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參數(shù)資料
| 型號(hào)： | LT1621CGN |
| 廠商： | Linear Technology |
| 文件頁(yè)數(shù)： | 10/12頁(yè) |
| 文件大?。?/td> | 0K |
| 描述： | IC AMP R-R CURRENT SENSE 16-SSOP |
| 標(biāo)準(zhǔn)包裝： | 100 |
| 放大器類型： | 電流檢測(cè) |
| 電路數(shù)： | 2 |
| 輸出類型： | 滿擺幅 |
| 電流 - 輸入偏壓： | 20nA |
| 電壓 - 輸入偏移： | 6000µV |
| 電流 - 電源： | 2.3mA |
| 電壓 - 電源，單路/雙路(±)： | 4.5 V ~ 5.5 V |
| 工作溫度： | 0°C ~ 70°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 16-SSOP（0.154"，3.90mm 寬） |
| 供應(yīng)商設(shè)備封裝： | 16-SSOP |
| 包裝： | 管件 |
7
LT1620/LT1621
APPLICATIONS INFORMATION
WU
U
between the IN+ and IN– inputs. Effective decoupling of
supply rails is also imperative in these types of circuits, as
large current transients are the norm. Power supply
decoupling should be placed as close as possible to the
ICs, and each IC should have a dedicated capacitor.
Design Equations
Sense resistor: RSENSE = VID/IMAX
Current limit programming voltage:
VPROG = VCC –[(10)(VID)]
Voltage feedback resistors:
RF1/RF2 = (VBATT(FLOAT) – 1.19)/1.19
End-of-Cycle Flag Application
Figure 3 illustrates additional connections using the
LT1620GN, including the end-of-cycle (EOC) flag feature.
The EOC threshold is used to notify the user when the
required load current has fallen to a programmed value,
usually a given percentage of maximum load.
The end-of-cycle output (MODE) is an open-collector pull-
down; the circuit in Figure 3 uses a 10k pull-up resistor on
the MODE pin, connected to VCC.
The EOC flag threshold is determined through program-
ming VPROG2. The magnitude of this threshold corre-
sponds to 20 times the voltage across the sense amplifier
inputs.
As mentioned in the previous circuit discussion, the
charging current level is set to correspond to a sense
voltage of 80mV. The circuit in Figure 3 uses a resistor
divider to create a programming voltage (VCC –VPROG2)of
0.5V. The MODE flag will therefore trip when the charging
current sense voltage has fallen to 0.5V/20 or 0.025V.
Thus, the end-of-cycle flag will trip when the charging
current has been reduced to about 30% of the maximum
value.
Input Current Sensing Application
Monitoring the load placed on the VIN supply of a charging
system is achieved by placing a second current sense
resistor in front of the charger VIN input. This function is
useful for systems that will overstress the input supply
(wall adapter, etc.) if both battery charging and other
system functions simultaneously require high currents.
This allows use of input supply systems that are capable
of driving full-load battery charging and full-load system
requirements, but not simultaneously. If the input supply
current exceeds a predetermined value due to a combina-
tion of high battery charge current and external system
demand, the input current sense function automatically
Figure 3. End-of-Cycle Flag Implementation with LT1620GN
Figure 4. Input Current Sensing Application
AVG
PROG
PROG2
AVG2
VCC
IN+
SENSE
IOUT
VEE
MODE
IN–
LT1620GN
LT1620/21 F03
CONNECTED AS IN FIGURE 2
R1
5.5k
R2
50k
C2
3.3
F
C1, 3.3
F
R3
10k
END-OF-CYCLE
(ACTIVE LOW)
+
AVG
PROG
VCC
IN+
SENSE
LT1620MS8
1
2
3
4
8
7
IOUT
GND
IN–
6
5
VSW
7
VIN
5
81
VFB
6
S/S
2
IFB
4
GND
TAB
3
C1
1
F
22
F
RP1
3k
1%
RP2
12k
1%
C2
1
F
R1
0.033
L1B
10
H
22
F
TO
SYSTEM LOAD
4.7
F
L1A
10
H
24
VC
0.22
F
0.1
F
X7R
LT1513
RUN
5V
57k
6.4k
22
F
× 2
MBRS340
VBATT = 12.3V
1620/21 F04
RSENSE
0.1
+
Li-ION
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| LT1621CGN#PBF | 功能描述:IC AMP R-R CURRENT SENSE 16-SSOP RoHS:是 類別:集成電路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 標(biāo)準(zhǔn)包裝:50 系列:- 放大器類型:J-FET 電路數(shù):2 輸出類型:- 轉(zhuǎn)換速率:3.5 V/µs 增益帶寬積:1MHz -3db帶寬:- 電流 - 輸入偏壓:30pA 電壓 - 輸入偏移:2000µV 電流 - 電源:200µA 電流 - 輸出 / 通道:- 電壓 - 電源，單路/雙路(±):7 V ~ 36 V，±3.5 V ~ 18 V 工作溫度:0°C ~ 70°C 安裝類型:通孔 封裝/外殼:8-DIP（0.300"，7.62mm） 供應(yīng)商設(shè)備封裝:8-PDIP 包裝:管件 |
| LT1621CGN#TR | 功能描述:IC AMP CURR SENSE RR DUAL 16SSOP RoHS:否 類別:集成電路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 標(biāo)準(zhǔn)包裝:50 系列:- 放大器類型:J-FET 電路數(shù):2 輸出類型:- 轉(zhuǎn)換速率:3.5 V/µs 增益帶寬積:1MHz -3db帶寬:- 電流 - 輸入偏壓:30pA 電壓 - 輸入偏移:2000µV 電流 - 電源:200µA 電流 - 輸出 / 通道:- 電壓 - 電源，單路/雙路(±):7 V ~ 36 V，±3.5 V ~ 18 V 工作溫度:0°C ~ 70°C 安裝類型:通孔 封裝/外殼:8-DIP（0.300"，7.62mm） 供應(yīng)商設(shè)備封裝:8-PDIP 包裝:管件 |
| LT1621CGN#TRPBF | 功能描述:IC AMP R-R CURRENT SENSE 16-SSOP RoHS:是 類別:集成電路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 標(biāo)準(zhǔn)包裝:50 系列:- 放大器類型:J-FET 電路數(shù):2 輸出類型:- 轉(zhuǎn)換速率:3.5 V/µs 增益帶寬積:1MHz -3db帶寬:- 電流 - 輸入偏壓:30pA 電壓 - 輸入偏移:2000µV 電流 - 電源:200µA 電流 - 輸出 / 通道:- 電壓 - 電源，單路/雙路(±):7 V ~ 36 V，±3.5 V ~ 18 V 工作溫度:0°C ~ 70°C 安裝類型:通孔 封裝/外殼:8-DIP（0.300"，7.62mm） 供應(yīng)商設(shè)備封裝:8-PDIP 包裝:管件 |
| LT1621IGN | 功能描述:IC AMP R-R CURRENT SENSE 16-SSOP RoHS:否 類別:集成電路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 標(biāo)準(zhǔn)包裝:73 系列:Over-The-Top® 放大器類型:通用 電路數(shù):4 輸出類型:滿擺幅 轉(zhuǎn)換速率:0.07 V/µs 增益帶寬積:200kHz -3db帶寬:- 電流 - 輸入偏壓:1nA 電壓 - 輸入偏移:285µV 電流 - 電源:50µA 電流 - 輸出 / 通道:25mA 電壓 - 電源，單路/雙路(±):2 V ~ 44 V，±1 V ~ 22 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:16-WFDFN 裸露焊盤 供應(yīng)商設(shè)備封裝:16-DFN-EP（5x3） 包裝:管件 |
| LT1621IGN#PBF | 功能描述:IC AMP R-R CURRENT SENSE 16-SSOP RoHS:是 類別:集成電路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 標(biāo)準(zhǔn)包裝:73 系列:Over-The-Top® 放大器類型:通用 電路數(shù):4 輸出類型:滿擺幅 轉(zhuǎn)換速率:0.07 V/µs 增益帶寬積:200kHz -3db帶寬:- 電流 - 輸入偏壓:1nA 電壓 - 輸入偏移:285µV 電流 - 電源:50µA 電流 - 輸出 / 通道:25mA 電壓 - 電源，單路/雙路(±):2 V ~ 44 V，±1 V ~ 22 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:16-WFDFN 裸露焊盤 供應(yīng)商設(shè)備封裝:16-DFN-EP（5x3） 包裝:管件 |
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