Analog Devices Inc. ADP2102YCPZ-1.8-R7

Description
The ADP2102 is a synchronous step-down DC-to-DC converter that converts an unregulated input voltage of 2.7 V to 5.5 V to a lower regulated output voltage with up to 95% efficiency and 1% accuracy. It features a low duty cycle capability, making it ideal for USB applications or 5 V systems that power up submicron subvolt processor cores. The ADP2102 operates at a typical frequency of 3 MHz, allowing the use of small, low-cost 1 μH inductors and 2.2 μF ceramic capacitors. It utilizes a current mode, pseudofixed frequency pulse-width modulation to extend battery life at medium-to-high load currents. 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, significantly reducing quiescent current.

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 x 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