SP7650EB - 3A Buck Regulator Eval Board | MaxLinear
MPN： SP7650EB ✓ 啟用中SP7650EB 概覽
A switching regulator controller is an integrated circuit that uses PWM control and external or internal power switches to step a higher DC input voltage down to a lower DC output voltage with high efficiency. Switching regulators are preferred over linear regulators when the input-to-output voltage differential is large or when output currents exceed roughly 0.5 A, because they dissipate far less power. The SP7650 belongs specifically to the synchronous buck controller family, characterized by an integrated high-side switch and low-side synchronous rectifier that eliminate the need for an external Schottky diode, further reducing conduction loss and PCB footprint.
Key specifications of the SP7650EB include an evaluation platform input range of 2.5V to 28V, a configurable output down to 0.8V, continuous load capability of 3A, a fixed switching frequency of 300 kHz, and built-in UVLO detection on both VCC and VIN rails. The board showcases the controller's soft-start, current-mode control loop, and synchronized rectification topology. Its small total solution size, achieved through the 300 kHz switching frequency, allows engineers to use compact inductors and ceramic output capacitors in their end design.
Typical applications include distributed power bus conversion from 12V or 24V backplanes, point-of-load regulation for FPGAs, ASICs, and DSPs, telecom base-station intermediate rails, and industrial control supplies that must operate reliably across wide input transients. The dual-supply topology is particularly attractive in systems where a 5V housekeeping rail is already present, allowing the controller to operate from that low-voltage supply while the switching stage handles the full 28V input span.
When designing with this evaluation board, ensure that adequate input bulk capacitance is placed near the VIN pins and that the feedback resistor divider is selected with 1% tolerance or better to maintain tight output voltage regulation. The fixed 300 kHz operation simplifies EMI filter design but requires attention to switching-node layout to minimize radiated noise in noise-sensitive systems.
直接替換替代品，適用於 SP7650EB — 相同封裝，腳位對腳位相容。需重新設計 PCB 的不同封裝零件不列入。
此系列的變體
與下列產品可直接替換的同系列型號： SP7650EB （相同外形與佔位） — 差異在於 Input Voltage Range, Switching Frequency, Topology, Control Method, Output Voltage Range.
SP7650ER
✅ 直接替換📋 參考替代品（不在目錄中）
TPS5430DDAR
✅ 直接替換聯絡詢價
查看資料表 →LT1765EFE
✅ 直接替換📋 參考替代品（不在目錄中）
NCP3170ADR2G
✅ 直接替換📋 參考替代品（不在目錄中）
TPS54331DR
✅ 直接替換聯絡詢價
查看資料表 →SP7650EB 最大額定值與電氣特性
| Product Type | Evaluation Board for Buck Regulator Controller |
| Supported Regulator MPN | SP7650 (synchronous buck controller) |
| 輸入電壓範圍 | 2.5 V to 28 V |
| 輸出電壓範圍 | 0.8 V minimum (adjustable) |
| 最大輸出電流 | 3 A |
| 切換頻率 | 300 kHz |
| 拓撲 | Synchronous Buck (step-down) |
| Power Switch Type | Built-in low RDS(ON) MOSFETs |
| Control Method | Current-mode PWM |
| UVLO Detection | Both VCC and VIN rails |
| Controller Supply (VCC) | 5 V (separate from main VIN) |
| Maximum Operating Temperature | +85 C |
| Minimum Operating Temperature | 0 C |
| Board Function | Easy evaluation: 12V input to 3A output synchronous buck |
| Manufacturer | MaxLinear (formerly Exar / Sipex) |
| Datasheet Pages | 16 pages (evaluation board manual per alldatasheet) |
SP7650EB standard 腳位配置指南
SP7650EB（standard 封裝）的腳位配置。 此功率元件具有閘極、汲極與源極端子。對於非極性封裝，請參閱製造商資料表以取得確切的第 1 腳方向與佈局詳細資訊。常見應用包括電源設計、馬達驅動與負載切換。
無詳細腳位定義資料： SP7650EB.
請參閱 資料表 以查看完整腳位配置。
典型應用
SP7650EB 適用於 6 應用s: 12V Distributed Power Bus Point-of-Load Conversion, 24V Industrial Backplane Power Conversion, FPGA / ASIC / DSP Core Voltage Regulation, Telecom Intermediate Bus Conversion, Portable and Battery-Powered Equipment Charging Rails, Test and Measurement Instrumentation Power Stages.
12V Distributed Power Bus Point-of-Load Conversion
The SP7650EB evaluation board's 2.5V-28V input range and 3A output capability make it well-suited for stepping a 12V distributed bus down to lower logic rails. Built-in low RDS(ON) synchronous MOSFETs minimize conduction loss and eliminate the external Schottky diode, which is critical for space-constrained POL modules. With a fixed 300 kHz switching frequency and separate 5V VCC bias, the SP7650 controller achieves higher efficiency than single-supply controllers at high VIN. Test points on the SP7650EB let engineers directly observe switching-node behavior, soft-start, and load-step response during characterization of the 12V-to-low-voltage converter stage.
推薦
24V Industrial Backplane Power Conversion
Industrial backplanes often run on 24V, requiring buck regulators with input headroom above 20V. The SP7650 controller's 28V absolute-maximum VIN rating - directly characterized on the SP7650EB evaluation board - covers 24V nominal buses with margin for transients and load-dump events. The 3A continuous output current drives downstream sensor interfaces, isolated DC-DC primaries, and analog signal-conditioning circuitry. The dual VCC/VIN UVLO detection ensures the controller only begins switching when both rails are within valid ranges, preventing cross-conduction during power-up of backplane plug-in cards.
推薦
FPGA / ASIC / DSP Core Voltage Regulation
Modern FPGAs, ASICs, and DSPs require sub-1V core rails supplied by high-current point-of-load converters. The SP7650 controller, demonstrated on the SP7650EB board, supports output voltages down to 0.8V with 3A capability - sufficient for many mid-range processor cores. The 300 kHz switching frequency permits small ceramic output capacitors and a compact inductor, allowing the POL stage to fit directly next to the load. The current-mode control topology ensures clean transient response to the large load steps typical when processors enter and exit low-power states.
推薦
Telecom Intermediate Bus Conversion
Telecom systems commonly use -48V nominal rectified inputs stepped down to a 12V intermediate bus, then further converted to logic-level rails. The SP7650EB evaluation platform supports the second-stage 12V-to-logic conversion at 3A with high efficiency. Built-in synchronous rectification lowers switching losses and improves thermal performance in fanless telecom enclosures. The fixed 300 kHz frequency, falling below the AM broadcast band, simplifies conducted-EMI filter design for NEBS compliance.
推薦
Portable and Battery-Powered Equipment Charging Rails
Battery-powered equipment often generates intermediate rails from a wide-range input as the battery voltage sags and recovers. The SP7650EB's 2.5V-28V input range directly accommodates 2- to 4-cell lithium packs, lead-acid batteries, and USB-PD rails in their various output modes. Synchronous rectification and low RDS(ON) MOSFETs maximize efficiency, extending battery runtime. The 0 C to +85 C operating range covers most consumer and pro-sumer portable equipment environments.
推薦
Test and Measurement Instrumentation Power Stages
Bench and production test equipment requires stable, low-noise internal power rails for analog signal conditioning, ADCs, and DACs. The SP7650 controller, demonstrated on the SP7650EB evaluation board, provides a regulated 3A rail with clean PWM operation and synchronous rectification that avoids the heavy diode-recovery transients of non-synchronous designs. Combined output-side LC filtering, made feasible by the 300 kHz switching frequency, easily attenuates switching ripple below the noise floor of sensitive measurement channels.
推薦
推薦產品摘要
工程參考資料，適用於 SP7650EB — 比較、設計指引及合規資訊。
選型指南
與替代品比較
| 參數 | 本產品 | SP7650ER | TPS5430DDA | LT1765EFE | NCP3170ADR2G | TPS54331DR |
|---|---|---|---|---|---|---|
| Brand | MaxLinear | MaxLinear | Texas Instruments | Analog Devices | onsemi | Texas Instruments |
| Package | Evaluation Board (PCB assembly) | Evaluation Board (PCB assembly) - same | SO PowerPAD-8 (controller IC) | TSSOP-16 (controller IC) | SOIC-8 (controller IC) | SOIC-8 (controller IC) |
| Input Voltage Range | 2.5 V to 28 V | 2.5 V to 28 V | 5.5 V to 36 V | 3 V to 25 V | 4.5 V to 18 V | 3.6 V to 28 V |
| Maximum Output Current | 3 A | 3 A | 3 A | 3 A | 3 A | 3 A |
| Switching Frequency | 300 kHz | 300 kHz | 500 kHz | 1.5 MHz | 500 kHz | 570 kHz |
| Output Voltage Range | 0.8 V minimum (adjustable) | 0.8 V minimum (adjustable) | 1.221 V ref | 1.2 V minimum (adjustable) | 0.9 V minimum (adjustable) | 0.8 V minimum (adjustable) |
| Synchronous Rectification | Yes (built-in low RDS(ON) MOSFETs) | Yes | Yes (built-in) | No (external switch) | Yes (built-in) | Yes (built-in) |
| Dual UVLO (VCC & VIN) | Yes | Yes | No (VIN only) | No (VIN only) | No (VIN only) | No (VIN only) |
主要差異化特點
- Dual UVLO detection on both VCC and VIN rails (對比TPS5430DDA)
- 300 kHz switching frequency for compact magnetics (對比LT1765EFE)
- Wide 2.5 V to 28 V input in a single part (對比NCP3170ADR2G)
設計說明
Estimated: at VIN = 12 V, VOUT = 3.3 V, and IOUT = 3 A, the SP7650 controller's power dissipation is approximately (12 - 3.3) x 3 = 26.1 W if no synchronous rectification were used; with internal synchronous MOSFETs and 90%+ efficiency at this operating point, dissipation is closer to 1.3 W. The PCB layout must provide sufficient copper pour under the controller package (or under the FETs of a discrete version) to keep the junction rise below 50 C. Always verify with the actual efficiency curve in the SP7650 datasheet.
Place the input bulk capacitor(s) within 5 mm of the VIN pin to minimize switching-node ringing. Keep the feedback (FB) trace short and routed away from the SW node to avoid noise coupling; a 10 kohm / 1 kohm divider pair at 1% tolerance achieves accurate output voltage. The exposed pad / thermal pad on the SO PowerPAD or DFN package variants of the SP7650 must be soldered to a continuous ground pour for both electrical and thermal performance.
Do not assume the SP7650 controller can be biased directly from VIN - the dedicated 5 V VCC rail must be supplied externally or generated locally; powering VCC from VIN without proper regulation will exceed absolute-maximum ratings on the VCC pin. Also, ensure the BST (bootstrap) capacitor is sized per the datasheet's recommended value (typically 0.1 uF to 1 uF); undersized bootstrap capacitance causes high-side gate drive loss and excess heating. Operating the SP7650EB without the VCC supply connected will result in no switching activity.
The 300 kHz fixed switching frequency puts the fundamental and its harmonics in the 0.3-3 MHz range - well above the AM broadcast band, which simplifies conducted-EMI filter design. However, the SW node is a high-dV/dt source; minimize the loop area formed by the high-side FET, low-side FET, and input decoupling capacitor. A shielded inductor or a careful input-pi filter further attenuates radiated emissions. For CISPR 22 / EN 55022 compliance in telecom or industrial designs, allocate a footprint for common-mode chokes on the input harness.
合規資訊
Evaluation board - compliance status not specifically verified on the verified web pages. SP7650EB is commercial-grade (0 to +85 C operating range per manufacturer datasheet), so AEC-Q100 is not applicable.
