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参数资料
| 型号： | LTC4056ETS8-4.2#TRMPBF |
| 厂商： | Linear Technology |
| 文件页数： | 10/16页 |
| 文件大小： | 0K |
| 描述： | IC CHARGR BATTERY L-ION TSOT23-8 |
| 标准包装： | 500 |
| 功能： | 充电管理 |
| 电池化学： | 锂离子（Li-Ion） |
| 电源电压： | 4.5 V ~ 6.5 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | SOT-23-8 薄型，TSOT-23-8 |
| 供应商设备封装： | TSOT-23-8 |
| 包装： | 带卷 (TR) |
| 其它名称： | LTC4056ETS8-4.2#PBF LTC4056ETS8-4.2#PBF-ND |
LTC4056-4.2
APPLICATIO S I FOR ATIO
POWER ON
BAT < 2.8V
TIMER/SHDN RELEASED
OR
V CC > V UVLOI
SHUTDOWN MODE
I CC DROPS TO < 40 μ A
CHRG: Hi-Z if V CC < V UVLOD
WEAK PULLDOWN
OTHERWISE
TIMER/SHDN GROUNDED
OR
V CC < V UVLOD
TRICKLE CHARGE MODE
2% FULL CURRENT
CHRG: STRONG PULLDOWN
BAT > 2.9V
CHARGE MODE
FULL CURRENT
CHRG: STRONG PULLDOWN
PROGRAMMED
TIME ELAPSES
STANDBY MODE
25% PROGRAMMED
TIME ELAPSES
2.8V < BAT < 4.05V
BAT > 4.05V
NO CHARGE CURRENT
CHRG: WEAK PULLDOWN
50%
2.8V < BAT < 4.05V
PROGRAMMED
TIME ELAPSES
RECHARGE/SHORT
CHARGE MODE
CHRG: STRONG PULLDOWN
4056-4.2 F01
Figure 1. State Diagram for a Typical Charge Cycle
V +
1
V DD
External PNP Transistor
V CC
LTC4056
CHRG
8
800k
2k
μ PROCESSOR
OUT
The external PNP pass transistor must have adequate
beta, low saturation voltage and sufficient power dissipa-
tion capability (including any heat sinking, if required).
IN
4056-4.2 F02
Figure 2. Using a Microprocessor to Determine CHRG State
Recharge
If the battery voltage drops below V RECHRG (typically
4.05V) after a charge cycle has terminated, a new charge
cycle will begin. The recharge circuit integrates the BAT
pin voltage for approximately a millisecond to prevent a
transient from restarting the charge cycle. During a re-
charge cycle the timer will terminate the charge cycle after
one-half of the programmed time has elapsed.
If the battery voltage remains below V TRIKL (typically 2.8V)
during trickle charge for one-fourth of the programmed
time, the battery may be defective and the charge cycle will
end. In addition, the recharge comparator is disabled and
a new charge cycle will not begin unless the input voltage
is toggled off then on, or the TIMER/SHDN pin is momen-
To provide 700mA of charge current with the minimum
available base drive of approximately 30mA requires a
PNP beta greater than 23. If lower beta PNP transistors are
used, more base current is required from the LTC4056.
This can result in the output drive current limit being
reached, or thermal shutdown due to excessive power
dissipation.
With low supply voltages, the PNP saturation voltage
(V CESAT ) becomes important. The V CESAT must be less
than the minimum supply voltage minus the maximum
voltage drop across the internal sense resistor and bond
wires (0.20 ? ) and battery float voltage. If the PNP transis-
tor cannot achieve the low saturation voltage required,
base current will dramatically increase. This is to be
avoided for a number of reasons: output drive may reach
current limit resulting in the charger characteristics to go
out of specifications, excessive power dissipation may
force the IC into thermal shutdown, or the battery could
become discharged because some of the current from the
tarily pulled to ground.
405642f
10
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| LTC4057ES5-4.2#TR | 功能描述:IC CHARGR BATTERY L-ION TSOT23-5 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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