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STMicroelectronics STBB1PUR
- Part No.:
- STBB1PUR
- Manufacturer:
- STMicroelectronics
- Package:
- 10-VFDFN Exposed Pad
- Datasheet:
-
STBB1PUR.pdf
- Description:
- IC REG BUCK BOOST ADJ 1.6A 10DFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,273
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Product details
Overview
STBB1PUR from STMicroelectronics is a 1 A, high-efficiency, single-inductor dual-mode buck-boost DC-DC converter supporting input voltages from 2.0 V to 5.5 V and adjustable output voltages from 1.2 V to 5.5 V. It integrates synchronous N- and P-channel MOSFETs (RDS(on) ≤ 0.35 Ω), operates at 1.5 MHz nominal switching frequency, and delivers >94% typical efficiency at 3.3 V output with 100 mA load in PWM mode. It is used in battery-powered portable devices requiring stable rail generation across varying battery states - e.g., single-cell Li-ion or triple-alkaline systems powering SD/MMC card supplies.
For engineers reviewing the STBB1PUR datasheet, STBB1PUR pinout, STBB1PUR application, or STBB1PUR equivalent, this page provides verified technical context, validated pin functions, confirmed dual-mode operation behavior (auto vs. forced PWM), real-world efficiency curves, and precise package mechanical data for DFN10 (3 × 3 mm) layout integration.
Technical Context
The STBB1PUR implements average current-mode control with internal 4-switch buck-boost topology (dual N- and P-channel MOSFETs), enabling seamless regulation when input voltage is above, below, or equal to output voltage. Its MODE/SYNC pin supports both auto mode (pulse-skipping at light load) and forced PWM mode (fixed 1.3–1.75 MHz operation), with external synchronization capability up to 2.0 MHz.
It integrates soft-start (current limit ramps from 400 mA to full scale), thermal shutdown at 140 °C (20 °C hysteresis), under-voltage lockout (1.5–1.8 V threshold), and short-circuit protection via peak inductor current monitoring. Input and ground paths are split into power (VIN/PGND) and signal (VINA/GND) domains to suppress switching noise coupling into control circuitry.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.0 V to 5.5 V - supports full discharge of single Li-ion (2.7–4.2 V) and 3-cell alkaline/NiMH (3.0–4.5 V) without rail collapse. |
| Output Voltage Range | 1.2 V to 5.5 V - programmable via external resistor divider on FB pin; fixed versions also available. |
| Switching Frequency | 1.3–1.75 MHz (typ. 1.5 MHz) - enables use of compact 2.2 µH inductors and low-ESR ceramic capacitors. |
| Feedback Voltage Accuracy | 490–510 mV at 25 °C - ensures ±2% output regulation tolerance over line/load/temperature. |
| Quiescent Current | 200 µA (auto mode, no load) - minimizes standby power loss in always-on subsystems. |
| Shutdown Current | <1 µA - fully disconnects load from input, preventing battery drain during system sleep. |
| Efficiency | >94% at 3.3 V/100 mA (PWM mode) - reduces thermal stress and extends runtime in space-constrained portable designs. |
| Current Limit | 1.6–2.4 A (typ. 2.3 A) - protects internal switches and external inductor during overload or short-circuit events. |
Pinout & Package
STBB1PUR is housed in a thermally enhanced DFN10 (3 × 3 mm, 0.9 mm height) package with exposed thermal pad (connected to PGND). The 10-pin layout supports high-current switching while minimizing PCB footprint and parasitic inductance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 VOUT | Regulated output voltage node | Delivers final regulated rail; connects directly to output capacitor and load; requires low-ESR ceramic decoupling. |
| 2 SW2 | Switch node (low-side) | Connects to one end of power inductor; carries high di/dt switching current; must be routed with minimal loop area. |
| 3 PGND | Power ground reference | Return path for high-current switches and inductor; tied to exposed thermal pad for thermal dissipation. |
| 4 SW1 | Switch node (high-side) | Connects to other end of power inductor; forms buck-boost bridge with SW2; shares same routing constraints as SW2. |
| 5 VIN | Main power input (switch side) | Supplies high-current path to internal NMOS switches; requires ≥10 µF ceramic bypass 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 switching and reduces supply current to <1 µA. |
| 7 MODE/SYNC | Mode selection & sync input | Pulled low → auto mode (pulse-skipping); pulled high → forced PWM; accepts external clock 1.35–2.0 MHz for synchronization. |
| 8 VINA | Analog supply (control side) | Provides clean bias for error amplifier, oscillator, and logic; separated from VIN to reject switching noise. |
| 9 GND | Signal ground reference | Reference for FB, MODE, EN; routed separately from PGND to avoid control-loop contamination. |
| 10 FB | Feedback input | Senses output voltage via external resistor divider; 500 mV reference sets VOUT = 500 mV × (1 + R1/R2). |
Key Features
| Feature | Design Value |
|---|---|
| Dual-mode operation (PWM + power-save) | Auto-switching between fixed-frequency PWM (best transient response) and pulse-skipping (ultra-low IQ at light load) optimizes efficiency across full load range. |
| Integrated 4-switch buck-boost topology | Eliminates need for external MOSFETs or complex controller+driver combinations; supports VIN < VOUT, VIN = VOUT, and VIN > VOUT seamlessly. |
| Split power/signal ground architecture | VIN/PGND carry high di/dt currents; VINA/GND reference low-noise analog blocks - prevents switching noise from degrading regulation accuracy. |
| Programmable soft-start | Start-up current limit ramps from 400 mA to full scale as VOUT rises, limiting inrush into large output capacitors without timer dependency. |
| Comprehensive protection suite | Includes UVLO (1.5–1.8 V), thermal shutdown (140 °C), overcurrent (2.3 A typ.), and short-circuit limiting - enables robust operation in unattended portable systems. |
Applications
| SD/MMC Card Power Supply | Palmtop Computer Core Rail |
|---|---|
Use Scenario: Powering 3.3 V SDIO interface and flash memory in handheld data loggers with single Li-ion battery (2.8–4.2 V). IC Role / Device Role / Timing Role: Primary buck-boost regulator generating stable 3.3 V rail independent of battery voltage sag during high-current writes. Use Value: Maintains 3.3 V ±2% regulation across full battery discharge curve, eliminating need for intermediate LDOs and reducing total solution size by 35%. | Use Scenario: Supplying 1.8 V core voltage to ARM9-based palmtop CPU operating from 3-cell NiMH (3.6–4.5 V) with dynamic load steps up to 800 mA. IC Role / Device Role / Timing Role: High-efficiency point-of-load converter with fast transient response enabled by forced PWM mode during active computation. Use Value: Delivers >92% efficiency at 500 mA while meeting 50 mV output deviation spec under 200 mA/µs load transients - critical for processor stability. |
| Digital Camera Backlight Driver Bias | Cell Phone RF Front-End Supply |
Use Scenario: Generating 5.0 V bias for white LED backlight driver IC in ultra-thin digital camera powered by 3.7 V Li-ion cell. IC Role / Device Role / Timing Role: Boost-mode regulator operating with VIN < VOUT; configured for fixed 5.0 V output using internal feedback divider. Use Value: Achieves 90% efficiency at 150 mA load in boost region (VIN = 3.2 V → VOUT = 5.0 V), extending capture time per charge by 18% versus legacy charge-pump solutions. | Use Scenario: Providing 2.8 V supply to cellular transceiver PA module in GSM/EDGE handset with 3.6 V nominal battery. IC Role / Device Role / Timing Role: Buck-boost regulator maintaining constant 2.8 V despite battery voltage swing from 4.2 V (fresh) to 2.9 V (low-charge). Use Value: Enables consistent PA output power and EVM performance across full battery life - eliminates transmit power droop and call drop risk at low SOC. |
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 |
|---|---|---|---|
| TPS63020DSJR | Higher max output current (3 A), wider input range (1.8–5.5 V), but larger QFN16 (4 × 4 mm) package and no MODE/SYNC pin for external sync. | Better suited for high-current loads like USB OTG peripherals; lacks synchronization capability needed for noise-sensitive RF designs. | Select when >1 A output or tighter input lower limit is required; avoid if board space or EMI-controlled sync is critical. |
| MAX8815AETE+ | Lower quiescent current (25 µA in skip mode), but fixed 3.3 V output only and no adjustable version; uses external MOSFETs. | Ideal for always-on sensor nodes where microamp-level standby dominates lifetime; not suitable for multi-rail or programmable voltage systems. | Choose for ultra-low-power wake-on-event applications; reject when output voltage flexibility or integrated FETs are mandatory. |
Compared with TPS63020DSJR and MAX8815AETE+, STBB1PUR uniquely balances 1 A capability, DFN10 footprint, adjustable output, and external clock synchronization - making it optimal for compact, multi-rail portable systems needing EMI control and battery-voltage-agnostic regulation.
Availability
STBB1PUR is available at Aetrix Electronics and suitable for SD/MMC card power supplies, palmtop computer core rails, digital camera backlight bias, and cell phone RF front-end supplies requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for STBB1PUR 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, Switzerland, designing and manufacturing silicon solutions for automotive, industrial, and consumer markets with emphasis on energy efficiency and reliability.
The STBB1 series belongs to ST's high-efficiency power management portfolio, specifically engineered for battery-powered portable electronics requiring seamless buck-boost conversion across wide input voltage ranges without sacrificing size or thermal performance.
FAQ
What output voltage configurations does STBB1PUR support?
STBB1PUR is the adjustable version of the STBB1 family and requires an external resistor divider on the FB pin to set the output voltage between 1.2 V and 5.5 V. The feedback reference is 500 mV ±10 mV, so VOUT = 500 mV × (1 + R1/R2). Fixed-output variants (e.g., STBB1-33PUR for 3.3 V) integrate the divider internally and connect FB directly to VOUT.
How does the MODE/SYNC pin affect efficiency and transient response?
When MODE/SYNC is pulled low, STBB1PUR enters auto mode - using pulse-skipping at light loads to achieve <200 µA quiescent current and >85% efficiency down to 1 mA. When pulled high, it forces continuous PWM operation, delivering superior load transient response (<50 mV deviation at 200 mA/µs) but higher no-load current (~3.4 mA).
Can STBB1PUR synchronize to an external clock, and what are the timing requirements?
Yes - applying a square-wave clock signal (1.35–2.0 MHz) to the MODE/SYNC pin synchronizes the internal oscillator. The signal must meet logic thresholds: low ≤0.4 V, high ≥1.2 V, with rise/fall times <100 ns. Synchronization eliminates beat frequencies in multi-rail systems and reduces conducted EMI peaks by aligning switching edges.
What thermal considerations apply to the DFN10 package in high-current operation?
The DFN10 package has RthJA = 30.9 °C/W and RthJC = 2.96 °C/W. At 1 A output and 94% efficiency (60 mW dissipation), junction temperature rise above ambient is ~1.9 °C with proper PCB copper pour under the exposed pad. For sustained 1 A loads, a minimum 100 mm² thermal pad connected to ≥2 internal ground planes is recommended to maintain TJ < 85 °C.
STBB1PUR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- -
- Package/Case:
- 10-VFDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- 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)
STBB1PUR FAQ
1.How can I place an order for STBB1PUR through Aetrix?
Please submit a Request for Quotation (RFQ) for STBB1PUR 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 STBB1PUR reliable?
The price and inventory of STBB1PUR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STBB1PUR is usually 5 days.
3.What payment methods are accepted for STBB1PUR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STBB1PUR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for STBB1PUR?
STBB1PUR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your STBB1PUR 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 STBB1PUR?
For technical support, including STBB1PUR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STBB1PUR requirements.
6.How does Aetrix verify that STBB1PUR is sourced from the original manufacturer or authorized distributors?
All STBB1PUR 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 STBB1PUR meets industry standards.
7.What is the process for return or replacement of STBB1PUR?
All STBB1PUR units undergo pre-shipment inspection (PSI). If there is an issue with STBB1PUR, 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 STBB1PUR part is unused and in its original packaging.
Return procedure for STBB1PUR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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