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| 型号： | LTC3532EDD#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 12/16页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK BOOST SYNC ADJ 10DFN |
| 标准包装： | 2,500 |
| 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-WFDFN 裸露焊盘 |
| 包装： | 带卷 (TR) |
| 供应商设备封装： | 10-DFN（3x3） |
LTC3532
APPLICATIO S I FOR ATIO
Table 2. Capacitor Vendor Information
Operating Frequency Selection
SUPPLIER
AVX
Murata
Sanyo
Taiyo Yuden
TDK
WEB SITE
www.avxcorp.com
www.murata.com
www.sanyovideo.com
www.t-yuden.com
www.component.tdk.com
Higher operating frequencies allow the use of a smaller
inductor and smaller input and output ?lter capacitors,
thus reducing board area and component height. How-
ever, higher operating frequencies also increase the IC’s
total quiescent current due to the gate charge of the four
switches, as given by:
Input Capacitor Selection
Since V IN is the supply voltage for the IC, as well as the
input to the power stage of the converter, it is recommended
to place at least a 4.7μF, low ESR ceramic bypass capaci-
tor close to the V IN and GND pins. It is also important to
minimize any stray resistance from the converter to the
battery or other power source.
Optional Schottky Diodes
The Schottky diodes across the synchronous switches
B and D are not required (V OUT < 4.3V), but provide a
lower drop during the break-before-make time (typically
15ns) improving ef?ciency. Use a surface mount Schottky
Buck: I Q = (0.125 ? V IN ? f) mA
Boost: I Q = [0.06 ? (V IN + V OUT ) ? f] mA
Buck/Boost: I Q = [f ? (0.19 ? V IN + 0.06 ? V OUT )] mA
where f = switching frequency in MHz. Therefore frequency
selection is a compromise between the optimal ef?ciency
and the smallest solution size.
Closing the Feedback Loop
The LTC3532 incorporates voltage mode PWM control.
The control to output gain varies with operation region
(buck, boost, buck/boost), but is usually no greater than
15. The output ?lter exhibits a double pole response, as
given by:
diode such as an MBRM120T3 or equivalent. Do not use
ordinary recti?er diodes, since the slow recovery times
will compromise ef?ciency. For applications with an
f FILTER — POLE =
1
2 ? π ? L ? C OUT
Hz
output voltage above 4.3V, a Schottky diode is required
from SW2 to V OUT .
Output Voltage > 4.3V
(in buck mode)
f FILTER — POLE =
V IN
2 ? V OUT ? π ? L ? C OUT
Hz
A Schottky diode from SW2 to V OUT is required for output
voltages over 4.3V. The diode must be located as close to
the pins as possible in order to reduce the peak voltage on
SW2 due to the parasitic lead and trace inductance.
(in boost mode)
where L is in henrys and C OUT is in farads.
The output ?lter zero is given by:
Input Voltage > 4.5V
For applications with input voltages above 4.5V which
f FILTER — ZERO =
1
2 ? π ? R ESR ? C OUT
Hz
V IN2
could exhibit an overload or short-circuit condition, a
2Ω/1nF series snubber is required between SW1 and
GND. A Schottky diode from SW1 to V IN should also be
added as close to the pins as possible. For the higher input
voltages, V IN bypassing becomes more critical; therefore,
a ceramic bypass capacitor as close to the V IN and SGND
pins as possible is also required.
where R ESR is the equivalent series resistance of the
output capacitor.
A troublesome feature in boost mode is the right-half plane
zero (RHP), given by:
f RHPZ = Hz
2 ? π ? I OUT ? L ? V OUT
3532fc
12
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LTC3532EMS | 制造商:Linear Technology 功能描述:Conv DC-DC Single Non-Inv/Inv/Step Up/Step Down 2.4V to 5.5V 10-Pin MSOP |
| LTC3532EMS#PBF | 功能描述:IC REG BUCK BST SYNC 0.5A 10MSOP 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 |
| LTC3532EMS#TR | 制造商:Linear Technology 功能描述:Conv DC-DC Single Non-Inv/Inv/Step Up/Step Down 2.4V to 5.5V 10-Pin MSOP T/R |
| LTC3532EMS#TRPBF | 功能描述:IC REG BUCK BST SYNC 0.5A 10MSOP 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:升压（升压） 输出类型:可调式 输出数:1 输出电压:1.24 V ~ 30 V 输入电压:1.5 V ~ 12 V PWM 型:电流模式，混合 频率 - 开关:600kHz 电流 - 输出:500mA 同步整流器:无 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:8-SOIC（0.154"，3.90mm 宽） 包装:带卷 (TR) 供应商设备封装:8-SOIC |
| LTC3532EMS-PBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:Micropower Synchronous Buck-Boost DC/DC Converter |
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