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| 型号： | LT1579CGN |
| 厂商： | Linear Technology |
| 文件页数： | 17/20页 |
| 文件大小： | 0K |
| 描述： | IC LDO REG SMART DUAL ADJ 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
resistance from the junction to a ground lead is 40 ° C/W for
16-lead SSOP, 32 ° C/W for 16-lead SO and 35 ° C/W for
8-lead S0.
Table 2. 8-Lead SO Package (S8)
Therefore,
P = (150mA)(7V – 5V) + (2mA)(7V) = 0.31W
When switched to the secondary input, current from the
primary input is negligible and worst-case power dissipa-
COPPER AREA
TOPSIDE* BACKSIDE
2500 sq mm 2500 sq mm
1000 sq mm 2500 sq mm
225 sq mm 2500 sq mm
100 sq mm 2500 sq mm
*Device is mounted on topside.
THERMAL RESISTANCE
BOARD AREA (JUNCTION-TO-AMBIENT)
2500 sq mm 73 ° C/W
2500 sq mm 75 ° C/W
2500 sq mm 80 ° C/W
2500 sq mm 90 ° C/W
tion will be:
(I OUT(MAX) )(V IN2(MAX) – V OUT ) + (I GND )(V IN2(MAX) )
Where:
I OUT(MAX) = 150mA
V IN2(MAX) = 10V
I GND at (I OUT = 150mA, V IN2 = 10V) = 2mA
Table 3. 16-Lead SO Package (S)
Therefore,
COPPER AREA
TOPSIDE* BACKSIDE
2500 sq mm 2500 sq mm
1000 sq mm 2500 sq mm
225 sq mm 2500 sq mm
100 sq mm 2500 sq mm
*Device is mounted on topside.
THERMAL RESISTANCE
BOARD AREA (JUNCTION-TO-AMBIENT)
2500 sq mm 55 ° C/W
2500 sq mm 58 ° C/W
2500 sq mm 60 ° C/W
2500 sq mm 68 ° C/W
P = (150mA)(10V – 5V) + (2mA)(10V) = 0.77W
Using a 16-lead SO package, the thermal resistance will be
in the range of 55 ° C/W to 68 ° C/W dependent upon the
copper area. So the junction temperature rise above
ambient will be approximately equal to:
(0.77W)(65 ° C/W) = 50.1 ° C
Table 4. 16-Lead SSOP Package (GN)
The maximum junction temperature will then be equal to
COPPER AREA
THERMAL RESISTANCE
the maximum temperature rise above ambient plus the
TOPSIDE*
BACKSIDE
BOARD AREA (JUNCTION-TO-AMBIENT)
maximum ambient temperature or:
2500 sq mm 2500 sq mm
1000 sq mm 2500 sq mm
225 sq mm 2500 sq mm
100 sq mm 2500 sq mm
*Device is mounted on topside.
2500 sq mm
2500 sq mm
2500 sq mm
2500 sq mm
70 ° C/W
75 ° C/W
80 ° C/W
95 ° C/W
T JMAX = 50.1 ° C + 50 ° C = 100.1 ° C
Protection Features
The LT1579 incorporates several protection features that
make it ideal for use in battery-powered circuits. In addi-
Calculating Junction Temperature
Example: Given an output voltage of 5V, an input voltage
range of 5V to 7V for V IN1 and 8V to 10V for V IN2 , with an
output current range of 10mA to 150mA and a maximum
ambient temperature of 50 ° C, what will the maximum
junction temperature be?
When run from the primary input, current drawn from the
secondary input is negligible and worst-case power dissi-
pation will be:
(I OUT(MAX) )(V IN1(MAX) – V OUT ) + (I GND )(V IN1(MAX) )
Where:
I OUT(MAX) = 150mA
V IN1(MAX) = 7V
I GND at (I OUT = 150mA, V IN1 = 7V) = 2mA
tion to the normal protection features associated with
monolithic regulators, such as current limiting and ther-
mal limiting, the device is protected against reverse input
voltages, reverse output voltages and reverse voltages
from output to input.
Current limit protection and thermal overload protection
are intended to protect the device against current overload
conditions at the output of the device. For normal opera-
tion, the junction temperature should not exceed 125 ° C.
Current limit protection is designed to protect the device
if the output is shorted to ground. With the output shorted
to ground, current will be drawn from the primary input
until it is discharged. The current drawn from V IN2 will not
increase until the primary input is discharged. This pre-
vents a short-circuit on the output from discharging both
inputs simultaneously.
17
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相关代理商/技术参数 |
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| LT1579CGN#PBF | 功能描述:IC LDO REG SMART DUAL ADJ 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#TR | 功能描述:IC REG LDO SMART DUAL ADJ 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#TRPBF | 功能描述:IC LDO REG SMART DUAL ADJ 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 |
| LT1579CGN-3 | 功能描述:IC LDO REG SMART DUAL 3V 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-3#PBF | 功能描述:IC LDO REG SMART DUAL 3V 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 |
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