中文
EnglishEUP3475A是一款1MHz固定频率同步电流模降压型DC-DC变换器。芯片集成了135mΩ主开关和 90mΩ同步整流开关，在4.5V～28V的输入范围内能够提供高达3A的负载电流。
摘要：EUP3475A是一款1MHz固定频率同步电流模降压型DC-DC变换器。芯片集成了135mΩ主开关和 90mΩ同步整流开关，在4.5V～28V的输入范围内能够提供高达3A的负载电流。
目录
一,产品概述(General Description)
EUP3475A是一款1MHz固定频率同步电流模降压型DC-DC变换器。<a href="http://www.jtm-ic.com/a/xinwenzhongxin/xingyexinwen/2015/0707/11.html" target="_blank" style="padding: 0px; margin: 0px; color: rgb(37, 110, 177); text-decoration: none;">芯片集成了135mΩ主开关和 90mΩ同步整流开关，在4.5V～28V的输入范围内能够提供高达3A的负载<a href="http://www.jtm-ic.com/a/xinwenzhongxin/" target="_blank" style="padding: 0px; margin: 0px; color: rgb(37, 110, 177); text-decoration: none;">电流。内部集成了同步整流开关，不再需要外接肖特基二极管，提高了效率。电 流模控制提供了<a href="http://www.jtm-ic.com/a/xinwenzhongxin/" target="_blank" style="padding: 0px; margin: 0px; color: rgb(37, 110, 177); text-decoration: none;">快速</span>的瞬态响应和周期性的峰值电流限制<a href="http://www.jtm-ic.com/a/xinwenzhongxin/xinpinjishu/" target="_blank" style="padding: 0px; margin: 0px; color: rgb(37, 110, 177); text-decoration: none;">能力。</span>
在重负载时，EUP3475A工作于固定频率脉冲宽度调制模式（PWM）以获得优异的稳定性和瞬态回应。在轻负载时，EUP3475A会自动工作于脉冲跳跃模式以节省<a href="http://www.jtm-ic.com/a/xinwenzhongxin/xinpinjishu/" target="_blank" style="padding: 0px; margin: 0px; color: rgb(37, 110, 177); text-decoration: none;">功耗</span>。</span>
EUP3475A具有短路和过温等保护机制，以确保芯片工作的安全性。可编程的软启动有效减小了输入浪涌电流和启动时的输出过冲。芯片在关断模式下的静态电流可低至1μA以下。EUP3475A采用带有裸露底盘的SOP-8封装。</span>
• 轻负载自动脉冲跳跃模式</span>
• 高达3A的输出电流</span>
• 110ns最小TON时间
• 集成的135mΩ主开关</span>
• 集成的90mΩ同步整流开关</span>
• 输入电压范围：4.5V至28V
• 输出电压可调范围：0.8V至24V
• 效率高达95%
• 可编程的软启动</span>
• 关断电流小于1μA
• 1MHz固定开关频率</span>
• 过温保护和过流保护</span>
• 输入欠压保护
• SOP-8(EP)封装
• 符合RoHS规范及Pb-Free
三</span>,应用范围 (Applications)
•分布式电源<br style="padding: 0px; margin: 0px;"/>• 网络系统
• FPGA、DSP及ASIC电源
下载产品资料PDF文档
 | upd3475a |
| EUP3476A |
| Number | Pin Name | Description |
| 1 | BS | High-Side Gate Drive Boost Input. BS supplies the drive for the high-side N-Channel DMOS switch. Connect a 0.01μF or greater capacitor from SW to BS to power the high side switch. |
| 2 | IN | Power Input. IN supplies the power to the IC, as well as the step-down converter switches. Drive IN with a 4.5V to 28V power source. Bypass IN to GND with a suitably large capacitor to eliminate noise on the input to the IC. See Input Capacitor. |
| 3 | SW | Power Switching Output. SW is the switching node that supplies power to the output. Connect the output LC filter from SW to the output load. Note that a capacitor is required from SW to BS to power the high-side switch. |
| 4 9 (Exposed Pad) | GND | Ground. The exposed pad must be soldered to a large PCB and connected to GND for maximum power dissipation. |
| 5 | FB | Feedback Input. FB senses the output voltage and regulates it. Drive FB with a resistive voltage divider connected to it from the output voltage. The feedback threshold is 0.8V. See Setting the Output Voltage. |
| 6 | COMP | Compensation Node. COMP is used to compensate the regulation control loop. Connect a series RC network from COMP to GND. In some cases, an additional capacitor from COMP to GND is required. See Compensation Components. |
| 7 | EN | Enable Input. EN is a digital input that turns the regulator on or off. Drive EN high to turn on the regulator; low to turn it off. Connect to IN with a 100K pull up resistor for automatic startup. |
| 8 | SS | Soft-Start Control Input. SS controls the soft-start period. Connect a capacitor from SS to GND to set the external soft-start period, or leave SS floating to set the internal soft-start period. A 0.1μF capacitor sets the soft-start period to about 15ms. Leave SS pin floating, and the internal soft-start period is about 300μs. |
六</span>.电路原理图</span>
七</span>,功能概述
| Part Number | Iout (mA) | Vin (V) | Vout (V) | IQ (μA) | FB (V) | Freq. (KHz) | Peak Efficency (%) | Package |
| EUP34061.5MHz, 600mA Synchronous Step-Down Converter | 600 | 2.5 ~ 5.5 | 0.6~Vin | 270 | 0.6 | 1500 | > 96 | SOT23-5 |
| EUP34081.5MHz, 800mA Synchronous Step-Down Converter with Soft Start | 800 | 2.5 ~ 5.5 | 0.6~Vin | 270 | 0.6 | 1500 | > 96 | TSOT23-5,SOT23-5 |
| EUP3409Dual 1.5MHz, 800mA Synchronous Step-Down Converter | 800 / 800 | 2.5 ~ 5.5 | 0.6~5 | 270 | 0.6 | 1500 | > 96 | TDFN-10 |
| EUP3010/B1.5MHz,1A Synchronous Step-Down Converter with Soft Start | 1000 | 2.5 ~ 5.5 | 0.6~5 | 270 | 0.6 | 1500 | > 96 | TDFN-6,SOT23-5,TSOT23-5 |
| EUP32901A, 2.25MHz Synchronous Step-Down DC/DC Regulator | 1000 | 2.7 ~ 5.5 | 0.6~Vin | 30 | 0.6 | 2250 | > 95 | TDFN-6,TSOT23-5 |
| EUP3020Dual High-Efficiency 1.5MHz 1A PWM Step-Down DC-DC Converter | 1000 /1000 | 2.5 ~ 5.5 | 0.6~5 | 270 | 0.6 | 1500 | > 96 | TDFN-12 |
| EUP3402Dual 1A, 2.25MHz Synchronous Step-Down DC/DC Regulator | 1000/1000 | 2.7 ~ 5.5 | 0.6~Vin | 45 | 0.6 | 2250 | > 95 | TDFN-10 |
| EUP3292Dual 1A, 2.25MHz Synchronous Step-Down DC/DC Regulator | 1000/1000 | 2.7 ~ 5.5 | 0.6~Vin | 30 | 0.6 | 2250 | > 95 | TDFN-12 |
| EUP34581.2A,30V,1.2MHz Step-Down Converter | 1200 | 4.5 ~ 30 | 0.8~15 | 550 | 0.8 | 1200 | > 92 | SOT23-6 |
| EUP34121.5A/1.5MHz, Synchronous Step-Down Converter with Soft Start | 1500 | 2.5 ~ 5.5 | 0.7~5 | 300 | 0.5 | 1500 | > 96 | MSOP-10(EP),TDFN-10 |
| EUP32911.5A, 2.25MHz Synchronous Step-Down DC/DC Regulator | 1500 | 2.7 ~ 5.5 | 0.6~Vin | 30 | 0.6 | 2250 | > 95 | TDFN-6 |
| EUP34551.5A,40V,200KHz Step-Down Converter | 1500 | 4.75 ~ 40 | 0.92~15 | 550 | 0.92 | 200 | > 95 | SOP-8 |
| EUP34202A/1.5MHz, Synchronous Step-Down Converter with Soft Start | 2000 | 2.5 ~ 5.5 | 0.7~5 | 300 | 0.5 | 1500 | > 96 | MSOP-10(EP),TDFN-10 |
| EUP34212A, Synchronous Step-Down Converter | 2000 | 2.7 ~ 5.5 | 0.8~5 | 500 | 0.8 | 1000 | > 96 | SOP-8 |
| EUP34012A, 3MHz Synchronous Step-Down DC-DC with I2C Compatible Interface | 2000 | 2.7 ~ 5.5 | 0.75~1.5375 | 43 | - | 3000 | > 92 | TDFN-10 |
| EUP3482P2A, 24V, 340KHz Synchronous Step-Down Converter | 2000 | 4.5~24 | 0.923~18 | 450 | 0.923 | 340 | >95 | SOP-8 |
| EUP3482S2A, 24V, 340KHz Synchronous Step-Down Converter | 2000 | 4.5~24 | 0.923~18 | 450 | 0.923 | 340 | >95 | SOP-8 |
| EUP34822A, 30V, 340KHz SynchronousStep-Down Converter | 2000 | 4.5 ~ 30 | 0.923~20 | 450 | 0.923 | 340 | >93 | SOP-8 |
| EUP3482A2A, 30V, 340KHz Synchronous Step-Down Converter | 2000 | 4.5~30 | 0.923~20 | 450 | 0.923 | 340 | >95 | SOP-8 |
| EUP3482B2A, 30V, 340KHz Synchronous Step-Down Converter | 2000 | 4.5~30 | 0.923~20 | 450 | 0.923 | 340 | >95 | SOP-8 |
| EUP32263A, Synchronous Step-Down Converter | 3000 | 2.7~5.5 | 0.6~5 | 500 | 0.6 | 1000 | >96 | TDFN-10,SOP-8(EP) |
| EUP34513A,30V,500KHz Step-Down Converter | 3000 | 4. 5 ~ 30 | 0.8~12 | 450 | 0.8 | 500 | > 95 | SOP-8(EP) |
| EUP3484P3A, 24V, 340KHz Synchronous Step-Down Converter | 3000 | 4.5~24 | 0.925~18 | 450 | 0.923 | 340 | >95 | SOP-8(EP) |
| EUP3484S3A, 24V, 340KHz Synchronous Step-Down Converter | 3000 | 4.5~24 | 0.923~18 | 450 | 0.923 | 340 | >95 | SOP-8(EP) |
| EUP34763A, 28V, 500kHz Synchronous Step-Down Converter | 3000 | 4.5 ~ 28 | 0.8~24 | 1100 | 0.8 | 500 | >95 | SOP-8(EP) |
| EUP3476A3A, 28V, 500kHz Synchronous Step-Down Converter | 3000 | 4.5 ~ 28 | 0.8~24 | 1100 | 0.8 | 500 | >95 | SOP-8（EP）</td> |
| EUP34753A, 28V, 1MHz Synchronous Step-Down Converter | 3000 | 4.5 ~ 28 | 0.8~24 | 1100 | 0.8 | 1000 | >95 | SOP-8(EP),TDFN-8(EP) |
| EUP3475A3A, 28V, 1MHz Synchronous Step-Down Converter | 3000 | 4.5 ~ 28 | 0.8~24 | 1100 | 0.8 | 1000 | >95 | SOP-8（EP）</td> |
| EUP34843A, 30V, 340KHz Synchronous Step-Down Converter | 3000 | 4.5 ~ 30 | 0.925~12 | 450 | 0.925 | 340 | >95 | SOP-8(EP) |
| EUP3484A3A, 30V, 340KHz Synchronous Step-Down Converter | 3000 | 4.5~30 | 0.923~20 | 450 | 0.925 | 340 | >95 | SOP-8(EP) |
| EUP34533A,40V,200KHz Step-Down Converterr | 3000 | 4.75 ~ 40 | 0.92~15 | 550 | 0.92 | 200 | >95 | SOP-8(EP) |
| EUP34903A,40V,200KHz Step-Down Converter | 3000 | 4.75~40 | 0.92~15 | 550 | 0.92 | 200 | >95 | SOP-8(EP) |
| EUP3466CC/CV Mode Step-Down Converter | 3000 | 8 ~ 36 | 1.18~15 | 500 | 1.18 | 80 | >95 | SOP-8 |
| EUP34233.2A, Synchronous Step-Down Converter | 3200 | 2.7 ~ 5.5 | 0.8~5 | 500 | 0.8 | 1000 | > 96 | SOP-8(EP) |
| EUP34274A, Synchronous Step-Down Converter | 4000 | 2.7 ~ 5.5 | 0.6~5 | 500 | 0.6 | 1000 | > 96 | SOP-8 (EP),TDFN-10 |
| EUP34854A, 21V, 500KHz Synchronous Step-Down Converter | 4000 | 4.5 ~ 21 | 0.8~15 | 900 | 0.808 | 500 | >95 | SOP-8(EP) |
| EUP34674A, CC/CV Mode Step-Down Converter | 4000 | 8 ~ 36 | 1.18~15 | 500 | 1.18 | 80 | > 95 | SOP-8 (EP) |
| EUP34255A, 1MHz Synchronous Step-Down Converter | 5000 | 2.7 ~ 5.5 | 0.8~5 | 500 | 0.8 | 1000 | > 96 | TDFN |
| EUP32955A, 3MHz Synchronous Step-Down DC-DC with I2C Compatible Interface | 5000 | 2.7~5.5 | 0.6~1.4 | 52 | - | 3000 | - | WCSP-20 |
| EUP34895A,30V,500KHz Step-Down Converter | 5000 | 5.5 ~ 30 | 1.222~26 | 550 | 1.222 | 500 | > 95 | SOP-8(EP) |
| EUP32166A Synchronous Step-Down Converter | 6000 | 3.3~5.5 | 0.6~2 | 1000 | 0.6~2 | 1200 | >93 | TQFN-20 |
| EUP3207Complete DDRⅡ/DDRⅢ Memory Power Supply Controller | 10000 | 2.5~26 | 0.75~3.3 | 1 |
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