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PDF MAX888ECJ Data sheet ( Hoja de datos )
| Número de pieza | MAX888ECJ | |
| Descripción | Wireless and Satellite Handset Power-Management ICs | |
| Fabricantes | Maxim Integrated | |
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19-1438; Rev 0; 3/99
EVFAOLLULAOTWIOSNDKAITTAMSAHNEUEATL
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.
________________________________________________________________ Maxim Integrated Products 1
For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800.
For small orders, phone 1-800-835-8769.
1 page  
Wireless and Satellite Handset
Power-Management ICs
ELECTRICAL CHARACTERISTICS (continued)
(VBATT = VIN0 = VIN1 = +5.5V, GND = PGND = DGND, V OFF = VSYNC = 2.8V, VIN2 = VIN3 = VIN4 = VIN5 = +3.8V, VOUT4 = +5.5V,
TA = -40°C to +85°C, unless otherwise noted. Typical values are at TA = +25°C.) (Note 1)
PARAMETER
ON Input Current
SYNC Input Voltage
SYNC Input Current
ONSTAT OUTPUT
ONSTAT Output Voltage
ONSTAT Output Voltage
SYMBOL
IIL
IIH
VIL
VIH
ISYNC
CONDITIONS
V ON = 0
1.2V < V ON < VOUT2
0 < VSYNC < VOUT2
VONSTATL IONSTAT = 1mA
VONSTATH IONSTAT = 0
MIN TYP MAX UNITS
-16 -40
µA
-5 -10
0.8
V
2.0
0.25 1
µA
VOUT2 -
0.5
0.5 V
V
RESET OUTPUT
Output Low Voltage
VRESETL I RESET = 1mA
0.5 V
Output High Voltage
V R ESETH
I RESET = 0,
internal 10kΩ pull-up resistor to OUT2
VOUT2 -
0.5
V
THERMAL SHUTDOWN
Threshold Temperature
160 °C
I2C-COMPATIBLE SERIAL INTERFACE
SCL Clock Frequency
SCL Low Period
SCL High Period
Data Set-Up Time
Data Hold Time
OFF, SDA, SCL Input Voltage
OFF, SDA, SCL Input Current
SDA Output Low Voltage
fSCL
tLOW
tHIGH
tDSU
tDHOLD
VIL
VIH
IILH
0 < VILH < VOUT2
ISDA = 3mA
ISDA = 6mA
400 kHz
1.3 µs
0.6 µs
100 ns
0 0.9 µs
0.6
V
1.4
1 µA
0.4
V
0.6
LBO, LBHYS Leakage Current
V LBO = VLBHYST = 12V,
VLBI = VREF + 15mV
-0.2 0.2 µA
Note 1: Specifications to -40°C are guaranteed by design, not production tested.
_______________________________________________________________________________________ 5
5 Page 
Wireless and Satellite Handset
Power-Management ICs
IN
2.7V TO 5.5V C1
10µF
C2
0.1µF
R1 C4
619k 0.1µF
R2
562k
R3
47.6k
C5
0.22µF
C3
1µF
C6
0.22µF
BATT LX
IN0
IN1
CVH
LBI
LBHYS
MAX888
PGND
OUT0
IN2
IN4
IN5
OUT1
GND OUT2
REF
LBO
CVL RESET
C+ OUT3
C-
OUT4
SCL
IN3
SDA
ON
OFF
SYNC
OUT5
ONSTAT
DGND
L1
10µH
D1
MBR0520L
OUT0
C11 UP TO 500mA
10µF
OUT1
C7 UP TO 100mA
2.2µF
OUT2
C8 UP TO 200mA
R5 2.2µF
200k
OUT3
C9 UP TO 20mA
1µF
OUT4
C12 5.25V UP TO 100mA
10µF
OUT5
C10 UP TO 100mA
1µF
Figure 2b. Typical 1 Li+ or 3 to 4 Ni-Cell Application Circuit (MAX888)
______________________________________________________________________________________ 11
11 Page | ||
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