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| 型号： | SP6669CEK-L/TRR3 |
| 厂商： | Exar Corporation |
| 文件页数： | 8/11页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK SYNC 1.5V SOT23-5 |
| 标准包装： | 3,000 |
| 类型： | 降压（降压） |
| 输出类型： | 固定 |
| 输出数： | 1 |
| 输出电压： | 1.5V |
| 输入电压： | 2.5 V ~ 5.5 V |
| PWM 型： | 电流模式 |
| 频率 - 开关： | 1.5MHz |
| 电流 - 输出： | 600mA |
| 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： | SC-74A，SOT-753 |
| 包装： | 带卷 (TR) |
| 供应商设备封装： | SOT-23-5 |
S P 6 6 6 9
6 0 0 m A 1 . 5 M H z S y n c h r o n o u s S t e p D o w n C o n v e r t e r
THEORY OF OPERATION
A PPLICATIONS
The ESR rating of the capacitor is an important
parameter to select C OUT . The output ripple
V OUT is determined by:
? V OUT ? ? I L ? ? ESR ?
? ?
The typical application circuit of the adjustable
output voltage option and the fixed output
voltage option are shown below.
Eq. 3:
?
?
1
8 ? f ? C OUT
?
?
Higher values, lower cost ceramic capacitors
are now available in smaller sizes. These
capacitors have high ripple currents, high
voltage ratings and low ESR that makes them
ideal for switching regulator applications. As
Fig. 22: Adjustable Output Voltage Version
C OUT does not affect the internal control loop
stability, its value can be optimized to balance
very low output ripple and circuit size. It is
recommended to use an X5R or X7R rated
capacitors which have the best temperature
and voltage characteristics of all the ceramics
for a given value and size.
O UTPUT V OLTAGE – A DJUSTABLE V ERSION
V OUT ? 0 . 6 V ? ? ? 1 ? 2 ? ?
Fig. 23: Fixed Output Voltage Version
I NDUCTOR S ELECTION
Inductor ripple current and core saturation are
The adjustable
determined by:
Eq. 4:
output voltage version
? R ?
? R 1 ?
is
V OUT ? ? 1 ? OUT
? ?
Eq. 1: ? I L ?
f ? L
V OUT ? V IN ? V OUT ?
two factors considered to select the inductor
value.
1 ? V ?
? V IN ?
Equation 1 shows the inductor ripple current
as a function of the frequency, inductance, V IN
and V OUT . It is recommended to set the ripple
current between 30% to 40% of the maximum
load current. A low ESR inductor is preferred.
C IN AND C OUT S ELECTION
A low ESR input capacitor can prevent large
voltage transients at V IN . The RMS current
rating of the input capacitor is required to be
larger than I RMS calculated by:
Eq. 2: I RMS ? I OMAX
V IN
T HERMAL C ONSIDERATIONS
Although the SP6669 has an on board over
temperature circuitry, the total power
dissipation it can support is based on the
package thermal capabilities. The formula to
ensure safe operation is given in note 1.
PCB L AYOUT
The following PCB layout guidelines should be
taken into account to ensure proper operation
and performance of the SP6669:
1- The GND, SW and V IN traces should be kept
short, direct and wide.
2- V FB pin must be connected directly to the
feedback resistors. The resistor divider
network must be connected in parallel to the
C OUT capacitor.
3- The input capacitor C IN must be kept as
close as possible to the V IN pin.
? 2012 Exar Corporation
8/11
Rev. 2.2.0
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相关代理商/技术参数 |
参数描述 |
|---|---|
| SP6669CEK-TRR3 | 制造商:EXAR 制造商全称:EXAR 功能描述:600mA 1.5MHz Synchronous Step Down Converter |
| SP6669DEK-L | 功能描述:直流/直流开关转换器 600mA 1.5MHz Step Down Switcher RoHS:否 制造商:STMicroelectronics 最大输入电压:4.5 V 开关频率:1.5 MHz 输出电压:4.6 V 输出电流:250 mA 输出端数量:2 最大工作温度:+ 85 C 安装风格:SMD/SMT |
| SP6669DEK-L/TR | 功能描述:开关变换器、稳压器与控制器 1.5MHz, 600mA Sync Step Down Converter RoHS:否 制造商:Texas Instruments 输出电压:1.2 V to 10 V 输出电流:300 mA 输出功率: 输入电压:3 V to 17 V 开关频率:1 MHz 工作温度范围: 安装风格:SMD/SMT 封装 / 箱体:WSON-8 封装:Reel |
| SP6669DEK-L/TRR3 | 功能描述:开关变换器、稳压器与控制器 DOWN CONVERTER RoHS:否 制造商:Texas Instruments 输出电压:1.2 V to 10 V 输出电流:300 mA 输出功率: 输入电压:3 V to 17 V 开关频率:1 MHz 工作温度范围: 安装风格:SMD/SMT 封装 / 箱体:WSON-8 封装:Reel |
| SP6669DEK-TRR3 | 制造商:EXAR 制造商全称:EXAR 功能描述:600mA 1.5MHz Synchronous Step Down Converter |
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