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参数资料
| 型号： | LTC4055EUF#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 18/24页 |
| 文件大小： | 0K |
| 描述： | IC USB PWR MNGR BATT CHRGR 16QFN |
| 标准包装： | 2,500 |
| 功能： | 充电管理 |
| 电池化学： | 锂离子（Li-Ion） |
| 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： | 16-WQFN 裸露焊盘 |
| 供应商设备封装： | 16-QFN（4x4） |
| 包装： | 带卷 (TR) |
LTC4055/LTC4055-1
OPERATION
The nearest 1% value for R NOM is 115k. This is the value
used to bias the NTC thermistor to get cold and hot trip
points of approximately 0°C and 44°C respectively. To
extend the delta between the cold and hot trip points a
resistor, R1, can be added in series with R NTC (see Figure 3b).
The values of the resistors are calculated as follows:
CHARGER UNDERVOLTAGE LOCKOUT
Internal undervoltage lockout circuits monitor the V IN and
V OUT voltages and keep the charger circuits of the part
shut down until V IN or V OUT rises above the undervoltage
lockout threshold. The charger UVLO circuit has a built-
in hysteresis of 125mV. Furthermore, to protect against
R NOM =
R COLD – R HOT
2 . 815 – 0 . 4086
reverse current in the power MOSFET, the charger UVLO
circuit keeps the charger shutdown if V BAT exceeds V OUT .
? ? ( R COLD HOT HOT
) – R
R 1 = ? – R
100 k ? ( )
R COLD – R HOT
? ? ( 3 . 266 – 0 . 3602 ) – 0 . 3602 ?
R 1 = 100 k ? ? ?
? 0 . 4086 ?
? 2 . 815 – 0 . 4086 ?
where R NOM is the value of the bias resistor, R HOT and
R COLD are the values of R NTC at the desired temperature
trip points. Continuing the example from before with a
desired hot trip point of 50°C:
3 . 266 – 0 . 3602
R NOM = =
2 . 815 – 0 . 4086 2 . 815 – 0 . 4086
= 120.8k, 121k is nearest 1%
? ? 0 . 4086 ? ?
? ? 2 . 815 – 0 . 4086 ? ?
= 13.3k, 13.3k is nearest 1%
The ?nal solution is as shown if Figure 3b where R NOM =
121k, R1 = 13.3k and R NTC = 100k at 25°C.
CURRENT LIMIT UNDERVOLTAGE LOCKOUT
An internal undervoltage lockout circuit monitors the input
voltage and keeps the current limit circuits of the part in
shutdown mode until V IN rises above the undervoltage
lockout threshold. The current limit UVLO circuit has a
built-in hysteresis of 125mV. Furthermore, to protect
against reverse current in the power MOSFET, the current
limit UVLO circuit keeps the current limit shutdown if
V OUT exceeds V IN . If the current limit UVLO comparator
is tripped, the current limit circuits will not come out of
If the charger UVLO comparator is tripped, the charger
circuits will not come out of shutdown until V OUT exceeds
V BAT by 50mV.
SHUTDOWN
The LTC4055/LTC4055-1 can be shut down by forcing the
SHDN pin greater than 1V. In shutdown, the currents on
IN1/IN2, OUT and BAT are decreased to less than 2.5μA
and the internal battery charge timer is reset. All power
paths are put in a Hi-Z state.
SUSPEND
The LTC4055/LTC4055-1 can be put in suspend mode by
forcing the SUSP pin greater than 1V. In suspend mode
the ideal diode function from BAT to OUT and the output
charger are kept alive. The rest of the part is shut down
to conserve current and the battery charge timer is reset
if V OUT becomes less than V BAT .
V IN and Wall Adapter Bypass Capacitor
Many types of capacitors can be used for input bypassing.
However, caution must be exercised when using multilayer
ceramic capacitors. Because of the self resonant and high
Q characteristics of some types of ceramic capacitors, high
voltage transients can be generated under some start-up
conditions, such as connecting the charger input to a hot
power source. For more information, refer to Application
Note 88.
shutdown until V OUT falls 50mV below the V IN voltage.
4055fb
18
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| LTC4056ETS8-4.2#TRM | 功能描述:IC CHARGR BATTERY L-ION TSOT23-8 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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