- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄44995 > LTC3891MPFE#PBF (LINEAR TECHNOLOGY CORP) SWITCHING CONTROLLER, 900 kHz SWITCHING FREQ-MAX, PDSO20 PDF資料下載
參數(shù)資料
| 型號： | LTC3891MPFE#PBF |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | SWITCHING CONTROLLER, 900 kHz SWITCHING FREQ-MAX, PDSO20 |
| 封裝： | 4.40 MM, LEAD FREE, PLASTIC, TSSOP-20 |
| 文件頁數(shù)： | 32/32頁 |
| 文件大小： | 1931K |
| 代理商： | LTC3891MPFE#PBF |
第1頁第2頁第3頁第4頁第5頁第6頁第7頁第8頁第9頁第10頁第11頁第12頁第13頁第14頁第15頁第16頁第17頁第18頁第19頁第20頁第21頁第22頁第23頁第24頁第25頁第26頁第27頁第28頁第29頁第30頁第31頁當(dāng)前第32頁
LTC3891
9
3891f
PIN FUNCTIONS
PLLIN/MODE (Pin 1/Pin 3): External Synchronization
Input to Phase Detector and Forced Continuous Mode
Input. When an external clock is applied to this pin, the
phase-locked loop will force the rising TG signal to be
synchronized with the rising edge of the external clock,
and the regulator operates in forced continuous mode.
When not synchronizing to an external clock, this input
determines how the LTC3891 operates at light loads. Pull-
ing this pin to ground selects Burst Mode operation. An
internal 100k resistor to ground also invokes Burst Mode
operation when the pin is floated. Tying this pin to INTVCC
forces continuous inductor current operation. Tying this
pin to a voltage greater than 1.2V and less than INTVCC
–1.3V selects pulse-skipping operation.
SGND (Pins 2, 3, Exposed Pad Pin 21/Pins 4, 5,
ExposedPadPin21):Small-signalground,mustberouted
separately from high current grounds to the common
(–) terminals of the CIN capacitor. Pins 2, 3/4, 5, must
both be electrically connected to small signal ground for
proper operation.The exposed pad must be soldered to
PCB ground for rated thermal performance.
RUN (Pin 4/Pin 6): Digital Run Control Input. Forcing this
pin below 1.16V shuts down the controller. Forcing this
pin below 0.7V shuts down the entire LTC3891, reducing
quiescent current to approximately 14A.
SENSE– (Pin 5/Pin 7): The (–) Input to the Differential
Current Comparator. When greater than INTVCC – 0.5V, the
SENSE– pin supplies power to the current comparator.
SENSE+ (Pin 6/Pin 8): The (+) input to the differential
current comparator is normally connected to DCR sensing
networkorcurrentsensingresistor.TheITHpinvoltageand
controlledoffsetsbetweentheSENSE–andSENSE+pinsin
conjunction with RSENSE set the current trip threshold.
VFB (Pin 7/Pin 9): Receives the remotely sensed feed-
back voltage from an external resistive divider across
the output.
ITH (Pin 8/Pin 10): Error Amplifier Outputs and Switching
Regulator Compensation Point. The current comparator
trip point increases with this control voltage.
PGOOD (Pin 9/Pin 11): Open-Drain Logic Output. PGOOD
is pulled to ground when the voltage on the VFB pin is not
within 10% of its set point.
TG (Pin 10/Pin 12): High Current Gate Drives for Top
N-channel MOSFET. This is the output of floating driver
with a voltage swing equal to INTVCC superimposed on
the switch node voltage SW.
SW (Pin 11/ Pin 13): Switch Node Connection to Induc-
tor.
BOOST (Pin 12/Pin 14): Bootstrapped Supply to the Top-
side Floating Driver. A capacitor is connected between the
BOOST and SW pin and a Schottky diode is tied between
the BOOST and INTVCC pins. Voltage swing at the BOOST
pin is from INTVCC to (VIN + INTVCC).
BG (Pin 13/Pin 15): High Current Gate Drive for Bottom
(Synchronous) N-channel MOSFET. Voltage swing at this
pin is from ground to INTVCC.
INTVCC (Pin 14/Pin 16): Output of the Internal Linear
Low Dropout Regulator. The driver and control circuits
are powered from this voltage source. Must be decoupled
to PGND with a minimum of 2.2F ceramic or other low
ESR capacitor. Do not use the INTVCC pin for any other
purpose.
EXTVCC (Pin 15/Pin 17): External Power Input to an
Internal LDO Connected to INTVCC. This LDO supplies
INTVCC power, bypassing the internal LDO powered from
VIN whenever EXTVCC is higher than 4.7V. See EXTVCC
Connection in the Applications Information section. Do
not float or exceed 14V on this pin.
PGND (Pin 16/Pin 18): Driver Power Ground. Connects to
the source of bottom (synchronous) N-channel MOSFET
and the (–) terminal of CIN.
VIN (Pin 17/Pin 19): Main Supply Pin. A bypass capacitor
should be tied between this pin and the SGND pins.
ILIM (Pin 18/Pin 20): Current Comparator Sense Voltage
Range Inputs. Tying this pin to SGND, FLOAT or INTVCC
sets the maximum current sense threshold to one of three
different levels for the comparator.
(QFN/eTSSOP)
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| LTC3891IUDC#PBF | SWITCHING CONTROLLER, 900 kHz SWITCHING FREQ-MAX, PQCC20 |
| LTC3891EUDC#PBF | SWITCHING CONTROLLER, 900 kHz SWITCHING FREQ-MAX, PQCC20 |
| LTC3900MPS8#TR | SWITCHING REGULATOR, PDSO8 |
| LTC3900MPS8#PBF | SWITCHING REGULATOR, PDSO8 |
| LTC3900HS8 | SWITCHING REGULATOR, PDSO8 |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LTC3891MPUDC#PBF | 功能描述:IC REG CTRLR BUCK PWM CM 20-QFN 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 |
| LTC3891MPUDC#TRPBF | 功能描述:IC REG CTRLR BUCK PWM CM 20-QFN 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 |
| LTC3900ES8 | 功能描述:IC DRIVER RECT SYNC CONV 8SOIC RoHS:否 類別:集成電路 (IC) >> PMIC - MOSFET，電橋驅(qū)動器 - 外部開關(guān) 系列:- 標(biāo)準(zhǔn)包裝:5 系列:- 配置:低端 輸入類型:非反相 延遲時間:600ns 電流 - 峰:12A 配置數(shù):1 輸出數(shù):1 高端電壓 - 最大（自引導(dǎo)啟動）:- 電源電壓:14.2 V ~ 15.8 V 工作溫度:-20°C ~ 60°C 安裝類型:通孔 封裝/外殼:21-SIP 模塊 供應(yīng)商設(shè)備封裝:模塊 包裝:散裝 配用:BG2A-NF-ND - KIT DEV BOARD FOR IGBT 其它名稱:835-1063 |
| LTC3900ES8#PBF | 功能描述:IC DRIVER RECT SYNC CONV 8SOIC RoHS:是 類別:集成電路 (IC) >> PMIC - MOSFET，電橋驅(qū)動器 - 外部開關(guān) 系列:- 標(biāo)準(zhǔn)包裝:5 系列:- 配置:低端 輸入類型:非反相 延遲時間:600ns 電流 - 峰:12A 配置數(shù):1 輸出數(shù):1 高端電壓 - 最大（自引導(dǎo)啟動）:- 電源電壓:14.2 V ~ 15.8 V 工作溫度:-20°C ~ 60°C 安裝類型:通孔 封裝/外殼:21-SIP 模塊 供應(yīng)商設(shè)備封裝:模塊 包裝:散裝 配用:BG2A-NF-ND - KIT DEV BOARD FOR IGBT 其它名稱:835-1063 |
| LTC3900ES8#TR | 功能描述:IC DRIVER RECT SYNC CONV 8SOIC RoHS:否 類別:集成電路 (IC) >> PMIC - MOSFET，電橋驅(qū)動器 - 外部開關(guān) 系列:- 標(biāo)準(zhǔn)包裝:5 系列:- 配置:低端 輸入類型:非反相 延遲時間:600ns 電流 - 峰:12A 配置數(shù):1 輸出數(shù):1 高端電壓 - 最大（自引導(dǎo)啟動）:- 電源電壓:14.2 V ~ 15.8 V 工作溫度:-20°C ~ 60°C 安裝類型:通孔 封裝/外殼:21-SIP 模塊 供應(yīng)商設(shè)備封裝:模塊 包裝:散裝 配用:BG2A-NF-ND - KIT DEV BOARD FOR IGBT 其它名稱:835-1063 |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。