SC21150ACSTRT - 1.2A Sync Buck Regulator, 5.5V Input | Semtech
MPN: SC21150ACSTRT ✓ Hoạt độngSC21150ACSTRT Tóm tắt
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.
Bộ thay thế dễ dàng lắp đặt cho SC21150ACSTRT — cùng gói, chân-to-chân tương thích. Các bộ phận yêu cầu hàn PCB bị loại trừ.
SC21150AESTR
✅ Drop-In ⚠️ Thông số chưa được xác minh📋 Tham chiếu thay thế (không có trong danh mục)
SC21150ACST
✅ Drop-In ⚠️ Thông số chưa được xác minh📋 Tham chiếu thay thế (không có trong danh mục)
SC21150ACSTR
✅ Drop-In ⚠️ Thông số chưa được xác minh📋 Tham chiếu thay thế (không có trong danh mục)
SC21150ACSTRT Tỷ lệ tối đa & tính chất điện
| Cấu trúc | Synchronous Buck (Step-Down) |
| Phạm vi điện áp đầu vào | 2.5 V to 5.5 V |
| Khoảng điện áp đầu ra | 0.8 V to 5.5 V (adjustable) |
| Điện áp tối đa đầu ra | 1.2 A |
| Số lượng đầu ra | 1 |
| Kiểu đầu ra | Adjustable |
| Efficiency (Peak) | Up to 95% (typical) |
| Hộp | 6-ball WLCSP (UFBGA) |
| Kiểu lắp đặt | Surface Mount |
| Trạng thái RoHS | Compliant |
| Lead-Free | Yes |
| Cân bằng đồng bộ | Yes (internal MOSFETs) |
| Bắt đầu mềm | Internal |
| Protection Features | Over-current, Thermal Shutdown, UVLO |
Hướng dẫn cấu hình chân SC21150ACSTRT 6-ball wlcsp (ufbga)
Cấu hình chân cho SC21150ACSTRT (6-ball wlcsp (ufbga) gói). Động cơ điện này có chân cổng, nguồn và đầu ra. Đối với các gói không phân極, tham khảo tài liệu thông số kỹ thuật của nhà sản xuất để biết hướng dẫn chính xác của chân 1 và chi tiết về vân footprint. Các ứng dụng phổ biến bao gồm thiết kế nguồn cung cấp điện, điều khiển động cơ và chuyển đổi tải.
Không có dữ liệu chân cụ thể sẵn có cho SC21150ACSTRT.
Tham khảo: tài liệu kỹ thuật cho cấu hình chân đầy đủ.
Ứng dụng tiêu biểu
SC21150ACSTRT phù hợp cho 7 Áp dụngs: 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).
Được đề xuất
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).
Được đề xuất
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).
Được đề xuất
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.
Được đề xuất
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.
Được đề xuất
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).
Được đề xuất
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.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho SC21150ACSTRT — so sánh, hướng dẫn thiết kế và thông tin tuân thủ.
Hướng dẫn chọn lựa
So sánh với các sản phẩm thay thế
| Tham số | Sản phẩm này | 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 |
Bảo phân biệt quan trọng
- Tiny 6-ball WLCSP package - smallest in class (vsLarger QFN synchronous buck regulators)
- Integrated synchronous MOSFETs (vsAsynchronous buck regulators with external Schottky diode)
- 2.5 V to 5.5 V wide input from a single Li-ion cell (vsBuck regulators with narrower input ranges)
Ghi chú thiết kế
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.
Thông tin tuân thủ
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.
