Date: 6th Feb 2011
Low quiescent current LDOs for portable
devices
Analog Devices has unveiled four low-dropout regulators
(LDOs) ADP160, ADP161, ADP162 and ADP163 with ultra-low-quiescent-current
for portable battery operated devices. These devices draw
only 560 nA (typical) at no load and 42 µA of quiescent
current (typical) at full load. ADI claims these LDOs provide
superior 70 dB PSRR (power-supply-rejection ratio) at 60
Hz, which is more than twice that of competing LDOs at full
load current. The new ADP16x series LDOs are designed for
applications such as power meter reader/data terminals,
portable industrial, medical measurement devices and remotely
located equipment operating from batteries or solar power.
The ADP160, ADP161, ADP162 and ADP163 LDOs provide up to
150 mA of output current and operate from 2.2-V to 5.5-V
supplies. The ADP160 and ADP162 fixed-output voltage and
ADP161 and ADP163 adjustable-output voltage regulators are
available in TSOT (thin-small-outline transistor) packages,
while the ADP160 and ADP162 are additionally available in
WLCSP (wafer-level, chip-scale package) packages. The ADP160
and ADP161 also include an output switch to discharge the
output load capacitor to zero volts when the device is turned
OFF to ensure microcontrollers are in a known state for
restart.
"Using innovative design techniques, the ADP16x LDO
series provides both ultra-low quiescent current and superior
power-supply-rejection performance for digital and RF applications,"
said Walt Heinzer, product line manager, Power Management
Group, Analog Devices, Inc. "These new LDOs are optimized
for use with small, 1 µF ceramic capacitors and will
meet the requirements of high-performance, space-constrained
designs."
|