- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄44994 > LTC3833IFE#PBF (LINEAR TECHNOLOGY CORP) SWITCHING CONTROLLER, 2000 kHz SWITCHING FREQ-MAX, PDSO20 PDF資料下載
參數(shù)資料
| 型號： | LTC3833IFE#PBF |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | SWITCHING CONTROLLER, 2000 kHz SWITCHING FREQ-MAX, PDSO20 |
| 封裝： | 4.40 MM, LEAD FREE, PLASTIC, TSSOP-20 |
| 文件頁數(shù)： | 3/36頁 |
| 文件大小： | 513K |
| 代理商： | LTC3833IFE#PBF |
第1頁第2頁當前第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頁第32頁第33頁第34頁第35頁第36頁
LTC3833
11
3833f
OPERATION
The voltage on the ITH pin sets the ICMP valley threshold
point. The error amplifier, EA, adjusts this ITH voltage
by comparing the differential feedback signal, VOSNS+
VOSNS–,toa0.6Vinternalreferencevoltage.Consequently,
the LTC3833 regulates the output voltage by forcing the
differentialfeedbackvoltagetobeequaltothe0.6Vinternal
reference. The difference amplifier, DA, converts the dif-
ferential feedback signal to a single-ended input for the
EA. If the load current increases, it causes a drop in the
differential feedback voltage relative to the reference. The
EA forces ITH voltage to rise until the average inductor
current again matches the load current.
Differential Output Sensing
Theoutputvoltageisresistivelydividedexternallytocreate
afeedbackvoltageforthecontroller.Theinternaldifference
amplifier, DA, senses this feedback voltage along with the
output’s remote ground reference to create a differential
feedback voltage. This scheme overcomes any ground
offsets between local ground and remote output ground,
resulting in a more accurate output voltage. The LTC3833
allows for remote output ground deviations as much as
±500mV with respect to local ground.
INTVCC/EXTVCC Power
Power for the top and bottom MOSFET drivers and most
otherinternalcircuitryisderivedfromtheINTVCCpin.Power
on the INTVCC pin is derived in two ways: if the EXTVCC
pin is below 4.6V, then an internal 5.3V low dropout linear
regulator, LDO, supplies INTVCC power from VIN; if the
EXTVCC pin is tied to an external source larger than 4.6V,
then the LDO is shut down and an internal switch shorts
the EXTVCC pin to the INTVCC pin, thereby powering the
INTVCCpinwiththeexternalsourceandhelpingtoincrease
overallefficiencyanddecreaseinternalselfheatingthrough
power dissipated in the LDO. This external power source
could be the output of the step-down switching regulator
itself if the output is programmed to higher than 4.6V.
The top MOSFET driver is biased from the floating boot-
strap capacitor, CB, which normally recharges during
each off cycle through an external Schottky diode when
the top MOSFET turns off. If the VIN voltage is low and
INTVCC drops below 3.65V, undervoltage lockout circuitry
disables the external MOSFET driver and prevents the
power switches from turning on.
Shutdown and Start-Up
The LTC3833 can be shut down using the RUN pin. Pulling
this pin below 1.2V prevents the controller from switch-
ing, and less than 0.75V disables most of the internal bias
circuitry, including the INTVCCregulator.WhenRUNisless
than0.75V,theshutdownIQisabout15μA.PullingtheRUN
pin between 0.75V and 1.2V enables the controller into a
standby mode where all internal circuitry is powered-up
but the external MOSFET driver is disabled. The standby IQ
is about 2mA. Releasing the RUN pin from ground allows
an internal 1.3μA current to pull the pin above 1.2V and
fully enable the controller including the external MOSFET
driver. Alternatively, the RUN pin may be externally pulled
up or driven directly by logic. Be careful not to exceed the
absolutemaximumratingof6Vonthispin.Whenpulledup
by a resistor to an external voltage, the RUN pin will sink
up to 35A of current before reaching 6V. If the external
voltage is above 6V (e.g., VIN), select a large enough resis-
tor value so that the voltage on RUN will not exceed 6V.
The start-up of the controller’s output voltage, VOUT, is
controlled by the voltage on the TRACK/SS pin. When
the voltage on the TRACK/SS pin is less than the 0.6V
internal reference, the LTC3833 regulates the differential
feedback voltage to the TRACK/SS voltage instead of the
0.6V reference. This allows the TRACK/SS pin to be used
for programming a ramp-up time for VOUT by connecting
an external capacitor from the TRACK/SS pin to SGND. An
internal1μApull-upcurrentchargesthiscapacitor,creating
a voltage ramp on the TRACK/SS pin. As the TRACK/SS
voltage rises from 0V to 0.6V (and beyond), the LTC3833
forces the output voltage, VOUT, to ramp up smoothly to
its final value. Alternatively, the TRACK/SS pin can be used
to track the start-up of VOUT to another external supply
as in a master slave configuration. Typically, this requires
connecting a resistor divider from the master supply to
the TRACK/SS pin (see Soft-Start and Tracking).
(Refer to Functional Diagram)
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| LTC3835IGN-1#TR | 3 A SWITCHING CONTROLLER, 580 kHz SWITCHING FREQ-MAX, PDSO16 |
| LTC3835EDHC-1#TRPBF | 3 A SWITCHING CONTROLLER, 580 kHz SWITCHING FREQ-MAX, PDSO16 |
| LTC3835IGN-1 | 3 A SWITCHING CONTROLLER, 580 kHz SWITCHING FREQ-MAX, PDSO16 |
| LTC3835IUFD | 3 A SWITCHING CONTROLLER, 580 kHz SWITCHING FREQ-MAX, PQCC20 |
| LTC3850EUF | 0.1 A DUAL SWITCHING CONTROLLER, 860 kHz SWITCHING FREQ-MAX, PQCC28 |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LTC3833IUDC#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:- 標準包裝:2,500 系列:- PWM 型:電流模式 輸出數(shù):1 頻率 - 最大:500kHz 占空比:96% 電源電壓:4 V ~ 36 V 降壓:無 升壓:是 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:24-WQFN 裸露焊盤 包裝:帶卷 (TR) |
| LTC3833IUDC#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:- 標準包裝:2,500 系列:- PWM 型:電流模式 輸出數(shù):1 頻率 - 最大:500kHz 占空比:96% 電源電壓:4 V ~ 36 V 降壓:無 升壓:是 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:24-WQFN 裸露焊盤 包裝:帶卷 (TR) |
| LTC3834EDHC-1#PBF | 功能描述:IC REG CTRLR BUCK PWM CM 16-DFN RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:- 標準包裝:2,000 系列:- PWM 型:電流模式 輸出數(shù):1 頻率 - 最大:1MHz 占空比:50% 電源電壓:9 V ~ 10 V 降壓:無 升壓:是 回掃:是 反相:無 倍增器:無 除法器:無 Cuk:無 隔離:無 工作溫度:-40°C ~ 85°C 封裝/外殼:8-TSSOP（0.173"，4.40mm 寬） 包裝:帶卷 (TR) |
| LTC3834EDHC-1#TRPBF | 功能描述:IC REG CTRLR BUCK PWM CM 16-DFN RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:- 標準包裝:2,500 系列:- PWM 型:電流模式 輸出數(shù):1 頻率 - 最大:500kHz 占空比:96% 電源電壓:4 V ~ 36 V 降壓:無 升壓:是 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:24-WQFN 裸露焊盤 包裝:帶卷 (TR) |
| LTC3834EFE#PBF | 功能描述:IC REG CTRLR BUCK PWM CM 20TSSOP 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 標準包裝: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 |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。