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| 型号： | LTC3125EDCB#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 11/18页 |
| 文件大小： | 0K |
| 描述： | IC REG BOOST SYNC ADJ 1.2A 8DFN |
| 标准包装： | 2,500 |
| 类型： | 升压（升压） |
| 输出类型： | 可调式 |
| 输出数： | 1 |
| 输出电压： | 2 V ~ 5.25 V |
| 输入电压： | 1.8 V ~ 5.5 V |
| PWM 型： | 电流模式，混合 |
| 频率 - 开关： | 1.6MHz |
| 电流 - 输出： | 1.2A |
| 同步整流器： | 是 |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-WFDFN 裸露焊盘 |
| 包装： | 带卷 (TR) |
| 供应商设备封装： | 8-DFN（3x2） |
LTC3125
APPLICATIONS INFORMATION
power losses compared to cheaper powdered iron types,
improving ef?ciency. The inductor should have low DCR
(DC 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 currents of 1.8A seen on the LTC3125.
To minimize radiated noise, use a shielded inductor. See
Table 1 for suggested components and suppliers.
Table 1. Recommended Inductors
VENDOR PART/STYLE
Coilcraft LPO2506
(847) 639-6400 LPS4012, LPS4018
where I PULSE and t ON are the peak current and on time
during transmission burst and I STANDBY is the current in
standby mode. The above is a worst-case approximation
assuming all the pulsing energy comes from the output
capacitor.
The ripple due to the capacitor ESR is:
V RIPPLE_ESR = (I PULSE – I STANDBY ) ? ESR
Low ESR and high capacitance are critical to maintain low
output voltage ripple. Typically, two low pro?le 2200μF
parallel Vishay TANTAMOUNT ? tantalum, low ESR capaci-
tors are used. The capacitor has less than 40m Ω ESR.
These capacitors can be used in parallel for even larger
www.coilcraft.com
Coiltronics
www.cooperet.com
Murata
(714) 852-2001
www.murata.com
Sumida
(847) 956-0666
www.sumida
Taiyo-Yuden
www.t-yuden.com
TDK
(847) 803-6100
www.component.tdk.com
Wurth
MSS6122
MSS4020
MOS6020
DS1605, DO1608
SD52, SD53, SD3114, SD3118
LQH55D
CDH40D11
NP04SB
NR3015
NR4018
VLP, LTF
VLF, VLCF
WE-TPC Type S, M, MH, MS
capacitance values. For applications requiring very high
capacitance, the GS, GS2 and GW series from Cap-XX,
the BestCap TM series from AVX and PowerStor ? Aerogel
Capacitors from Cooper all offer very high capacitance and
low ESR in various package options. Table 2 shows a list
of several reservoir capacitor manufacturers.
Multilayer ceramic capacitors are an excellent choice for
input decoupling of the step-up converter as they have
extremely low ESR and are available in small footprints.
Input capacitors should be located as close as possible
to the device. While a 10μF input capacitor is suf?cient
for most applications, larger values may be used to re-
duce input current ripple without limitations. Consult the
manufacturers directly for detailed information on their
selection of ceramic capacitors. Although ceramic capaci-
(201) 785-8800
www.we-online.com
Output and Input Capacitor Selection
tors are recommended, low ESR tantalum capacitors may
be used as well.
Table 2. Capacitor Vendor Information
When selecting output capacitors for large pulsed loads,
the magnitude and duration of the pulsing current, together
with the ripple voltage speci?cation, determine the choice
of the output capacitor. Both the ESR of the capacitor and
the charge stored in the capacitor each cycle contribute
to the output voltage ripple. The ripple due to the charge
SUPPLIER
Vishay
AVX
Cooper Bussman
Cap-XX
Panasonic
PHONE
(402) 563-6866
(803) 448-9411
(516) 998-4100
(843) 267-0720
(800) 394-2112
WEBSITE
www.vishay.com
www.avxcorp.com
www.cooperbussman.com
www.cap-xx-com
www.panasonic.com
is approximately:
V RIPPLE (mV)=
( I PULSE –I STANDBY ) ?t ON
C OUT
3125fa
11
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