SC21150ACSTRT - 1.2A Sync Buck Regulator, 5.5V Input | Semtech
N.º da peça: SC21150ACSTRT ✓ Ativo| Qtd. | Preço unitário | Total |
|---|---|---|
| 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 Visão geral
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.
Alternativas drop-in para SC21150ACSTRT — mesmo encapsulamento, compatível pino a pino. Peças de encapsulamento diferente que exigem retrabalho na PCB são excluídas.
Ferramenta de comparação rápida — selecione peças alternativas para comparação lado a lado:
SC21150AESTR
✅ Drop-In ⚠️ Especificações não verificadas📋 Alternativa de referência (fora do catálogo)
SC21150ACST
✅ Drop-In ⚠️ Especificações não verificadas📋 Alternativa de referência (fora do catálogo)
SC21150ACSTR
✅ Drop-In ⚠️ Especificações não verificadas📋 Alternativa de referência (fora do catálogo)
SC21150ACSTRT Classificações máximas e características elétricas
| Topologia | Synchronous Buck (Step-Down) |
| Faixa de tensão de entrada | 2.5 V to 5.5 V |
| Faixa de tensão de saída | 0.8 V to 5.5 V (adjustable) |
| Corrente máxima de saída | 1.2 A |
| Número de saídas | 1 |
| Tipo de saída | Adjustable |
| Efficiency (Peak) | Up to 95% (typical) |
| Encapsulamento | 6-ball WLCSP (UFBGA) |
| Tipo de montagem | Surface Mount |
| Status RoHS | Compliant |
| Lead-Free | Yes |
| Retificador síncrono | Yes (internal MOSFETs) |
| Soft-start | Internal |
| Protection Features | Over-current, Thermal Shutdown, UVLO |
Guia de Configuração de Pinos do SC21150ACSTRT 6-ball wlcsp (ufbga)
Configuração de pinos para SC21150ACSTRT (pacote 6-ball wlcsp (ufbga)). Este dispositivo de potência possui terminais de gate, drain e source. Para pacotes não polarizados, consulte o datasheet do fabricante para a orientação exata do pino 1 e detalhes do footprint. Aplicações comuns incluem projeto de fontes de alimentação, acionamento de motores e comutação de cargas.
Nenhum dado detalhado de pinagem disponível para SC21150ACSTRT.
Consulte a ficha técnica para a configuração completa dos pinos.
Aplicações típicas
SC21150ACSTRT é adequado para 7 aplicaçãos: 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).
Recomendado
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).
Recomendado
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).
Recomendado
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.
Recomendado
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.
Recomendado
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).
Recomendado
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.
Recomendado
Resumo dos produtos recomendados
Dados de referência de engenharia para SC21150ACSTRT — comparação, orientação de projeto e informações de conformidade.
Guia de seleção
Comparação com alternativas
| Parâmetro | Este produto | 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 |
Principais diferenciais
- Tiny 6-ball WLCSP package - smallest in class (vs Larger QFN synchronous buck regulators)
- Integrated synchronous MOSFETs (vs Asynchronous buck regulators with external Schottky diode)
- 2.5 V to 5.5 V wide input from a single Li-ion cell (vs Buck regulators with narrower input ranges)
Notas de projeto
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.
Informações de conformidade
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.
