19-1225; Rev 3; 9/04
Hig h -Vo lt a g e , Lo w -P o w e r Lin e a r Re g u la t o rs
fo r No t e b o o k Co m p u t e rs
________________Ge n e ra l De s c rip t io n
____________________________Fe a t u re s
♦ 4V to 28V Input Range
The MAX1615/MAX1616 are micropower, SOT23-5 lin-
ear regulators that supply always-on, keep-alive power
to CMOS RAM and microcontrollers (µCs) in systems
with high-voltage batteries. Key features include wide
input voltage range, low dropout voltage, and low qui-
escent supply current.
♦ 8µA (max) Quiescent Supply Current
♦ <1µA Shutdown Supply Current
♦ 3.3V or 5V, Pin-Selectable Output (MAX1615)
Adjustable 1.24V to 28V Output (MAX1616)
Despite a miserly 8µA (max) no-load supply current, the
MAX1615/MAX1616 ha ve e xc e lle nt line -tra ns ie nt
response and AC power-supply rejection ratio. They
provide a clean, fixed 5V or 3.3V output (MAX1615) or
an adjustable 1.24V to 28V output (MAX1616), even
when subjected to fast supply-voltage changes that
occur during the switchover from battery to AC adapter
input power. The space-saving SOT23-5 package has
excellent thermal characteristics and tolerates up to
571mW of power dissipation. Fault protection is provid-
ed by internal foldback current limiting and thermal-
shutdown circuitry. The MAX1615/MAX1616 are now
available in lead-free packages.
♦ 30mA Output Current
♦ ±2% Initial Output Accuracy
♦ Thermal-Overload Protection
♦ 5-Pin SOT23 Package
♦ Low Cost
________________________Ap p lic a t io n s
CMOS/RTC Backup Power
Microcontroller Power
_______________Ord e rin g In fo rm a t io n
PIN-
SOT
PART
TEMP RANGE
PACKAGE TOP MARK
MAX1615EUK-T
-40°C to +85°C 5 SOT23-5
ABZD
ABZD
ABZE
ABZE
Notebook Computers
MAX1615EUK+T -40°C to +85°C 5 SOT23-5
MAX1616EUK-T -40°C to +85°C 5 SOT23-5
Smart-Battery Packs
PDAs and Handy-Terminals
Battery-Powered Systems
MAX1616EUK+T -40°C to +85°C 5 SOT23-5
+Denotes lead-free package.
___________________P in Co n fig u ra t io n
____________Typ ic a l Op e ra t in g Circ u it
TOP VIEW
OUTPUT
VOLTAGE
IN
OUT
1
2
3
5
4
SHDN
IN
GND
OUT
MAX1615
MAX1616
MAX1615
C
0.1µF
C
OUT
4.7µF
IN
BATTERY
SHDN
GND
5/3 (FB)
5/3
SOT23-5
( ) ARE FOR MAX1616.
________________________________________________________________ Maxim Integrated Products
1
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.