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參數(shù)資料
| 型號(hào)： | LT3682EDD#TRPBF |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | SWITCHING REGULATOR, PDSO12 |
| 封裝： | 3 X 3 MM, LEAD FREE, PLASTIC, DFN-12 |
| 文件頁數(shù)： | 2/24頁 |
| 文件大小： | 253K |
| 代理商： | LT3682EDD#TRPBF |
LT3682
10
3682f
OPERATION
The LT3682 is a constant frequency, current mode
step-down regulator. An oscillator, with frequency set by
RT, enables an RS ip-op, turning on the internal power
switch. An amplier and comparator monitor the current
owing between the VIN and SW pins, turning the switch
off when this current reaches a level determined by the
voltage at VC. An error amplier measures the output
voltage through an external resistor divider tied to the FB
pin and servos the VC pin. If the error amplier’s output
increases, more current is delivered to the output; if it
decreases, less current is delivered. An active clamp on the
VC pin provides current limit. The VC pin is also clamped to
the voltage on the RUN/SS pin; soft-start is implemented
by generating a voltage ramp at the RUN/SS pin using an
external resistor and capacitor.
An internal regulator provides power to the control circuitry.
The bias regulator normally draws power from the VIN pin,
but if the BD pin is connected to an external voltage higher
than 3V, bias power will be drawn from the external source
(typically the regulated output voltage). This improves
efciency. The RUN/SS pin is used to place the LT3682
in shutdown, disconnecting the output and reducing the
input current to less than 1μA.
The switch driver operates from either the input or from
the BOOST pin. An external capacitor and the internal boost
diode are used to 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
efcient operation.
To further optimize efciency, the LT3682 automatically
switches to Burst Mode operation in light load situations.
Between bursts, all circuitry associated with controlling
the output switch is shut down, reducing the input supply
current to 75μA in a typical application.
The oscillator reduces the LT3682’s operating frequency
when the voltage at the FB pin is low. This frequency
foldback helps to control the output current during startup
and overload conditions.
Internal circuitry monitors the current owing through the
catch diode via the DA pin and delays the generation of
new switch pulses if this current is too high (above 1.6A
nominal). This mechanism also protects the part during
short-circuit and overload conditions by keeping the cur-
rent through the inductor under control.
The LT3682 contains a power good comparator which trips
when the FB pin is at 90% of its regulated value. The PG
output is an open-collector transistor that is off when the
output is in regulation, allowing an external resistor to pull
the PG pin high. Power good is valid when the LT3682 is
enabled and VIN is above the minimum input voltage.
The LT3682 has an overvoltage protection feature which
disables switching action when the VIN goes above 39V
typical (36V minimum) during transients. When switching
is disabled, the LT3682 can safely sustain transient input
voltages up to 60V.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LT3682IDD#PBF | 功能描述:IC REG BUCK ADJ 1A 12DFN RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 開關(guān)穩(wěn)壓器 系列:- 產(chǎn)品培訓(xùn)模塊:MIC23xxx HyperLight Load™ Regulators 標(biāo)準(zhǔn)包裝:5,000 系列:HyperLight Load® 類型:降壓（降壓） 輸出類型:固定 輸出數(shù):1 輸出電壓:1.8V 輸入電壓:2.7 V ~ 5.5 V PWM 型:混合物 頻率 - 開關(guān):4MHz 電流 - 輸出:2A 同步整流器:是 工作溫度:-40°C ~ 125°C 安裝類型:表面貼裝 封裝/外殼:8-VFDFN 裸露焊盤，8-MLF? 包裝:帶卷 (TR) 供應(yīng)商設(shè)備封裝:8-MLF?（2x2） 產(chǎn)品目錄頁面:1094 (CN2011-ZH PDF) 其它名稱:576-3303-2 |
| LT3682IDD#PBF | 制造商:Linear Technology 功能描述:DC-DC CONVERTER BUCK 2.2MHZ 制造商:Linear Technology 功能描述:DC-DC CONVERTER, BUCK, 2.2MHZ, DFN-12 |
| LT3682IDD#TRPBF | 功能描述:IC REG BUCK ADJ 1A 12DFN RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 開關(guān)穩(wěn)壓器 系列:- 標(biāo)準(zhǔn)包裝:2,500 系列:- 類型:降壓（降壓） 輸出類型:固定 輸出數(shù):1 輸出電壓:1.2V，1.5V，1.8V，2.5V 輸入電壓:2.7 V ~ 20 V PWM 型:- 頻率 - 開關(guān):- 電流 - 輸出:50mA 同步整流器:是 工作溫度:-40°C ~ 125°C 安裝類型:表面貼裝 封裝/外殼:10-TFSOP，10-MSOP（0.118"，3.00mm 寬）裸露焊盤 包裝:帶卷 (TR) 供應(yīng)商設(shè)備封裝:10-MSOP 裸露焊盤 |
| LT3682IDD-PBF | 制造商:LINER 制造商全稱:Linear Technology 功能描述:1A Micropower Step-Down |
| LT3682IDD-TRPBF | 制造商:LINER 制造商全稱:Linear Technology 功能描述:1A Micropower Step-Down |
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