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參數(shù)資料
| 型號： | MAX8868 |
| 廠商： | Maxim Integrated Products, Inc. |
| 英文描述： | Low-Noise, Low-Dropout, 150mA Linear Regulators in SOT23 |
| 中文描述： | 低噪聲、低壓差、150mA線性穩(wěn)壓器，SOT23封裝 |
| 文件頁數(shù)： | 1/20頁 |
| 文件大小： | 257K |
| 代理商： | MAX8868 |
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.
General Desc ription
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 I
2
C-
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.
Applic ations
Satellite Phones
Wireless Handsets
Private Mobile Radio (PMR)
GSM Cellular/PCS Telephones
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
I
2
C-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)
M
Wireless and S atellite Handset
Power-Management ICs
________________________________________________________________ Maxim Integrated Products
1
BATT
LBO
SCL
SDA
LBI
IN
2.7V TO12V
I
2
C-COMPATIBLE
SERIAL INTERFACE
LOW-BATTERY
DETECT
ON/OFF CONTROL
(OPTIONAL)
LX
MAIN POWER (UP TO500mA)
PGND
OUT0
Tx SECTION POWER (UP TO100mA)
DSP POWER (UP TO200mA)
3V/5V SIM CARD POWER (UP TO20mA)
LCD/VCO/TXCOPOWER (UP TO100mA)
POWER-ON RESET
Rx SECTION POWER (UP TO100mA)
OUT1
MAX886
MAX888
OUT2
RESET
OUT3
OUT4
OUT5
ONSTAT
GND
OFF
SYNC
C+
C-
ON
ON STATUS
19-1438; Rev 0; 3/99
PART
MAX886
ECJ *
MAX888
ECJ
*
Future product—contact factory for availability.
-40°C to +85°C
-40°C to +85°C
TEMP. RANGE
PIN-PACKAGE
32 TQFP
32 TQFP
EVALUATION KIT MANUAL
FOLLOWS DATA SHEET
Typic al Operating Circ uit
Ordering Information
Pin Configuration appears at end of data sheet.
I
2
C is a trademark of Philips Corp.
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