Datasheet Analog Devices ADP2147 — Datenblatt

Compact, 800 mA, 3 MHz,
Simple DVS, Buck Regulator ADP2147
FEATURES GENERAL DESCRIPTION Input voltage: 2.3 V to 5.5 V
Peak efficiency: 95%
3 MHz fixed frequency operation
Low quiescent current: 23 μA
Ultralow shutdown current: 0.2 μA (typical)
VSEL pin for simple dynamic voltage scaling (DVS)
100% duty cycle low dropout mode
Internal synchronous rectifier, compensation, and soft start
Current overload and thermal shutdown protection
Small, 6-ball, 1 mm × 1.5 mm WLCSP package The ADP2147 is a high efficiency, low quiescent current, stepdown (buck) dc-to-dc regulator with an output voltage that can
be switched between two different settings under the control of
a select pin. The total solution requires only three tiny external
components. APPLICATIONS The ADP2147 runs on input voltages of 2.3 V to 5.5 V, which
allows for single lithium or lithium polymer cells, multiple
alkaline or NiMH cells, PCMCIA, USB, and other standard
power sources. The maximum load current of 800 mA is
achievable across the input voltage range. The buck regulator automatically switches operating modes,
depending on the load current level, to maximize efficiency. At
high output loads, the buck regulator operates in PWM mode.
When the load current falls below a predefined threshold, the
regulator operates in power save mode (PSM), improving the …