19-1225; Rev 3; 9/04
High-Voltage, Low-Power Linear Regulators
for Notebook Computers
____________________________Features
The MAX1615/MAX1616 are micropower, SOT23-5 linear 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 quiescent supply current.
Despite a miserly 8µA (max) no-load supply current, the
MAX1615/MAX1616 have excellent line-transient
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 provided by internal foldback current limiting and thermalshutdown circuitry. The MAX1615/MAX1616 are now
available in lead-free packages.
♦ 4V to 28V Input Range
________________________Applications
_______________Ordering Information
CMOS/RTC Backup Power
Microcontroller Power
♦ 8µA (max) Quiescent Supply Current
♦ <1µA Shutdown Supply Current
♦ 3.3V or 5V, Pin-Selectable Output (MAX1615)
Adjustable 1.24V to 28V Output (MAX1616)
♦ 30mA Output Current
♦ ±2% Initial Output Accuracy
♦ Thermal-Overload Protection
♦ 5-Pin SOT23 Package
♦ Low Cost
PART
-40°C to +85°C
5 SOT23-5
ABZD
MAX1615EUK+T
-40°C to +85°C
5 SOT23-5
ABZD
MAX1616EUK-T
-40°C to +85°C
5 SOT23-5
ABZE
MAX1616EUK+T
Battery-Powered Systems
PINSOT
PACKAGE TOP MARK
MAX1615EUK-T
Notebook Computers
Smart-Battery Packs
PDAs and Handy-Terminals
TEMP RANGE
-40°C to +85°C
5 SOT23-5
ABZE
+Denotes lead-free package.
____________Typical Operating Circuit
___________________Pin Configuration
TOP VIEW
OUT
IN
OUTPUT
VOLTAGE
MAX1615
BATTERY
CIN
0.1µF
COUT
4.7µF
SHDN
GND
5/3
IN 1
GND 2
5
SHDN
4
5/3 (FB)
MAX1615
MAX1616
OUT 3
SOT23-5
( ) ARE FOR MAX1616.
________________________________________________________________ Maxim Integrated Products
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.
1
MAX1615/MAX1616
________________General Description
