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参数资料
| 型号： | LTC4056ETS8-4.2#TR |
| 厂商： | Linear Technology |
| 文件页数： | 13/16页 |
| 文件大小： | 0K |
| 描述： | IC CHARGR BATTERY L-ION TSOT23-8 |
| 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： | 4.5 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： | LTC4056ETS8-4.2TR |
LTC4056-4.2
TYPICAL APPLICATIO S
USB Charging
The applications shown in Figures 5 and 6 are USB Li-Ion
chargers with automatic PowerPath TM control. In order to
comply with USB power specifications a Li-Ion battery
charger must be able to limit the current draw from the
USB power port to 500mA, operate at input voltages as low
as 4.75V (ignoring resistive drops in the cable and connec-
tors which further reduce this value to 4.4V), and have a
low current standby mode.
As described in Undervoltage Charge Current Limiting, the
LTC4056 will automatically reduce charge current if the
input supply voltage reaches V UVCL (typically 4.575V).
This feature ideally solves the additional 350mV of resis-
tive drop that the USB power specification requires. If an
LTC4056 is connected to a particularly resistive USB
cable, then charge current will be reduced to ensure that
USB
POWER
the input voltage does not drop below the undervoltage
lockout threshold.
The TIMER/SHDN pin can be used to put the LTC4056 into
a low current standby mode. By pulling TIMER/SHDN to
GND, the LTC4056 and LTC4412 will draw about 50 μ A to
60 μ A combined from the USB power port.
The LTC4056 actually regulates the current delivered to
the I SENSE pin (rather than the BAT pin current). This fact
allows the 500mA maximum USB power port consump-
tion to be easily enforced by tying all system loads to the
I SENSE pin and programming the charger to supply just
under 500mA (Figures 5 and 6 are programmed for
490mA). The total impedance between the V CC pin and
I SENSE pin is typically 0.2 ? , so the maximum drop is just
100mV (at 500mA).
PowerPath is a trademark of Linear Technology Corporation.
R1
750 ?
RED
8
7
LTC4056
CHRG V CC
TIMER/SHDN I SENSE
1
2
M2B
1/2 IRF7329
ON 0FF
M1
2N7002
R2
1.87k
6
5
BAT
PROG
DRIVE
GND
3
4
C3
1 μ F
Q1
ZXT1M322
BAT
M2A
1/2 IRF7329
SYSTEM
LOAD
V IN
SENSE
C1
1 μ F
C4
4.7 μ F
R5
0.5 ?
+
C2
0.1 μ F
Li-Ion
LTC4412
GND GATE
CTL STAT
R3
470k
4056-4.2 F05
Figure 5. USB Charging and Automatic PowerPath Control with Auxiliary P-Channel MOSFET for Lowest Loss
USB
POWER
R1
750 ?
RED
8
LTC4056
CHRG
V CC
1
MBRS130LT3
7
TIMER/SHDN I SENSE
2
ON 0FF
M1
2N7002
C1
1 μ F
R2
1.87k
6
5
BAT
PROG
C4
4.7 μ F
R5
0.5 ?
DRIVE
GND
3
4
C3
1 μ F
+
Q1
ZXT1M322
C2
0.1 μ F
Li-Ion
BAT
V IN SENSE
LTC4412
GND GATE
CTL STAT
M2
Si2315BDS
R4
750 ?
R3
470k
SYSTEM
LOAD
GREEN
M3
Si1301DL
4056-4.2 F06
Figure 6. USB Charging and Automatic PowerPath Control with LTC4412 in Comparator Mode
405642f
13
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LTC4057 | 制造商:LINER 制造商全称:Linear Technology 功能描述:Linear Li-Ion Battery Charger with Thermal Regulation in ThinSOT |
| LTC4057-4.2 | 制造商:LINER 制造商全称:Linear Technology 功能描述:Linear Li-Ion Battery Charger with Thermal Regulation in ThinSOT |
| LTC4057ES5-4.2 | 制造商:Linear Technology 功能描述:Battery Charger Li-Ion 500mA 4.2V 5-Pin TSOT-23 |
| LTC4057ES5-4.2#PBF | 制造商:Linear Technology 功能描述:Battery Charger Li-Ion 500mA 4.2V 5-Pin TSOT-23 |
| 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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