參數(shù)資料
型號(hào)： LTC3879IUD#PBF
廠商： LINEAR TECHNOLOGY CORP
元件分類： 穩(wěn)壓器
英文描述： SWITCHING CONTROLLER, PQCC16
封裝： 3 X 3 MM, LEAD FREE, PLASTIC, MO-220WEED-4, QFN-16
文件頁(yè)數(shù)： 27/28頁(yè)
文件大?。?/td> 302K
代理商： LTC3879IUD#PBF
LTC3879
8
3879f
PIN FUNCTIONS
TRACK/SS (Pin 1): External Tracking and Soft-Start Input.
The LTC3879 regulates VFB to the smaller of 0.6V or the
voltage on the TRACK/SS pin. An internal 1μA pull-up
current source is connected to this pin. A capacitor to
ground at this pin sets the ramp time to the nal regulated
output voltage. Alternatively, a resistor divider on another
voltage supply connected to this pin allows the output to
track the other supply during start-up.
PGOOD (Pin 2): Power Good Output. This open-drain
logic output is pulled to ground when the output voltage is
outside of a ±10% window around the regulation point.
VRNG (Pin 3): VDS Sense Voltage Range Input. The maxi-
mum allowed bottom MOSFET VDS sense voltage between
SW and PGND is equal to (0.133)VRNG. The voltage applied
to VRNG can be any value between 0.2V and 2V. If VRNG is
tied to SGND, the device operates with a maximum valley
current sense threshold of 30mV typical. If VRNG is tied
to INTVCC, the device operates with a maximum valley
current sense threshold of 75mV typical.
MODE (Pin 4): MODE Input. Connect this pin to INTVCC to
enable discontinuous mode for light load operation. Con-
nect this pin to SGND to force continuous mode operation
in all conditions.
ITH (Pin 5): Current Control Threshold and Error Amplier
Compensation Point. The current comparator threshold
increases with this control voltage. The voltage ranges
from 0V to 2.4V, with 0.8V corresponding to zero sense
voltage (zero current).
SGND (Pin 6): Signal Ground. All small-signal components
should be connected to SGND. Connect SGND to PGND
using a single PCB trace.
ION (Pin 7): On-Time Current Input. Tie a resistor from
VIN to this pin to set the one-shot timer current and thus
the switching frequency.
VFB (Pin 8): Error Amplier Feedback Input. This pin con-
nects the error amplier to an external resistive divider
from VOUT.
RUN (Pin 9): Run Control Input. RUN below 1.5V disables
switching by forcing TG and BG low. RUN less than 1.5V
but greater than 0.7V enables all internal bias including
the INTVCC output. RUN below 0.7V shuts down all bias
and places the LTC3879 into micropower shutdown mode
of approximately 18μA. There is an internal 1.2μA pull-up
current source for operation with an open-collector RUN
signal.
VIN (Pin 10): Main Input Supply. The supply voltage can
range from 4V to 38V. For increased noise immunity de-
couple this pin to PGND with an RC lter.
INTVCC (Pin 11): Internal 5.3V Regulator Output. The
driver and control circuits are powered from this voltage.
Decouple this pin to PGND with a minimum of 1μF, 10V
X5R or X7R ceramic capacitor.
BG (Pin 12): Bottom Gate Drive. This pin drives the gate
of the bottom N-Channel power MOSFET between PGND
and INTVCC.
PGND (Pin 13): Power Ground. Connect this pin as close
as practical to the source of the bottom N-channel power
MOSFET, the (–) terminal of CINTVCC and the (–) terminal
of CVIN.
SW (Pin 14): Switch Node. The (–) terminal of the bootstrap
capacitor, CB, connects to this node. This pin swings from
a diode voltage below ground up to VIN.
TG (Pin 15): Top Gate Drive. This pin drives the gate of the
top N-channel power MOSFET between SW and BOOST.
BOOST (Pin 16): Boosted Floating Driver Supply. The (+)
terminal of the bootstrap capacitor, CB, connects to this
node. This node swings from (INTVCC – VSCHOTTKY) to
VIN + (INTVCC – VSCHOTTKY).
Exposed Pad (Pin 17): The Exposed Pad is SGND and
must be soldered to the PCB.
相關(guān)PDF資料
PDF描述
LTC3880IUJ-1#TRPBF 0.1 A DUAL SWITCHING CONTROLLER, 1000 kHz SWITCHING FREQ-MAX, PQCC40
LTC3880IUJ#PBF 0.1 A DUAL SWITCHING CONTROLLER, 1000 kHz SWITCHING FREQ-MAX, PQCC40
LTC3880EUJ-1#TRPBF 0.1 A DUAL SWITCHING CONTROLLER, 1000 kHz SWITCHING FREQ-MAX, PQCC40
LTC3880EUJ-1#PBF 0.1 A DUAL SWITCHING CONTROLLER, 1000 kHz SWITCHING FREQ-MAX, PQCC40
LTC3880IUJ-1#PBF 0.1 A DUAL SWITCHING CONTROLLER, 1000 kHz SWITCHING FREQ-MAX, PQCC40
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
LTC3880EUJ#PBF 功能描述:IC REG CTRLR BUCK PWM CM 40-QFN RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:PolyPhase® 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(wú) 回掃:無(wú) 反相:無(wú) 倍增器:無(wú) 除法器:無(wú) Cuk:無(wú) 隔離:無(wú) 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(yè)面:1303 (CN2011-ZH PDF) 其它名稱:LM3754SQDKR
LTC3880EUJ#TRMPBF 功能描述:IC REG CTRLR BUCK PWM CM 40-QFN RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:PolyPhase® 標(biāo)準(zhǔn)包裝:4,000 系列:- PWM 型:電壓模式 輸出數(shù):1 頻率 - 最大:1.5MHz 占空比:66.7% 電源電壓:4.75 V ~ 5.25 V 降壓:是 升壓:無(wú) 回掃:無(wú) 反相:無(wú) 倍增器:無(wú) 除法器:無(wú) Cuk:無(wú) 隔離:無(wú) 工作溫度:-40°C ~ 85°C 封裝/外殼:40-VFQFN 裸露焊盤 包裝:帶卷 (TR)
LTC3880EUJ#TRPBF 功能描述:IC REG CTRLR BUCK PWM CM 40-QFN RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:PolyPhase® 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(wú) 回掃:無(wú) 反相:無(wú) 倍增器:無(wú) 除法器:無(wú) Cuk:無(wú) 隔離:無(wú) 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
LTC3880EUJ-1#PBF 功能描述:IC REG CTRLR BUCK PWM CM 40-QFN RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:PolyPhase® 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(wú) 回掃:無(wú) 反相:無(wú) 倍增器:無(wú) 除法器:無(wú) Cuk:無(wú) 隔離:無(wú) 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(yè)面:1303 (CN2011-ZH PDF) 其它名稱:LM3754SQDKR
LTC3880EUJ-1#TRMPBF 功能描述:IC REG CTRLR BUCK PWM CM 40-QFN RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:PolyPhase® 標(biāo)準(zhǔn)包裝:4,000 系列:- PWM 型:電壓模式 輸出數(shù):1 頻率 - 最大:1.5MHz 占空比:66.7% 電源電壓:4.75 V ~ 5.25 V 降壓:是 升壓:無(wú) 回掃:無(wú) 反相:無(wú) 倍增器:無(wú) 除法器:無(wú) Cuk:無(wú) 隔離:無(wú) 工作溫度:-40°C ~ 85°C 封裝/外殼:40-VFQFN 裸露焊盤 包裝:帶卷 (TR)
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