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参数资料
| 型号： | LTC1980EGN |
| 厂商： | Linear Technology |
| 文件页数： | 11/16页 |
| 文件大小： | 0K |
| 描述： | IC PWM BATT CHARGER/CONV 24-SSOP |
| 标准包装： | 55 |
| 功能： | 充电管理 |
| 电池化学： | 锂离子，镍镉，镍氢 |
| 电源电压： | 2.85 V ~ 10 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 24-SSOP（0.154"，3.90mm 宽） |
| 供应商设备封装： | 24-SSOP |
| 包装： | 管件 |
LTC1980
OPERATIO
Transformer current is sensed across R S , gained up via U6
and sampled through switch SW1. The current in R7 is a
scaled-down replica of the battery charging current pulses
from the transformer. During battery charging, switch
SW2 is in the down position connecting R7, R8, R9 and C4
to the inverting input of amplifier U10 forming an integra-
tor which closes the outer loop of the converter and
establishes constant current charging. U12 is a g m ampli-
fier that clamps U10 as the battery float voltage is reached.
R10 and R11 set the float voltage and C5 compensates this
loop and provides a soft-start function.
APPLICATIO S I FOR ATIO
Setting Battery Charge Current
Referring to the simplified schematic in Figure 4, the
average current through R7 must equal the current through
R TRKL with switch SW3 open. This leads to the equation
for setting the trickle charge current:
DC/DC Converter Operation
When the LTC1980 is operating as a DC/DC converter, M1
turns on at the start of the oscillator cycle. When trans-
former current reaches a predetermined level set by U10’s
output voltage, M1 turns off and M2 turns on. SW2 is in the
up position forming an integrator with zero, which com-
pares the output voltage (via R1 and R2 to reference U11
establishing the output voltage.
where A V = 2.44 and V REF = 1.225V. The suggested value
for R7 is 10k.
Setting the Float Voltage
Pin selectable 4.1V, 4.2V, 8.2V, and 8.4V Li-Ion float
voltages are available. Other float voltages may be set via
R TRKL =
V REF ? R 7
I TRICKLE ? R S ? A V
external resistors. The following combinations of logic
inputs BATT1 and BATT2 determine the float voltage.
Normal charge current is set via the parallel combination
of R TRKL and R CHRG which leads to the following equation
for R CHRG
BATT2
0
0
1
BATT1
0
1
0
FLOAT VOLTAGE
4.1V
4.2V
8.2V
R CHRG =
V REF ? R 7
( I NORMAL – I TRICKLE ) ? R S ? A V
1 1 8.4V
Don’t Care Open Externally Set via OVP
where logic 0 = GND and logic 1 = V BIAS2 (Pin 19)
I SENSE
V REF
1.225V
+
V C
C4
I
R S
21
20
+
U6
A V = 2.44
–
SW1
22
CAOUT
R7
10k
R TRKL
R CHRG
2
PROGT
–
U10
4
GND
PROG
1
SW3
20
1980 F04
Figure 4. Battery Charger Current Control Loop
1980f
11
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| LTC1980EGN#PBF | 功能描述:IC PWM BATT CHARGER/CONV 24-SSOP 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) |
| LTC1980EGN#TR | 功能描述:IC PWM BATT CHARGER/CONV 24-SSOP 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) |
| LTC1980EGN#TRPBF | 功能描述:IC PWM BATT CHARGER/CONV 24-SSOP 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) |
| LTC1981ES5 | 制造商:Linear Technology 功能描述:MOSFET DRVR 1-OUT Hi Side 5-Pin TSOT-23 |
| LTC1981ES5#PBF | 制造商:Linear Technology 功能描述:MOSFET DRVR 1-OUT Hi Side 5-Pin TSOT-23 制造商:Linear Technology 功能描述:DP-Power Controller, CUT TAPE Single Micropower Hi Side Sw Controller 制造商:Linear Technology 功能描述:DRIVER, MOSFET, HIGH/LOW SIDE, SOT-23, Device Type:MOSFET, Module Configuration:High Side, Low Side, Supply Voltage Min:1.8V, Supply Voltage Max:5.5V, Driver Case Style:SOT-23, No. of Pins:5, Operating Temperature Min:-40C , RoHS Compliant: Yes |
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