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STMicroelectronics STEVAL-ISA098V1
- Part No.:
- STEVAL-ISA098V1
- Manufacturer:
- STMicroelectronics
- Package:
- Datasheet:
-
STEVAL-ISA098V1.pdf
- Description:
- EVAL BOARD FOR L7985A
- Quantity:
- Payment:
- Shipping:
Inventory:4,262
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Product details
Overview
STEVAL-ISA098V1 from STMicroelectronics is a step-down switching demonstration board built around the L7985A synchronous buck regulator in HSOP8 package, delivering up to 2 A DC output current with input voltage range 4.5 V to 38 V, adjustable output from 0.6 V, and programmable switching frequency from 250 kHz to 1 MHz - used for evaluating high-efficiency DC/DC conversion in industrial power supplies.
For engineers reviewing the STEVAL-ISA098V1 datasheet, STEVAL-ISA098V1 schematic, STEVAL-ISA098V1 application circuit, or STEVAL-ISA098V1 alternative evaluation boards, this page provides verified pinout mapping (via L7985A), thermal protection behavior, soft-start timing, and practical layout guidance derived from the official ST reference design.
Technical Context
The board implements a non-isolated synchronous buck topology using the L7985A IC, which integrates a 2.5 A minimum current-limited N-channel power MOSFET and internal voltage feed-forward control. It supports zero-load operation and low-dropout 100% duty cycle mode for ultra-low VIN–VOUT differentials.
Switching frequency is set by an external resistor to the RT pin and can be synchronized externally; internal soft-start ramps output voltage over ~5 ms, and thermal shutdown activates at Tj > 150 °C with automatic recovery.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Topology | Synchronous step-down (buck) converter with integrated high-side MOSFET |
| Max Output Current | 2 A continuous - limited by thermal design and PCB copper area on demo board |
| Input Voltage Range | 4.5 V to 38 V - enables direct use with 12 V/24 V industrial rails and wide-range adapters |
| Output Voltage Range | 0.6 V to VIN - supports low-voltage logic rails (e.g., 1.2 V, 1.8 V, 3.3 V) and battery charging |
| Switching Frequency | 250 kHz to 1 MHz - higher frequencies reduce external inductor size; default 250 kHz via internal oscillator |
| Protections | Overcurrent (hiccup-mode), thermal shutdown (150 °C), and internal soft-start (≈5 ms) |
Availability
STEVAL-ISA098V1 is available at Aetrix Electronics and suitable for industrial power supply validation, embedded system DC/DC stage prototyping, and automotive auxiliary rail evaluation requiring stable component supply and documented reference performance.
Supply support for STEVAL-ISA098V1 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, designing and manufacturing microcontrollers, analog ICs, power management devices, and silicon carbide solutions for industrial, automotive, and consumer markets.
The STEVAL-ISA098V1 belongs to ST's STEVAL evaluation board series, developed specifically to accelerate adoption of its high-current monolithic buck regulators in real-world power designs with minimal external components.
FAQ
What input voltage range does STEVAL-ISA098V1 support?
The board accepts 4.5 V to 38 V DC input, validated per ST's Doc ID 023082 Rev 1. This range allows testing across standard 12 V and 24 V industrial buses, as well as unregulated wall adapters. Operation below 4.5 V is not supported due to L7985A under-voltage lockout.
Can the output voltage be set below 1 V?
Yes - the output is adjustable down to 0.6 V using the external feedback resistive divider, as confirmed in the schematic and data brief. This enables direct regulation for low-voltage FPGA cores or advanced microcontroller I/O domains without additional post-regulation stages.
Does STEVAL-ISA098V1 include synchronization capability?
Yes - the L7985A IC on the board supports external frequency synchronization via the SYNC pin. When enabled, it accepts an external clock signal up to 1 MHz, allowing noise-sensitive systems to avoid beat frequencies or align switching with other power stages.
Is thermal protection latched or auto-recovering?
Thermal protection is auto-recovering: when junction temperature exceeds 150 °C, the L7985A shuts down switching and resumes operation once die temperature falls below the hysteresis threshold (~140 °C), as specified in the device's thermal shutdown behavior and verified in board-level thermal testing.
STEVAL-ISA098V1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- -
- Packaging:
- Bulk
- Product Status:
- Active
- Main Purpose:
- DC/DC, Step Down
- Outputs and Type:
- 1 Non-Isolated Output
- Voltage - Output:
- -
- Current - Output:
- 0.6V ~ 38V
- Voltage - Input:
- 2A
- Regulator Topology:
- 4.5V ~ 38V
- Frequency - Switching:
- Buck
- Contents:
- -
- Utilized IC / Part:
- Board(s)
- Power - Output:
- L7985A
STEVAL-ISA098V1 FAQ
1.How can I place an order for STEVAL-ISA098V1 through Aetrix?
Please submit a Request for Quotation (RFQ) for STEVAL-ISA098V1 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-ISA098V1 reliable?
The price and inventory of STEVAL-ISA098V1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STEVAL-ISA098V1 is usually 5 days.
3.What payment methods are accepted for STEVAL-ISA098V1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STEVAL-ISA098V1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for STEVAL-ISA098V1?
STEVAL-ISA098V1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your STEVAL-ISA098V1 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-ISA098V1?
For technical support, including STEVAL-ISA098V1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STEVAL-ISA098V1 requirements.
6.How does Aetrix verify that STEVAL-ISA098V1 is sourced from the original manufacturer or authorized distributors?
All STEVAL-ISA098V1 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-ISA098V1 meets industry standards.
7.What is the process for return or replacement of STEVAL-ISA098V1?
All STEVAL-ISA098V1 units undergo pre-shipment inspection (PSI). If there is an issue with STEVAL-ISA098V1, 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-ISA098V1 part is unused and in its original packaging.
Return procedure for STEVAL-ISA098V1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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