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參數(shù)資料
| 型號： | LTC3780EG |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | DIODE SCHOTTKY SINGLE 25V 200mW 0.4V-vf 200mA-IFM 10mA-IF 0.5uA-IR SOD-123 3K/REEL |
| 中文描述： | 3 A SWITCHING CONTROLLER, 440 kHz SWITCHING FREQ-MAX, PDSO24 |
| 封裝： | 5.30 MM, PLASTIC, SSOP-24 |
| 文件頁數(shù)： | 14/28頁 |
| 文件大?。?/td> | 421K |
| 代理商： | LTC3780EG |
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LTC3780
3780f
diode of Synchronous Switch B or the Schottky diode,
which is in parallel in with Synchronous Switch B, is used
to discharge inductor current. As a result, some cycles will
be skipped when the output load current drops below 1%
of the maximum designed load in order to maintain the
output voltage.
When the FCB pin voltage is tied to the INTV
CC
pin, the
controller enters constant frequency Discontinuous Cur-
rent mode (DCM). For Boost operation, Synchronous
Switch D is held off whenever the I
TH
pin is below a
threshold voltage. In every cycle, Switch C is used to
charge inductor current. After the output voltage is high
enough, the controller will enter continuous current Buck
mode for one cycle to discharge inductor current. In the
following cycle, the controller will resume DCM Boost
operation. For Buck operation, constant frequency Dis-
continuous Current mode sets a minimum negative induc-
tor current level. Synchronous Switch B is turned off
whenever inductor current is lower than this level. At very
light loads, this constant frequency operation is not as
efficient as Burst Mode operation or Skip-Cycle, but does
provide lower noise, constant frequency operation.
FREQUENCY SYNCHRONIZATION AND
FREQUENCY SETUP
The phase-locked loop allows the internal oscillator to be
synchronized to an external source via the PLLIN pin. The
phase detector output at the PLLFLTR pin is also the DC
frequency control input of the oscillator. The frequency
ranges from 200kHz to 400kHz, corresponding to a DC
voltage input from 0V to 2.4V at PLLFLTR. When locked,
the PLL aligns the turn on of the top MOSFET to the rising
edge of the synchronizing signal. When PLLIN is left open,
the PLLFLTR pin goes low, forcing the oscillator to its
minimum frequency.
OPERATIOU
INTV
CC
/EXTV
CC
POWER
Power for all power MOSFET drivers and most internal
circuitry is derived from the INTV
CC
pin. When the EXTV
CC
pin is left open, an internal 6V low dropout linear regulator
supplies INTV
CC
power. If EXTV
CC
is taken above 5.7V, the
6V regulator is turned off and an internal switch is turned
on, connecting EXTV
CC
to INTV
CC
. This allows the INTV
CC
power to be derived from a high efficiency external source.
POWER GOOD (PGOOD) PIN
The PGOOD pin is connected to an open drain of an internal
MOSFET. The MOSFET turns on and pulls the pin low when
the output is not within
±
7.5% of the nominal output level
as determined by the resistive feedback divider. When the
output meets the
±
7.5% requirement, the MOSFET is
turned off and the pin is allowed to be pulled up by an
external resistor to a source of up to 7V.
FOLDBACK CURRENT
Foldback current limiting is activated when the output
voltage falls below 70% of its nominal level, reducing power
waste. During start-up, foldback current limiting is disabled.
INPUT UNDERVOLTAGE RESET
The SS capacitor will be reset if the input voltage is allowed
to fall below approximately 4V. The SS capacitor will
attempt to charge through a normal soft-start ramp after
the input voltage rises above 4V.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| LTC3780EUH | DIODE SCHOTTKY SINGLE 25V 200mW 0.4V-vf 200mA-IFM 10mA-IF 0.5uA-IR SOD-323 3K/REEL |
| LTC3830EGN | High Power Step-Down Synchronous DC/DC Controllers for Low Voltage Operation |
| LTC3830 | 16-Bit Bus Transceiver With 3-State Outputs 48-SSOP -40 to 85 |
| LTC3830-1 | 16-Bit Bus Transceiver With 3-State Outputs 54-BGA MICROSTAR JUNIOR -40 to 85 |
| LTC3830-1ES8 | 16-Bit Bus Transceiver With 3-State Outputs 56-BGA MICROSTAR JUNIOR -40 to 85 |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LTC3780EG#PBF | 功能描述:IC REG CTRLR BST PWM CM 24-SSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:- 特色產(chǎn)品:LM3753/54 Scalable 2-Phase Synchronous Buck Controllers 標(biāo)準(zhǔn)包裝:1 系列:PowerWise® PWM 型:電壓模式 輸出數(shù):1 頻率 - 最大:1MHz 占空比:81% 電源電壓:4.5 V ~ 18 V 降壓:是 升壓:無 回掃:無 反相:無 倍增器:無 除法器:無 Cuk:無 隔離:無 工作溫度:-5°C ~ 125°C 封裝/外殼:32-WFQFN 裸露焊盤 包裝:Digi-Reel® 產(chǎn)品目錄頁面:1303 (CN2011-ZH PDF) 其它名稱:LM3754SQDKR |
| LTC3780EG#TR | 制造商:Linear Technology 功能描述:DC DC Cntrlr Dual-OUT Synchronous Boost/Buck Controller 4V to 36V Input 24-Pin SSOP T/R |
| LTC3780EG#TRPBF | 功能描述:IC REG CTRLR BST PWM CM 24-SSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:- 標(biāo)準(zhǔn)包裝:4,500 系列:PowerWise® PWM 型:控制器 輸出數(shù):1 頻率 - 最大:1MHz 占空比:95% 電源電壓:2.8 V ~ 5.5 V 降壓:是 升壓:無 回掃:無 反相:無 倍增器:無 除法器:無 Cuk:無 隔離:無 工作溫度:-40°C ~ 125°C 封裝/外殼:6-WDFN 裸露焊盤 包裝:帶卷 (TR) 配用:LM1771EVAL-ND - BOARD EVALUATION LM1771 其它名稱:LM1771SSDX |
| LTC3780EGPBF | 制造商:Linear Technology 功能描述:4-Switch Buck-Boost Controller SSOP24 |
| LTC3780EUH | 制造商:Linear Technology 功能描述:DC DC Cntrlr Dual-OUT Synchronous Boost/Buck Controller 4V to 36V Input 32-Pin QFN EP |
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