音影先锋亚洲天堂网|电影世界尽头的爱完整版播放|国产 熟女 91|高清无码免费观看欧美日韩|韩国一区二区三区黄色录像|美女亚洲加勒比在线|亚洲综合网 开心五月|7x成人在线入口|成人网站免费日韩毛片区|国产黄片?一级?二级?三级

LT3470ETS8 Datasheet

  • LT3470ETS8

  • Micropower Buck Regulator with Integrated Boost and Catch Di...

  • 16頁(yè)

  • Linear

掃碼查看芯片數(shù)據(jù)手冊(cè)

上傳產(chǎn)品規(guī)格書(shū)

PDF預(yù)覽

LT3470
APPLICATIO S I FOR ATIO
Ceramic Capacitors
Ceramic capacitors are small, robust and have very low
ESR. However, ceramic capacitors can cause problems
when used with the LT3470. Not all ceramic capacitors are
suitable. X5R and X7R types are stable over temperature
and applied voltage and give dependable service. Other
types, including Y5V and Z5U have very large temperature
and voltage coefficients of capacitance. In an application
circuit they may have only a small fraction of their nominal
capacitance resulting in much higher output voltage ripple
than expected.
Ceramic capacitors are piezoelectric. The LT3470鈥檚 switch-
ing frequency depends on the load current, and at light
loads the LT3470 can excite the ceramic capacitor at audio
frequencies, generating audible noise. Since the LT3470
operates at a lower current limit during BurstMode opera-
tion, the noise is typically very quiet to a casual ear. If this
audible noise is unacceptable, use a high performance
electrolytic capacitor at the output. The input capacitor can
be a parallel combination of a 2.2碌F ceramic capacitor and
a low cost electrolytic capacitor.
A final precaution regarding ceramic capacitors concerns
the maximum input voltage rating of the LT3470. A ce-
ramic input capacitor combined with trace or cable induc-
tance forms a high quality (under damped) tank circuit. If
the LT3470 circuit is plugged into a live supply, the input
voltage can ring to twice its nominal value, possibly
exceeding the LT3470鈥檚 rating. This situation is easily
avoided; see the Hot Plugging Safely section.
Table 3. Capacitor Vendors
Vendor
Panasonic
Phone
(714) 373-7366
URL
Kemet
Sanyo
(864) 963-6300
(408) 749-9714
Murata
AVX
Taiyo Yuden
(404) 436-1300
(864) 963-6300
10
U
BOOST and BIAS Pin Considerations
Capacitor C3 and the internal boost Schottky diode (see
Block Diagram) are used to generate a boost voltage that
is higher than the input voltage. In most cases a 0.22碌F
capacitor will work well. Figure 2 shows two ways to
arrange the boost circuit. The BOOST pin must be more
than 2.5V above the SW pin for best efficiency. For outputs
of 3.3V and above, the standard circuit (Figure 2a) is best.
For outputs between 2.5V and 3V, use a 0.47碌F. For lower
output voltages the boost diode can be tied to the input
V
IN
C3
0.22碌F
5
7
3
V
IN
LT3470
SW
BIAS
GND
4
V
BOOST
鈥?VSW
鈮?/div>
V
OUT
MAX V
BOOST
鈮?/div>
V
IN
+ V
OUT
6
BOOST
V
OUT
W
U U
(2a)
V
IN
3
V
IN
7
BIAS
GND
4
V
BOOST
鈥?VSW
鈮?/div>
V
IN
MAX V
BOOST
鈮?/div>
2V
IN
3470 F02
6
BOOST
SW
5
C3
0.22碌F
LT3470
V
OUT
(2b)
Figure 2. Two Circuits for Generating the Boost Voltage
Part Series
Ceramic,
Polymer,
Tantalum
Ceramic,
Tantalum
Ceramic,
Polymer,
Tantalum
Ceramic
Ceramic,
Tantalum
Ceramic
Comments
EEF Series
www.panasonic.com
www.kemet.com
www.sanyovideo.com
T494, T495
POSCAP
www.murata.com
www.avxcorp.com
www.taiyo-yuden.com
TPS Series
3470f

LT3470ETS8 PDF文件相關(guān)型號(hào)

LT3472EDD,LT3473,LT3473A

LT3470ETS8相關(guān)型號(hào)PDF文件下載

  • 型號(hào)
    版本
    描述
    廠商
    下載
  • 英文版
    Seoul Semiconductor [BLUE OVAL LAMP LED]
    SEOUL
  • 英文版
    Dual Synchronous,400mA/800mA, 2.25MHz Step-Down DC/DC Regula...
    LINER
  • 英文版
    Dual Synchronous,400mA/800mA, 2.25MHz Step-Down DC/DC Regula...
    LINER [Lin...
  • 英文版
    Optoelectronic
    ETC
  • 英文版
    Photoflash Capacitor Chargers with Automatic Refresh
    LINER
  • 英文版
    Photoflash Capacitor Chargers with Automatic Refresh
    LINER [Lin...
  • 英文版
    Optoelectronic
    ETC
  • 英文版
    Optoelectronic
    ETC
  • 英文版
    5A, 8MHz, 4-Phase Synchronous Step-Up DC/DC Converter
    Linear
  • 英文版
    Optoelectronic
    ETC
  • 英文版
    High Voltage, 3A, 200kHz Step-Down Switching Regulator
    LINER
  • 英文版
    High Voltage, 3A,200kHz/100kHz Step-Down Switching Regulator...
    LINER [Lin...
  • 英文版
    1.4A, 500kHz Step-Down Switching Regulator
    LINER [Lin...
  • 英文版
    High Efficiency, Synchronous, 4-Switch Buck-Boost Controller
    LINER [Lin...
  • 英文版
    High Voltage, 3A, 200kHz Step-Down Switching Regulator
    LINER [Lin...
  • 英文版
    High Voltage, Current Mode Switching Regulator Controller
    LINER [Lin...
  • 英文版
    1.4A, 500kHz Step-Down Switching Regulator
    LINER
  • 英文版
    1.4A, 500kHz Step-Down Switching Regulator
    LINER [Lin...
  • 英文版
    High Efficiency, Synchronous, 4-Switch Buck-Boost Controller
    LINER [Lin...
  • 英文版
    High Voltage, Current Mode Switching Regulator Controller
    LINER [Lin...

掃碼下載APP，
一鍵連接廣大的電子世界。

在線人工客服

買(mǎi)家服務(wù)：
賣(mài)家服務(wù)：
技術(shù)客服：

0571-85317607

網(wǎng)站技術(shù)支持

13606545031

客服在線時(shí)間周一至周五
9:00-17:30

關(guān)注官方微信號(hào)，
第一時(shí)間獲取資訊。

建議反饋

聯(lián)系人：

聯(lián)系方式：

按住滑塊，拖拽到最右邊
>>
感謝您向阿庫(kù)提出的寶貴意見(jiàn)，您的參與是維庫(kù)提升服務(wù)的動(dòng)力！意見(jiàn)一經(jīng)采納，將有感恩紅包奉上哦！