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STMicroelectronics STEVAL-ISA109V1
- Part No.:
- STEVAL-ISA109V1
- Manufacturer:
- STMicroelectronics
- Package:
- Datasheet:
-
STEVAL-ISA109V1.pdf
- Description:
- EVAL BOARD FOR STBB2
- Quantity:
- Payment:
- Shipping:
Inventory:1,740
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Product details
Overview
STEVAL-ISA109V1 from STMicroelectronics is an evaluation board for the STBB2 800 mA, 2.5 MHz dual-mode buck-boost DC-DC converter. It implements a complete power supply solution with adjustable or fixed output (2.9 V/3.4 V or 3.0 V/3.3 V), supports input range 2.4–5.5 V, delivers ±2% output voltage accuracy, and enables bypass mode with ≤5 µA quiescent current - designed for memory card and cellular phone power rails.
For engineers reviewing the STEVAL-ISA109V1 datasheet, STEVAL-ISA109V1 pinout, STEVAL-ISA109V1 application, or STEVAL-ISA109V1 equivalent, this page provides verified board-level specifications, supported IC configuration modes (auto/PWM/bypass), external component selection guidance (inductor, input/output capacitors), thermal layout notes, and direct reference to ST's official evaluation schematic and block diagram.
Technical Context
The STEVAL-ISA109V1 implements the STBB2 in Flip Chip 20-bump (2.1 × 1.8 mm) package, configured for both fixed-output (via VSEL pin) and adjustable-output (via FB resistor divider) operation. It validates dual-mode control logic: MODE pin selects auto (pulse-skipping + PWM) or forced PWM; BP pin enables battery-sparing bypass mode where internal P-channel switches directly connect VIN to VOUT.
Board-level design incorporates critical protection features confirmed in ST's documentation: undervoltage lockout (UVLO threshold 2.1–2.35 V), thermal shutdown (150 °C, 20 °C hysteresis), soft-start with proportional current limiting (400 mA initial limit), and short-circuit current limiting. Layout follows ST-recommended guidelines including split power/signal ground (PGND/GND), dedicated VINA/VINA1 decoupling, and optimized high-frequency switching node routing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supported IC | STBB2 buck-boost converter (order codes: STBB2JAD-R, STBB2J29-R, STBB2J30-R) |
| Input Voltage Range | 2.4 V to 5.5 V - matches single Li-ion or multi-cell alkaline/NiMH battery systems |
| Output Options | Fixed: 2.9 V/3.4 V or 3.0 V/3.3 V (VSEL-controlled); Adjustable: 1.2–4.5 V (FB divider) |
| Switching Frequency | 2.5 MHz (±0.5 MHz) - enables compact 1.0 µH inductor and 0603-size ceramic capacitors |
| Bypass Mode Quiescent Current | ≤5 µA - achieved by direct VIN-to-VOUT path using internal P-channel MOSFETs |
| Efficiency | ≥90% at 150–800 mA (PWM mode, VIN = 3.6 V, VOUT = 3.4 V) per ST characterization data |
| Protection Features | UVLO (2.1–2.35 V), thermal shutdown (150 °C), soft-start, short-circuit current limit (400 mA initial) |
Availability
STEVAL-ISA109V1 is available at Aetrix Electronics and suitable for cellular phone power management, memory card supply, and portable industrial sensor modules requiring stable component supply, rapid prototyping validation, and production-ready layout reference.
Supply support for STEVAL-ISA109V1 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, specializing in power management, microcontrollers, analog ICs, and automotive-grade silicon.
The STEVAL-ISA109V1 belongs to ST's ST evaluation board product line, engineered to accelerate design-in of ST's DC-DC converters - specifically targeting battery-powered portable applications where input voltage may fall above, below, or near the required output rail.
FAQ
What is the purpose of the VINA and VINA1 pins on the STEVAL-ISA109V1 board?
VINA supplies regulated voltage to the STBB2's control circuitry, isolating sensitive analog blocks from noisy power-switching paths. VINA1 connects internally to VIN via a 100 Ω resistor and requires a 1 µF capacitor to GND to stabilize the control-stage supply - a layout requirement validated in ST's application schematic and thermal performance testing.
Can the STEVAL-ISA109V1 be used to evaluate both fixed and adjustable output versions of the STBB2?
Yes - the board supports both configurations. For fixed-output variants (e.g., STBB2J29-R), VSEL is routed to enable selection between 2.9 V and 3.4 V; for adjustable versions (e.g., STBB2JAD-R), the FB pin accepts an external resistor divider, and VSEL is tied to VINA as specified in ST's datasheet Section 7.4.
How does bypass mode function on the STEVAL-ISA109V1, and what design benefit does it provide?
Bypass mode activates when EN = high and BP = high, closing internal P-channel switches to directly connect VIN to VOUT through the inductor. This eliminates switching losses and reduces quiescent current to ≤5 µA - extending battery life during idle or low-power states in cellular handsets and memory cards.
What external components are pre-installed and validated on the STEVAL-ISA109V1 board?
The board includes Murata GRM188R60J106M (10 µF, 0603) input/output capacitors, Murata LQH3NPN1R0NM0 (1.0 µH, 3×3×1.4 mm) inductor, and appropriate feedback resistors for fixed/adjustable modes - all selected per ST's Table 2 and validated in Figures 1–2 of the official datasheet for stability, transient response, and thermal performance.
STEVAL-ISA109V1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- -
- Packaging:
- Box
- Product Status:
- Obsolete
- Main Purpose:
- DC/DC, Step Up or Down
- Outputs and Type:
- 1 Non-Isolated Output
- Voltage - Output:
- -
- Current - Output:
- 3.3V
- Voltage - Input:
- 800mA
- Regulator Topology:
- 2.3V ~ 5.5V
- Frequency - Switching:
- Buck-Boost
- Contents:
- 3MHz
- Utilized IC / Part:
- Board(s)
- Power - Output:
- STBB2
STEVAL-ISA109V1 FAQ
1.How can I place an order for STEVAL-ISA109V1 through Aetrix?
Please submit a Request for Quotation (RFQ) for STEVAL-ISA109V1 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 STEVAL-ISA109V1 reliable?
The price and inventory of STEVAL-ISA109V1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STEVAL-ISA109V1 is usually 5 days.
3.What payment methods are accepted for STEVAL-ISA109V1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STEVAL-ISA109V1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for STEVAL-ISA109V1?
STEVAL-ISA109V1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your STEVAL-ISA109V1 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 STEVAL-ISA109V1?
For technical support, including STEVAL-ISA109V1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STEVAL-ISA109V1 requirements.
6.How does Aetrix verify that STEVAL-ISA109V1 is sourced from the original manufacturer or authorized distributors?
All STEVAL-ISA109V1 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 STEVAL-ISA109V1 meets industry standards.
7.What is the process for return or replacement of STEVAL-ISA109V1?
All STEVAL-ISA109V1 units undergo pre-shipment inspection (PSI). If there is an issue with STEVAL-ISA109V1, 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 STEVAL-ISA109V1 part is unused and in its original packaging.
Return procedure for STEVAL-ISA109V1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
STEVAL-ISA109V1 Tags
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