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参数资料
| 型号： | LT1054IP |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 稳压器 |
| 英文描述： | SWITCHED CAPACITOR REGULATOR, 35 kHz SWITCHING FREQ-MAX, PDIP8 |
| 封装： | ROHS COMPLIANT, PLASTIC, DIP-8 |
| 文件页数： | 3/30页 |
| 文件大小： | 607K |
| 代理商： | LT1054IP |
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LT1054
SWITCHED-CAPACITOR VOLTAGE CONVERTERS
WITH REGULATORS
SLVS033F FEBRUARY 1990 REVISED NOVEMBER 2004
11
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
APPLICATION INFORMATION
regulation
The feedback/shutdown (FB/SD) terminal has two functions. Pulling FB/SD below the shutdown threshold
(
≈ 0.45 V) puts the device into shutdown. In shutdown, the reference/regulator is turned off and switching stops.
The switches are set such that both CIN and COUT are discharged through the output load. Quiescent current
in shutdown drops to approximately 100
μA. Any open-collector gate can be used to put the LT1054 into
shutdown. For normal (unregulated) operation, the device will restart when the external gate is shut off. In
LT1054 circuits that use the regulation feature, the external resistor divider can provide enough pulldown to keep
the device in shutdown until the output capacitor (COUT) has fully discharged. For most applications, where the
LT1054 is run intermittently, this does not present a problem because the discharge time of the output capacitor
is short compared to the off time of the device. In applications where the device has to start up before the output
capacitor (COUT) has fully discharged, a restart pulse must be applied to FB/SD of the LT1054. Using the circuit
shown in Figure 16, the restart signal can be either a pulse (tp > 100 μs) or a logic high. Diode coupling the restart
signal into FB/SD allows the output voltage to rise and regulate without overshoot. The resistor divider R3/R4
shown in Figure 16 should be chosen to provide a signal level at FB/SD of 0.71.1 V.
FB/SD also is the inverting input of the LT1054 error amplifier and, as such, can be used to obtain a regulated
output voltage.
VIN
R2
R1
R4
R3
Restart
Shutdown
C1
5
6
7
8
+
CIN
10-
μF
Tantalum
4
3
2
1
LT1054
VOUT
VREF
OSC
VCC
CAP
GND
CAP+
FB/SD
VOUT
Where: R1 = 20 k
Ω
VREF = 2.5 V Nominal
+
2.2
μF
For example: To get VO = 5 V, referenced to the ground terminal of the LT1054
Choose the closest 1% value.
Pin numbers shown are for the P package.
COUT
100-
μF
Tantalum
R2
+ R1
V
OUT
V
REF
2
* 40 mV
) 1
+ 20 kW
|–5 V|
2.5 V
2
* 40 mV
) 1
+ 102.6 kW
+
Figure 16. Basic Regulation Configuration
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LT1054IP | 制造商:Texas Instruments 功能描述:Voltage Regulator IC Package/Case:8-PDIP |
| LT1054IPE4 | 功能描述:电荷泵 Switched-Capacitor Voltage Converter RoHS:否 制造商:Maxim Integrated 功能:Inverting, Step Up 输出电压:- 1.5 V to - 5.5 V, 3 V to 11 V 输出电流:100 mA 电源电流:1 mA 最大工作温度:+ 70 C 封装 / 箱体:SOIC-8 Narrow 封装:Tube |
| LT1054IS8 | 功能描述:IC REG SWITCHD CAP DBL INV 8SOIC RoHS:否 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 设计资源:Design Support Tool 标准包装:1 系列:- 类型:升压（升压） 输出类型:固定 输出数:1 输出电压:3V 输入电压:0.75 V ~ 2 V PWM 型:- 频率 - 开关:- 电流 - 输出:100mA 同步整流器:是 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:SOT-23-5 细型，TSOT-23-5 包装:剪切带 (CT) 供应商设备封装:TSOT-23-5 其它名称:AS1323-BTTT-30CT |
| LT1054IS8#PBF | 功能描述:IC REG SWITCHD CAP DBL INV 8SOIC RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 标准包装:250 系列:- 类型:降压（降压） 输出类型:固定 输出数:1 输出电压:1.2V 输入电压:2.05 V ~ 6 V PWM 型:电压模式 频率 - 开关:2MHz 电流 - 输出:500mA 同步整流器:是 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:6-UFDFN 包装:带卷 (TR) 供应商设备封装:6-SON（1.45x1） 产品目录页面:1032 (CN2011-ZH PDF) 其它名称:296-25628-2 |
| LT1054IS8#PBF | 制造商:Linear Technology 功能描述:DC/DC Converter IC |
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