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参数资料
| 型号： | SP6654ER-L/TR |
| 厂商： | Exar Corporation |
| 文件页数： | 11/17页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK SYNC ADJ 0.8A 10DFN |
| 标准包装： | 3,000 |
| 类型： | 降压（降压） |
| 输出类型： | 可调式 |
| 输出数： | 1 |
| 输出电压： | 1 V ~ 5.5 V |
| 输入电压： | 2.7 V ~ 5.5 V |
| 电流 - 输出： | 800mA |
| 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-VFDFN 裸露焊盘 |
| 包装： | 带卷 (TR) |
| 供应商设备封装： | 10-DFN（3x3） |
OPERATION: Continued
inductor current reversal. This circuit along
with the on-timer puts the converter into PFM
mode and improves light load efficiency when
the load current is less than half the inductor
ripple current defined by K ON /L.
Shutdown/Enable Control
The D0, D1 pins 4,5 of the device are logic level
control pins that according to Table 1 shut down
the converter when both are a logic low, or
enables the converter when either are a logic
high. When the converter is shut down, the
current to ground. Tying a resistor from pin 3 to
V IN or V OUT creates a logic level power good
indicator. PWR GD is forced low when in UVLO.
External Feedback Pin
The FB pin 6 is compared to an internal refer-
ence voltage of 0.8V to regulate the SP6654
output. The output voltage can be externally
programmed within the range +1.0V to +5.0V
by tying a resistor from FB to ground and FB to
V OUT (pin7). See the applications section for
resistor selection information.
power switches are opened and all circuit bias-
ing is extinguished leaving only junction leak-
age currents on supply pins 1 and 2. After pins
4 or 5 are brought high to enable the converter,
there is a turn on delay to allow the regulator
circuitry to reestablish itself. Power conversion
begins with the assertion of the internal refer-
ence ready signal which occurs approximately
150 μ s after the enable signal is received.
Power Good Indicator
A power good indicator looks at the voltage on
the feedback node. When this voltage is below
0.75V, the open drain NMOS on pin 3 sinks
APPLICATION INFORMATION
Inductor Current Ripple, I LR ≈ ON
Inductor Selection
The SP6654 uses a specially adapted minimum
on-time control of regulation utilizing a preci-
sion comparator and bandgap reference. This
adaptive minimum on-time control has the ad-
vantage of setting a constant current ripple for a
given inductor size. From the operations section
it has been shown:
K
L
For the typical SP6654 application circuit with
inductor size of 10 μ H, and K ON of 2V* μ sec, the
SP6654 current ripple would be about 200mA, and
would be fairly constant for different input and
output voltages, simplifying the selection of com-
ponents for the SP6654 power circuit. Other
inductor values could be selected, as shown in
Table 2 Components Selection. Using a larger
value than 10 μ H in an attempt to reduce output
voltage ripple would reduce inductor current ripple
and may not produce as stable an output ripple.
For larger inductors with the SP6654, which has
a peak inductor current of 1.25A, most 15 μ H or
22 μ H inductors would have to be larger physi-
cal sizes, limiting their use in small portable
applications. Smaller values like 6.8 μ H would
more easily meet the 1.25A limit and come in
small case sizes, and the increased inductor
Date: 2/1/05
SP6654 High Efficiency 800mA Synchronous Buck Regulator
11
? Copyright 2005 Sipex Corporation
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相关代理商/技术参数 |
参数描述 |
|---|---|
| SP6654EU | 制造商:Rochester Electronics LLC 功能描述: 制造商:Exar Corporation 功能描述: |
| SP6654EU/TR | 制造商:SIPEX 制造商全称:Sipex Corporation 功能描述:High Efficiency 800mA Synchronous Buck Regulator |
| SP6654EU-L | 功能描述:DC/DC 开关控制器 High Eff 800mA Synchronous RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK |
| SP6654EU-L/TR | 功能描述:DC/DC 开关控制器 High Eff 800mA Synchronous RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK |
| SP6655 | 制造商:SIPEX 制造商全称:Sipex Corporation 功能描述:High Efficiency 400mA Synchronous Buck Regulator Ideal for portable designs powered with Li Ion battery |
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