參數(shù)資料
型號(hào)： LTC3112EDHD#PBF
廠商： LINEAR TECHNOLOGY CORP
元件分類： 穩(wěn)壓器
英文描述： 12 A SWITCHING REGULATOR, 825 kHz SWITCHING FREQ-MAX, PDSO16
封裝： 5 X 4 MM, 0.75 MM HEIGHT, LEAD FREE, PLASTIC, MO-229WJGD-2, DFN-16
文件頁(yè)數(shù)： 6/32頁(yè)
文件大?。?/td> 651K
代理商： LTC3112EDHD#PBF
LTC3112
14
3112f
The basic LTC3112 application circuit is shown on the front
page of this data sheet. The external component selection
is dependent upon the required performance of the IC in
each particular application given trade-offs such as PCB
area, output voltages, output currents, ripple voltages
and efciency. This section of the data sheet provides
some basic guidelines and considerations to aid in the
selection of external components and the design of the
application circuit.
VOUT AND OVP PROGRAMMING
The buck-boost output voltage is set with an external
resistor divider connected to the FB pin as shown in
Figure 2.
The resistor divider values determine the buck-boost output
voltage according to the following formula:
APPLICATIONS INFORMATION
VOUT
2.5V < VOUT < 14V
R3
R4
R1
R2
C1
LTC3112
GND
OVP
FB
3112 F02
Figure 2. Setting the Output Voltage
VOUT = 0.8V 1+
R1
R2
If accurate overvoltage protection is required, a second
resistor divider (R3 and R4) may be connected to the OVP
pin to program the overvoltage protection threshold where
the LTC3112 will stop switching.
VOVP = 0.83V 1+
R3
R4
A small capacitor, C1, in parallel with R4 may be needed
to provide ltering to prevent nuisance trips during a load
step. A soft-start cycle will be initiated if an overvoltage
event occurs.
INDUCTOR SELECTION
To achieve high efciency, a low ESR inductor should be
utilized for the buck-boost converter. In addition, the buck-
boost inductor must have a saturation current rating that
is greater than the worst case average inductor current
plus half the ripple current. The peak-to-peak inductor
current ripple for buck or boost mode operation can be
calculated from the following formulas:
ΔIL,PP, BUCK=
VOUT
f
L
VIN VOUT
VIN
A
ΔIL,PP, BOOST=
VIN
f
L
VOUT VIN
VOUT
A
OPERATION
Burst Mode operation, the error amplier is congured for
low power operation and used to hold the compensation
pin COMP, to reduce transients that may occur during
transitions from and to burst and PWM mode.
OUTPUT CURRENT MONITOR
The LTC3112 includes a circuit that sources an approximate
24μA/A current replica of the VOUT (or SWD) current. This
current is typically passed through a resistor from IOUT
to GND and ltered to produce a DC voltage proportional
to average load current. This voltage can be monitored
by an A/D converter to track load conditions. The IOUT
pin voltage can also control LTC3112’s feedback loop to
regulate IOUT current instead of VOUT voltage. The accuracy
of the IOUT replica depends on factors such as duty cycle,
VIN and VOUT voltages, operating frequency etc. The IOUT
pin’s DC voltage must be less than VCC - 1V to provide an
accurate representation of output current.
相關(guān)PDF資料
PDF描述
LTC3112EDHD#TRPBF 12 A SWITCHING REGULATOR, 825 kHz SWITCHING FREQ-MAX, PDSO16
LTC3113EFE#PBF 16 A SWITCHING REGULATOR, 2000 kHz SWITCHING FREQ-MAX, PDSO20
LTC3113IDHD#TRPBF 16 A SWITCHING REGULATOR, 2000 kHz SWITCHING FREQ-MAX, PDSO16
LTC3113IFE#PBF 16 A SWITCHING REGULATOR, 2000 kHz SWITCHING FREQ-MAX, PDSO20
LTC3125EDCB#TRMPBF SWITCHING REGULATOR, 1900 kHz SWITCHING FREQ-MAX, PDSO8
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
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LTC3112EFE#TRPBF 功能描述:IC REG BUCK BST SYNC ADJ 20TSSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 開關(guān)穩(wěn)壓器 系列:- 設(shè)計(jì)資源:Design Support Tool 標(biāo)準(zhǔn)包裝:1 系列:- 類型:升壓（升壓） 輸出類型:固定 輸出數(shù):1 輸出電壓:3V 輸入電壓:0.75 V ~ 2 V PWM 型:- 頻率 - 開關(guān):- 電流 - 輸出:100mA 同步整流器:是 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:SOT-23-5 細(xì)型，TSOT-23-5 包裝:剪切帶 (CT) 供應(yīng)商設(shè)備封裝:TSOT-23-5 其它名稱:AS1323-BTTT-30CT
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LTC3112IDHD#PBF 功能描述:IC REG BUCK BST SYNC ADJ 16-DFN RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 開關(guān)穩(wěn)壓器 系列:- 設(shè)計(jì)資源:Design Support Tool 標(biāo)準(zhǔn)包裝:1 系列:- 類型:升壓（升壓） 輸出類型:固定 輸出數(shù):1 輸出電壓:3V 輸入電壓:0.75 V ~ 2 V PWM 型:- 頻率 - 開關(guān):- 電流 - 輸出:100mA 同步整流器:是 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:SOT-23-5 細(xì)型，TSOT-23-5 包裝:剪切帶 (CT) 供應(yīng)商設(shè)備封裝:TSOT-23-5 其它名稱:AS1323-BTTT-30CT
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