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STMicroelectronics STBB1-APUR
- Part No.:
- STBB1-APUR
- Manufacturer:
- STMicroelectronics
- Package:
- 10-VFDFN Exposed Pad
- Datasheet:
-
STBB1-APUR.pdf
- Description:
- IC REG BUCK BOOST ADJ 1.6A 10DFN
- Quantity:
- Payment:
- Shipping:
Inventory:18,700
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Product details
Overview
STBB1-APUR from STMicroelectronics is a high-efficiency, dual-mode buck-boost DC-DC converter with fixed 1.5 MHz switching frequency, 2.3 A peak switch current limit at 3.3 V input, ±2% feedback voltage tolerance (500 mV typ), and synchronous rectification. It operates across 2.0–5.5 V input and delivers 1.2–5.5 V output, supporting single-cell Li-Ion and 3-cell alkaline/NiMH power sources in portable IoT modules.
For engineers reviewing the STBB1-APUR datasheet, STBB1-APUR pinout, STBB1-APUR application, or STBB1-APUR equivalent, this device enables stable regulation where input voltage may be above, below, or equal to output-critical for battery-powered systems requiring seamless transition across discharge curves and load transients.
Technical Context
The STBB1-APUR uses average current mode control with feed-forward compensation to maintain stability across buck, boost, and buck-boost regions-especially when VIN ≈ VOUT. Its four internal MOSFETs (dual N-channel + dual P-channel) enable bidirectional energy transfer with RDS(on)-N/RDS(on)-P ≤ 0.35 Ω each.
Dual-mode operation is controlled via the MODE/SYNC pin: logic-low enables auto-switching between pulse-skipping (power-save) and PWM modes based on load; logic-high forces fixed-frequency PWM for optimal dynamic response. External synchronization (1.3–2.0 MHz) is supported on the same pin.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input voltage range | 2.0 V to 5.5 V - supports full discharge curve of single Li-Ion (2.7–4.2 V) and 3-cell alkaline (3.0–4.5 V). |
| Output voltage range | 1.2 V to 5.5 V - adjustable via external resistor divider on FB pin; fixed-output variants also available. |
| Feedback voltage | 490–510 mV at TA = 25 °C - ±2% tolerance ensures tight output regulation under line/load variation. |
| Switching frequency | 1.3–1.75 MHz (typ. 1.5 MHz) - enables compact LC filtering with 2.2 µH inductor and 10–22 µF ceramic capacitors. |
| Peak switch current limit | 2.3 A at VIN = 3.3 V - sets maximum pulsed load capability; derates per thermal resistance (RTHJA = 30.9 °C/W). |
| Shutdown current | < 1 µA - ensures negligible battery drain during system sleep in portable equipment. |
| Efficiency (typ.) | > 94% at IOUT = 100 mA, VIN = 3.6 V, VOUT = 3.3 V in PWM mode - minimizes thermal rise in sealed IoT enclosures. |
| Operating junction temp. | –40 °C to +85 °C - qualified for industrial-grade portable and smart metering applications. |
Pinout & Package
STBB1-APUR is housed in a thermally enhanced DFN10 (3 × 3 mm) package with exposed power ground pad. The 10-pin layout separates power (VIN, VINA, PGND, SW1, SW2, VOUT) and signal (EN, MODE/SYNC, GND, FB) paths to suppress noise coupling.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 VOUT | Regulated output voltage node | Connects to output capacitor and load; requires low-ESR ceramic cap (≥22 µF) for ripple suppression. |
| 2 SW2 | Switch node (low-side) | Internal NMOS/PFET connection point; ties to one end of power inductor (L) in buck-boost bridge configuration. |
| 3 PGND | Power ground return | Low-impedance path for high di/dt switch currents; must be tied directly to exposed pad and thermal plane. |
| 4 SW1 | Switch node (high-side) | Internal NMOS/PFET connection point; ties to opposite end of inductor (L); forms 4-switch buck-boost topology. |
| 5 VIN | Main power input (switch side) | Supplies high-current path to internal switches; requires ≥10 µF ceramic bypass cap to PGND, placed adjacent to pin. |
| 6 EN | Enable control input | Logic-high (>1.2 V) enables regulation; logic-low (<0.4 V) disables all switches and reduces quiescent draw to <1 µA. |
| 7 MODE/SYNC | Mode selection & clock sync | Pulled low → auto PS/PWM mode; pulled high → forced PWM; driven with 1.3–2.0 MHz square wave → external sync. |
| 8 VINA | Analog supply for control circuitry | Independent 2.0–5.5 V rail for biasing error amp, oscillator, and logic; decoupled separately from VIN. |
| 9 GND | Signal ground reference | Reference for FB, EN, MODE/SYNC; routed separately from PGND to avoid noise injection into feedback loop. |
| 10 FB | Feedback input (0.5 V reference) | Monitors output via resistor divider; ZFB = 10 MΩ allows high-value resistors (≤500 kΩ) to minimize quiescent loss. |
Key Features
| Feature | Design Value |
|---|---|
| Average current mode control | Ensures stable loop response across full VIN/VOUT operating envelope-including buck-boost crossover region where VIN ≈ VOUT. |
| Integrated 4-switch topology | Eliminates need for external H-bridge; dual N+P MOSFETs with RDS(on) ≤ 0.35 Ω reduce conduction loss and improve efficiency >94%. |
| Programmable dual-mode operation | Auto PS/PWM mode cuts light-load IQ to 160–250 µA; forced PWM mode maintains 1.5 MHz switching for fast transient response. |
| Comprehensive protection suite | Includes soft-start (400 mA initial current limit), UVLO (1.5–1.8 V hysteresis), thermal shutdown (140 °C), and short-circuit limiting. |
| Split power/signal ground architecture | VIN/PGND handles high di/dt switch currents; VINA/GND isolates sensitive analog blocks-reducing noise-induced regulation error. |
Applications
| Smart Metering System | IoT Sensor Module |
|---|---|
Use Scenario: Battery-powered utility meter with RF mesh communication and real-time clock, operating over 10-year field life. IC Role / Device Role / Timing Role: Primary buck-boost regulator supplying 3.3 V to MCU, radio, and RTC from declining 3×AA alkaline stack (4.5 V → 3.0 V). Use Value: Maintains regulated 3.3 V output down to 2.0 V input, enabling full battery utilization without brownout; PS mode extends shelf life. |
Use Scenario: Ultra-low-power environmental sensor node powered by coin cell or small Li-SOCl₂ battery. IC Role / Device Role / Timing Role: Single-inductor power manager delivering 1.8 V or 3.3 V to ultra-low-IQ microcontroller and BLE transceiver. Use Value: Shutdown current <1 µA preserves battery during multi-week sleep cycles; burst-mode PS operation minimizes idle loss. |
| SD/MMC Memory Card Supply | Portable Medical Device |
Use Scenario: Embedded SD card interface in handheld diagnostic tool requiring stable 3.3 V supply independent of main system rail. IC Role / Device Role / Timing Role: Dedicated point-of-load regulator for SDIO bus, isolated from noisy main processor domain. Use Value: Low-noise PWM mode ensures clean 3.3 V rail for high-speed data transfer; split GND design prevents digital noise coupling. |
Use Scenario: Handheld glucose monitor using single Li-Ion cell with display, sensor interface, and Bluetooth LE. IC Role / Device Role / Timing Role: Main power converter supplying 3.3 V to MCU and 1.8 V to analog front-end via LDO post-regulation. Use Value: Wide 2.0–5.5 V input accommodates full Li-Ion discharge (4.2 V → 2.7 V); thermal shutdown protects against enclosure overheating. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck-boost DC-DC converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Texas Instruments TPS63020DSJR | Fixed 3.3 V output only; no adjustable version; 2.5 A peak current; 3.2 MHz switching; smaller 2 × 2 mm QFN. | Lacks MODE/SYNC pin for dual-mode control or external sync; unsuitable where programmable PS/PWM transition is required. | Select if fixed 3.3 V output suffices and board space is constrained; verify thermal performance at 1.5 A continuous load. |
| Analog Devices LT8330EDDB#TRMPBF | Single-switch boost-only topology; requires external Schottky diode; 2.5 A switch; 2 MHz max frequency; no integrated buck-boost capability. | Cannot regulate when VIN > VOUT (buck operation); not viable for single-cell Li-Ion systems needing buck-boost crossover. | Use only in pure boost applications (e.g., 1.5 V → 3.3 V); avoid where input may exceed output voltage during battery charge cycles. |
Compared with TPS63020DSJR and LT8330EDDB#TRMPBF, STBB1-APUR uniquely supports true buck-boost operation with dual-mode control, 4-switch integration, and split power/signal grounds-making it the only choice for battery-powered systems requiring seamless regulation across full input voltage range without external diodes or complex compensation.
Availability
STBB1-APUR is available at Aetrix Electronics and suitable for smart metering systems, IoT sensor modules, and portable medical devices requiring stable component supply across extended product lifecycles and varying environmental conditions.
Supply support for STBB1-APUR includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
STMicroelectronics is a global semiconductor leader headquartered in Geneva, specializing in power management, microcontrollers, and analog ICs for industrial, automotive, and consumer markets.
The STBB1-AXX product line targets battery-constrained portable electronics, delivering high-efficiency, single-inductor buck-boost conversion with intelligent mode control and robust protection for long-life embedded deployments.
FAQ
What is the minimum recommended inductor value for STBB1-APUR in a 3.3 V output application?
The minimum inductor is determined by worst-case boundary conditions: LMIN–BUCK at VINMAX and LMIN–BOOST at VINMIN. For VIN = 2.0–5.5 V and VOUT = 3.3 V, ST recommends 2.2 µH (e.g., TDK VLCF4020T-2R2N1R7). Inductor saturation current must exceed 2.3 A peak, and DCR should be minimized to preserve efficiency.
How does the MODE/SYNC pin affect efficiency and transient response?
When MODE/SYNC is low, the device enters power-save (burst) mode at light loads, reducing IQ to ~250 µA and improving light-load efficiency-but increasing output voltage ripple and slowing load-step response. When high, it forces fixed-frequency PWM, ensuring consistent 1.5 MHz switching, lower ripple, and <10 µs transient recovery-ideal for RF or sensor circuits.
Can STBB1-APUR drive a 500 mA continuous load at 3.3 V output from a 2.5 V input?
Yes-Figure 8 in DS8642 shows >2.5 A pulsed output capability at VIN = 2.5 V and VOUT = 3.3 V. Continuous 500 mA is well within thermal limits: at 94% efficiency, power dissipation is ~180 mW, and with RTHJA = 30.9 °C/W, junction rise is ~5.5 °C-well below 140 °C shutdown threshold.
Is the exposed pad on the DFN10 package electrically connected, and how should it be handled in PCB layout?
Yes-the exposed pad is internally connected to PGND and must be soldered to a dedicated thermal pad on the PCB. ST recommends a 2×2 array of thermal vias (minimum 4×0.3 mm) connecting to an internal ground plane. This reduces RTHJC to 2.96 °C/W and prevents thermal throttling during sustained 1.5 A operation.
STBB1-APUR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- -
- Package/Case:
- 10-VFDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Step-Up/Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck-Boost
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 2V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 1.2V
- Voltage - Output (Max):
- 5.5V
- Current - Output:
- 1.6A (Switch)
- Frequency - Switching:
- 1.5MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 85°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 10-DFN (3x3)
STBB1-APUR FAQ
1.How can I place an order for STBB1-APUR through Aetrix?
Please submit a Request for Quotation (RFQ) for STBB1-APUR on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for STBB1-APUR reliable?
The price and inventory of STBB1-APUR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STBB1-APUR is usually 5 days.
3.What payment methods are accepted for STBB1-APUR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STBB1-APUR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for STBB1-APUR?
STBB1-APUR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your STBB1-APUR order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for STBB1-APUR?
For technical support, including STBB1-APUR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STBB1-APUR requirements.
6.How does Aetrix verify that STBB1-APUR is sourced from the original manufacturer or authorized distributors?
All STBB1-APUR products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that STBB1-APUR meets industry standards.
7.What is the process for return or replacement of STBB1-APUR?
All STBB1-APUR units undergo pre-shipment inspection (PSI). If there is an issue with STBB1-APUR, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The STBB1-APUR part is unused and in its original packaging.
Return procedure for STBB1-APUR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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