MAX886 Datasheet, PDF (1/20 Pages) Maxim Integrated Products – Wireless and Satellite Handset Power-Management ICs

19-1438; Rev 0; 3/99
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Wireless and Satellite Handset
Power-Management ICs
General Description
The MAX886/MAX888 power-management ICs are com-
plete power systems for wireless and satellite handsets.
The devices operate from 3 to 6-cell NiCd/NiMH batter-
ies or from 1 or 2-cell Li-Ion batteries. They incorporate a
high-efficiency, step-down DC-DC converter, a regulated
5V charge pump, and four linear regulators. The regula-
tors supply power to the SIM, LCD, BB, DSP, and RF
sections of a cellular telephone handset. The step-down
converter and linear regulator outputs are adjustable by
internal 4-bit DACs, programmable through the I²C™-
compatible serial interface. A pushbutton on/off scheme
activates a 5µA low-power shutdown mode. The devices
also feature a low-battery detector output and an internal
start-up timer.
The MAX886/MAX888 differ in output voltage range and
power-on reset voltage. The MAX886 has a higher preset
voltage range and is intended for 2-cell Li-Ion or 5/6-cell
NiCd/NiMH batteries. The MAX888 has a lower preset
voltage range and is intended for 1-cell Li-Ion or 3/4-cell
NiCd/NiMH batteries. Both devices are available in a
space-saving, 32-pin TQFP package.
Satellite Phones
Wireless Handsets
Applications
Private Mobile Radio (PMR)
GSM Cellular/PCS Telephones
Pin Configuration appears at end of data sheet.
Features
o 90% Efficient, 500mA Step-Down Converter
o Two 100mA DAC-Controlled LDOs
One 200mA DAC-Controlled LDO
One 20mA DAC-Controlled LDO
o 3 to 6-Cell NiCd or NiMH Operation
1 or 2-Cell Li-Ion Operation
o +2.7V to +12V Input Voltage Range
o 250µA Standby (PFM) Quiescent Current
o 5µA Shutdown Current
o I²C-Compatible Serial Interface
o Selectable 375kHz, 535kHz, 670kHz, 925kHz
(or Synchronizable) Switching Frequency
o Power-On Reset and Start-Up Timer
o Thermal Overload Protection
o Pushbutton On/Off Control
o Space-Saving 32-Pin TQFP Package (7mm x 7mm)
Ordering Information
PART
TEMP. RANGE PIN-PACKAGE
MAX886ECJ*
-40°C to +85°C 32 TQFP
MAX888ECJ
-40°C to +85°C 32 TQFP
* Future product—contact factory for availability.
Typical Operating Circuit
IN
2.7V TO 12V
LOW-BATTERY
DETECT
I²C-COMPATIBLE
SERIAL INTERFACE
ON/OFF CONTROL
(OPTIONAL)
BATT
LBI
LBO
SCL
SDA
ON
OFF
SYNC
C+
C-
MAX886
MAX888
GND
LX
PGND
OUT0
OUT1
OUT2
RESET
OUT3
OUT4
OUT5
ONSTAT
MAIN POWER (UP TO 500mA)
Tx SECTION POWER (UP TO 100mA)
DSP POWER (UP TO 200mA)
POWER-ON RESET
3V/5V SIM CARD POWER (UP TO 20mA)
LCD/VCO/TXCO POWER (UP TO 100mA)
Rx SECTION POWER (UP TO 100mA)
ON STATUS
I²C is a trademark of Philips Corp.
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