SC21150ACSTRT - 1.2A Sync Buck Regulator, 5.5V Input | Semtech
料号： SC21150ACSTRT ✓ 量产中| 数量 | 单价 | 小计 |
|---|---|---|
| 1 | $0.85 | $0.85 |
| 10 | $0.76 | $7.60 |
| 100 | $0.68 | $68.00 |
| 500 | $0.59 | $295.00 |
| 1,000 | $0.53 | $530.00 |
| 3,000 | $0.48 | $1,440.00 |
SC21150ACSTRT 概述
A buck converter (step-down switching regulator) is a power management IC that efficiently reduces a higher DC input voltage to a lower DC output voltage using high-frequency switching, an inductor, and output capacitance. Within the power management hierarchy, the SC21150 belongs to the synchronous buck converter family, which integrates both high-side and low-side MOSFETs to eliminate the external Schottky diode, achieving peak efficiencies typically above 90% and substantially reducing solution size compared to asynchronous topologies.
Key features of the SC21150 include 1.2 A continuous output current, internal MOSFETs, a fixed or adjustable output voltage, low quiescent current suited for light-load efficiency, programmable switching frequency, and internal soft-start. Because the synchronous switch is integrated, total solution area is dominated only by the small inductor and two ceramic capacitors. Designers gain a complete POL (point-of-load) regulator with minimal external component count.
Architecturally, the device uses peak-current-mode control for fast transient response and simplified loop compensation. The high-side P-channel and low-side N-channel MOSFETs are co-packaged in the WLCSP, and the controller employs adaptive synchronous rectification to maximize efficiency across the load range. Built-in protection features typically include input under-voltage lockout, over-current protection, and thermal shutdown.
Typical applications include single-cell Li-ion powered portable electronics, wearables, IoT sensor nodes, USB-powered accessories, and as a post-DCDC stage for powering MCUs, FPGAs, or RF transceivers from a 3.3 V or 5 V rail. The tiny WLCSP footprint makes it especially attractive for wearables, hearables, and other compact battery-powered products.
When designing with this regulator, pay careful attention to PCB layout: place the input capacitor, inductor, and output capacitor as close to the device as possible to minimize switching noise and EMI, and provide a low-impedance return path under the WLCSP balls to ensure stable operation.
This page synthesizes distributor pricing, drop-in alternatives, and practical PCB design notes not consolidated in the manufacturer datasheet itself, giving engineers a single reference for evaluating SC21150ACSTRT in a new design.
直接替换替代料： SC21150ACSTRT ——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：
SC21150AESTR
✅ 直接替换 ⚠️ 规格未核验📋 参考替代料（不在目录中）
SC21150ACST
✅ 直接替换 ⚠️ 规格未核验📋 参考替代料（不在目录中）
SC21150ACSTR
✅ 直接替换 ⚠️ 规格未核验📋 参考替代料（不在目录中）
SC21150ACSTRT 最大额定值与电气特性
| 拓扑 | Synchronous Buck (Step-Down) |
| 输入电压范围 | 2.5 V to 5.5 V |
| 输出电压范围 | 0.8 V to 5.5 V (adjustable) |
| 最大输出电流 | 1.2 A |
| 输出数量 | 1 |
| 输出类型 | Adjustable |
| Efficiency (Peak) | Up to 95% (typical) |
| 封装 | 6-ball WLCSP (UFBGA) |
| 安装类型 | Surface Mount |
| RoHS 状态 | Compliant |
| Lead-Free | Yes |
| 同步整流器 | Yes (internal MOSFETs) |
| 软启动 | Internal |
| Protection Features | Over-current, Thermal Shutdown, UVLO |
SC21150ACSTRT 6-ball wlcsp (ufbga) 引脚配置指南
SC21150ACSTRT（6-ball wlcsp (ufbga) 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： SC21150ACSTRT.
请参阅 数据手册 以查看完整引脚配置。
典型应用
SC21150ACSTRT 适用于 7 应用s: Wearable Battery-Powered Devices, IoT Sensor Nodes, USB-Powered Accessories, FPGA Core Rail Supply, RF Transceiver Power, Industrial Point-of-Load (POL) Modules, Hearing Aid and Hearable Audio.
Wearable Battery-Powered Devices
The SC21150ACSTRT suits wearable designs because its 6-ball WLCSP occupies less than 5 mm² of PCB area, freeing space for sensors and battery cells. The 2.5 V to 5.5 V input covers a single Li-ion cell directly (3.0 V to 4.2 V nominal), and 1.2 A output can drive an entire Bluetooth SoC plus an OLED display. Peak efficiency of approximately 95% at 3.3 V output keeps battery runtime high, and internal synchronous rectification eliminates an external Schottky, shrinking the BOM. Recommended companion: Nordic nRF52832 (low-power Bluetooth SoC) or PIC32MX270F512L (low-power MCU).
推荐
IoT Sensor Nodes
For IoT sensor nodes, the SC21150ACSTRT converts a 3.3 V or 5 V system rail down to 1.8 V or 1.2 V to power microcontrollers and radios from a 1S Li-ion or two-AA source. Its integrated MOSFETs and small footprint minimize quiescent losses, helping the sensor node meet multi-year battery-life targets. Over-current and thermal shutdown protect the device against load faults in unattended deployments. Recommended companion: PIC18F26K22-I/SO (low-power 8-bit MCU) or S912ZVHL32F1VLL (auto-grade MCU with CAN).
推荐
USB-Powered Accessories
The SC21150ACSTRT accepts the full USB 5 V bus directly (VBUS in 4.75 V to 5.25 V), and steps it down to 3.3 V or 1.8 V to power peripheral MCUs, indicator LEDs, and logic circuitry. Because the device is synchronous with peak efficiency near 95%, USB accessories stay cooler under continuous load. Its WLCSP ball pattern enables integration inside the USB connector housing itself, ideal for USB Type-C dongles. Recommended companion: PI3USB4122ZHEX (USB-C signal switch) or PCA9557DR (I/O expander for LED indicators).
推荐
FPGA Core Rail Supply
Small FPGAs and CPLDs typically require a 1.0 V to 1.8 V core rail that draws 200 mA to 1 A. The SC21150ACSTRT delivers up to 1.2 A with fast transient response, suitable as a point-of-load stage for FPGA VCCINT or auxiliary rails. Its programmable switching frequency can be set above the FPGA clock range to avoid beat-frequency noise coupling. Recommended companion: PIC32MX550F256L-I/PT (32-bit MCU) or SAM9X60T-V/DWB (ARM9 MPU) to manage the FPGA.
推荐
RF Transceiver Power
Low-power RF transceivers demand a clean supply to preserve link margins. The SC21150ACSTRT's internal synchronous rectification and small external ceramic-cap filter produce low ripple on the output rail, suitable for powering sub-GHz or 2.4 GHz transceivers directly from a Li-ion source. The 1.2 A rating covers transceivers in transmit bursts where instantaneous current rises sharply, and the IC's thermal shutdown protects against mismatched antenna conditions.
推荐
Industrial Point-of-Load (POL) Modules
Inside 24 V industrial PLC or sensor backplanes, the SC21150ACSTRT acts as a downstream POL converter after a primary isolated DC/DC stage. The 5.5 V input ceiling limits it to systems with intermediate 5 V distribution, ideal for PLC digital I/O sections. Synchronous rectification helps operate inside sealed IP67 enclosures without thermal hotspots. Recommended companion: PIC24FJ256GB610-I/PT (industrial MCU) or PDRV8343SPHPRQ1 (motor/relay driver).
推荐
Hearing Aid and Hearable Audio
The 6-ball WLCSP package is ideal for ultra-compact hearable form factors, and the 1.2 A output comfortably drives a class-D amplifier plus a Bluetooth Audio SoC. Synchronous rectification avoids audible switching artifacts. The 2.5 V to 5.5 V input accommodates a single Li-ion or Zn-air cell pair. Engineers designing audio hearables should choose this part for the small PCB footprint and high efficiency at moderate loads. Recommended companion: small analog op-amp such as OPA2206ADGKR for output stage.
推荐
推荐产品汇总
工程参考数据： SC21150ACSTRT ——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 | SC21150AESTR | SC21150ACST | SC21150ACSTR |
|---|---|---|---|---|
| Brand | Semtech | Semtech | Semtech | Semtech |
| Package | 6-ball WLCSP | 6-ball WLCSP | 6-ball WLCSP | 6-ball WLCSP |
| Topology | Synchronous Buck | Synchronous Buck | Synchronous Buck | Synchronous Buck |
| Input Voltage Range | 2.5 V to 5.5 V | 2.5 V to 5.5 V | 2.5 V to 5.5 V | 2.5 V to 5.5 V |
| Output Voltage Range | 0.8 V to 5.5 V | 0.8 V to 5.5 V | 0.8 V to 5.5 V | 0.8 V to 5.5 V |
| Output Current | 1.2 A | 1.2 A | 1.2 A | 1.2 A |
| Synchronous Rectification | Yes (internal) | Yes (internal) | Yes (internal) | Yes (internal) |
| Reel/Packaging Variant | ACSTRT (7" T&R) | AESTR variant suffix | ACST variant suffix | ACSTR variant suffix |
关键差异点
- Tiny 6-ball WLCSP package - smallest in class （对比 Larger QFN synchronous buck regulators)
- Integrated synchronous MOSFETs （对比 Asynchronous buck regulators with external Schottky diode)
- 2.5 V to 5.5 V wide input from a single Li-ion cell （对比 Buck regulators with narrower input ranges)
设计说明
Place the input capacitor, inductor, and output capacitor as close as possible to the WLCSP balls to minimize parasitic inductance and switching noise. Recommended: 22 µF X5R 6.3 V ceramic on VIN and 22 µF X5R 6.3 V ceramic on VOUT, both within 1 mm of the respective package balls. The bottom-side ground paddle of the WLCSP must be soldered to a large ground copper pour for both electrical return and thermal dissipation.
Estimated: at 5 V input, 3.3 V output, 1.2 A load, the SC21150ACSTRT dissipates approximately (5 - 3.3) x 1.2 = 2.04 W internally (assuming 95% efficiency). The WLCSP thermal resistance theta_JA is approximately 50 C/W when mounted on a standard 4-layer PCB with thermal vias. Junction temperature rise is ~50 C x 2 W = 100 C above ambient; operation is therefore safe in 25 C ambient but derate for higher temperatures. Keep continuous load below 0.8 A in sealed enclosures.
Keep the feedback (FB) trace short and routed away from the SW node to avoid coupling switching noise into the regulation loop. Place the FB resistor divider near the IC, not near the load. Avoid routing high-speed digital or RF traces directly above or below the switch node (the inductor's connection) to prevent radiated EMI coupling. Use a 4-layer board with a continuous ground plane under the regulator.
Never operate the SC21150ACSTRT below 2.5 V input - the device enters under-voltage lockout and the output collapses. Avoid exceeding 5.5 V on VIN; absolute maximum VIN is 6.0 V (per typical Semtech datasheet practices). When using ceramic output capacitors, verify they retain at least 50% of their nominal capacitance at the DC bias voltage, or output ripple will be higher than expected.
合规信息
RoHS and lead-free compliance confirmed by IC-Components listing (2026-10-10). Halogen-free and conflict-minerals declarations are not explicitly stated in the available web data; consult the manufacturer for a formal declaration. The part is not AEC-Q100 qualified - it is intended for commercial and industrial environments.
