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参数资料
| 型号： | LT3663IMS8E-5#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 7/16页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK 5V 1.2A 8MSOP |
| 标准包装： | 50 |
| 类型： | 降压（降压） |
| 输出类型： | 固定 |
| 输出数： | 1 |
| 输出电压： | 5V |
| 输入电压： | 7.5 V ~ 36 V |
| PWM 型： | 电流模式 |
| 频率 - 开关： | 1MHz |
| 电流 - 输出： | 1.2A |
| 同步整流器： | 无 |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-TSSOP，8-MSOP（0.118"，3.00mm 宽）裸露焊盘 |
| 包装： | 管件 |
| 供应商设备封装： | 8-MSOP-EP |
| 产品目录页面： | 1332 (CN2011-ZH PDF) |
LT3663
OPERATION
(Refer to Block Diagram)
The LT3663 is a constant frequency, current mode step
down regulator. A switch cycle is initiated when the os-
cillator enables the RS flip flop, turning on the internal
power switch, Q1. The sense amplifier (A1) monitors the
switch current via the voltage dropped across the current
sense resistor R SENSE1 . The comparator compares the
amplified current signal with the output (V C ) of the error
amplifier (G1). The switch is turned off when this current
exceeds a value determined by the V C voltage. The error
amplifier monitors the V OUT voltage through an internal
resistor divider and, when not driven externally, servos
the V C voltage to regulate V OUT . If the V OUT voltage drops,
the V C voltage will be driven higher increasing the output
current and V OUT voltage. An active clamp (not shown)
on the V C node provides current limit. The LT3663 is
internally compensated with a pole-zero combination on
the V C node.
An external capacitor and internal diode, D2, generate a
voltage at the BOOST pin that is higher than the input supply.
This allows the driver to fully saturate the internal bipolar
NPN power switch for efficient operation. The switch driver
operates from either V IN or BOOST to ensure startup.
An internal regulator provides power to the control circuitry.
This regulator includes input undervoltage and overvoltage
protection which disables switching action when V IN is
out of range. When switching is disabled, the LT3663
safely sustains input voltages up to 60V. Note that while
switching is disabled the output will discharge.
Output current limiting is provided via the servo action of
amplifier G2. The voltage across sense resistor, R SENSE2 ,
is compared to a voltage programmed by external resistor
R ILIM on the I LIM pin. A capacitor averages the inductor
ripple current. If the average inductor current exceeds the
programmed value then the V C voltage is pulled low, reduc-
ing the current in the regulator. The output current limit
circuit allows for a lower current rated inductor and diode
and provides better control of system power dissipation.
7
For more information For more information www.linear.com/LT3663
3663fc
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相关代理商/技术参数 |
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|---|---|
| LT3680 | 制造商:LINER 制造商全称:Linear Technology 功能描述:36V, 3.5A, 2.4MHz Step-Down Switching Regulator with 75μA Quiescent Current |
| LT3680EDD#PBF | 功能描述:IC REG BUCK ADJ 3.5A 10DFN 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 |
| LT3680EDD#TRPBF | 功能描述:IC REG BUCK ADJ 3.5A 10DFN RoHS:是 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 |
| LT3680EDDPBF | 制造商:Linear Technology 功能描述:DC-DC Converter Step-Down 3.6-36V DFN10 |
| LT3680EDD-PBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:36V, 3.5A, 2.4MHz Step-Down Switching Regulator with 75μA Quiescent Current |
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