参数资料
| 型号： | SP6669DEK-L/TRR3 |
| 厂商： | Exar Corporation |
| 文件页数： | 9/11页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK SYNC 1.8V 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： | 1.8V |
| 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
V OUT ? ? 1 ? OUT
? ?
L ?
4- The SW and VFB nodes should be kept as
separate as possible to minize possible effects
from the high frequency and voltage swings of
the SW node.
5- The ground plates of C IN and C OUT should be
kept as close as possible.
O UPTUT V OLTAGE R IPPLE FOR V IN CLOSE TO
V OUT
When the input voltage V IN is close to the
output voltage V OUT , the SP6669 transitions
smoothly from the switching PWM converter
mode into a LDO mode. The following diagram
shows the output voltage ripple versus the
input voltage for a 3.3V output setting and a
200mA current load.
D ESIGN E XAMPLE
In a single Lithium-Ion battery powered
application, the V IN range is about 2.7V to
4.2V. The desired output voltage is 1.8V.
The inductor value needed can be calculated
using the following equation
1 ? V ?
f ? ? I L ? V IN ?
Substituting V OUT =1.8V, V IN =4.2V, ΔI L =180mA
to 240mA (30% to 40%) and f=1.3MHz gives
A 3.3μH inductor can be chosen with this
application. An inductor of greater value with
less equivalent series resistance would provide
better efficiency. The CIN capacitor requires
an RMS current rating of at least I LOAD(MAX) /2
and low ESR. In most cases, a ceramic
capacitor will satisfy this requirement.
Fig. 24: VOUT Ripple Voltage
for VIN decreasing close to V OUT
? 2012 Exar Corporation
9/11
Rev. 2.2.0
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相关代理商/技术参数 |
参数描述 |
|---|---|
| SP6669DEK-TRR3 | 制造商:EXAR 制造商全称:EXAR 功能描述:600mA 1.5MHz Synchronous Step Down Converter |
| SP6669EB | 功能描述:电源管理IC开发工具 Eval Board for SP6669 Series RoHS:否 制造商:Maxim Integrated 产品:Evaluation Kits 类型:Battery Management 工具用于评估:MAX17710GB 输入电压: 输出电压:1.8 V |
| SP668 | 制造商:Power-One 功能描述: |
| SP6680 | 制造商:SIPEX 制造商全称:Sipex Corporation 功能描述:High Efficiency Buck/Boost Charge Pump Regulator |
| SP6680EB | 制造商:SIPEX 制造商全称:Sipex Corporation 功能描述:Evaluation Board Manual |
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