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參數(shù)資料
| 型號： | LTC3789EUFD#TRPBF |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 0.1 A SWITCHING CONTROLLER, 710 kHz SWITCHING FREQ-MAX, PQCC28 |
| 封裝： | 4 X 5 MM, LEAD FREE, PLASTIC, MO-220, QFN-28 |
| 文件頁數(shù)： | 27/28頁 |
| 文件大小： | 486K |
| 代理商： | LTC3789EUFD#TRPBF |
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LTC3789
8
3789f
pin FuncTions
Line Transient
Typical perForMance characTerisTics T
A = 25°C unless otherwise noted.
(SSOP/QFN)
VFB(Pin1/Pin26):ErrorAmplifierFeedbackPin.Receives
the feedback voltage for the controller from an external
resistive divider across the output.
SS (Pin 2/Pin 27): External Soft-Start Input. The LTC3789
regulates the VFB voltage to the smaller of 0.8V or the
voltage on the SS pin. A internal 3A pull-up current
source is connected to this pin. A capacitor to ground
at this pin sets the ramp time to final regulated output
voltage.
SENSE+ (Pin 3/Pin 28): The (+) Input to the Current Sense
Comparator. The ITH pin voltage and controlled offsets
between the SENSE– and SENSE+ pins, in conjunction
with RSENSE, set the current trip threshold.
SENSE– (Pin 4/Pin 1): The (–) Input to the Current Sense
Comparator.
ITH (Pin 5/Pin 2): Error Amplifier Output and Switching
RegulatorCompensationPoint.Thechannel’scurrentcom-
parator trip point increases with this control voltage.
SGND (Pin 6/Pins 3, Exposed Pad Pin 29): Small Signal
Ground. Must be routed separately from high current
groundstothecommon(–)terminalsoftheCINcapacitors.
In the QFN package, the exposed pad is SGND. It must be
soldered to PCB ground for rated thermal performance.
MODE/PLLIN (Pin 7/Pin 4): Mode Selection or External
Synchronization Input to Phase Detector. This is a dual-
purpose pin. When external frequency synchronization is
not used, this pin selects the operating mode. The pin can
be tied to SGND or INTVCC. SGND or below 0.8V enables
forced continuous mode. INTVCC enables pulse-skipping
mode. For external sync, apply a clock signal to this pin;
the internal PLL will synchronize the internal oscillator
to the clock. The PLL composition network is integrated
into the IC.
FREQ(Pin8/Pin5):FrequencySetPin.Thereisaprecision
10A current flowing out of this pin. A resistor to ground
sets a voltage which, in turn, programs the frequency.
Alternatively, this pin can be driven with a DC voltage to
vary the frequency of the internal oscillator.
RUN (Pin 9/Pin 6): Run Control Input. Forcing the pin
below 0.5V shuts down the controller, reducing quiescent
current. There are 1.2A pull-up currents for this pin.
Once the RUN pin rises above 1.22V, the IC is turned on,
and an additional 5A pull-up current is added to the pin.
VINSNS (Pin 10/Pin 7): VIN Sense Input to the Buck-Boost
Transition Comparator. Connect this pin to the drain of the
top N-channel MOSFET on the input side.
IL
2A/DIV
VITH
VIN
30V TO 5V
VOUT (AC)
500mV/DIV
3789 G28
1ms/DIV
IL
2A/DIV
VITH
VIN
5V TO 30V
VOUT (AC)
500mV/DIV
3789 G29
1ms/DIV
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LTC3789IGN#PBF | 功能描述:IC REG CTRLR BST PWM CM 28-SSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:- 標準包裝: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 |
| LTC3789IGN#TRPBF | 功能描述:IC REG CTRLR BST PWM CM 28-SSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:- 標準包裝: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 |
| LTC3789IUFD#PBF | 功能描述:IC REG CTRLR BST PWM CM 28-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: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 |
| LTC3789IUFD#TRPBF | 功能描述:IC REG CTRLR BST PWM CM 28-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: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 |
| LTC3789IUFDPBF | 制造商:Linear Technology 功能描述:4-Switch Buck-Boost Controller QFN28EP |
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