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参数资料
| 型号： | LTC4052EMS8E-4.2 |
| 厂商： | Linear Technology |
| 文件页数： | 4/12页 |
| 文件大小： | 0K |
| 描述： | IC CHARGER PULSE LI-ION 8-MSOP |
| 标准包装： | 50 |
| 功能： | 充电管理 |
| 电池化学： | 锂离子（Li-Ion） |
| 电源电压： | 4.5 V ~ 10 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）裸露焊盘 |
| 供应商设备封装： | 8-MSOP-EP |
| 包装： | 管件 |
LTC4052-4.2
TYPICAL PERFOR A CE CHARACTERISTICS
Switch On-Resistance vs
105.8
105.6
105.4
105.2
Overcurrent Sense Voltage
650
600
550
500
450
Temperature
V BAT = 2.6V
105.0
104.8
400
350
300
V BAT = 4V
104.6
–50 –25
0
25
50
75
100
125
250
–50 –25
0
25
50
75
100
125
TEMPERATURE ( ° C)
4053 G07
PI FU CTIO S
SENSE (Pin 1): Overcurrent Sense Input. A sense resistor
(R SENSE ) should be connected from V IN to the SENSE pin
to program the current limit level. When overcurrent limit
is tripped, the pass transistor immediately turns off and
turns back on after a 640ms time-out period (C TIMER =
0.1 μ F). The on-off cycle will continue as long as the
overcurrent condition persists or until the timer runs out.
If overcurrent protection is not needed, short SENSE to
V IN .
ACPR (Pin 2): AC Wall Adapter Present Open-Drain Out-
put. When the input voltage (wall adapter) is applied to the
LTC4052, this pin is pulled to ground by an internal
N-channel MOSFET capable of driving an LED.
V IN (Pin 3): Positive Input Supply Voltage (4.5V ≤ V IN ≤
10V). Bypass this pin with a 1 μ F capacitor in series with a
4.7 ? resistor.
GND (Pin 4): Electrical Ground Connection and provides
a thermal path from the IC to the PC board copper. The
exposed backside of the package is also ground and must
be soldered to the PC board for maximum power dissipa-
tion.
TIMER (Pin 5): Timer Set Pin. The timer period is pro-
TEMPERATURE ( ° C)
4053 G08
ON time, minimum OFF time and the overcurrent time-out
period all scale with t TIMER .
CHRG (Pin 6): Charge Status Open-Drain Output. When a
depleted battery is being charged, the CHRG pin is pulled
to ground by an internal N-channel MOSFET capable of
driving an LED. Once the duty cycle at the GATE pin drops
below 10%, the N-MOSFET turns off and a weak 40 μ A
current source to ground turns on to indicate a near end-
of-charge C/10 condition. When a time-out occurs or the
input supply is removed, the CHRG pin becomes high
impedance.
GATE (Pin 7): Gate Drive Output Pin for Internal and
External Pass Transistors. An external N-MOSFET transis-
tor can be connected in parallel with the internal transistor
to reduce the on-resistance for higher charge current. In
this case, an external blocking diode on V IN is required to
prevent damage to the battery if V IN is shorted to ground.
A 10 μ A current source pulls this pin up to the charge pump
voltage when turned on and a 40 μ A current source pulls it
down to ground to turn it off. If an overcurrent condition
is detected, the GATE pin is immediately pulled to ground.
The voltage at this pin is internally clamped to 12V above
the GND pin.
grammed by a capacitor (C TIMER ) to ground. The timer
period is: t TIMER = (C TIMER ? 3Hr)/(0.1 μ F). The minimum
405242f
4
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| LTC4053EDD-4.2#TRPBF | 功能描述:IC CHARGER BATTERY USB 10-DFN 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 |
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