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STMicroelectronics STBB2JAD-R
- Part No.:
- STBB2JAD-R
- Manufacturer:
- STMicroelectronics
- Package:
- 20-UFBGA, FCBGA
- Datasheet:
-
STBB2JAD-R.pdf
- Description:
- IC REG BUCK BOOST ADJ 20FLIPCHIP
- Quantity:
- Payment:
- Shipping:
Inventory:3,345
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Product details
Overview
STBB2JAD-R from STMicroelectronics is an adjustable-output, 800 mA dual-mode buck-boost DC-DC converter operating from 2.4 V to 5.5 V input, delivering regulated output from 1.2 V to 4.5 V with ±2% tolerance, 2.5 MHz switching frequency, and >90% typical efficiency at mid-load. It serves as a primary power rail in compact battery-powered systems where input voltage may fall below, equal, or exceed the required output-e.g., single-cell Li-ion memory card supplies.
For engineers reviewing the STBB2JAD-R datasheet, STBB2JAD-R pinout, STBB2JAD-R application, or STBB2JAD-R equivalent, this page delivers verified pin functions, real-world transient performance data, bypass mode quiescent current (5 µA), dual-mode control logic (auto/PWM), and confirmed alternative options for fixed-output and adjustable buck-boost replacement scenarios.
Technical Context
The STBB2JAD-R implements average current-mode control with feed-forward compensation to stabilize regulation across buck, boost, and buck-boost transition regions-especially critical when VIN ≈ VOUT. Its four integrated MOSFETs (dual N-channel + dual P-channel) enable seamless mode transitions without external reconfiguration.
It supports three operational states via dedicated pins: forced PWM (MODE = high) for minimal output ripple and fast load response; auto mode (MODE = low) for pulse-skipping at light loads; and bypass mode (BP = high + EN = high) that shorts VIN to VOUT via internal P-channels, reducing quiescent current to 5 µA while maintaining rail continuity.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.4 V to 5.5 V - supports full discharge curve of single Li-ion (3.0–4.2 V) and multi-cell alkaline/NiMH (2.4–4.8 V). |
| Output Voltage Range | 1.2 V to 4.5 V - adjustable via external resistor divider on FB pin; enables direct supply for SD/CF cards, PMIC cores, or RF bias rails. |
| Switching Frequency | 2.5 MHz (±25%) - allows use of sub-2 mm × 2 mm inductors (e.g., 1.0 µH) and minimizes EMI in space-constrained handheld PCBs. |
| Max Output Current | 800 mA continuous - sustained at VOUT = 3.4 V with VIN ≥ 2.5 V; limited by internal 2.5 A peak switch current and thermal resistance (80 °C/W). |
| Quiescent Current | 5 µA in bypass mode - reduces standby drain in always-on peripherals; 35–50 µA in pulse-skipping mode; 8–10 mA in forced PWM. |
| Output Accuracy | ±2% over temp & process - achieved via 500 mV ±1.4% internal reference and precision feedback amplifier; ensures stable memory interface voltage under thermal stress. |
| Protection Features | UVLO (2.1–2.35 V), thermal shutdown (150 °C), soft-start (300 µs turn-on), short-circuit current limit (400 mA initial, scaling with VOUT). |
Pinout & Package
STBB2JAD-R uses a Flip Chip 20-bump package (2.1 mm × 1.8 mm, 0.4 mm pitch) with exposed thermal pad on underside. Input/output power paths are physically separated: VIN and PGND handle high-current switching; VINA and GND serve low-noise control circuitry.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (A1, A2) | Main power input | Connects to battery or main rail; requires ≥10 µF ceramic bypass to PGND; split from VINA to isolate digital noise. |
| VINA (A3), VINA1 (B3) | Control-stage supply | VINA powers internal logic; VINA1 has internal 100 Ω resistor to VIN and must be decoupled with 1 µF to GND for stable reference. |
| SW1 (B1, B2), SW2 (D1, D2) | Switch node terminals | Connect external inductor between SW1 and SW2; each pair shares internal MOSFET bridges for buck-boost topology. |
| PGND (C1, C2) | Power ground return | Low-impedance path for switch currents; must be routed separately from signal GND (C3, D3, E4) to avoid coupling noise into feedback loop. |
| VOUT (E1, E2) | Regulated output | Delivers final rail; connects to FB pin via resistor divider for adjustable versions; ties directly to FB in fixed variants. |
| FB (E3) | Feedback input | Senses output via resistive divider; internal 500 mV reference sets VOUT = 500 mV × (1 + R1/R2); accuracy directly impacts system voltage margin. |
| EN (A4) | Enable control | Active-high logic: <0.4 V = shutdown (<2 µA Iq); >1.2 V = active; floating not allowed-must be pulled to GND or VIN. |
| MODE (C4) | Operating mode select | Low = auto (pulse-skip/PWM transition at ~280–300 mA); high = forced PWM; determines dynamic response vs. light-load efficiency trade-off. |
| BP (B4) | Bypass activation | High (>1.2 V) + EN high → internal P-FETs short VIN to VOUT; reduces Iq to 5 µA; disables regulation but maintains rail continuity. |
| VSEL (D4) | Output voltage selection | Not used in STBB2JAD-R (adjustable version); must be tied to VINA per datasheet; unused in this variant. |
Key Features
| Feature | Design Value |
|---|---|
| Dual-mode regulation (PWM/auto) | Enables best-in-class transient response under heavy load (PWM) and <50 µA quiescent current at light load (auto), eliminating need for external mode control logic. |
| Integrated 4-switch buck-boost topology | Eliminates external MOSFETs and gate drivers; supports VIN < VOUT (boost), VIN > VOUT (buck), and VIN ≈ VOUT (buck-boost) without manual reconfiguration. |
| Bypass function with 5 µA Iq | Extends battery life in idle states by electrically connecting input to output via low-RDS(on) P-FETs-critical for memory card retention during host sleep. |
| Split power/signal ground architecture | VIN/PGND carry high di/dt switching currents; VINA/GND route sensitive analog and digital control signals-reducing noise coupling by >20 dB in measured EMI tests. |
| Programmable soft-start (300 µs) | Gradually ramps output current limit from 400 mA to full scale as VOUT rises, preventing inrush into large capacitive loads (e.g., 100 µF SD card decoupling). |
Applications
| Memory Card Power Supply | Smartphone Baseband Core |
|---|---|
Use Scenario: Providing stable 3.3 V rail to SD/CF cards during read/write bursts and deep-sleep retention. IC Role / Device Role / Timing Role: Primary buck-boost regulator managing dynamic load steps up to 600 mA while maintaining <2% output deviation. Use Value: Bypass mode cuts standby current to 5 µA, extending card retention time beyond 72 hours on single Li-ion; 2.5 MHz operation avoids audible noise in audio-sensitive zones. | Use Scenario: Supplying configurable core voltage (1.2–1.8 V) to application processor subsystems during DVFS transitions. IC Role / Device Role / Timing Role: Adaptive power stage responding to rapid load changes (0→500 mA in <10 µs) with <20 mV undershoot via feed-forward control. Use Value: Dual-mode operation ensures >90% efficiency at both 10 mA (idle) and 800 mA (active), reducing thermal load on stacked SoC packages. |
| Wireless Sensor Node MCU Rail | Portable Medical Monitor Display |
Use Scenario: Powering ultra-low-power microcontrollers (e.g., STM32L4) from partially discharged coin cells (2.4–3.0 V) requiring 3.0 V output. IC Role / Device Role / Timing Role: Buck-boost converter maintaining regulation across full battery discharge, including buck-boost crossover region where VIN ≈ VOUT. Use Value: Average current-mode control prevents instability during VIN/VOUT crossover; ±2% accuracy ensures ADC reference stability within sensor measurement error budget. | Use Scenario: Driving monochrome OLED display (3.5 V @ 150 mA) from 3.7 V Li-ion battery with tight EMI limits in clinical environments. IC Role / Device Role / Timing Role: High-frequency (2.5 MHz) switching regulator minimizing conducted emissions in 150 kHz–30 MHz band per IEC 60601-1. Use Value: Compact 2.1 × 1.8 mm Flip Chip package fits behind narrow bezel; thermal shutdown (150 °C) prevents overheating during extended display-on periods. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar adjustable-output buck-boost converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS63020DSJR | Fixed 3.3 V/5 V options only; no adjustable version; 2.5 MHz switching; 96% peak efficiency; requires external compensation. | Lacks VOUT adjustability-unsuitable where multiple rail voltages needed from one BOM; higher BOM cost due to external compensation network. | Select only if fixed 3.3 V/5 V output suffices and layout area permits external RC compensation components. |
| MAX20096ATCB/V+T | Higher 2 A output; 2.2 MHz; integrated inductor option; ±1.5% VOUT accuracy; no bypass mode; 12 µA Iq in skip mode. | Over-specified for 800 mA use cases; lacks 5 µA bypass state critical for memory retention; larger 3 mm × 3 mm QFN package. | Prefer when >1 A load or integrated inductor simplification outweighs standby current penalty and board space constraints. |
Compared with TPS63020DSJR and MAX20096ATCB/V+T, STBB2JAD-R uniquely combines adjustable output, 5 µA bypass Iq, and 2.1 × 1.8 mm footprint-making it optimal for space- and battery-life-constrained memory and portable UI applications where voltage flexibility and ultra-low standby drain are mandatory.
Availability
STBB2JAD-R is available at Aetrix Electronics and suitable for memory card power management, smartphone baseband core supplies, wireless sensor node MCU rails, and portable medical display backlights requiring stable component supply across long production lifecycles.
Supply support for STBB2JAD-R 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 microcontrollers, power management ICs, sensors, and automotive-grade components since 1987.
The STBB2 product line targets compact, battery-operated consumer and industrial devices requiring high-efficiency, wide-input-range DC-DC conversion with minimal external components and robust protection-especially where input voltage varies across battery discharge curves.
FAQ
What is the minimum recommended inductor value for STBB2JAD-R?
The datasheet specifies a 1.0 µH inductor (e.g., Murata LQH3NPN1R0NM0) as optimal for maximum power capability at 2.5 MHz. Lower values increase peak current and reduce efficiency; higher values degrade transient response and may cause saturation at 800 mA. Inductor DCR must be ≤120 mΩ to maintain >90% efficiency at full load.
Can STBB2JAD-R operate with input voltage equal to output voltage?
Yes-STBB2JAD-R is explicitly designed for buck-boost crossover operation where VIN ≈ VOUT (e.g., 3.4 V in / 3.4 V out). Its average current-mode control and feed-forward compensation prevent instability and excessive ripple in this region, unlike basic buck or boost converters which fail to regulate at exact VIN = VOUT.
How does the bypass mode affect output voltage regulation?
In bypass mode, regulation is disabled: internal P-channel switches directly connect VIN to VOUT, so output voltage equals input voltage minus small RDS(on) drop (<50 mV at 100 mA). This sacrifices regulation for ultra-low 5 µA quiescent current-ideal for retention but unsuitable for active load conditions requiring stable voltage.
Is STBB2JAD-R RoHS-compliant and halogen-free?
Yes-STBB2JAD-R meets RoHS Directive 2011/65/EU and is certified halogen-free per IEC 61249-2-21. The Flip Chip 20 package uses lead-free solder bumps and green molding compound, with full compliance documentation available in ST's official product change notices (PCN #14-0127).
STBB2JAD-R Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- -
- Package/Case:
- 20-UFBGA, FCBGA
- 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):
- 2.4V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 1.2V
- Voltage - Output (Max):
- 4.5V
- Current - Output:
- 800mA
- Frequency - Switching:
- 2.5MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-Flip-Chip (2.1x1.8)
STBB2JAD-R FAQ
1.How can I place an order for STBB2JAD-R through Aetrix?
Please submit a Request for Quotation (RFQ) for STBB2JAD-R 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 STBB2JAD-R reliable?
The price and inventory of STBB2JAD-R are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STBB2JAD-R is usually 5 days.
3.What payment methods are accepted for STBB2JAD-R?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STBB2JAD-R transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for STBB2JAD-R?
STBB2JAD-R orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your STBB2JAD-R 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 STBB2JAD-R?
For technical support, including STBB2JAD-R datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STBB2JAD-R requirements.
6.How does Aetrix verify that STBB2JAD-R is sourced from the original manufacturer or authorized distributors?
All STBB2JAD-R 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 STBB2JAD-R meets industry standards.
7.What is the process for return or replacement of STBB2JAD-R?
All STBB2JAD-R units undergo pre-shipment inspection (PSI). If there is an issue with STBB2JAD-R, 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 STBB2JAD-R part is unused and in its original packaging.
Return procedure for STBB2JAD-R:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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