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| 型号： | LT1579CGN |
| 厂商： | Linear Technology |
| 文件页数： | 13/20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
(
)
? – 2 mV = – 16 mV
? 1 . 5 V ?
A small capacitor placed in parallel with the top resistor
(R2) of the output divider is necessary for stability and
transient performance of the adjustable LT1579. The
impedance of C FB at 10kHz should be less than the value
of R1.
The adjustable LT1579 is tested and specified with the
output pin tied to the adjust pin and a 3 μ A load (unless
otherwise noted) for an output voltage of 1.5V. Specifica-
tions for output voltages greater than 1.5V are propor-
tional to the ratio of the desired output voltage to 1.5V;
(V OUT /1.5V). For example, load regulation for an output
current change of 1mA to 300mA is – 2mV typical at
V OUT = 1.5V. At V OUT = 12V, load regulation is:
? 12 V ?
?
Output Capacitance and Transient Response
The LT1579 is designed to be stable with a wide range of
output capacitors. The ESR of the output capacitor affects
stability, most notably with small capacitors. A minimum
output capacitor of 4.7 μ F with an ESR of 3 ? or less is
recommended to prevent oscillations. Smaller value ca-
pacitors may be used, but capacitors which have a low
ESR (i.e. ceramics) may need a small series resistor added
to bring the ESR into the range suggested in Table 1. The
LT1579 is a micropower device and output transient
response is a function of output capacitance. Larger
values of output capacitance decrease the peak deviations
and provide improved output transient response for larger
load current changes. Bypass capacitors, used to decouple
individual components powered by the LT1579, will
increase the effective output capacitor value.
Table 1. Suggested ESR Range
BIASCOMP Pin Compensation
The BIASCOMP pin is a connection to a compensation
point for the internal bias circuitry. It must be bypassed
with a 0.01 μ F capacitor for stability during the switch from
V IN1 to V IN2 .
“Hot” Plugging and Unplugging of Inputs
The LT1579 is designed to maintain regulation even if one
of the outputs is instantaneously removed. If the primary
input is supplying load current, removal and insertion of
the secondary input creates no noticeable transient at the
output. In this case, the LT1579 continues to supply
current from the primary; no switching is required. How-
ever, when load current is being supplied from the primary
input and it is removed, load current must be switched
from the primary to the secondary input. In this case, the
LT1579 sees the input capacitor as a rapidly discharging
battery. If it discharges too quickly, the LT1579 does not
have ample time to switch over without a large transient
occurring at the output. The input capacitor must be large
enough to supply load current during the transition from
primary to secondary input. Replacement of the primary
creates a smaller transient on the output because both
inputs are present during the transition. For a 100mA load,
input and output capacitors of 10 μ F will limit peak output
deviations to less than 50mV. See the “Hot” Plugging and
Unplugging Transient Response in the Typical Perfor-
mance Characteristics. Proportionally larger values for
input and output capacitors are needed to limit peak
deviations on the output when delivering larger load
currents.
Standby Mode
“Standby” mode is where one input draws a minimum
quiescent current when the other input is delivering all
OUTPUT CAPACITANCE
1.5 μ F
2.2 μ F
3.3 μ F
≥ 4.7 μ F
SUGGESTED ESR RANGE
1 ? to 3 ?
0.5 ? to 3 ?
0.2 ? to 3 ?
0 ? to 3 ?
bias and load currents . In this mode, the standby current
is the quiescent current drawn from the standby input. The
secondary input will be in standby mode, when the pri-
mary input is delivering all load and bias currents. When
the secondary input is in standby mode the current drawn
from the secondary input will be 3 μ A if V IN1 > V IN2 and 5 μ A
13
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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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