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參數(shù)資料
| 型號(hào)： | LTC3100EUD#TRPBF |
| 廠商： | Linear Technology |
| 文件頁(yè)數(shù)： | 18/26頁(yè) |
| 文件大?。?/td> | 403K |
| 描述： | IC REG BUCK/BOOST/LINEAR 16-QFN |
| 產(chǎn)品培訓(xùn)模塊： | More Information on LDOs |
| 標(biāo)準(zhǔn)包裝： | 2,500 |
| 拓?fù)洌?/td> | 降壓（降壓）（1），升壓（升壓）（1），線(xiàn)性（LDO）（1） |
| 功能： | 任何功能 |
| 輸出數(shù)： | 3 |
| 頻率 - 開(kāi)關(guān)： | 1.5MHz |
| 電壓/電流 - 輸出 1： | 0.6 V ~ 5.5 V，250mA |
| 電壓/電流 - 輸出 2： | 1.5 V ~ 5.25 V，700mA |
| 電壓/電流 - 輸出 3： | 0.6 V ~ 5.25 V，100mA |
| 帶 LED 驅(qū)動(dòng)器： | 無(wú) |
| 帶監(jiān)控器： | 無(wú) |
| 帶序列發(fā)生器： | 是 |
| 電源電壓： | 0.5 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： | 16-WFQFN 裸露焊盤(pán) |
| 供應(yīng)商設(shè)備封裝： | 16-QFN-EP（3x3） |
| 包裝： | 帶卷 (TR) |
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LTC3100
18
3100fb
For more information www.linear.com/LTC3100
APPLICATIONS INFORMATION
COMPONENT SELECTION
Boost Output Voltage Programming
The boost output voltage is set by a resistive divider ac-
cording to the following formula:
V
OUT
=1.200V" 1+
R2
R1
?/DIV>
?/DIV>
?/DIV>
?/DIV>
?/DIV>
?/DIV>
The external divider is connected to the output as shown
in the Block Diagram. A feedforward capacitor may be
placed in parallel with resistor R2 to improve the noise
immunity of the feedback node, improve transient response
and reduce output ripple in Burst Mode operation. A value
of 33pF will generally suffice.
Boost Inductor Selection
The LTC3100 boost converter can utilize small surface
mount and chip inductors due to the fast 1.5MHz switching
frequency. Inductor values between 2.2礖 and 4.7礖 are
suitable for most applications. Larger values of induc-
tance will allow slightly greater output current capability
by reducing the inductor ripple current. Increasing the
inductance above 10礖 will increase size while providing
little improvement in output current capability.
The minimum boost inductance value is given by:
L>
V
IN(MIN)
" V
OUT(MAX)
V
IN(MIN)
(
)
1.5"RIPPLE"V
OUT(MAX)
Where:
RIPPLE = Allowable Inductor Current Ripple (Amps Peak-
to-Peak)
V
IN(MIN)
= Minimum Input Voltage
V
OUT(MAX)
= Maximum Output Voltage
The inductor current ripple is typically set for 20% to
40% of the maximum inductor current. High frequency
ferrite core inductor materials reduce frequency dependent
power losses compared to cheaper powdered iron types,
improving efficiency. The inductor should have low DCR
(series resistance of the winding) to reduce the I
2
R power
losses, and must not saturate at peak inductor current
levels. Molded chokes and some chip inductors usually
do not have enough core area to support the peak induc-
tor currents of 800mA seen on the LTC3100. To minimize
radiated noise, use a shielded inductor. See Table 1 for
suggested components and suppliers.
Table 1. Recommended Boost Inductors
VENDOR
PART/STYLE
Coilcraft
(847) 639-6400
www.coilcraft.com
LPS4012, LPS4018
MSS4020, MSS5131
Coiltronics
SD14, SD3814, SD3118
FDK
MIPSA2520
MIPW3226
Murata
www.murata.com
LQH43C
Sumida
(847) 956-0666
www.sumida.com
CDRH2D18, CDRH2D16
CDRH3D14, CDRH3D16
CDRH4D14, CDRH4D16
Taiyo-Yuden
www.t-yuden.com
NR3015
NP03SB
TDK
www.tdk.com
VLP
VLF, VLCF
Toko
(408) 432-8282
www.tokoam.com
D518LC
D52LC
DP418C
W黵th
(201) 785-8800
www.we-online.com
WE-TPC Type S, M
Boost Input and Output Capacitor Selection
The internal loop compensation of the LTC3100 boost con-
verter is designed to be stable with output capacitor values
of 4.7礔 or greater. Low ESR (equivalent series resistance)
capacitors should be used to minimize the output voltage
ripple. Multilayer ceramic capacitors are an excellent choice
as they have extremely low ESR and are available in small
footprints. A 4.7礔 to 10礔 output capacitor is sufficient
for most fixed frequency applications. For applications
where Burst Mode operation is enabled, a minimum value
of 20礔 is recommended. Larger values may be used to
obtain very low output ripple and to improve transient
response. X5R and X7R dielectric materials are preferred
for their ability to maintain capacitance over wide voltage
and temperature ranges. Y5V types should not be used.
Case sizes smaller than 0805 are not recommended due
to their increased DC bias effect.
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