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參數資料
| 型號： | LTC3127EDD#PBF |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | SWITCHING REGULATOR, PDSO10 |
| 封裝： | 3 X 3 MM, 0.75 MM HEIGHT, LEAD FREE, PLASTIC, MO-229WEED-2, DFN-10 |
| 文件頁數： | 20/20頁 |
| 文件大?。?/td> | 366K |
| 代理商： | LTC3127EDD#PBF |
LTC3127
3127f
The LTC3127 is an average input current controlled buck-
boostDC/DCconverterofferedinbothathermallyenhanced
3mm × 3mm DFN package and a thermally enhanced 12-
lead MSOP package. The buck-boost converter utilizes a
proprietary switching algorithm which allows its output
voltage to be regulated above, below or equal to the input
voltage. The low RDS(ON), low gate charge synchronous
switches efficiently provide high frequency PWM control.
High efficiency is achieved at light loads when Burst Mode
operation is commanded.
PWM Mode Operation
The LTC3127 uses fixed frequency, average input cur-
rent PWM control. The MODE pin can be used to select
automatic Burst Mode operation (MODE connected to
VIN) or to disable Burst Mode operation and select forced
continuousconductionoperationforlownoiseapplications
(MODE grounded).
A proprietary switching algorithm allows the converter
to switch between buck, buck-boost and boost modes
without discontinuity in inductor current or loop charac-
teristics.Theswitchtopologyforthebuck-boostconverter
is shown in Figure 1.
When the input voltage is significantly greater than the
output voltage, the buck-boost converter operates in
buck mode. Switch D turns on continuously and switch C
remains off. Switches A and B are pulse width modulated
to produce the required duty cycle to support the output
regulation voltage. As the input voltage decreases, switch
A remains on for a larger portion of the switching cycle.
When the duty cycle reaches approximately 85%, the
switch pair AC begins turning on for a small fraction of the
switching period. As the input voltage decreases further,
L
D
PGND
LTC3127
A
SW1
SW2
B
C
3127 F01
VOUT
VIN
Figure 1. Buck-Boost Switch Topology
the AC switch pair remains on for longer durations and
the duration of the BD phase decreases proportionally. As
the input voltage drops below the output voltage, the AC
phase will eventually increase to the point that there is no
longer any BD switching. At this point, switch A remains
on continuously while switch pair CD is pulse width modu-
lated to obtain the desired output voltage. At this point,
the converter is operating solely in boost mode.
This switching algorithm provides a seamless transition
between operating modes and eliminates discontinuities
in average inductor current, inductor current ripple, and
loop transfer function throughout all three operational
modes. These advantages result in increased efficiency
and stability in comparison to the traditional 4-switch
buck-boost converter. In forced PWM mode operation,
the inductor is forced to have continuous conduction.
This allows for a constant switching frequency and better
noise performance.
Error Amplifier and Compensation
The buck-boost converter utilizes two control loops. The
outer voltage loop determines the amount of current re-
quired to regulate the output voltage. The voltage loop is
externally compensated and can be configured with either
integral compensation or proportional control. The inner
currentloopisinternallycompensatedandforcestheinput
current to equal the commanded current.
When VC is compensated via proportional control, the
dominant pole of the output capacitor is used to ensure
stability with a minimum of 1000F of capacitance on the
output when a 499k resistor is used. There is no maximum
capacitance limitation with proportional compensation.
operaTion
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相關代理商/技術參數 |
參數描述 |
|---|---|
| LTC3127EDDTRPBF | 制造商:LINER 制造商全稱:Linear Technology 功能描述:1A Buck-Boost DC/DC Converter with Programmable Input Current Limit |
| LTC3127EMSE | 制造商:LINER 制造商全稱:Linear Technology 功能描述:1A Buck-Boost DC/DC Converter with Programmable Input Current Limit |
| LTC3127EMSE#PBF | 功能描述:IC BUCK BOOST SYNC ADJ 12MSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 電源管理 - 專用 系列:- 標準包裝:1 系列:- 應用:手持/移動設備 電流 - 電源:- 電源電壓:3 V ~ 5.5 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:14-WFDFN 裸露焊盤 供應商設備封裝:14-LLP-EP（4x4） 包裝:Digi-Reel® 配用:LP3905SD-30EV-ND - BOARD EVALUATION LP3905SD-30 其它名稱:LP3905SD-30DKR |
| LTC3127EMSE#PBF | 制造商:Linear Technology 功能描述:BUCK-BOOST DC/DC CONVERTER IC 制造商:Linear Technology 功能描述:IC, BUCK/BOOST DC/DC CONVERTER, MSOP-12 |
| LTC3127EMSE#TRPBF | 功能描述:IC DCDC CONV BUCK BOOST 12MSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 電源管理 - 專用 系列:- 標準包裝:1 系列:- 應用:手持/移動設備 電流 - 電源:- 電源電壓:3 V ~ 5.5 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:14-WFDFN 裸露焊盤 供應商設備封裝:14-LLP-EP（4x4） 包裝:Digi-Reel® 配用:LP3905SD-30EV-ND - BOARD EVALUATION LP3905SD-30 其它名稱:LP3905SD-30DKR |
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