參數(shù)資料
型號: LTC3546EUFD#PBF
廠商: LINEAR TECHNOLOGY CORP
元件分類: 穩(wěn)壓器
英文描述: DUAL SWITCHING CONTROLLER, 4000 kHz SWITCHING FREQ-MAX, PQCC28
封裝: 4 X 5 MM, LEAD FREE, PLASTIC, MO-220, QFN-28
文件頁數(shù): 5/28頁
文件大小: 356K
代理商: LTC3546EUFD#PBF
LTC3546
13
3546fb
OPERATION
The output capacitor and the inductor supply the power
to the load until ITH exceeds 0.31V, turning on the switch
and the main control loop which starts another cycle.
The Burst Mode peak inductor current can be set externally
via the BMC pin. When this pin is set somewhere between
0V to 0.6V, the voltage on this pin controls the Burst Mode
clamp level. When the BMC pin is pulled to VIN, an internal
Burst Mode clamp level is used.
For lower output voltage ripple at low currents, pulse-
skipping mode can be used. In this mode, the LTC3546
continues to switch at constant frequency down to very low
currents, where it will eventually begin skipping pulses.
Finally, in forced continuous mode, the inductor current
is constantly cycled which creates a xed output voltage
ripple at all output current levels. This feature is desirable in
telecommunications since the noise is a constant frequency
and is thus easy to lter out. Another advantage of this mode
is that the regulator is capable of both sourcing current into
a load and sinking some current from the output. In forced
continuous operation, an overvoltage comparator monitors
the VFB pin and decreases the current limit whenever an
overvoltage condition is detected (VFB > 0.63V).
The SYNC/MODE pin selects what mode the LTC3546 is in.
The SYNC/MODE pin sets the mode for both regulators.
Dropout Operation
When the input supply voltage decreases toward the
output voltage, the duty cycle increases to 100% which
is the dropout condition. In the dropout condition, the
PMOS switch is turned on continuously with the output
voltage being equal to the input voltage minus the volt-
age drops across the internal P-channel MOSFETs and
inductors.
Low Supply Operation
The LTC3546 incorporates an undervoltage lockout circuit
which shuts down the part when the input voltage drops
below about 2.14V to prevent unstable operation.
相關(guān)PDF資料
PDF描述
LTC3546IUFD DUAL SWITCHING CONTROLLER, 4000 kHz SWITCHING FREQ-MAX, PQCC28
LTC3546EUFD DUAL SWITCHING CONTROLLER, 4000 kHz SWITCHING FREQ-MAX, PQCC28
LTC3546IUFD#TR DUAL SWITCHING CONTROLLER, 4000 kHz SWITCHING FREQ-MAX, PQCC28
LTC3546EFE DUAL SWITCHING CONTROLLER, 4000 kHz SWITCHING FREQ-MAX, PDSO28
LTC3546IFE#TRPBF DUAL SWITCHING CONTROLLER, 4000 kHz SWITCHING FREQ-MAX, PDSO28
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
LTC3546EUFDTRPBF 制造商:LINER 制造商全稱:Linear Technology 功能描述:Dual Synchronous, 3A/1A or 2A/2A Confi gurable Step-Down DC/DC Regulator
LTC3546IFE#PBF 功能描述:IC REG BUCK SYNC ADJ DL 28TSSOP 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:- 設(shè)計(jì)資源:Design Support Tool 標(biāo)準(zhǔn)包裝:1 系列:- 類型:升壓(升壓) 輸出類型: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 - 開關(guān):- 電流 - 輸出:100mA 同步整流器:是 工作溫度:-40°C ~ 85°C 安裝類型: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:AS1323-BTTT-30CT
LTC3546IFE#TRPBF 功能描述:IC REG BUCK SYNC ADJ DL 28TSSOP 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:- 設(shè)計(jì)資源:Design Support Tool 標(biāo)準(zhǔn)包裝:1 系列:- 類型:升壓(升壓) 輸出類型: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 - 開關(guān):- 電流 - 輸出:100mA 同步整流器:是 工作溫度:-40°C ~ 85°C 安裝類型: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:AS1323-BTTT-30CT
LTC3546IFEPBF 制造商:LINER 制造商全稱:Linear Technology 功能描述:Dual Synchronous, 3A/1A or 2A/2A Confi gurable Step-Down DC/DC Regulator
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