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| 型号： | LT1579CGN-3.3 |
| 厂商： | Linear Technology |
| 文件页数： | 15/20页 |
| 文件大小： | 0K |
| 描述： | IC LDO REG SMART DUAL3.3V 16SSOP |
| 标准包装： | 100 |
| 功能： | 备份管理 |
| 电池化学： | 智能电池 |
| 工作温度： | 0°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 16-SSOP（0.154"，3.90mm 宽） |
| 供应商设备封装： | 16-SSOP |
| 包装： | 管件 |
| 产品目录页面： | 1328 (CN2011-ZH PDF) |
LT1579
APPLICATIO N S I N FOR M ATIO N
Example: The low-battery detector must be tripped at a
terminal voltage of 5.5V. There is a 100k pull-up resistor
to 5V on the output of the comparator and 200mV of
hysteresis is needed to prevent chatter. With a 1M resistor
for R1, what other resistor values are needed?
Using the formulas in Figure 3,
R 2 = ( 5. 5V – 1 .5V )( 1M ? ) = 2 . 67 M ?
1 . 5 V
Use a standard value of 2.7M ? . With the 100k pull-up
resistor, this gives a sink current and logic flag voltage of
approximately 45 μ A at 0.4V. The hysteresis in this case
will be:
current supplied to the load from each input. Normal
output deviation during transient load conditions (with
sufficient input voltages) will not set the status flags.
Timing Diagram
The timing diagram for the 5V dual battery supply is shown
in Figure 4. The schematic is the same as the 5V Dual
Battery Supply on the front of the data sheet. All logic flag
outputs have 100k pull-up resistors added. Note that there
is no time scale for the timing diagram. The timing diagram
is meant as a tool to help in understanding basic operation
of the LT1579. Actual discharge rates will be a function of
the load current and the type of batteries used. The load
current used in the example was 100mA DC.
Hysteresis = 18 mV ? 1 +
? = 67 mV
?
?
2 . 7 M ? ?
1 M ? ?
6V
V IN1
A
B
C
D
E
An additional 133mV of hysteresis is needed, so a resistor
and diode must be added. The value of R3 will be:
5V
R 3 =
( 1. 5V + 18mV – 0. 6V – 0. 4V )( 2. 7M ? ) = 10 . 5 M ?
133 mV
6V
V IN2
A standard value of 10M ? can be used. The additional
current flowing through R3 into the comparator output is
negligible and can usually be ignored
Logic Flags
The low-battery comparator outputs and the status flags
of the LT1579 are open collector outputs capable of
sinking up to 5mA. See the curve of Logic Flag Output
Voltage vs. Current in the Typical Performance Character-
istics.
5V
V OUT 5V
4.8V
100mA
I IN1
0
100mA
I IN2
0
There are two status flags on the LT1579. The BACKUP
flag and the DROPOUT flag provide information on which
input is supplying power to the load and give early warning
of loss of output regulation. The BACKUP flag goes low
when the secondary input begins supplying power to the
LB01
BACKUP
LB02
1
0
1
0
1
load. The DROPOUT flag signals the dropout condition on
both inputs, warning of an impending drop in output
voltage. The conditions that set either status flag are
determined by input to output voltage differentials and
DROPOUT
0
1
0
Figure 4. Basic Dual Battery Timing Diagram
LTC1579 ? F03
15
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相关代理商/技术参数 |
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| LT1579CGN-5 | 功能描述:IC LDO REG SMART DUAL 5V 16SSOP RoHS:否 类别:集成电路 (IC) >> PMIC - 电池管理 系列:- 标准包装:2,000 系列:Impedance Track™ 功能:燃料，电量检测计/监控器 电池化学:锂离子（Li-Ion） 电源电压:2.4 V ~ 2.6 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:20-TSSOP（0.173"，4.40mm 宽） 供应商设备封装:20-TSSOP 包装:带卷 (TR) 产品目录页面:1020 (CN2011-ZH PDF) 配用:BQ27350EVM-ND - BQ27350EVM 其它名称:296-21665-2 |
| LT1579CGN-5#PBF | 功能描述:IC LDO REG SMART DUAL 5V 16SSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 电池管理 系列:- 标准包装:2,000 系列:Impedance Track™ 功能:燃料，电量检测计/监控器 电池化学:锂离子（Li-Ion） 电源电压:2.4 V ~ 2.6 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:20-TSSOP（0.173"，4.40mm 宽） 供应商设备封装:20-TSSOP 包装:带卷 (TR) 产品目录页面:1020 (CN2011-ZH PDF) 配用:BQ27350EVM-ND - BQ27350EVM 其它名称:296-21665-2 |
| LT1579CGN-5#TR | 功能描述:IC REG LDO SMART DUAL 5V 16SSOP 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) |
| LT1579CGN-5#TRPBF | 功能描述:IC LDO REG SMART DUAL 5V 16SSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 电池管理 系列:- 标准包装:1 系列:- 功能:充电管理 电池化学:锂离子（Li-Ion）、锂聚合物（Li-Pol） 电源电压:3.75 V ~ 6 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:SC-74A，SOT-753 供应商设备封装:SOT-23-5 包装:剪切带 (CT) 产品目录页面:669 (CN2011-ZH PDF) 其它名称:MCP73831T-2ACI/OTCT |
| LT1579CS | 功能描述:IC LDO REG SMART DUAL ADJ 16SOIC 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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