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参数资料
| 型号： | LTC3538EDCB#TRM |
| 厂商： | LINEAR TECHNOLOGY CORP |
| 元件分类： | 稳压器 |
| 英文描述： | 0.8 A SWITCHING REGULATOR, 1200 kHz SWITCHING FREQ-MAX, PDSO8 |
| 封装： | 2 X 3 MM, PLASTIC, DFN-8 |
| 文件页数： | 2/16页 |
| 文件大小： | 197K |
| 代理商： | LTC3538EDCB#TRM |
LTC3538
10
3538f
During the period when the LTC3538 is delivering energy
to the output, the peak inductor current will be equal to
800mA typical and the inductor current will terminate
each cycle at zero current. In Burst Mode operation the
maximum average output current that can be delivered
while maintaining output regulation is given by:
I
V
I
OUT BURST BOOST
IN
OUT
IN
O
_(
)
.
=
>
025
A;VOUT
U
UT BURST BUCK
IN
V
_(
)
.
=<
027A;VOUT
The maximum average Burst Mode output current that
can be delivered in the four-switch buck-boost region is
limited to the boost equation specied above.
INDUCTOR SELECTION
To achieve high efciency, a low ESR inductor should be
utilized for the converter. The inductor must have a satura-
tion rating greater than the worst case average inductor
current plus half the ripple current. The peak-to-peak cur-
rent ripple will be larger in buck and boost mode than in
the buck-boost region. The peak-to-peak inductor current
ripple for each mode can be calculated from the following
formulas, where f is the frequency (1MHz typical) and L
is the inductance in μH.
Δ
I
VV
fL
I
OUT
IN
OUT
IN
L,P-P,BUCK
L,P-P
A
=
()
–
/
,,BOOST
A
=
()
VV
V
fL
OUT
IN
OUT
–
/
where f = frequency (1MHz typical), Hz
L = inductor, H
OPERATION
In addition to affecting output current ripple, the size of the
inductor can also affect the stability of the feedback loop.
In boost mode, the converter transfer function has a right
half plane zero at a frequency that is inversely proportional
to the value of the inductor. As a result, a large inductor
can move this zero to a frequency low enough to degrade
the phase margin of the feedback loop. It is recommended
that the inductor value be chosen less than 10μH.
For high efciency, choose a ferrite inductor with a high
frequency core material to reduce core loses. The induc-
tor should have low ESR (equivalent series resistance) to
reduce the I2R losses, and must be able to handle the peak
inductor current without saturating. Molded chokes or chip
inductors usually do not have enough core to support the
peak inductor currents in the 1A to 2A region. To minimize
radiated noise, use a shielded inductor. See Table 1 for a
suggested list of inductor suppliers.
Output Capacitor Selection
The bulk value of the output lter capacitor is selected to
reduce the ripple due to charge into the capacitor each
cycle. The steady state ripple due to charge is given by:
ΔVP-P, BOOST = ILOAD (VOUT – VIN)/(COUT VOUT f)V
ΔVP-P,BUCK = (VIN – VOUT) VOUT/(8 L VIN COUT f2)V
where COUT = output lter capacitor, F
ILOAD = Output load current, A
SUPPLIER
PHONE
FAX
WEB SITE
Coilcraft
(847) 639-6400
(847) 639-1469
www.coilcraft.com
CoEv Magnetics
(800) 227-7040
(650) 361-2508
www.tycoelectronics.com
Murata
(814) 237-1431
(800) 831-9172
(814) 238-0490
www.murata.com
Sumida
USA: (847) 956-0666
Japan: 81 (3) 3607-5111
USA: (847) 956-0702
Japan: 81(3) 3607-5144
www.sumida.com
TDK
(847) 803-6100
(847) 803-6296
www.component.tdk.com
TOKO
(847) 297-0070
(847) 699-7864
www.tokoam.com
Table 1. Inductor Vendor Information
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LTC3538EDCB-TRPBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:800mA Synchronous Buck-Boost DC/DC Converter |
| LTC3539 | 制造商:LINER 制造商全称:Linear Technology 功能描述:400mA Step-Up DC/DC Converter with Maximum Power Point Control and 250mV Start-Up |
| LTC3539-2 | 制造商:LINER 制造商全称:Linear Technology 功能描述:400mA Step-Up DC/DC Converter with Maximum Power Point Control and 250mV Start-Up |
| LTC3539EDCB#PBF | 制造商:Linear Technology 功能描述: 制造商:Linear Technology 功能描述:DP-SWREG/Monolithic, Cut Tape 2A, 1MHz Synchronous Step-Up DC/DC Converter in 2m |
| LTC3539EDCB#TRMPBF | 功能描述:IC REG BOOST SYNC ADJ 2A 8DFN RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 标准包装:2,500 系列:- 类型:降压（降压） 输出类型:固定 输出数:1 输出电压:1.2V，1.5V，1.8V，2.5V 输入电压:2.7 V ~ 20 V PWM 型:- 频率 - 开关:- 电流 - 输出:50mA 同步整流器:是 工作温度:-40°C ~ 125°C 安装类型:表面贴装 封装/外壳:10-TFSOP，10-MSOP（0.118"，3.00mm 宽）裸露焊盘 包装:带卷 (TR) 供应商设备封装:10-MSOP 裸露焊盘 |
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