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參數(shù)資料
| 型號(hào)： | LT3686AIMSE#TRPBF |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 2.65 A SWITCHING REGULATOR, 2500 kHz SWITCHING FREQ-MAX, PDSO12 |
| 封裝： | LEAD FREE, PLASTIC, MSOP-12 |
| 文件頁數(shù)： | 30/30頁 |
| 文件大小： | 504K |
| 代理商： | LT3686AIMSE#TRPBF |
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LT3686A
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3686afa
The LT3686A is a current mode step-down regulator.
The EN/UVLO pin is used to place the LT3686A in shut-
down. The 1.28V threshold on the EN/UVLO pin can be
programmed by an external resistor divider (R4, R5) to
disable the LT3686A. When the EN/UVLO pin is driven
above 1.28V, an internal regulator provides power to the
control circuitry. This regulator includes both overvoltage
and undervoltage lockout to prevent switching when VIN
is more than 37V or less than 3.6V.
Tracking soft-start is implemented by providing constant
current via the SS pin to an external soft-start capacitor
(C4) to generate a voltage ramp. FB voltage is regulated
to the voltage at the SS pin until it exceeds 0.8V; FB
is then regulated to the reference 0.8V. Soft-start also
reduces the oscillator frequency to avoid hitting current
limit during start-up. The SS capacitor is reset during
fault events such as overvoltage, undervoltage, thermal
shutdown and startup.
An oscillator is programmed by resistor RT. The oscillator
sets an RS flip-flop, turning on the internal 1.2A power
switch Q1. An amplifier and comparator monitor the cur-
rent flowing between the VIN and SW pins, turning the
switch off when this current reaches a level determined by
the voltage at VC. An error amplifier measures the output
voltage through an external resistor divider tied to the FB
pin and servos the VC node. If the error amplifier’s output
increases, more current is delivered to the output; if it
decreases, less current is delivered. An active clamp (not
shown) on the VC node provides current limit.
The switch driver operates from either VIN 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
efficient operation.
A comparator monitors the current flowing through the
catch diode via the DA pin and reduces the LT3686A’s
operating frequency when the DA pin current exceeds the
1.7A valley current limit. This helps to control the output
currentinfaultconditionssuchasshortedoutputwithhigh
input voltage. The DA comparator works in conjunction
withtheswitchpeakcurrentlimitcomparatortodetermine
the maximum deliverable current of the LT3686A.
The SYNC/MODE pin doubles as mode select for the
BD active load circuit. The active load is enabled when
SYNC/MODE is driven with sync pulses or tied above
0.8V and disabled when SYNC/MODE is tied below 0.4V.
The LT3686A will prevent pulse skipping at light loads
by regulating the active load. The active load will assist
startup by guaranteeing a minimum load to charge the
boost capacitor. It also hastens the recharge of boost
capacitor when operating beyond maximum duty cycle.
The active load works only when the BD pin is less than 6V.
operAtion
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| LT3686EDD#PBF | 2.65 A SWITCHING REGULATOR, 2500 kHz SWITCHING FREQ-MAX, PDSO10 |
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LT3686EDD | 制造商:LINER 制造商全稱:Linear Technology 功能描述:37V/1.2A Step-Down Regulator in 3mm × 3mm DFN |
| LT3686EDD#PBF | 功能描述:IC REG BUCK ADJ 1.2A 10DFN 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 |
| LT3686EDD#TRPBF | 功能描述:IC REG BUCK ADJ 1.2A 10DFN 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 |
| LT3686EDDPBF | 制造商:LINER 制造商全稱:Linear Technology 功能描述:37V/1.2A Step-Down Regulator in 3mm × 3mm DFN |
| LT3686EDDTRPBF | 制造商:LINER 制造商全稱:Linear Technology 功能描述:37V/1.2A Step-Down Regulator in 3mm × 3mm DFN |
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