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參數(shù)資料
| 型號(hào)： | LT3663IMS8E-5#PBF |
| 廠(chǎng)商： | LINEAR TECHNOLOGY CORP |
| 元件分類(lèi)： | 穩(wěn)壓器 |
| 英文描述： | 2.5 A SWITCHING REGULATOR, 1100 kHz SWITCHING FREQ-MAX, PDSO8 |
| 封裝： | LEAD FREE, PLASTIC, MSOP-8 |
| 文件頁(yè)數(shù)： | 14/16頁(yè) |
| 文件大?。?/td> | 188K |
| 代理商： | LT3663IMS8E-5#PBF |
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LT3663
7
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.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| LT3663EMS8E-3.3#TRPBF | 2.5 A SWITCHING REGULATOR, 1100 kHz SWITCHING FREQ-MAX, PDSO8 |
| LT3663HMS8E-5#PBF | 2.5 A SWITCHING REGULATOR, 1100 kHz SWITCHING FREQ-MAX, PDSO8 |
| LT3663IMS8E-3.3#TRPBF | 2.5 A SWITCHING REGULATOR, 1100 kHz SWITCHING FREQ-MAX, PDSO8 |
| LT3663IDCB-3.3#TRPBF | 2.5 A SWITCHING REGULATOR, 1100 kHz SWITCHING FREQ-MAX, PDSO8 |
| LT3663HMS8E#PBF | 2.5 A SWITCHING REGULATOR, 1650 kHz SWITCHING FREQ-MAX, PDSO8 |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LT3680 | 制造商:LINER 制造商全稱(chēng):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 類(lèi)別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 開(kāi)關(guān)穩(wěn)壓器 系列:- 標(biāo)準(zhǔn)包裝:250 系列:- 類(lèi)型:降壓（降壓） 輸出類(lèi)型:固定 輸出數(shù):1 輸出電壓:1.2V 輸入電壓:2.05 V ~ 6 V PWM 型:電壓模式 頻率 - 開(kāi)關(guān):2MHz 電流 - 輸出:500mA 同步整流器:是 工作溫度:-40°C ~ 85°C 安裝類(lèi)型:表面貼裝 封裝/外殼:6-UFDFN 包裝:帶卷 (TR) 供應(yīng)商設(shè)備封裝:6-SON（1.45x1） 產(chǎn)品目錄頁(yè)面:1032 (CN2011-ZH PDF) 其它名稱(chēng):296-25628-2 |
| LT3680EDD#TRPBF | 功能描述:IC REG BUCK ADJ 3.5A 10DFN RoHS:是 類(lèi)別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 開(kāi)關(guān)穩(wěn)壓器 系列:- 設(shè)計(jì)資源:Design Support Tool 標(biāo)準(zhǔn)包裝:1 系列:- 類(lèi)型:升壓（升壓） 輸出類(lèi)型:固定 輸出數(shù):1 輸出電壓:3V 輸入電壓:0.75 V ~ 2 V PWM 型:- 頻率 - 開(kāi)關(guān):- 電流 - 輸出:100mA 同步整流器:是 工作溫度:-40°C ~ 85°C 安裝類(lèi)型:表面貼裝 封裝/外殼:SOT-23-5 細(xì)型，TSOT-23-5 包裝:剪切帶 (CT) 供應(yīng)商設(shè)備封裝:TSOT-23-5 其它名稱(chēng):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 制造商全稱(chēng):Linear Technology 功能描述:36V, 3.5A, 2.4MHz Step-Down Switching Regulator with 75μA Quiescent Current |
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