MAX1552 Datasheet, PDF (1/12 Pages) Maxim Integrated Products – Complete Power IC for Low-Cost PDAs

19-2831; Rev 0; 4/03
EVAALVUAAILTAIOBNLEKIT
Complete Power IC for
Low-Cost PDAs
General Description
The MAX1552 is a complete power-management chip for
low-cost personal digital assistants (PDAs) and portable
devices operating from a 1-cell lithium-ion (Li+), or 3-cell
NiMH, battery. It includes all the regulators, outputs, and
voltage monitors necessary for small PDAs while requir-
ing a bare minimum of external components. This device
features four linear regulators, a step-up DC-to-DC con-
verter for LCD bias, a microprocessor reset output, and
low battery detection in a miniature QFN package. For a
compatible Li+ charger for both USB and AC adapter
inputs, refer to the MAX1551*.
The four linear regulators feature PMOS pass elements for
efficient low-dropout operation. The MAIN LDO supplies
3.3V at over 300mA. An SD card slot output supplies 3.3V
at 200mA. The COR1 LDO outputs 1.5V at 200mA and
the COR2 LDO supplies 1.8V at 20mA. The SD output
and COR2 LDOs have pin-controlled shutdown. For other
output voltage combinations, contact Maxim.
The step-up DC-to-DC converter features an on-board
MOSFET and true shutdown when off. This means that
during shutdown, input power is disconnected from the
inductor so the boost output falls to 0V rather than
remaining one diode drop below the input voltage.
A µP reset output clears when the input voltage rises to
3.4V to ensure an orderly start. A low-battery output warns
the system of impending power loss for safe shutdown.
Thermal shutdown protects the die from overheating.
The MAX1552 operates from a 3.1V to a 5.5V supply
voltage and consumes 50µA no-load supply current. It
is packaged in a 1.3W, 16-pin thin QFN with a power
pad on the underside of the package. The MAX1552 is
specified for operation from -40°C to +85°C.
Features
o Minimum External Components
o 4 Linear Regulator Outputs
Main LDO 3.3V, 300mA
SD Card Output 3.3V, 200mA
Core LDO 1.5V, 200mA
2nd Core LDO 1.8V, 30mA
o High-Efficiency LCD Step-Up DC-to-DC Output
Up to 28V
LCD 0V True Shutdown When Off
o 50µA Quiescent Supply Current
o 1.3W Thin QFN Package
PART
MAX1552ETE
Ordering Information
TEMP RANGE
-40°C to +85°C
PIN-PACKAGE
16 Thin QFN
Typical Application Circuit
V_IN
IN
MAIN
3.3V, 300mA
SWIN
SDIG
3.3V, 200mA
MAX1552
REF
COR1
1.5V, 200mA
Applications
PDAs
Organizers
Cellular and Cordless Phones
MP3 Players
Hand-Held Devices
Pin Configuration appears at end of data sheet.
*Protected by U.S. Patent #6,507,172.
SDIG _OFF ON
COR2 _OFF ^ON
LCD _OFF ^ON
MAIN
RESET OUT
LOW BATT OUT
ENSD
ENC2
ENLCD
COR2
SW
LX
1.8V, 20mA
D1 _{LCD 20V, 1mA}
LFB
RS
LBO
GND
________________________________________________________________ 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.