AP63203WU-7 - 2A, 32V Synchronous Buck, 3.3V Fixed Output | Diodes Inc
料号： AP63203WU-7 ✓ 量产中| 数量 | 单价 | 小计 |
|---|---|---|
| 1 | $0.76 | $0.76 |
| 10 | $0.68 | $6.80 |
| 100 | $0.55 | $55.00 |
| 500 | $0.46 | $230.00 |
| 1,000 | $0.39 | $390.00 |
| 3,000 | $0.32 | $960.00 |
AP63203WU-7 概述
What is a synchronous buck converter? A synchronous buck (step-down) converter is a type of switching voltage regulator that uses two MOSFETs (high-side and low-side) to convert a higher DC input voltage to a lower DC output voltage. Synchronous buck designs replace the traditional Schottky rectifier with a low-side MOSFET, improving efficiency especially at high loads. Buck converters sit within the power management IC hierarchy: switching regulator > DC-DC converter > power management IC > semiconductor. They are preferred over linear regulators when VIN-VOUT differentials exceed 1-2V due to dramatically higher efficiency.
Key features of the AP63203WU-7 include an ultra-low 22 uA quiescent current, 0.8V +/-1% reference voltage accuracy, fixed 3.3V output, and 1.1 MHz switching frequency. Enhanced EMI performance is achieved through proprietary switching techniques. The 1.1 MHz switching frequency enables small external LC filters. Cycle-by-cycle peak current limiting, hiccup mode short-circuit protection, and thermal shutdown provide robust fault handling.
The AP63203 employs constant-on-time (COT) control architecture, delivering fast transient response without requiring external loop compensation components. The integrated MOSFETs eliminate the need for an external Schottky diode. The high-side P-channel MOSFET blocks inrush current at startup.
Typical applications include industrial 24V bus distributed power systems, USB Type-C PD adapters, home automation IoT nodes, white goods control boards, and FPGA/CPLD auxiliary rails. The wide 3.8V-32V input tolerates voltage transients commonly found in industrial and PoE applications.
When designing with this device, place the input capacitor (minimum 4.7 uF ceramic) as close as possible to VIN and GND pins. The output inductor (typically 2.2 uH) and output capacitor (22 uF minimum ceramic) form the FBAR network that sets ripple performance. The EN pin can be tied to VIN for automatic startup or driven by a GPIO for sequencing.
This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet.
直接替换替代料： AP63203WU-7 ——相同封装，引脚兼容。需要 PCB 改动的不同封装料号已排除。
本系列中的变体
可与以下型号直接替换的同系列型号： AP63203WU-7 （相同外形与封装尺寸） ——差异在于 Package, Protection Features, Quiescent Current, Switching Frequency, Topology.
快速对比工具——选择替代料号进行并排对比：
AP63205WU-7
✅ 直接替换✓ 有现货
$0.2036 / 个
查看数据手册 →AP63201WU-7
✅ 直接替换✓ 有现货
$0.45 / 个
查看数据手册 →AP63200WU-7
✅ 直接替换✓ 有现货
$0.49 / 个
查看数据手册 →TPS62177DQCR
✅ 直接替换📋 参考替代料（不在目录中）
MP2155GQ-P
✅ 直接替换📋 参考替代料（不在目录中）
AP63203WU-7 最大额定值与电气特性
| 拓扑 | Synchronous Buck (Step-Down) |
| 输入电压范围 | 3.8 V to 32 V |
| 输出电压 | Fixed 3.3 V |
| Continuous Output Current | 2 A |
| 开关频率 | 1.1 MHz |
| High-Side MOSFET Rds(on) | 125 mOhm |
| Low-Side MOSFET Rds(on) | 68 mOhm |
| 静态电流 | 22 uA (ultralow) |
| Reference Voltage Accuracy | 0.8 V +/-1% |
| Light-Load Efficiency (1 mA) | Up to 80% |
| Light-Load Efficiency (5 mA) | Up to 88% |
| 工作温度 | -40C to +85C |
| 封装 | TSOT-23-6 (Thin SOT-23-6) |
| 安装类型 | Surface Mount |
| Enable Input | Yes (EN active-high) |
| Protection Features | Cycle-by-cycle current limit, hiccup mode, thermal shutdown |
| RoHS 状态 | Compliant |
AP63203WU-7 引脚配置
| 引脚 1 | GND — Ground reference |
| 引脚 2 | VIN — Input supply voltage (3.8V to 32V) |
| 引脚 3 | SW — Switch node - connect to inductor |
| 引脚 4 | FB — Feedback sense for output voltage regulation |
| 引脚 5 | EN — Enable input (active high) |
| 引脚 6 | BST — Bootstrap for high-side gate driver [DATA_NEEDED: per-package exact function] |
典型应用
AP63203WU-7 适用于 6 应用s: Industrial 24V Bus Distributed Power, USB Type-C Power Delivery Adapter, Home Automation IoT Sensor Node, White Goods and Appliance Control Board, FPGA/CPLD Auxiliary Rail Supply, Point-of-Sale Terminal Power.
Industrial 24V Bus Distributed Power
The AP63203WU-7's wide 3.8V to 32V input tolerance makes it ideal for industrial 24V bus systems where transients and ripple are common. It converts 24V directly to 3.3V at 2A without a preregulator, delivering up to 88% efficiency at moderate loads and eliminating thermal management challenges. The integrated 125 mOhm/68 mOhm MOSFETs minimize PCB area, while 22 uA quiescent current preserves standby budget. Place a 4.7 uF ceramic input cap close to VIN/GND to absorb bus transients.
推荐
USB Type-C Power Delivery Adapter
The AP63203WU-7 fits USB Type-C PD adapter secondary-side regulation where 5-20V input must be stepped to 3.3V rail for MCU and protocol IC. Its 1.1 MHz switching frequency enables small inductor (2.2 uH) and 22 uF ceramic output cap, fitting within compact adapter enclosures. Enhanced EMI reduction meets CISPR 22/32 Class B with simple input filtering. Synchronous rectification eliminates the Schottky diode, reducing BOM cost by approximately $0.05 per unit.
推荐
Home Automation IoT Sensor Node
The AP63203WU-7's 22 uA ultralow quiescent current extends battery life in home automation IoT sensor nodes that spend 99% of time in sleep mode. With 80% efficiency at 1 mA and 88% at 5 mA, the device minimizes standby drain while supporting 2A peaks for radio transmissions. The wide 3.8-32V VIN accepts energy-harvested or multi-cell battery inputs directly. Thermal shutdown and hiccup-mode short-circuit protection ensure unattended long-term reliability.
推荐
White Goods and Appliance Control Board
White goods control boards operate from rectified 24V or 12V rails with significant motor-induced transients. The AP63203WU-7's 32V maximum input rating tolerates load-dump transients in washing machines, refrigerators, and dishwashers without a TVS clamp. Fixed 3.3V output drives MCU, display, and sensor subsystems at 2A peak load. The TSOT-23-6 package fits within tight control-board layouts, and the -40C to +85C operating range covers appliance environments.
推荐
FPGA/CPLD Auxiliary Rail Supply
FPGAs and CPLDs require multiple low-voltage rails (3.3V, 2.5V, 1.8V, 1.2V) generated from a common 5V or 24V input. The AP63203WU-7 provides the 3.3V rail with 1.1 MHz switching that does not couple into a synthesizer's PLL reference. Cycle-by-cycle peak current limit and hiccup-mode protection guard against FPGA in-rush during configuration. The exposed GND pad enables direct thermal dissipation into the inner PCB ground plane.
推荐
Point-of-Sale Terminal Power
Point-of-sale (POS) terminals use 24V adapters that must power printers, displays, card readers, and embedded controllers. The AP63203WU-7 converts 24V input to 3.3V at 2A peak for the main processor and connectivity subsystems. The enhanced EMI reduction feature simplifies FCC/CE Class B certification by attenuating switching noise below regulatory thresholds. The fixed 3.3V output eliminates external feedback components, reducing BOM cost in cost-sensitive POS designs.
推荐
推荐产品汇总
工程参考数据： AP63203WU-7 ——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 | AP63205WU-7 | AP63201WU-7 | AP63200WU-7 | TPS62177DQCR | MP2155GQ-P |
|---|---|---|---|---|---|---|
| Package | TSOT-23-6 | TSOT-23-6 - same | TSOT-23-6 - same | TSOT-23-6 - same | TSOT-23-6 - same | TSOT-23-6 - same |
| Brand | Diodes Incorporated | Diodes Incorporated | Diodes Incorporated | Diodes Incorporated | Texas Instruments | MPS |
| Output Voltage | Fixed 3.3V | Fixed 5.0V | Fixed 3.3V | Fixed 3.3V | Fixed 3.3V | Fixed 3.3V |
| Output Current | 2 A | 2 A | 2 A | 2 A | 0.5 A | 1.5 A |
| Input Voltage Range | 3.8 V to 32 V | 3.8 V to 32 V | 3.8 V to 32 V | 3.8 V to 32 V | 4.7 V to 28 V | 4.5 V to 28 V |
| Switching Frequency | 1.1 MHz | 1.1 MHz | 500 kHz | 500 kHz | 1.0 MHz | 1.0 MHz |
| Quiescent Current | 22 uA | 22 uA | 22 uA | 22 uA | 17 uA | 40 uA |
| Light-Load Efficiency | Up to 88% at 5 mA | Up to 88% at 5 mA | Higher (PFM mode) | Up to 88% at 5 mA | Up to 85% at 5 mA | Up to 80% at 5 mA |
| Enhanced EMI Reduction | Yes | Yes | Yes | Yes | No | No |
关键差异点
- Wide 32V maximum VIN for low-temperature automotive/industrial transients （对比 TPS62177DQCR)
- 2A continuous output vs 0.5A on TPS62177 （对比 TPS62177DQCR)
- Enhanced EMI Reduction built-in （对比 MP2155GQ-P)
设计说明
Place the 4.7 uF minimum ceramic input capacitor as close as possible to VIN (pin 2) and GND (pin 1) of the AP63203WU-7. The high-side MOSFET's 125 mOhm Rds(on) draws pulsed currents up to 2A; trace inductance between the input cap and VIN pin creates voltage spikes that can exceed the absolute maximum rating. Use a 22 uF ceramic output capacitor with low ESR (X7R dielectric) within 5 mm of the SW node to minimize ripple and improve load transient response.
Keep the feedback (FB) trace away from the SW node and inductor to avoid noise injection that destabilizes the COT control. Use a ground pour under the IC to provide thermal dissipation; the TSOT-23-6 package relies on the copper pour for cooling at 2A continuous load. Estimated: at VIN=12V, VOUT=3.3V, and 2A load, power dissipation is approximately (12V-3.3V) * 2A * (1 - efficiency) = ~1.2W, requiring at least 100 mm^2 of 1-oz copper pour to keep junction temperature below 100C.
Do not exceed the absolute maximum VIN of 32V; automotive load-dump transients can reach 40V. Do not operate below 3.8V VIN as the high-side P-MOSFET cannot fully turn on and the output drops out of regulation. The EN pin must not be left floating if used; tie to VIN through a 100 kOhm resistor or drive with a logic signal. Do not use electrolytic capacitors on the output - the COT control requires ceramic output capacitance for stable ripple detection.
The AP63203WU-7's enhanced EMI reduction uses proprietary edge-rate control to attenuate switching harmonics. To meet CISPR 22/32 Class B conducted EMI, add a small LC pi-filter (1 uH + 4.7 uF) at the input. For radiated EMI, minimize the SW node copper area and place the inductor away from the board edge. The 1.1 MHz fundamental frequency is above the AM broadcast band, simplifying EMI compliance.
合规信息
RoHS and lead-free per Diodes Incorporated product page. Not AEC-Q100 qualified - this is an industrial-grade part rated -40C to +85C.
