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参数资料
| 型号： | SI9140CY-T1-E3 |
| 厂商： | Vishay Siliconix |
| 文件页数： | 15/19页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BUCK PWM 16-SOIC |
| 标准包装： | 2,500 |
| PWM 型： | 电流/电压模式 |
| 输出数： | 1 |
| 频率 - 最大： | 2MHz |
| 电源电压： | 3 V ~ 6.5 V |
| 降压： | 是 |
| 升压： | 无 |
| 回扫： | 无 |
| 反相： | 无 |
| 倍增器： | 无 |
| 除法器： | 无 |
| Cuk： | 无 |
| 隔离： | 无 |
| 工作温度： | 0°C ~ 70°C |
| 封装/外壳： | 16-SOIC（0.154"，3.90mm 宽） |
| 包装： | 带卷 (TR) |
Product is End of Life 3/2014
Si9140
Vishay Siliconix
Output Capacitor
L
V IN
x
V O2
I x f OSC
To regulate the microprocessor’s input voltage within
145 mV during 10 A load transients, a large output capaci-
Δ l = desired output current ripple. Typically Δ I = 25 % of max-
imum output current.
Finally, the time required to ramp up the current in the induc-
tor can be reduced with smaller inductance. A quick
response from the power supply relaxes the decoupling
capacitance required at the microprocessor, reducing the
overall solution cost and size.
Input Capacitor
The input capacitor’s function is to filter the raw power and
serve as the local power source to eliminate power-up and
transient surge failures. The type and characteristics of input
capacitors are determined by the input power and induc-
tance of the step-down converter. The ripple current handling
requirement usually dominates the selection criteria. The
capacitance required to maintain regulation will automatically
be achieved once it meets the ripple current requirement.
The following equation calculates the ripple current of the
input capacitor:
tance with low ESR is required. The output capacitor of the
power supply and decoupling capacitors at the microproces-
sor must hold up the processor voltage until the power supply
responds to the change. Even with fastest known switching
solution, it still takes three 330 μF OS-CON capacitors to
handle the load transient. If it weren’t for the 10 A load tran-
sient, the output capacitor would not need a low ESR value.
The fundamental output ripple current in a continuous step-
down converter is much lower than the input ripple current.
Maintaining voltage regulation during transients requires an
ESR in the range of 30 m Ω . For microprocessors with lower
transient requirements, the number of output and decoupling
capacitors can be reduced. The lower transient requirements
also allows greater consideration for Tantalum or Nichicon
PL series capacitors.
Conclusion
The Si9140 synchronous Buck controller’s ability to switch
up to 1 MHz combined with a 25 MHz error amplifier provides
the best solution in powering high- performance micropro-
cessors. The high switching frequency reduces inductor size
without compromising output ripple voltage. The wide con-
I RIPPLE
I RMSSW 2 - I IN2
verter bandwidth generated with the help of a 25 MHz error
amplifier reduces the amount of decoupling capacitors
An aluminum-electrolytic capacitor from Sanyo (OS-CON),
AVX (TPS Tantalum), or Nichicon (PL series) should be used
in high-power (30 W) applications to handle the ripple cur-
rent. The Sanyo capacitor is smaller and handles higher rip-
ple current than Nichicon, but at higher cost than the
Nichicon product. The AVX Tantalum capacitor has the best
capacitance and current handling capability per volume ratio,
but it takes extra surface area compared to OS-CON or PL
series. The TPS capacitors, lead time and cost have
increased drastically in the recent past due to high demand,
causing designers to shy away from the TPS Tantalum
capacitors. Nichicon capacitors can be used to provide an
economical solution if space is available or a large bulk
capacitance is already present on the input line. The number
required to handle the extreme transient requirement. The
Si9140’s synchronous fixed-frequency operation eliminates
the pulse skipping mode that generates random unpredict-
able EMI/EMC problems in desktop and notebook comput-
ers. The synchronous rectification also allows the converter
to operate in continuous current mode, independent of out-
put load current. This preserves the wide closed-loop con-
verter bandwidth required to meet the transient demand of
the microprocessor as it transitions from stop clock and auto
halt to active mode. The synchronous rectification improves
the efficiency of the converter by substituting the much
smaller I 2 R MOSFET loss for the VI diode loss. The need for
heatsinking is eliminated by using low r DS(on) TrenchFETs
(Si4410DY and Si4435DY).
of Sanyo (OS-CON) input capacitors required to handle var-
ious output currents are specified in Table 2.
Vishay Siliconix maintains worldwide manufacturing capability. Products may be manufactured at one of several qualified locations. Reliability data for Silicon Tech-
nology and Package Reliability represent a composite of all qualified locations. For related documents such as package/tape drawings, part marking, and reliability
data, see http://www.vishay.com/ppg?70026 .
Document Number: 70026
S-40699-Rev. H, 19-Apr-04
www.vishay.com
15
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| SI9140DQ | 制造商:VISHAY 制造商全称:Vishay Siliconix 功能描述:SMP Controller For High Performance Process Power Supplies |
| SI9140DQ-T1 | 功能描述:电压模式 PWM 控制器 Switching Power Supply Controller RoHS:否 制造商:Texas Instruments 输出端数量:1 拓扑结构:Buck 输出电压:34 V 输出电流: 开关频率: 工作电源电压:4.5 V to 5.5 V 电源电流:600 uA 最大工作温度:+ 125 C 最小工作温度:- 40 C 封装 / 箱体:WSON-8 封装:Reel |
| SI9140DQ-T1-E3 | 功能描述:电压模式 PWM 控制器 SMP CONTROLLER RoHS:否 制造商:Texas Instruments 输出端数量:1 拓扑结构:Buck 输出电压:34 V 输出电流: 开关频率: 工作电源电压:4.5 V to 5.5 V 电源电流:600 uA 最大工作温度:+ 125 C 最小工作温度:- 40 C 封装 / 箱体:WSON-8 封装:Reel |
| SI9140DY | 功能描述:电压模式 PWM 控制器 SMP Controller RoHS:否 制造商:Texas Instruments 输出端数量:1 拓扑结构:Buck 输出电压:34 V 输出电流: 开关频率: 工作电源电压:4.5 V to 5.5 V 电源电流:600 uA 最大工作温度:+ 125 C 最小工作温度:- 40 C 封装 / 箱体:WSON-8 封装:Reel |
| SI9140DY-E3 | 功能描述:电压模式 PWM 控制器 Switching Power Supply Controller RoHS:否 制造商:Texas Instruments 输出端数量:1 拓扑结构:Buck 输出电压:34 V 输出电流: 开关频率: 工作电源电压:4.5 V to 5.5 V 电源电流:600 uA 最大工作温度:+ 125 C 最小工作温度:- 40 C 封装 / 箱体:WSON-8 封装:Reel |
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