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参数资料
| 型号： | LT1769 |
| 厂商： | Linear Technology Corporation |
| 英文描述： | Constant-Current/ Constant-Voltage 2A Battery Charger with Input Current Limiting |
| 中文描述： | 恒流/恒压电池充电器，带甲输入限流 |
| 文件页数： | 8/16页 |
| 文件大小： | 214K |
| 代理商： | LT1769 |
8
LT1769
TEST CIRCUITS
Test Circuit 1
–
+
V
REF
≈
0.65V
V
BAT
V
C
CA2
–
+
–
+
CA1
+
300
20k
1k
1k
R
S1
100
BAT
SENSE
SPIN
1769 TC01
PROG
R
PROG
0.047
μ
F
LT1769
1
μ
F
60k
LT1006
+
R
S2
200
R
S3
200
Test Circuit 2
V
REF
2.465V
–
+
+
10k
10k
OVP
1769 TC02
I
PROG
R
PROG
LT1769
PROG
LT1013
0.47
μ
F
–
+
VA
OPERATIO
The LT1769 is a current mode PWM step-down (buck)
switcher. The battery DC charge current is programmed
by a resistor R
PROG
(or a DAC output current) at the PROG
pin (see Block Diagram). Amplifier CA1 converts the
charge current through R
S1
to a much lower current I
PROG
fed into the PROG pin. Amplifier CA2 compares the output
of CA1 with the programmed current and drives the PWM
control loop to force them to be equal. High DC accuracy
is achieved with averaging capacitor C
PROG
. Note that
I
PROG
has both AC and DC components. I
PROG
goes
through R1 and generates a ramp signal that is fed to the
PWM control comparator C1 through buffer B1 and level
U
shift resistors R2 and R3, forming the current mode inner
loop. The BOOST pin drives the switch NPN Q
SW
into
saturation and reduces power loss. For batteries like
lithium-ion that require both constant-current and con-
stant-voltage charging, the 0.5%, 2.465V reference and
the amplifier VA reduce the charge current when battery
voltage reaches the preset level. For NiMH and NiCd, VA
can be used for overvoltage protection. When the input
voltage is removed, the V
CC
pin drops to 0.7V below the
battery voltage, forcing the charger into a low battery drain
(3
μ
A typical) sleep mode. To shut down the charger,
simply pull the V
C
pin low with a transistor.
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PDF描述 |
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| LT1769CGN | Constant-Current/ Constant-Voltage 2A Battery Charger with Input Current Limiting |
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LT1769CFE | 功能描述:IC BATT CHRGR CNSTNT I/V 20TSSOP RoHS:否 类别:集成电路 (IC) >> PMIC - 电池管理 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:2,500 系列:- 功能:电池监控器 电池化学:碱性，锂离子，镍镉，镍金属氢化物 电源电压:1 V ~ 5.5 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:SOT-23-6 供应商设备封装:SOT-6 包装:带卷 (TR) |
| LT1769CFE#PBF | 功能描述:IC BATT CHRGR CNSTNT I/V 20TSSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 电池管理 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:2,500 系列:- 功能:电池监控器 电池化学:碱性，锂离子，镍镉，镍金属氢化物 电源电压:1 V ~ 5.5 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:SOT-23-6 供应商设备封装:SOT-6 包装:带卷 (TR) |
| LT1769CFE#TR | 功能描述:IC BATT CHRGR CNSTNT I/V 20TSSOP RoHS:否 类别:集成电路 (IC) >> PMIC - 电池管理 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:2,500 系列:- 功能:电池监控器 电池化学:碱性，锂离子，镍镉，镍金属氢化物 电源电压:1 V ~ 5.5 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:SOT-23-6 供应商设备封装:SOT-6 包装:带卷 (TR) |
| LT1769CFE#TRPBF | 功能描述:IC BATT CHRGR CNSTNT I/V 20TSSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 电池管理 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:2,500 系列:- 功能:电池监控器 电池化学:碱性，锂离子，镍镉，镍金属氢化物 电源电压:1 V ~ 5.5 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:SOT-23-6 供应商设备封装:SOT-6 包装:带卷 (TR) |
| LT1769CGN | 功能描述:IC BATT CHARGER CONST I/V 28SSOP RoHS:否 类别:集成电路 (IC) >> PMIC - 电池管理 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:2,500 系列:- 功能:电池监控器 电池化学:碱性，锂离子，镍镉，镍金属氢化物 电源电压:1 V ~ 5.5 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:SOT-23-6 供应商设备封装:SOT-6 包装:带卷 (TR) |
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