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参数资料
| 型号： | LTC3533EDE#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 14DFN |
| 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： | 1.8 V ~ 5.25 V |
| 输入电压： | 1.8 V ~ 5.5 V |
| PWM 型： | Burst Mode? |
| 频率 - 开关： | 300kHz ~ 2MHz |
| 电流 - 输出： | 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： | 14-WFDFN 裸露焊盘 |
| 包装： | 带卷 (TR) |
| 供应商设备封装： | 14-DFN-EP（4x3） |
LTC3533
APPLICATIONS INFORMATION
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.
Input Capacitor Selection
Since PV IN is the supply voltage for the IC it is recom-
mended to place at least a 4.7μF, low ESR ceramic bypass
capacitor close to PV IN and GND. It is also important to
minimize any stray resistance from the converter to the
battery or other power source.
Optional Schottky Diodes
Schottky diodes across the synchronous switches B and
D are not required, but do provide a lower drop during the
break-before-make time (typically 15ns), thus improving
ef?ciency. Use a surface mount Schottky diode such as an
MBRM120T3 or equivalent. Do not use ordinary recti?er
diodes since their slow recovery times will compromise
to provide the conduction path to the output. Note that
Burst Mode operation is inhibited at output voltages below
1V typical.
Output Voltage > 4.3V
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 parasitic lead and trace inductances.
Input Voltage > 4.5V
For applications with input voltages above 4.5V which
could exhibit an overload or short-circuit condition, a
2 Ω /1nF series snubber is required between SW1 and
GND. A Schottky diode from SW1 to PV 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 PV IN and GND
pins as possible is also required.
Operating Frequency Selection
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:
ef?ciency.
Output Voltage < 1.8V
Buck:
Boost:
I Q = (600e – 12 ? V IN ? f ) mA
I Q = [800e – 12 ? (V IN + V OUT ) ? f ] mA
The LTC3533 can operate as a buck converter with output
voltages as low as 400mV. The part is speci?ed at 1.8V
minimum to allow operation without the requirement of a
Schottky diode; Since synchronous switch D is powered
from PV OUT , and the R DS(ON) will increase at low output
voltages, a Schottky diode is required from SW2 to V OUT
Table 2. Capacitor Vendor Information
Buck/Boost: I Q = [(1400e – 12 ? V IN + 400e – 12 ?
V OUT ) ? f ] mA
where f = switching frequency in Hz. Therefore frequency
selection is a compromise between the optimal ef?ciency
and the smallest solution size.
SUPPLIER
AVX
Sanyo
Taiyo Yuden
TDK
PHONE
(803) 448-9411
(619) 661-6322
(408) 573-4150
(847) 803-6100
FAX
(803) 448-1943
(619) 661-1055
(408) 573-4159
(847) 803-6296
WEB SITE
www.avxcorp.com
www.sanyovideo.com
www.t-yuden.com
www.component.tdk.com
3533f
12
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LTC3534 | 制造商:LINER 制造商全称:Linear Technology 功能描述:40V, 2A Synchronous Buck-Boost DC/DC |
| LTC3534EDHC#PBF | 功能描述:IC REG BUCK BOOST SYNC ADJ 16DFN 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 |
| LTC3534EDHC#TRPBF | 功能描述:IC REG BUCK BOOST SYNC ADJ 16DFN 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 |
| LTC3534EGN#PBF | 功能描述:IC REG BUCK BST SYNC 0.5A 16SSOP 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 |
| LTC3534EGN#TRPBF | 功能描述:IC REG BUCK BST SYNC 0.5A 16SSOP 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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