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| 型号： | LTC3532EMS#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 11/16页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK BST SYNC 0.5A 10MSOP |
| 标准包装： | 50 |
| 类型： | 降压（降压），升压（升压） |
| 输出类型： | 可调式 |
| 输出数： | 1 |
| 输出电压： | 2.4 V ~ 5.25 V |
| 输入电压： | 2.4 V ~ 5.5 V |
| PWM 型： | Burst Mode? |
| 频率 - 开关： | 300kHz ~ 2MHz |
| 电流 - 输出： | 500mA |
| 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： | 10-TFSOP，10-MSOP（0.118"，3.00mm 宽） |
| 包装： | 管件 |
| 供应商设备封装： | 10-MSOP |
| 产品目录页面： | 1335 (CN2011-ZH PDF) |
LTC3532
APPLICATIO S I FOR ATIO
1 R T
2 BURST
3 SW1
LTC3532
V C 10
FB 9
SHDN /SS 8
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.
Table 1. Inductor Vendor Information
4 SW2
5 GND
GND
V IN 7
V OUT 6
3532 F06
SUPPLIER
Coilcraft
Murata
Sumida
TDK
TOKO
WEB SITE
www.coilcraft.com
www.murata.com
www.sumida.com
www.component.tdk.com
www.tokoam.com
Figure 6. Recommended Component Placement. Traces Carrying
High Current are Direct. Trace area at FB and V C Pins are Kept
Low. Lead Length to Battery Should be Kept Short
Inductor Selection
The high frequency operation of the LTC3532 allows the
use of small surface mount inductors. The inductor ripple
Output Capacitor Selection
The bulk value of the output ?lter capacitor is set to reduce
the ripple due to charge into the capacitor each cycle. The
steady state ripple due to charge is given by:
% RIPPLE_BOOST =
current is typically set to 20% to 40% of the maximum
inductor current. For a given ripple the inductance terms
are given as follows:
I OUT(MAX) ? (V OUT – V IN(MIN) ) ? 100
C OUT ? V OUT 2 ? f
%
V IN(MIN) ? (V OUT – V IN(MIN) )
L BOOST >
f ? Δ I L ? V OUT
V OUT ? (V IN(MAX) – V OUT )
L BUCK > H
f ? Δ I L ? V IN(MAX)
H
% RIPPLE_BUCK =
1 (V IN(MAX) – V OUT ) ? 100%
?
8LCf 2 V IN(MAX)
where C OUT = output ?lter capacitor in Farads and
f = switching frequency in Hz.
where f = Operating frequency, Hz
ΔIL = Maximum allowable inductor ripple current, A
V IN(MIN) = Minimum input voltage
V IN(MAX) = Maximum input voltage
V OUT = Output voltage
I OUT(MAX) = Maximum output load current
For high ef?ciency, choose a ferrite inductor with a high
frequency core material to reduce core losses. 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
The output capacitance is usually many times larger than
the minimum value in order to handle the transient response
requirements of the converter. As a rule of thumb, the ratio
of the operating frequency to the unity-gain bandwidth of
the converter is the amount the output capacitance will
have to increase from the above calculations in order to
maintain the desired transient response.
The other component of ripple is due to the ESR (equiva-
lent series resistance) of the output capacitor. Low ESR
capacitors should be used to minimize output voltage
ripple. For surface mount applications, Taiyo Yuden or
TDK ceramic capacitors, AVX TPS series tantalum capaci-
tors or Sanyo POSCAP are recommended. See Table 2 for
contact information.
3532fc
11
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| LTC3533EDE#PBF | 功能描述:IC REG BUCK BOOST SYNC ADJ 14DFN 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:250 系列:- 类型:降压（降压） 输出类型:固定 输出数:1 输出电压:1.2V 输入电压:2.05 V ~ 6 V PWM 型:电压模式 频率 - 开关:2MHz 电流 - 输出:500mA 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:6-UFDFN 包装:带卷 (TR) 供应商设备封装:6-SON（1.45x1） 产品目录页面:1032 (CN2011-ZH PDF) 其它名称:296-25628-2 |
| LTC3533EDE#PBF | 制造商:Linear Technology 功能描述:DC/DC Converter IC |
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