MAX886ECJ 查看數據表（PDF） - Maxim Integrated
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MAX886ECJ Datasheet PDF : 20 Pages
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19-1438; Rev 1; 7/00
EVFAOLLULAOTWIOSNDKAITTAMSAHNEUEATL
Wireless and Satellite Handset
Power-Management ICs
General Description
The MAX886/MAX888/MAX1863 power-management ICs
are complete power systems for wireless and satellite
handsets. The devices operate from 3- to 6-cell
NiCd/NiMH batteries or from 1- or 2-cell lithium-ion (Li+)
batteries. They incorporate a high-efficiency, step-down
DC-DC converter, a regulated 5V charge pump, and four
linear regulators. The regulators supply power to the
SIM, LCD, BB, DSP, and RF sections of a cellular tele-
phone handset. The step-down converter and linear reg-
ulator outputs are adjustable by internal 4-bit DACs,
programmable through the I2C™-compatible serial inter-
face. A pushbutton on/off scheme activates a 5µA low-
power shutdown mode. The devices also feature a
low-battery detector output and an internal startup timer.
The MAX886/MAX888/MAX1863 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+
or 5- or 6-cell NiCd/NiMH batteries. The MAX888/
MAX1863 have a lower preset voltage range and are
intended for 1-cell Li+ or 3- or 4-cell NiCd/NiMH batter-
ies. All 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+ 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 Startup Timer
o Thermal Overload Protection
o Pushbutton On/Off Control
o Space-Saving 32-Pin TQFP Package (9mm x 9mm)
PART
MAX886ECJ
MAX888ECJ
MAX1863ECJ
Ordering Information
TEMP. RANGE
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
PIN-PACKAGE
32 TQFP
32 TQFP
32 TQFP
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
MAX1863
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.
________________________________________________________________ Maxim Integrated Products 1
For free samples and the latest literature, visit www.maxim-ic.com or phone 1-800-998-8800.
For small orders, phone 1-800-835-8769.
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