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參數資料
| 型號： | LT1621IGN#TRPBF |
| 廠商： | Linear Technology |
| 文件頁數： | 1/12頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC AMP R-R CURRENT SENSE 16-SSOP |
| 標準包裝： | 2,500 |
| 放大器類型： | 電流檢測 |
| 電路數： | 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： | -40°C ~ 85°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 16-SSOP（0.154"，3.90mm 寬） |
| 供應商設備封裝： | 16-SSOP |
| 包裝： | 帶卷 (TR) |
1
LT1620/LT1621
Rail-to-Rail Current
Sense Amplifier
S
FEATURE
s
Accurate Output Current Programming
s
Usable in Charging Applications Up to 32V Output
s
Programmable Load Current Monitor for End-of-
Charging-Cycle Notification (16-Pin Version)
s
Dual Function IC (LT1621) Allows Convenient
Integration of Load and Input Current Sensing
s
Level-Shifted Current Sense Output for Current Mode
PWM Controllers
s
Can be Used for NiCd, NiMH, Lead-Acid and Lithium-
Ion Battery Charging
s
Greater than 96% Efficiency Possible in Charger
Applications
s
High Output Currents Possible: > 10A
Easily Obtained
D
U
ESCRIPTIO
The LT
1620 simplifies the design of high performance,
controlled current battery charging circuits when used in
conjunction with a current mode PWM controller IC.
The LT1620 regulates average output current independent
of input and output voltage variations. Output current can
be easily adjusted via a programming voltage applied to
the LT1620’s PROG pin.
Most current mode PWM controllers have limited output
voltage range because of common mode limitations on the
current sense inputs. The LT1620 overcomes this restric-
tion by providing a level-shifted current sense signal,
allowing a 0V to 32V output voltage range.
The 16-pin version of the LT1620 contains a program-
mable low charging current flag output. This output flag
can be used to signal when a Li-Ion battery charging cycle
is nearing completion.
The LT1621 incorporates two fully independent current
control circuits for dual loop applications.
U
A
O
PPLICATI
TYPICAL
, LTC and LT are registered trademarks of Linear Technology Corporation.
BATTERY CHARGE CURRENT (A)
0
EFFICIENCY
(%)
90
95
100
4
1620/21 TA02
85
80
75
1
2
3
5
VIN = 24V
VBATT = 16V
VBATT = 12V
VBATT = 6V
Efficiency
Figure 1. Low Dropout, High Current Li-Ion Battery Charger
FB
ITH
LTC1435
SYNCHRONOUS
BUCK
REGULATOR
AVG
SENSE
LT1620MS8
VCC
GND
18
6
3
VBATT
IBATT TO 4A
VIN
(VBATT + 0.5V) TO 32V
LT1620/21 F01
IN–
IN+
IOUT
PROG
45
27
SIMPLIFIED SCHEMATIC. SEE FIGURE 2 FOR COMPLETE SCHEMATIC
0.1
F
15.75k
1%
3k
1%
0.1
F
SENSE–
INTVCC
VIN
SW
27
H
0.025
22
F
35V
× 2
1.43M
0.1%
110k
0.1%
22
F
35V
+
U
S
A
O
PPLICATI
s
High Current Battery Chargers
s
High Output Voltage DC/DC Converters
s
Constant Current Sources
s
Overcurrent Fault Protectors
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