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參數(shù)資料
| 型號： | LTC1734 |
| 廠商： | Linear Technology Corporation |
| 英文描述： | Lithium-Ion Linear Battery Charger in SOT-23(鋰離子線性電池充電器（SOT-23封裝）) |
| 中文描述： | 鋰離子線性電池充電器采用SOT - 23（鋰離子線性電池充電器（采用SOT - 23封裝）） |
| 文件頁數(shù)： | 4/8頁 |
| 文件大?。?/td> | 140K |
| 代理商： | LTC1734 |
4
LTC1734
BLOCK DIAGRA
OPERATIOU
The LTC1734 is a linear battery charger controller. Op-
eration can best be understood by referring to the Block
Diagram. Charging begins when V
CC
rises above the
UVLO (Undervoltage Lockout) threshold V
UVLOI
and an
external current programming resistor is connected be-
tween the PROG pin and ground. When charging, the
collector of the external PNP provides the charge current.
The PNP’s emitter current flows through the I
SENSE
pin
and through the internal 0.06
current sense resistor.
This current is close in magnitude, but slightly more than
the collector current since it includes the base current.
Amplifier A3, along with the P-channel FET, will force the
same voltage that appears across the 0.06
resistor to
appear across the internal 60
resistor. The scale factor
of 1000:1 in resistor values will cause the FET’s drain
current to be 1/1000 of the charge current and it is this
current that flows through the PROG pin. In the constant
current mode, amplifier A2 is used to limit the charge
current to the maximum that is programmed by R
PROG
.
The PROG pin current, which is 1/1000 of the charge
current, develops a voltage across the program resistor.
When this voltage reaches 1.5V, amplifier A1 begins
–
+
–
+
–
+
2
5
UVLO
VOLTAGE
REFERENCE
SHUTDOWN
SHUTDOWN
SHUTDOWN
SHUTDOWN
GND
1734 BD
4
PROG
R
PROG
2.5V
10
μ
F
A1
A2
A3
1.5V
–
+
C1
2.15V
3
μ
A
BAT
I
BAT
SINGLE
Li-Ion
CELL
6
DRIVE
1
I
SENSE
V
CC
1
μ
F
V
IN
I
BAT
/1000
TEMPERATURE AND
CURRENT LIMITING
60
0.06
3
OUTPUT
DRIVER
I
BAT
diverting current away from the output driver, thus limit-
ing the charge current. This is the constant current mode.
The constant charge current is 1000 (1.5V/R
PROG
).
As the battery accepts charge, its voltage rises. When it
reaches the preset float voltage of 4.2V (LTC1734-4.2
version), a precisely divided down version of this voltage
(2.5V) is compared to the 2.5V internal reference voltage
by amplifier A1. If the battery voltage attempts to exceed
4.2V (2.5V at amplifier A1’s input) the amplifier will divert
current away from the output driver thus limiting charge
current to that which will maintain 4.2V on the battery. This
is the constant voltage mode.
When in the constant voltage mode, the 1000:1 current
ratio still holds and the voltage on the PROG pin will indi-
cate the charge current as a proportion of the maximum
current set by the current programming resistor. The bat-
tery charge current is 1000 (V
PROG
/R
PROG
) amps. This
feature allows a microcontroller with an ADC to easily
monitor charging current and if desired, manually shut
down the charger at the appropriate time.
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| LTC1734ES6-4.1#TR | 功能描述:IC BATT CHRGR LI-ION LIN SOT23-6 RoHS:否 類別:集成電路 (IC) >> PMIC - 電池管理 系列:- 標準包裝:61 系列:- 功能:電源管理 電池化學:鋰離子（Li-Ion）、鋰聚合物（Li-Pol） 電源電壓:4.35 V ~ 5.5 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:22-WFDFN 裸露焊盤 供應商設備封裝:22-DFN（6x3）裸露焊盤 包裝:管件 |
| LTC1734ES6-4.1#TRM | 功能描述:IC BATT CHRGR LI-ION LIN SOT23-6 RoHS:否 類別:集成電路 (IC) >> PMIC - 電池管理 系列:- 標準包裝:61 系列:- 功能:電源管理 電池化學:鋰離子（Li-Ion）、鋰聚合物（Li-Pol） 電源電壓:4.35 V ~ 5.5 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:22-WFDFN 裸露焊盤 供應商設備封裝:22-DFN（6x3）裸露焊盤 包裝:管件 |
| LTC1734ES6-4.1#TRMPBF | 功能描述:IC BATT CHRGR LI-ION LIN SOT23-6 RoHS:是 類別:集成電路 (IC) >> PMIC - 電池管理 系列:- 標準包裝:61 系列:- 功能:電源管理 電池化學:鋰離子（Li-Ion）、鋰聚合物（Li-Pol） 電源電壓:4.35 V ~ 5.5 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:22-WFDFN 裸露焊盤 供應商設備封裝:22-DFN（6x3）裸露焊盤 包裝:管件 |
| LTC1734ES6-4.1#TRPBF | 功能描述:IC BATT CHRGR LI-ION LIN SOT23-6 RoHS:是 類別:集成電路 (IC) >> PMIC - 電池管理 系列:- 標準包裝:61 系列:- 功能:電源管理 電池化學:鋰離子（Li-Ion）、鋰聚合物（Li-Pol） 電源電壓:4.35 V ~ 5.5 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:22-WFDFN 裸露焊盤 供應商設備封裝:22-DFN（6x3）裸露焊盤 包裝:管件 |
| LTC1734ES6-4.2 | 制造商:Linear Technology 功能描述:Battery Charger Li-Ion/NiCD/NiMH 200mA to 700mA 4.2V 6-Pin TSOT-23 制造商:Linear Technology 功能描述:0.9 A BATTERY CHARGE CONTROLLER, PDSO6 |
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