No

license is granted by implication or otherwise under any patent or patent rights of Analog Devices.

Trademarks and registered trademarks are the property of their respective owners.

One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.

Tel: 781.329.4700 www.analog.com

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