参数资料
型号: LTC3535EDD#PBF
厂商: Linear Technology
文件页数: 12/16页
文件大小: 0K
描述: IC REG BST SYNC ADJ 0.55A 12DFN
特色产品: Energy Harvesting Power Products
标准包装: 121
类型: 升压(升压)
输出类型: 可调式
输出数: 2
输出电压: 1.5 V ~ 5.25 V
输入电压: 0.5 V ~ 5 V
PWM 型: 电流模式,混合
频率 - 开关: 1MHz
电流 - 输出: 550mA
同步整流器:
工作温度: -40°C ~ 85°C
安装类型: 表面贴装
封装/外壳: 12-WFDFN 裸露焊盘
包装: 管件
供应商设备封装: 12-DFN
产品目录页面: 1335 (CN2011-ZH PDF)
LTC3535
APPLICATIONS INFORMATION
COMPONENT SELECTION
Table 1. Recommended Inductor s
Inductor Selection
The LTC3535 can utilize small surface mount chip induc-
tors due to their fast 1MHz switching frequency. Inductor
values between 3.3μH and 6.8μH are suitable for most
applications. Larger values of inductance will allow slightly
greater output current capability (and lower the Burst
Mode threshold) by reducing the inductor ripple current.
Increasing the inductance above 10μH will increase com-
ponent size while providing little improvement in output
current capability.
The minimum inductance value is given by:
L > V IN(MIN) ? ( V OUT(MAX ) – V IN(MIN) )
Ripple ? V OUT ( M AX)
where:
Ripple = Allowable inductor current ripple (amps peak-
peak)
V IN(MIN) = Minimum input voltage
V OUT(MAX) = Maximum output voltage
VENDOR
Coilcraft
(847) 639-6400
www.coilcraft.com
Coiltronics
www.cooperet.com
FDK
(408) 432-8331
www.fdk.com
Murata
(714) 852-2001
www.murata.com
Sumida
(847) 956-0666
www.sumida.com
Taiyo-Yuden
www.t-yuden.com
TDK
(847) 803-6100
www.component.tdk.com
PART/STYLE
LPO4815
LPS4012, LPS4018
MSS5131
MSS4020
MOS6020
ME3220
DS1605, DO1608
SD10, SD12, SD14, SD18, SD20,
SD52, SD3114, SD3118
MIP3226D4R7M, MIP3226D3R3M
MIPF2520D4R7
MIPWT3226D3R0
LQH43C
LQH32C (-53 series)
301015
CDRH5D18
CDRH2D14
CDRH3D16
CDRH3D11
CR43
CMD4D06-4R7MC
CMD4D06-3R3MC
NP03SB
NR3015T
NR3012T
VLP
VLF, VLCF
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 ESR
(series resistance of the windings) to reduce the I 2 R power
losses, and must be able to support the peak inductor
current without saturating. Molded chokes and some chip
inductors usually do not have enough core area to support
the peak inductor current of 750mA seen on the LTC3535.
To minimize radiated noise, use a shielded inductor. See
Table 1 for suggested components and suppliers.
Toko D412C
(408) 432-8282 D518LC
www.tokoam.com D52LC
D62LCB
Wurth WE-TPC type S, M
(201) 785-8800
www.we-online.com
Output and Input Capacitor Selection
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
3535fa
12
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