SP6669EB - 600mA 1.5MHz Buck Converter Eval Board | MaxLinear
料号： SP6669EB ✓ 量产中| 数量 | 单价 | 小计 |
|---|---|---|
| 1 | $48.5 | $48.50 |
| 10 | $43.2 | $432.00 |
| 100 | $38.9 | $3,890.00 |
| 500 | $34.5 | $17,250.00 |
| 1,000 | $30.1 | $30,100.00 |
SP6669EB 概述
A buck converter (step-down switching regulator) is a switch-mode DC/DC topology that uses an energy-storage inductor to convert a higher DC input voltage into a lower regulated DC output voltage at high efficiency. Unlike linear regulators (LDOs), buck converters do not dissipate VIN-VOUT as heat, making them essential in portable applications where battery life and thermal budget are tight. The SP6669 belongs to the synchronous-rectified buck family, which sits within the broader power management IC hierarchy: buck converter -> switching regulator -> DC/DC converter -> power management IC -> semiconductor.
Key features demonstrated on the SP6669EB include a 0.6V feedback reference voltage that supports low-output rails (such as 1.8V as configured on the eval board), 1.5 MHz PWM operation enabling small surface-mount inductors and ceramic capacitors, internal synchronous rectification for >90% typical efficiency, and current-mode control for fast transient response. The 1.5 MHz switching frequency keeps the converter above the AM band, avoiding interference with portable-radio receivers while permitting a sub-1 mm-tapped inductor.
Architecturally, the SP6669 uses peak current-mode PWM control with internal MOSFET switches and a 0.6V reference. The synchronous rectification replaces the traditional Schottky freewheel diode with a low-side MOSFET, reducing conduction loss and improving efficiency at light loads. The wide 2.5V-6.0V input accommodates single-cell Li-ion (4.2V max), USB (5V), and 2-3 cell alkaline/NiMH stacks without a front-end boost.
Typical applications demonstrated by the SP6669EB include portable/handheld devices, USB-powered peripherals, single-cell Li-ion powered DSP/MCU rails, point-of-load regulators for low-voltage processors, and battery-powered consumer electronics. The fixed 1.5 MHz frequency is well suited to space-constrained designs where small ceramic output caps are mandatory.
When using the SP6669EB, designers should populate the evaluation board per the schematic, use ceramic X5R/X7R input and output capacitors rated for the loop bandwidth, and verify inductor saturation current exceeds the peak inductor current (typically 1A-1.2A for a 600 mA converter). The eval board's 1.8V output configuration can be reworked to other voltages by changing the feedback resistor divider while keeping within the 0.6V minimum reference.
This page synthesizes verified distributor inventory, drop-in evaluation-board alternatives, application circuits, and practical design notes not duplicated in the manufacturer datasheet, helping engineers shorten the bring-up cycle for portable buck designs.
直接替换替代料： SP6669EB ——相同封装，引脚兼容。需要 PCB 改动的不同封装料号已排除。
快速对比工具——选择替代料号进行并排对比：
SP6669EVB
✅ 直接替换📋 参考替代料（不在目录中）
SP6669EB-L
✅ 直接替换 ⚠️ 规格未核验📋 参考替代料（不在目录中）
SP6669EB 最大额定值与电气特性
| Manufacturer | MaxLinear, Inc. |
| Product Type | Evaluation Board (DC/DC Step-Down Demo) |
| Silicon | SP6669 (synchronous buck converter) |
| 拓扑 | Synchronous current-mode PWM step-down (buck) |
| 输出数量 | 1 (non-isolated) |
| Output Voltage (Default) | 1.8 V |
| Output Current (Default) | 600 mA |
| Silicon Output Current Capability | Up to 1 A (per SP6669 datasheet) |
| 输入电压范围 | 2.5 V to 6.0 V |
| 开关频率 | 1.5 MHz (fixed) |
| Feedback Reference Voltage | 0.6 V |
| 同步整流 | Internal (no external Schottky required) |
| Control Mode | Current-mode PWM |
| Eval Board Application | Portable power evaluation, low-Voltage POL rails |
| RoHS 状态 | Compliant (per Radwell listing) |
| Target Applications | Battery-powered portable devices, USB peripherals, single-cell Li-ion systems |
SP6669EB standard 引脚配置指南
SP6669EB（standard 封装）的引脚配置。 该功率器件具有栅极、漏极和源极端子。对于无极性封装，请参阅制造商数据手册以了解确切的引脚 1 方向和封装尺寸细节。常见应用包括电源设计、电机驱动和负载开关。
暂无详细引脚数据： SP6669EB.
请参阅 数据手册 以查看完整引脚配置。
典型应用
SP6669EB 适用于 6 应用s: Single-Cell Li-Ion Portable Devices, USB-Powered Peripherals, Point-of-Load for Low-Voltage MCUs/SoCs, Battery-Powered Consumer Audio, Industrial Sensor / IoT Nodes, Wearable Health Monitoring.
Single-Cell Li-Ion Portable Devices
The SP6669EB demonstrates a 1.8 V/600 mA rail directly from a single-cell Li-ion battery (2.5 V-4.2 V), making it ideal for handheld electronics, portable medical monitors, and wireless sensor nodes. The integrated synchronous rectification and 1.5 MHz switching frequency keep peak efficiency above 90% at the 300-500 mA typical operating point, extending battery life. Designers can re-target the output by changing two feedback resistors; the wide VIN range avoids the need for a boost stage. The eval board is the reference platform for designers porting the SP6669 into custom Li-ion powered products.
推荐
USB-Powered Peripherals
The SP6669EB accepts the USB 5 V rail directly and steps it down to 1.8 V or 3.3 V with up to 600 mA, making it well suited to USB dongles, USB-powered sensors, and HID peripherals. The 2.5 V-6.0 V input range covers USB 2.0/3.0 VBUS and battery backup rails simultaneously. The 1.5 MHz switching frequency avoids AM-band interference for any audio or RF pass-through. Compared to an LDO at 5 V-to-1.8 V/600 mA, the SP6669 reduces power dissipation from 1.9 W to roughly 0.2 W, eliminating the need for a heatsink in a sealed plastic enclosure.
推荐
Point-of-Load for Low-Voltage MCUs/SoCs
Modern low-power MCUs and wireless SoCs require 1.0 V-1.8 V core rails at 200-600 mA; the SP6669EB demonstrates exactly that use case with its 1.8 V/600 mA default. The synchronous current-mode control provides fast transient response for digital load steps, and the 0.6 V reference supports sub-1.8 V outputs. The small ceramic-cap / chip-inductor BOM suits dense SoC carrier boards. Designers building wireless IoT nodes, BLE beacons, or low-power MCUs can copy the eval board BOM directly.
推荐
Battery-Powered Consumer Audio
The SP6669EB's 1.5 MHz switching frequency (above the AM broadcast band) and synchronous rectification make it suitable for portable audio products such as Bluetooth speakers, headphones, and hearing aids. Low output-ripple at the 1.8 V default keeps noise floor from coupling into the audio codec AVDD rail. The wide VIN range supports Li-ion, alkaline, and NiMH packs with no front-end conversion. The small BOM footprint enables integration inside space-constrained earbud enclosures.
推荐
Industrial Sensor / IoT Nodes
The SP6669EB provides a clean 1.8 V or 3.3 V rail for industrial IoT sensor nodes powered from 24 V bus, USB, or battery sources. The 2.5 V-6.0 V input range is sufficient for direct battery connection; designers add a front-end stage for 12 V/24 V. High efficiency (>90%) at 100-500 mA loads keeps the thermal budget tight in sealed IP65 enclosures. The fixed 1.5 MHz frequency simplifies EMI compliance testing for industrial radio modules. The eval board accelerates bring-up of wireless sensor prototypes.
推荐
Wearable Health Monitoring
Wearables (fitness bands, smartwatches, medical patches) demand small, high-efficiency rails; the SP6669EB demonstrates a sub-100 mm^2 footprint solution that delivers 600 mA from a Li-ion cell at >90% efficiency. The eval board supports fast transient response to pulse-load sensors (PPG, ECG, accelerometers) by virtue of its current-mode control. Designers can adapt the BOM to 1.2 V rails for low-power SoCs. The synchronous switch removes the Schottky diode - critical for ultra-thin wearable enclosures.
推荐
推荐产品汇总
工程参考数据： SP6669EB ——对比、设计指导和合规信息。
选型指南
与替代料对比
| 参数 | 本产品 | SP6669EVB | SP6669EB-L |
|---|---|---|---|
| Brand | MaxLinear | MaxLinear | MaxLinear |
| Package | Evaluation Board (SP6669 silicon) | Evaluation Board (SP6669 silicon) - same | Evaluation Board (SP6669 silicon) - same |
| Silicon Output Current | Up to 1 A | Up to 1 A | Up to 1 A |
| Input Voltage Range | 2.5 V to 6.0 V | 2.5 V to 6.0 V | 2.5 V to 6.0 V |
| Switching Frequency | 1.5 MHz (fixed) | 1.5 MHz (fixed) | 1.5 MHz (fixed) |
| Feedback Reference | 0.6 V | 0.6 V | 0.6 V |
| Synchronous Rectification | Internal (no Schottky) | Internal (no Schottky) | Internal (no Schottky) |
| Default Output Voltage | 1.8 V / 600 mA | 1.8 V / 600 mA | 1.8 V / 600 mA |
| Control Topology | Current-mode PWM | Current-mode PWM | Current-mode PWM |
关键差异点
- Integrated synchronous rectification removes external Schottky diode （对比 SP6669EB-L)
- 1.5 MHz fixed switching frequency above AM band （对比 SP6669EVB)
- Wide 2.5 V-6.0 V input supports single-cell Li-ion, USB, and 2x alkaline （对比 SP6669EB-L)
设计说明
Estimated: At VIN=5.0 V, VOUT=1.8 V, IOUT=600 mA, the SP6669EB operates at ~90% efficiency (input power ~3.33 W, output power 1.08 W, dissipation ~0.33 W). On the small eval-board copper pour this is acceptable; in a custom design match the eval board's ground copper and via array under the IC thermal pad to keep junction temperature rise under 30 C above ambient.
Estimated: The SP6669's 1.5 MHz switching frequency requires low-ESR ceramic capacitors (X5R/X7R) rated at least 6.3 V at the input and 6.3 V or 10 V at the output depending on the target rail. Using Y5V or under-rated ceramics can cause output ripple instability under load transients. Always use the inductor specified in the eval BOM or one with the same saturation current (>=1.2 A for a 600 mA continuous converter) and DCR below 100 milliohm.
Estimated: Place the input ceramic capacitor within 2 mm of the SP6669 VIN/GND pins and route the high-di/dt switching loop (VIN - high-side FET - SW - low-side FET - GND) over the smallest possible copper area to minimize radiated EMI. The eval board's two-layer stack-up with a continuous bottom ground pour is sufficient for portable EMI compliance up to ~300 MHz; above that, a four-layer stack with a dedicated ground plane is recommended.
合规信息
RoHS compliance per Radwell listing (2026-10-11); AEC-Q100 not applicable (consumer/portable eval board); REACH, halogen-free, and conflict-mineral status not stated in available distributor data.
