參數(shù)資料
型號(hào)： LTC3586EUFE-1#TRPBF
廠商： LINEAR TECHNOLOGY CORP
元件分類(lèi)： 穩(wěn)壓器
英文描述： BATTERY CHARGE CONTROLLER, PQCC38
封裝： 4 X 6 MM, 0.75 MM HEIGHT, LEAD FREE, PLASTIC, QFN-38
文件頁(yè)數(shù)： 14/36頁(yè)
文件大?。?/td> 317K
代理商： LTC3586EUFE-1#TRPBF
LTC3586/LTC3586-1
21
3586fa
and the input capacitance of the FBx pin and also helps
to improve transient response for output voltages much
greater than 0.8V. A variety of capacitor sizes can be used
for CFB but a value of 10pF is recommended for most ap-
plications. Experimentation with capacitor sizes between
2pF and 22pF may yield improved transient response.
Buck Regulator Operating Modes
The LTC3586/LTC3586-1’s buck regulators include two
possible operating modes to meet the noise/ power needs
of a variety of applications.
In pulse-skip mode, an internal latch is set at the start of
every cycle which turns on the main P-channel MOSFET
switch. During each cycle, a current comparator compares
the peak inductor current to the output of an error amplier.
The output of the current comparator resets the internal
latch which causes the main P-channel MOSFET switch to
turn off and the N-channel MOSFET synchronous rectier
to turn on. The N-channel MOSFET synchronous rectier
turns off at the end of the 2.25MHz cycle or if the current
through the N-channel MOSFET synchronous rectier
drops to zero. Using this method of operation, the error
amplier adjusts the peak inductor current to deliver the
required output power. All necessary compensation is
internal to the switching regulator requiring only a single
ceramic output capacitor for stability. At light loads, the
inductor current may reach zero on each pulse which will
turn off the N-channel MOSFET synchronous rectier.
In this case, the switch node (SW1, SW2) goes high
impedance and the switch node voltage will “ring”. This
is discontinuous mode operation, and is normal behavior
for a switching regulator. At very light loads, the buck
regulators will automatically skip pulses as needed to
maintain output regulation.
OPERATION
At high duty cycles (VOUTx > VINx /2) it is possible for the
inductor current to reverse, causing the buck regulator
to operate continuously at light loads. This is normal and
regulation is maintained, but the supply current will increase
to several milliamperes due to continuous switching.
In Burst Mode operation, the buck regulator automati-
cally switches between xed frequency PWM operation
and hysteretic control as a function of the load current.
At light loads, the buck regulators operate in hysteretic
mode in which the output capacitor is charged to a volt-
age slightly higher than the regulation point. The buck
converter then goes into sleep mode, during which the
output capacitor provides the load current. In sleep mode,
most of the regulator’s circuitry is powered down, helping
conserve battery power. When the output voltage drops
below a predetermined value, the buck regulator circuitry
is powered on and the normal PWM operation resumes.
The duration for which the buck regulator operates in
sleep mode depends on the load current. The sleep time
decreases as the load current increases. Beyond a certain
load current point (about 1/4 rated output load current) the
step-down switching regulators will switch to a low noise
constant frequency PWM mode of operation, much the
same as pulse-skip operation at high loads. For applica-
tions that can tolerate some output ripple at low output
currents, Burst Mode operation provides better efciency
than pulse skip at light loads while still providing the full
specied output current of the buck regulator.
The buck regulators allow mode transition on the y,
providing seamless transition between modes even under
load. This allows the user to switch back and forth between
modes to reduce output ripple or increase low current
efciency as needed.
Buck Regulator in Shutdown
The buck regulators are in shutdown when not enabled for
operation. In shutdown, all circuitry in the buck regulator
is disconnected from the buck regulator input supply
leaving only a few nanoamps of leakage current. The
buck regulator outputs are individually pulled to ground
through a 10k resistor on the switch pins (SW1 and SW2)
when in shutdown.
VINx
LTC3586/
LTC3586-1
L
SWx
R1
COUT
X = 1, 2
CFB
VOUTx
R2
3586 F05
FBx
GND
Figure 5. Buck Converter Application Circuit
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
LTC3586EUFE-2#PBF 功能描述:IC USB POWER MANAGER HE 38-QFN RoHS:是 類(lèi)別:集成電路 (IC) >> PMIC - 電源管理 - 專用 系列:Bat-Track™, PowerPath™ 標(biāo)準(zhǔn)包裝:1 系列:- 應(yīng)用:手持/移動(dòng)設(shè)備 電流 - 電源:- 電源電壓:3 V ~ 5.5 V 工作溫度:-40°C ~ 85°C 安裝類(lèi)型:表面貼裝 封裝/外殼:14-WFDFN 裸露焊盤(pán) 供應(yīng)商設(shè)備封裝:14-LLP-EP（4x4） 包裝:Digi-Reel® 配用:LP3905SD-30EV-ND - BOARD EVALUATION LP3905SD-30 其它名稱:LP3905SD-30DKR
LTC3586EUFE-2#TRPBF 功能描述:IC USB POWER MANAGER HE 38-QFN RoHS:是 類(lèi)別:集成電路 (IC) >> PMIC - 電源管理 - 專用 系列:Bat-Track™, PowerPath™ 標(biāo)準(zhǔn)包裝:1 系列:- 應(yīng)用:手持/移動(dòng)設(shè)備 電流 - 電源:- 電源電壓:3 V ~ 5.5 V 工作溫度:-40°C ~ 85°C 安裝類(lèi)型:表面貼裝 封裝/外殼:14-WFDFN 裸露焊盤(pán) 供應(yīng)商設(shè)備封裝:14-LLP-EP（4x4） 包裝:Digi-Reel® 配用:LP3905SD-30EV-ND - BOARD EVALUATION LP3905SD-30 其它名稱:LP3905SD-30DKR
LTC3586EUFE-3#PBF 功能描述:IC USB POWER MANAGER HE 38-QFN RoHS:是 類(lèi)別:集成電路 (IC) >> PMIC - 電源管理 - 專用 系列:Bat-Track™, PowerPath™ 標(biāo)準(zhǔn)包裝:1 系列:- 應(yīng)用:手持/移動(dòng)設(shè)備 電流 - 電源:- 電源電壓:3 V ~ 5.5 V 工作溫度:-40°C ~ 85°C 安裝類(lèi)型:表面貼裝 封裝/外殼:14-WFDFN 裸露焊盤(pán) 供應(yīng)商設(shè)備封裝:14-LLP-EP（4x4） 包裝:Digi-Reel® 配用:LP3905SD-30EV-ND - BOARD EVALUATION LP3905SD-30 其它名稱:LP3905SD-30DKR
LTC3586EUFE-3#TRPBF 功能描述:IC USB POWER MANAGER HE 38-QFN RoHS:是 類(lèi)別:集成電路 (IC) >> PMIC - 電源管理 - 專用 系列:Bat-Track™, PowerPath™ 標(biāo)準(zhǔn)包裝:1 系列:- 應(yīng)用:手持/移動(dòng)設(shè)備 電流 - 電源:- 電源電壓:3 V ~ 5.5 V 工作溫度:-40°C ~ 85°C 安裝類(lèi)型:表面貼裝 封裝/外殼:14-WFDFN 裸露焊盤(pán) 供應(yīng)商設(shè)備封裝:14-LLP-EP（4x4） 包裝:Digi-Reel® 配用:LP3905SD-30EV-ND - BOARD EVALUATION LP3905SD-30 其它名稱:LP3905SD-30DKR
LTC3586EUFE-PBF 制造商:LINER 制造商全稱:Linear Technology 功能描述:High Effi ciency USB Power Manager with Boost, Buck-Boost and Dual Bucks
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