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参数资料
| 型号： | SI9140CQ-T1-E3 |
| 厂商： | Vishay Siliconix |
| 文件页数： | 12/19页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BUCK PWM 16-TSSOP |
| 标准包装： | 3,000 |
| 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-TSSOP（0.173"，4.40mm 宽） |
| 包装： | 带卷 (TR) |
Si9140
Vishay Siliconix
Product is End of Life 3/2014
TABLE 1.
FEEDBACK NETWORK COMPONENT VALUES
plies with the ± 5 % regulation requirement. If additional mar-
gin is desired, an external precision reference can be used in
place of the internal 1.5 V reference.
Total Output and
Decoupling Capacitance
3 x 330 μF a ...................Os-con
6 x 100 μF b ...................Tantalum
25 x 1 μF b .....................Ceramic
2 x 330 μF a ...................Os-con
4 x 100 μF b ...................Tantalum
C4
5.6 pF
10 pF
C5
180 pF
220 pF
R5
240 k
200k
Switching and Synchronous Rectification MOSFETs
The synchronous gate drive outputs of Si9140 PWM control-
ler drive the high-side P-Channel switch MOSFET and the
low-side N-Channel synchronous rectifier MOSFET. The
physical difference between the non-synchronous to syn-
25 x 1 μF b .....................Ceramic
3 x 330 μF a ...................Tantalum
chronous rectification requires an additional MOSFET
across the free-wheeling diode (D1). The inductor current will
25 x 1 μF .....................Ceramic.
4 x 100 μF b ...................Tantalum
b
Notes:
a. Power supply output capacitance.
b. μprocessor decoupling capacitance.
10 pF
100 pF
100 k
reach 0 A if the peak-to-peak inductor current equals twice
the output current. In synchronous rectification mode, current
is allowed to flow backwards from the inductor (L1) through
the synchronous MOSFET (Q3) and to the output capacitor
(C2) once the current reaches 0 A. Refer to schematic on
Figure 1. In non-synchronous rectification, the diode (D1)
Figure 7 is the measured transient response (time domain)
for the 10 A step response. The measured transient
response shows the processor voltage regulating to 70 mV,
well within the 0.145 V regulation.
The Si9140’s switching frequency is determined by the exter-
nal R OSC and C OSC values, allowing designers to set the
switching frequency of their choice. For applications where
space is the main constraint, the switching frequency can be
set as high as 2 MHz to minimize inductor and output capac-
itor size. In applications where efficiency is the main concern,
the switching frequency can be set low to maximize battery
life. The switching frequency for high-performance proces-
sors applications circuits are set for 400 kHz. The equation
for switching frequency is:
prevents the current from flowing in the reverse direction.
This minor difference has a drastic affect on the performance
of a power supply. By allowing the current to flow in the
reverse direction, it preserves the continuous inductor cur-
rent mode, maintaining the wide converter bandwidth and
improving efficiency. Also, maintaining the continuous cur-
rent mode during light load to full load guarantees consistent
transient response throughout a wide range of load condi-
tions.
The transition from stop clock and auto halt to active mode is
a perfect example. The microprocessor current can vary
from 0.5 A to 10 A or greater during these transitions. If the
converter were to operate in discontinuous current mode
during the stop clock and auto halt modes, the transfer func-
tion of the converter would be different compared to opera-
f OSC
0.75
R OSC x C OSC
(at V DD = 5.0 V)
tion in the active mode. In discontinuous current mode, the
converter bandwidth can be 10 to 15 times lower than the
continuous current mode (Figure 8). Therefore, the response
The precision reference is set at 1.5 V ± 1.5 %. The reference
is capable of sourcing up to 1 mA. The combination of 1.5 %
reference and 3.5 % transient load regulation safely com-
mP
Voltage
2.9 V
mP
Current
10 A
5A
0A
a) Transient Response from 0 to 10 A Step Load
www.vishay.com
12
time will also be 10 to 15 times slower, violating the micropro-
cessor’s regulator requirements. This could result in unreli-
able operation of the microprocessor.
b) Transient Response from 10 to 0 A Step Load
Figure 7.
Document Number: 70026
S-40699-Rev. H, 19-Apr-04
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相关代理商/技术参数 |
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|---|---|
| SI9140CY | 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 |
| SI9140CY-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 |
| SI9140CY-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 |
| SI9140CY-T1-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 |
| SI9140DQ | 制造商:VISHAY 制造商全称:Vishay Siliconix 功能描述:SMP Controller For High Performance Process Power Supplies |
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