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参数资料
| 型号： | LTC1980EGN |
| 厂商： | Linear Technology |
| 文件页数： | 12/16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
APPLICATIO S I FOR ATIO
An external resistor divider (Figure 3) can be used to
program other float voltages. Resistor values are found
using the following equation:
R10 = R11 ? (V FLOAT – V REF )/V REF
where V REF = 1.225V. The suggested value for R11 is
100k. Use 1% or better resistors.
Setting DC/DC Converter Output Voltage
where V IH1 = 1.226V, suggested value for R7 is 100k. Use
1% resistors.
MODE Pin Operation
The following truth table describes MODE pin operation.
Burst Mode operation is disabled during battery charging
to reduce broadband noise inherent in Burst Mode opera-
tion. (Refer to the LT1307 data sheet for details).
From Figure 5, select the following resistors based on
output voltage V REG :
R8 = R14 ? (V REG – V REF )/V REF
where V REF = 1.225V, suggested value for R14 is 100k, 1%.
LDO Operation
POWER FLOW
Battery Charger
Battery Charger
Battery Charger
DC/DC converter
DC/DC converter
DC/DC converter
MODE PIN
0
Open
1
0
Open
1
OPERATING MODE
Disabled
Enabled Continuous
Enabled Continuous
Disabled
Enabled Burst Mode Operation
Enabled Continuous
The LTC1980 provides an uninterrupted power supply for
the system load. When a wall adapter is connected and
operating, power is taken from the wall adapter to charge
the batteries and supply power to the system. In applica-
tions where an unregulated wall adapter is used but a
regulated voltage is needed by the system, an external P-
channel MOSFET pass transistor may be added to the
LTC1980 to create a low dropout linear regulator.
From Figure 5, select the following resistors based on the
output voltage V LDO :
R5 = R6 ? (V LDO – V REF )/V REF
where V REF = 1.225V, suggested value for R6 is 100k, 1%.
This is the voltage that will be seen when operating from
a higher voltage wall adapter. When operating from the
batteries (as a regulator), the load will see either this
voltage or the voltage set by the PWM regulator, which-
ever is less, minus any drops in the pass transistor.
Placing a large-valued capacitor from the drain of this
MOSFET to ground creates output compensation.
Wall Adapter Comparator Threshold
From Figure 5, select the following resistors based on the
wall adapter comparator threshold V WATH :
R15 = R7(V WATH – V IH1 )/V IH1
Logic 1 = V BIAS1 (Pin 13) Logic 0 = GND
The MODE pin should be decoupled with 200pF to ground
when left open.
Snubber Design
The values given in the applications schematics have been
found to work quite well for most applications. Care
should be taken in selecting other values for your applica-
tion since efficiency may be impacted by a poor choice. For
a detailed look at snubber design, Application Note 19 is
very helpful.
Frequency Compensation
Load step testing can be used to empirically determine
compensation. Application Note 25 provides information
onthetechnique.ToadjustthecompensationfortheDC/
DC converter, adjust C12 and R13 (in Figure 5). Battery
charger current loop compensation is set by C11 and
battery charger float voltage compensation is set by C8.
Component Selection Basics
The application circuits work well for most 1- and 2-cell
Li-Ion, 0.5A to 1A output current designs. The next section
highlights the component selection process. More infor-
mation is available in Application Note 19.
1980f
12
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相关代理商/技术参数 |
参数描述 |
|---|---|
| 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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