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参数资料
| 型号： | LTC1731CS8-4.2 |
| 厂商： | LINEAR TECHNOLOGY CORP |
| 元件分类： | 稳压器 |
| 英文描述： | BATTERY CHARGE CONTROLLER, PDSO8 |
| 封装： | 0.150 INCH, PLASTIC, SO-8 |
| 文件页数： | 3/8页 |
| 文件大小： | 99K |
| 代理商： | LTC1731CS8-4.2 |
3
LTC1731
LINEAR TECHNOLOGY CONFIDENTIAL
Note 1: Absolute Maximum Ratings are those values beyond which the life
of a device may be impaired.
TA = 25°C, VCC = 6V unless otherwise noted.
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
VASD
Automatic Shutdown Threshold Voltage
(VCC – VBAT) High to Low
54
mV
(VCC – VBAT) Low to High
69
mV
VDIS
Voltage Mode Disable Threshold Voltage
(VCC – VTIMER)
0.4
V
IPROG
PROG Pin Current
Internal Pull-Up Current, No RPROG
2.5
A
PROG Pin Source Current,
VPROG ≤ 5mV
300
A
VPROG
PROG Pin Voltage
RPROG =19.6k
2.457
V
ICHRG
CHRG Pin Weak Pull-Down Current
VCHRG = 1V
100
A
VCHRG
CHRG Pin Output Low Voltage
ICHRG = 5mA
0.2
V
IC/10
End of Charge Indication Current Level
RPROG = 19.6k, RSENSE = 0.2
25
50
100
mA
tTIMER
TIMER Accuracy
CTIMER = 0.1F10
%
VCLAMP
DRV Pin Clamp Voltage
VCLAMP = VCC – VDRV, IDRIVE = 50A
5
6.5
8
V
ELECTRICAL CHARACTERISTICS
PIN FUNCTIONS
UU
U
BAT (Pin 1): Battery Sense Input. A bypass capacitor of at
least 10
F is required to keep the loop stable when the
battery is not connected. A precision internal resistor
divider sets the final float potential on this pin. The resistor
divider is disconnected in sleep mode.
CHRG (Pin 2): Open-Drain Charge Status Output. When
the battery is being charged, the CHRG pin is pulled low by
an internal N-channel MOSFET. When the charge current
drops to 10% of the full-scale current for at least 0.32
seconds, the N-channel MOSFET turns off and a 100
A
current source is connected from the CHRG pin to GND.
When the timer runs out or the input supply is removed,
the current source will be disconnected and the CHRG pin
is forced into a high impedance state.
TIMER (Pin 3): Timer Capacitor and Constant-Voltage
Mode Disable Input Pin. The timer period is set by placing
a capacitor, CTIMER, to GND. The timer period is tTIMER =
CTIMER 3 hours)/(0.1F). When the TIMER pin is con-
nected to VCC, the constant-voltage mode is disabled and
the chip will operate in constant-current mode only. Short
the TIMER pin to GND to disable the internal timer
function.
GND (Pin 4): Ground.
PROG (Pin 5): Charge Current Program and Shutdown
Input Pin. The charge current is programmed by connect-
ing a resistor, RPROG to ground. The charge current is IBAT
= (VPROG 800)/(RPROG RSENSE). The IC can be forced
into shutdown by floating the PROG pin and allowing the
internal 2.5
A current source to pull the pin above the
2.457V shutdown threshold voltage.
DRV (Pin 6): Drive Output Pin for the P-Channel MOSFET
or PNP Transistor. The impedance is high at this pin,
therefore, a high gain PNP pass transistor should be used.
The DRV pin is internally clamped to 8V (max) below VCC.
VCC (Pin 7): Positive Input Supply Voltage. When VBAT is
within 54mV of VCC, the LTC1731 is forced into sleep
mode, dropping ICC to 5A. VCC ranges from 4.5V to 15V.
Bypass this pin with a 1
F capacitor.
SENSE (Pin 8): Current Sense Input. A sense resistor,
RSENSE, must be connected from VCC to the SENSE pin.
This resistor is chosen using the following equation:
RSENSE = (VPROG 800)/(RPROG IBAT)
Note 2: The LTC1731 is guaranteed to meet specified performance from
0
°C to 70°C and are designed, characterized and expected to meet these
extended temperature limits, but are not tested a –40
°C and 85°C.
Guaranteed I grade parts are available, consult factory.
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| LTC1731EMS8-4.1 | 功能描述:IC CTRLR BATT CHRGR LI-ION 8MSOP RoHS:否 类别:集成电路 (IC) >> PMIC - 电池管理 系列:- 标准包装:61 系列:- 功能:电源管理 电池化学:锂离子（Li-Ion）、锂聚合物（Li-Pol） 电源电压:4.35 V ~ 5.5 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:22-WFDFN 裸露焊盘 供应商设备封装:22-DFN（6x3）裸露焊盘 包装:管件 |
| LTC1731EMS8-4.1#PBF | 功能描述:IC CTRLR BATT CHRGR LI-ION 8MSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 电池管理 系列:- 标准包装:61 系列:- 功能:电源管理 电池化学:锂离子（Li-Ion）、锂聚合物（Li-Pol） 电源电压:4.35 V ~ 5.5 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:22-WFDFN 裸露焊盘 供应商设备封装:22-DFN（6x3）裸露焊盘 包装:管件 |
| LTC1731EMS8-4.1#TR | 功能描述:IC CTRLR BATT CHRGR LI-ION 8MSOP RoHS:否 类别:集成电路 (IC) >> PMIC - 电池管理 系列:- 标准包装:61 系列:- 功能:电源管理 电池化学:锂离子（Li-Ion）、锂聚合物（Li-Pol） 电源电压:4.35 V ~ 5.5 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:22-WFDFN 裸露焊盘 供应商设备封装:22-DFN（6x3）裸露焊盘 包装:管件 |
| LTC1731EMS8-4.1#TRPBF | 功能描述:IC CTRLR BATT CHRGR LI-ION 8MSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 电池管理 系列:- 标准包装:61 系列:- 功能:电源管理 电池化学:锂离子（Li-Ion）、锂聚合物（Li-Pol） 电源电压:4.35 V ~ 5.5 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:22-WFDFN 裸露焊盘 供应商设备封装:22-DFN（6x3）裸露焊盘 包装:管件 |
| LTC1731EMS8-4.2 | 功能描述:IC CTRLR BATT CHRGR LI-ION 8MSOP RoHS:否 类别:集成电路 (IC) >> PMIC - 电池管理 系列:- 标准包装:61 系列:- 功能:电源管理 电池化学:锂离子（Li-Ion）、锂聚合物（Li-Pol） 电源电压:4.35 V ~ 5.5 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:22-WFDFN 裸露焊盘 供应商设备封装:22-DFN（6x3）裸露焊盘 包装:管件 |
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