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参数资料
| 型号： | LTC4069EDC#TRMPBF |
| 厂商： | Linear Technology |
| 文件页数： | 8/18页 |
| 文件大小： | 0K |
| 描述： | IC CHARGER LI-ION 6-DFN |
| 标准包装： | 500 |
| 功能： | 充电管理 |
| 电池化学： | 锂离子（Li-Ion） |
| 电源电压： | 3.75 V ~ 5.5 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 6-WFDFN 裸露焊盘 |
| 供应商设备封装： | 6-DFN-EP（2x2） |
| 包装： | 带卷 (TR) |
LTC4069
OPERATION
I BAT =
V PROG
R PROG = 1000 ?
, I CHG =
The charge cycle begins when the voltage at the V CC pin
rises above 3.5V and approximately 80mV above the BAT
pin voltage, a 1% program resistor is connected from the
PROG pin to ground and the NTC pin voltage stays between
0.76 ? V CC and 0.35 ? V CC or below 0.016 ? V CC .
If the BAT pin voltage is below 2.9V, the charger goes into
trickle charge mode, charging the battery at one-tenth the
programmed charge current to bring the cell voltage up to
a safe level for charging. If the BAT pin voltage is above
4.1V, the charger will not charge the battery as the cell
is near full capacity. Otherwise, the charger goes into the
fast charge constant-current mode.
When the BAT pin approaches the final float voltage
(4.2V), the LTC4069 enters constant-voltage mode and
the charge current begins to decrease. When the current
drops to 10% of the full-scale charge current, an internal
comparator turns off the N-channel MOSFET on the CHRG
pin and the pin assumes a high impedance state.
An internal timer sets the total charge time, t TIMER (typi-
cally 4.5 hours). When this time elapses, the charge cycle
terminates and the CHRG pin assumes a high impedance
state. The charge cycle will automatically restart if the
BAT pin voltage falls below V RECHRG (typically 4.1V).
To manually restart the charge cycle, remove the input
voltage and reapply it, or momentarily float the PROG pin
and reconnect it.
Programming Charge Current
The charge current is programmed using a single resistor
from the PROG pin to ground. The battery charge current is
1000 times the current out of the PROG pin. The program
resistor and the charge current are calculated using the
following equations:
1V 1000V
I CHG R PROG
The charge current out of the BAT pin can be determined
at any time by monitoring the PROG pin voltage and using
the following equation:
? 1000
R PROG
Undervoltage Lockout (UVLO)
An internal undervoltage lockout circuit monitors the
input voltage and keeps the charger in undervoltage
lockout until V CC rises above 3.6V and approximately
80mV above the BAT pin voltage. The 3.6V UVLO circuit
has a built-in hysteresis of approximately 0.6V and the
automatic shutdown threshold has a built-in hysteresis
of approximately 50mV. During undervoltage lockout
conditions, maximum battery drain current is 4μA and
maximum supply current is 11μA.
Shutdown Mode
The LTC4069 can be disabled by floating the PROG pin.
In shutdown mode, the battery drain current is reduced
to less than 1μA and the supply current to about 20μA.
Timer and Recharge
The LTC4069 has an internal termination timer that starts
when an input voltage greater than the undervoltage lockout
threshold is applied to V CC , or when leaving shutdown and
the battery voltage is less than the recharge threshold.
At power-up or when exiting shutdown, if the battery voltage
is less than the recharge threshold, the charge time is set
to 4.5 hours. If the battery temperature is either too high
or too low, the timer will pause until the battery returns
to normal temperature. If the battery is greater than the
recharge threshold at power-up or when exiting shutdown,
the timer will not start and charging is prevented since the
battery is at or near full capacity.
Once the charge cycle terminates, the LTC4069 continu-
ously monitors the BAT pin voltage using a comparator
with a 2ms filter time. When the battery voltage falls
8
For more information www.linear.com/LTC4069
4069fc
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LTC4069EDC-TRPBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:Standalone 750mA Li-Ion Battery Charger in 2 × 2 DFN with NTC Thermistor Input |
| LTC4070 | 制造商:LINEAR 制造商全称:LINEAR 功能描述:Ultralow Voltage Step-Up Converter and Power Manager |
| LTC4070EDDB | 制造商:LINER 制造商全称:Linear Technology 功能描述:Li-Ion/Polymer Shunt Battery Charger System |
| LTC4070EDDB#PBF | 制造商:Linear Technology 功能描述:Battery Charger Li-Ion/Li-Pol 50mA 4.2V 10-Pin DFN EP Bulk 制造商:Linear Technology 功能描述:IC BATTERY CHARGER 50mA DFN-8 制造商:Linear Technology 功能描述:IC, BATTERY CHARGER, 50mA, DFN-8 制造商:Linear Technology 功能描述:IC, BATTERY CHARGER, 50mA, DFN-8; Battery Type:Li-Ion, Li-Polymer; Battery Charge Voltage:4.2V; Charge Current Max:50mA; Battery IC Case Style:DFN; No. of Pins:8; No. of Series Cells:1; Operating Temperature Min:-40C ;RoHS Compliant: Yes |
| LTC4070EDDB#TRMPBF | 功能描述:IC LI-ION/POLY BATT CHARGER 8DFN RoHS:是 类别:集成电路 (IC) >> PMIC - 电池管理 系列:- 其它有关文件:STC3100 View All Specifications 特色产品:STC3100 - Battery Monitor IC 标准包装:4,000 系列:- 功能:燃料，电量检测计/监控器 电池化学:锂离子（Li-Ion） 电源电压:2.7 V ~ 5.5 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:8-TSSOP，8-MSOP（0.118"，3.00mm 宽） 供应商设备封装:8-MiniSO 包装:带卷 (TR) 其它名称:497-10526-2 |
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