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参数资料
| 型号： | LTC4012IUF-3#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 13/28页 |
| 文件大小： | 0K |
| 描述： | IC CTLR BATT CHARGER CC/CV 20QFN |
| 标准包装： | 2,500 |
| 功能： | 充电管理 |
| 电池化学： | 多化学 |
| 电源电压： | 6 V ~ 28 V |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 20-WFQFN 裸露焊盘 |
| 供应商设备封装： | 20-QFN 裸露焊盘（4x4） |
| 包装： | 带卷 (TR) |
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LTC4012-3
OPERATION
LTC4012-3
WATCHDOG
TIMER
SYSTEM
POWER
2
11
CLP
BAT
OSCILLATOR
CLOCK
S
R D
Q
PWM
LOGIC
TGATE
BGATE
19
16
L1
+
CSP
15
R IN
+
CC
+
–
R1
CA
–
CSN
PROG
14
13
R IN
R SENSE
–
V SENSE
I CHRG
R PROG
C PROG
EA
FROM ICL AMP
V FB
9
+
1.2085V
ITH
12
LOOP
COMPENSATION
4012-3 F01
Figure 1. PWM Circuit Diagram
V PROG =
+ 11 . 67 μA ? R PROG
BulkCharge
When soft-start is complete, the LTC4012-3 begins sourc-
ing the current programmed by the external components
connected to CSP, CSN and PROG. Some batteries may
require a small conditioning trickle current if they are heavily
discharged. As shown in the Applications Information sec-
tion, the LT4012-3 can address this need through a variety
of low current circuit techniques on the PROG pin. Once
a suitable cell voltage has been reached, charge current
can be switched to a higher, bulk charge value.
End of Charge and CHRG Output
As the battery approaches the programmed output volt-
age, charge current will begin to decrease. The open-drain
CHRG output can indicate when the current drops to 10%
of its programmed full-scale value by turning off the strong
pull-down (open-drain FET) and turning on a weak 25μA
pull-down current. This weak pull-down state is latched
until the part enters shutdown or the sensed current rises
to roughly C/6. C/10 indication will not be set if charge
current has been reduced due to adapter input current
limiting. As the charge current approaches 0A, the PWM
continues to operate in full continuous mode. This avoids
generation of audible noise, allowing bulk ceramic capaci-
tors to be used in the application.
Charge Current Monitoring
When the LTC4012-3 is charging, the voltage on the PROG
pin varies in direct proportion to the charge current. Refer-
ring to Figure 1, the nominal PROG voltage is given by:
I CHRG ? R SENSE ? R PROG
R IN
Voltage tolerance on PROG is limited by the charge current
accuracy specified in the Electrical Characteristics table.
Refer to the Applications Information section on program-
ming charge current for additional details.
40123fb
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| LTC4020EUHF#PBF | 制造商:Linear Technology 功能描述:Battery Charger Lead-Acid/Li-FePO4/Li-Ion/Li-Pol 20000mA 55V 38-Pin QFN EP 制造商:Linear Technology 功能描述:IC BATT CHARGER 55V BB 38QFN 制造商:Linear Technology 功能描述:BATTERY CHARGER, 20A, QFN-38 制造商:Linear Technology 功能描述:BATTERY CHARGER, 20A, QFN-38, Input Voltage:55V, Battery Charge Voltage:55V, Charge Current Max:20A, Battery IC Case Style:QFN, No. of Pins:38, No. of Series Cells:12, Operating Temperature Min:-40C, Operating Temperature Max:125C , RoHS Compliant: Yes |
| LTC4020EUHF#TRPBF | 制造商:Linear Technology 功能描述:Battery Charger Lead-Acid/Li-FePO4/Li-Ion/Li-Pol 20000mA 55V 38-Pin QFN EP T/R 制造商:Linear Technology 功能描述:IC BATT CHARGER 55V BB 38QFN 制造商:Linear Technology 功能描述:BATTERY CHARGER, 20A, QFN-38, Input Voltage:55V, Battery Charge Voltage:55V, Charge Current Max:20A, Battery IC Case Style:QFN, No. of Pins:38, No. of Series Cells:12, Operating Temperature Min:-40C, Operating Temperature Max:125C , RoHS Compliant: Yes |
| LTC4020IUHF#PBF | 制造商:Linear Technology 功能描述:Battery Charger Lead-Acid/Li-FePO4/Li-Ion/Li-Pol 20000mA 55V 38-Pin QFN EP 制造商:Linear Technology 功能描述:IC BATT CHARGER 55V BB 38QFN 制造商:Linear Technology 功能描述:BATTERY CHARGER, 20A, QFN-38 制造商:Linear Technology 功能描述:BATTERY CHARGER, 20A, QFN-38, Input Voltage:55V, Battery Charge Voltage:55V, Charge Current Max:20A, Battery IC Case Style:QFN, No. of Pins:38, No. of Series Cells:12, Operating Temperature Min:-40C, Operating Temperature Max:125C , RoHS Compliant: Yes |
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| LTC4050 | 制造商:LINEAR 制造商全称:LINEAR 功能描述:Standalone 250mA Li-Ion Battery Charger in 2 × 2 DFN |
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