参数资料
| 型号： | LT1621CGN |
| 厂商： | Linear Technology |
| 文件页数： | 9/12页 |
| 文件大小： | 0K |
| 描述： | IC AMP R-R CURRENT SENSE 16-SSOP |
| 标准包装： | 100 |
| 放大器类型： | 电流检测 |
| 电路数： | 2 |
| 输出类型： | 满摆幅 |
| 电流 - 输入偏压： | 20nA |
| 电压 - 输入偏移： | 6000µV |
| 电流 - 电源： | 2.3mA |
| 电压 - 电源，单路/双路(±)： | 4.5 V ~ 5.5 V |
| 工作温度： | 0°C ~ 70°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 16-SSOP（0.154"，3.90mm 宽） |
| 供应商设备封装： | 16-SSOP |
| 包装： | 管件 |
6
LT1620/LT1621
APPLICATIONS INFORMATION
WU
U
TG
COSC
LTC1435
IN–
GND
IOUT
SENSE
IN+
LT1620MS8
5
6
7
8
4
3
VBATT
16.8V
VIN
17.3V TO 28V
LT1620/21 F02
C11, 56pF
C12, 0.1
F
RUN/SS
ITH
SFB
SGND
VOSENSE
SENSE–
SENSE+
BOOST
SW
VIN
INTVCC
BG
PGND
EXTVCC
VCC
PROG
AVG
2
1
C10
100pF
C9, 100pF
R1
1k
C14
1nF
C13
0.033
F
X7R
C17, 0.01
F
R2
1.5M
C4
0.1
F
D2*
D1*
C5, 0.1
F
Si4412DY
L1
27
H
C6
0.1
F
C7
4.7
F
RSENSE
0.025
C15
0.1
F
C16
0.1
F
RP1
3k
1%
RP2
15.75k
1%
C18
0.1
F
RF2
110k
0.1%
RF1
1.44M
0.1%
C8, 100pF
C3
22
F
35V
C1
22
F
35V
C2
22
F
35V
RUN
+
* D1, D2: CENTRAL
SEMICONDUCTOR CMDSH-3
Li-ION
Figure 2. LT1620/LTC1435 Battery Charger
Charge Current Programming
Output current delivered during current mode operation is
determined through programming the voltage at the PROG
pin (VPROG). As mentioned above, optimum performance
is obtained with (VCC – VPROG) = 0.8V. The LT1620 is
biased with a precision 5V supply produced by the LTC1435,
enabling use of a simple resistor divider from VCC to
ground for a VPROG reference. Using the desired 2.5k
Thevenin impedance at the PROG pin, values of RP1 = 3k
and RP2 = 15.75k are readily calculated. The PROG pin
should be decoupled to the VCC supply.
Different values of charging current can be obtained by
changing the values of the resistors in the VPROG setting
divider to raise or lower the value of the programming
voltage, or by changing the sense resistor to an appropri-
ate value as described above.
Output Float Voltage
The 3.2A charger circuit is designed for a 4-cell Li-Ion
battery, or a battery float voltage of 16.8V. This voltage is
programmed through a resistor divider feedback to the
LTC1435 VOSENSE pin, referencing its 1.19V bandgap
voltage. Resistor values are determined through the rela-
tion: RF1 = (VBATT – 1.19)/(1.19/RF2). Setting RF2 = 110k
yields RF1 = 1.44M.
Other Decoupling Concerns
The application schematic shown in Figure 2 employs
several additional decoupling capacitors. Due to the inher-
ently noisy environment created in switching applications,
decoupling of sensitive nodes is prudent. As noted in the
schematic, decoupling capacitors are included on the
current programming pin (PROG) to the VCC rail and
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LT1621CGN#PBF | 功能描述:IC AMP R-R CURRENT SENSE 16-SSOP RoHS:是 类别:集成电路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 标准包装:50 系列:- 放大器类型:J-FET 电路数:2 输出类型:- 转换速率:3.5 V/µs 增益带宽积:1MHz -3db带宽:- 电流 - 输入偏压:30pA 电压 - 输入偏移:2000µV 电流 - 电源:200µA 电流 - 输出 / 通道:- 电压 - 电源，单路/双路(±):7 V ~ 36 V，±3.5 V ~ 18 V 工作温度:0°C ~ 70°C 安装类型:通孔 封装/外壳:8-DIP（0.300"，7.62mm） 供应商设备封装:8-PDIP 包装:管件 |
| LT1621CGN#TR | 功能描述:IC AMP CURR SENSE RR DUAL 16SSOP RoHS:否 类别:集成电路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 标准包装:50 系列:- 放大器类型:J-FET 电路数:2 输出类型:- 转换速率:3.5 V/µs 增益带宽积:1MHz -3db带宽:- 电流 - 输入偏压:30pA 电压 - 输入偏移:2000µV 电流 - 电源:200µA 电流 - 输出 / 通道:- 电压 - 电源，单路/双路(±):7 V ~ 36 V，±3.5 V ~ 18 V 工作温度:0°C ~ 70°C 安装类型:通孔 封装/外壳:8-DIP（0.300"，7.62mm） 供应商设备封装:8-PDIP 包装:管件 |
| LT1621CGN#TRPBF | 功能描述:IC AMP R-R CURRENT SENSE 16-SSOP RoHS:是 类别:集成电路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 标准包装:50 系列:- 放大器类型:J-FET 电路数:2 输出类型:- 转换速率:3.5 V/µs 增益带宽积:1MHz -3db带宽:- 电流 - 输入偏压:30pA 电压 - 输入偏移:2000µV 电流 - 电源:200µA 电流 - 输出 / 通道:- 电压 - 电源，单路/双路(±):7 V ~ 36 V，±3.5 V ~ 18 V 工作温度:0°C ~ 70°C 安装类型:通孔 封装/外壳:8-DIP（0.300"，7.62mm） 供应商设备封装:8-PDIP 包装:管件 |
| LT1621IGN | 功能描述:IC AMP R-R CURRENT SENSE 16-SSOP RoHS:否 类别:集成电路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 标准包装:73 系列:Over-The-Top® 放大器类型:通用 电路数:4 输出类型:满摆幅 转换速率:0.07 V/µs 增益带宽积:200kHz -3db带宽:- 电流 - 输入偏压:1nA 电压 - 输入偏移:285µV 电流 - 电源:50µA 电流 - 输出 / 通道:25mA 电压 - 电源，单路/双路(±):2 V ~ 44 V，±1 V ~ 22 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:16-WFDFN 裸露焊盘 供应商设备封装:16-DFN-EP（5x3） 包装:管件 |
| LT1621IGN#PBF | 功能描述:IC AMP R-R CURRENT SENSE 16-SSOP RoHS:是 类别:集成电路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 标准包装:73 系列:Over-The-Top® 放大器类型:通用 电路数:4 输出类型:满摆幅 转换速率:0.07 V/µs 增益带宽积:200kHz -3db带宽:- 电流 - 输入偏压:1nA 电压 - 输入偏移:285µV 电流 - 电源:50µA 电流 - 输出 / 通道:25mA 电压 - 电源，单路/双路(±):2 V ~ 44 V，±1 V ~ 22 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:16-WFDFN 裸露焊盘 供应商设备封装:16-DFN-EP（5x3） 包装:管件 |
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