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参数资料
| 型号： | LT3663HMS8E#TRPBF |
| 厂商： | LINEAR TECHNOLOGY CORP |
| 元件分类： | 稳压器 |
| 英文描述： | 2.5 A SWITCHING REGULATOR, 1650 kHz SWITCHING FREQ-MAX, PDSO8 |
| 封装： | LEAD FREE, PLASTIC, MSOP-8 |
| 文件页数： | 14/16页 |
| 文件大小： | 188K |
| 代理商： | LT3663HMS8E#TRPBF |
LT3663
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3663fb
OPERATION
The LT3663 is a constant frequency, current mode step
down regulator. A switch cycle is initiated when the os-
cillator enables the RS ip op, turning on the internal
power switch, Q1. The sense amplier (A1) monitors the
switch current via the voltage dropped across the current
sense resistor RSENSE1. The comparator compares the
amplied current signal with the output (VC) of the error
amplier (G1). The switch is turned off when this current
exceeds a value determined by the VC voltage. The error
amplier monitors the VOUT voltage through an internal
resistor divider and, when not driven externally, servos
the VC voltage to regulate VOUT. If the VOUT voltage drops,
the VC voltage will be driven higher increasing the output
current and VOUT voltage. An active clamp (not shown)
on the VC node provides current limit. The LT3663 is
internally compensated with a pole-zero combination on
the VC node.
An external capacitor and internal diode, D2, generate a
voltage at the BOOST pin that is higher than the input supply.
(Refer to Block Diagram)
This allows the driver to fully saturate the internal bipolar
NPN power switch for efcient operation. The switch driver
operates from either VIN 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 VIN 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
amplier G2. The voltage across sense resistor, RSENSE2,
is compared to a voltage programmed by external resistor
RILIM on the ILIM pin. A capacitor averages the inductor
ripple current. If the average inductor current exceeds the
programmed value then the VC 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.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LT3663IDCB#TRMPBF | 功能描述:IC REG BUCK ADJ 1.2A 8DFN 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:2,500 系列:- 类型:降压（降压） 输出类型:固定 输出数:1 输出电压:1.2V，1.5V，1.8V，2.5V 输入电压:2.7 V ~ 20 V PWM 型:- 频率 - 开关:- 电流 - 输出:50mA 同步整流器:是 工作温度:-40°C ~ 125°C 安装类型:表面贴装 封装/外壳:10-TFSOP，10-MSOP（0.118"，3.00mm 宽）裸露焊盘 包装:带卷 (TR) 供应商设备封装:10-MSOP 裸露焊盘 |
| LT3663IDCB#TRPBF | 功能描述:IC REG BUCK ADJ 1.2A 8DFN 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:2,500 系列:- 类型:降压（降压） 输出类型:固定 输出数:1 输出电压:1.2V，1.5V，1.8V，2.5V 输入电压:2.7 V ~ 20 V PWM 型:- 频率 - 开关:- 电流 - 输出:50mA 同步整流器:是 工作温度:-40°C ~ 125°C 安装类型:表面贴装 封装/外壳:10-TFSOP，10-MSOP（0.118"，3.00mm 宽）裸露焊盘 包装:带卷 (TR) 供应商设备封装:10-MSOP 裸露焊盘 |
| LT3663IDCB-5#TRMPBF | 制造商:Linear Technology 功能描述: |
| LT3663IDCB-5#TRPBF | 制造商:Linear Technology 功能描述:Conv DC-DC Single Step Down 7.5V to 36V 8-Pin DFN EP T/R |
| LT3663IMS8E#PBF | 功能描述:IC REG BUCK ADJ 1.2A 8MSOP 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 |
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