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參數(shù)資料
| 型號： | LTC3586EUFE#PBF |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 3 A BATTERY CHARGE CONTROLLER, 2700 kHz SWITCHING FREQ-MAX, PQCC38 |
| 封裝： | 4 X 6 MM, 0.75 MM HEIGHT, LEAD FREE, PLASTIC, QFN-38 |
| 文件頁數(shù)： | 17/36頁 |
| 文件大?。?/td> | 317K |
| 代理商： | LTC3586EUFE#PBF |
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LTC3586/LTC3586-1
24
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Zero Current Comparator
The zero current comparator monitors the inductor current
to the output and shuts off the synchronous rectier once
the current drops to approximately 65mA. This prevents
the inductor current from reversing in polarity thereby
improving efciency at light loads.
Antiringing Control
The antiringing control circuitry prevents high frequency
ringing of the SW pin as the inductor current goes to zero
in discontinuous mode. The damping of the resonant
circuit formed by L and CSW (capacitance of the SW4
pin) is achieved internally by switching a 150Ω resistor
across the inductor.
PMOS Synchronous Rectier
To prevent the inductor current from running away,
the PMOS synchronous rectier is only enabled when
VOUT > (VIN + 130mV).
Output Disconnect and Inrush Limiting
The LTC3586/LTC3586-1 boost converter is designed to
allow true output disconnect by eliminating body diode
conduction of the internal PMOS rectier. This allows VOUT
to go to zero volts during shutdown, drawing zero current
from the input source. It also allows for inrush current
limiting at start-up, minimizing surge currents seen by the
input supply. Note that to obtain the advantage of output
disconnect, there must not be an external Schottky diode
connected between the SW4 and VOUT4 pin.
Short Circuit Protection
Unlike most boost converters, the LTC3586/LTC3586-1
boost converter allows its output to be short-circuited
due to the output disconnect feature. It incorporates
internal features such as current limit foldback and thermal
shutdown for protection from an excessive overload or
short circuit.
VIN > VOUT Operation
The LTC3586/LTC3586-1 boost converter will maintain
voltage regulation even if the input voltage is above
the output voltage. This is achieved by terminating the
switching of the synchronous PMOS and applying VIN4
statically on its gate. This ensures that the slope of the
inductor current will reverse during the time when cur-
rent is owing to the output. Since the PMOS no longer
acts as a low impedance switch in this mode, there will
be more power dissipation within the IC. This will cause
a sharp drop in the efciency (see Typical Performance
Characteristics, Boost Efciency vs VIN4). The maximum
output current should be limited in order to maintain an
acceptable junction temperature.
Boost Soft-Start
The LTC3586/LTC3586-1 boost converter provides soft-
start by slowly ramping the peak inductor current from
zero to a maximum of 2.4A in about 500μs. Ramping the
peak inductor current limits transient inrush currents
during start-up. A soft-start cycle occurs whenever the
boost is enabled, or after a fault condition has occurred
(thermal shutdown or UVLO).
Boost Overvoltage Protection
If the FB4 node were inadvertently shorted to ground, then
the boost converter output would increase indenitely with
the maximum current that could be sourced from VIN4. The
LTC3586/LTC3586-1 protects against this by shutting off
the main switch if the output voltage exceeds 5.3V.
OPERATION
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| LTC3586EUFE-1#PBF | BATTERY CHARGE CONTROLLER, PQCC38 |
| LTC3586EUFE-1#TRPBF | BATTERY CHARGE CONTROLLER, PQCC38 |
| LTC3672BEDC-1#PBF | 1.1 A SWITCHING REGULATOR, 2700 kHz SWITCHING FREQ-MAX, PDSO8 |
| LTC3728LZEUH | 3 A DUAL SWITCHING CONTROLLER, 590 kHz SWITCHING FREQ-MAX, PQCC28 |
| LTC3773EUHF | SWITCHING CONTROLLER, 700 kHz SWITCHING FREQ-MAX, PQCC38 |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LTC3586EUFE-TRPBF | 制造商:LINER 制造商全稱:Linear Technology 功能描述:High Effi ciency USB Power Manager with Boost, Buck-Boost and Dual Bucks |
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| LTC3588EDD-1#PBF | 功能描述:IC ENERGY HARVESTING PSU 10DFN RoHS:是 類別:集成電路 (IC) >> PMIC - 電源管理 - 專用 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準包裝:50 系列:- 應(yīng)用:熱電冷卻器 電流 - 電源:- 電源電壓:3 V ~ 5.5 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:28-SOIC（0.173"，4.40mm 寬）裸露焊盤 供應(yīng)商設(shè)備封裝:28-TSSOP 裸露焊盤 包裝:管件 產(chǎn)品目錄頁面:1410 (CN2011-ZH PDF) |
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