Product overview
Description
The STEVAL-85CY12V evaluation board is a step-down switching power supply based on the DCP85CY controller. It operates over an input voltage range from 5.5 to 85 V and supports a high-voltage conversion ratio at the switching frequency.
The STEVAL-85CY12V uses two external VTH MOSFETs and operates at 400 kHz. The switching frequency can be selected and synchronized with an external clock.
By using external jumpers, it is possible to easily select the output voltage (5 or 12 V), the light-load operating mode (diode emulation or forced PWM mode), the switch-over feature, and the turn on and off the system.
The maximum output is 15 A with Vout = 5 V, but it can reach 20 A by adjusting the OCP threshold and using light airflow.
With a single-row connector, it is possible to monitor external signals such as power-good and sync out, or to access drive signals for synchronization, dithering, enable, and soft-start functions. The STEVAL-85CY12V is based on the DCP85CY DC-DC step-down controller, a voltage-mode device in a QFN-20 package, 3.5 × 4.5 mm.
It offers selectable switching frequency, soft-start time, and overcurrent protection (hiccup mode), with current sensing based on the low-side RDS(on).
It also includes thermal monitoring and thermal shutdown at 175°C, enabling controlled and safe operation for automotive applications, unregulated 24 and 48 V input buses, and high-voltage battery to 12 and 5 V rails.
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All features
- AEC-Q100 Grade 1 qualified
- Wide 5.5 to 85 V input voltage range
- Step down (buck) conversion
- Selectable two output voltage level 5 or 12 V
- 15 A DC max output current (20 A with air flow)
- 400 kHz switching frequency setting selectable
- Pulse skipping or forced PWM operation at light load selectable
- Synchronization to external clock
- Voltage motor control loop
- Power-good open collector output validates VOUT
- Dithering with external clock
- Switch over selectable
- Constant current protection with hiccup mode
- Current sensing on rds-on LowSide
- Thermal protection
- Four layer board 100 x 80 mm
- Operating temperature range: -40°C to 150°C
- RoHS and China RoHS compliant
- WEEE compliant (2012/19/UE RAEE II)
Recommended for you
All resources
| Resource title | Version | Latest update | Actions | Details | Download |
|---|
Board Manufacturing Specifications (1)
| Resource title | Version | Latest update | Actions | Options | ||
|---|---|---|---|---|---|---|
| ZIP | 1.0 | 29 Oct 2026 | 29 Oct 2026 |
Bill of Materials (1)
| Resource title | Version | Latest update | Actions | Options | ||
|---|---|---|---|---|---|---|
| 1.0 | 29 Oct 2026 | 29 Oct 2026 |
Schematic Pack (1)
| Resource title | Version | Latest update | Actions | Options | ||
|---|---|---|---|---|---|---|
| 1.0 | 29 Oct 2026 | 29 Oct 2026 |
Quality and Reliability
| Part Number | Marketing Status | Package | Grade | RoHS Compliance Grade | WEEE Compliant | Longevity Commitment | Longevity Starting Date | Material Declaration** |
|---|---|---|---|---|---|---|---|---|
| STEVAL-85CY12V | Evaluation Product is under characterization. Limited Engineering samples available. EN | CARD | Industrial | Ecopack2 | Yes | - | - | |
STEVAL-85CY12V
Package:
CARDMaterial Declaration**:
(**) The Material Declaration forms available on st.com may be generic documents based on the most commonly used package within a package family. For this reason, they may not be 100% accurate for a specific device. Please contact our sales support for information on specific devices.
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Sample & Buy
| Part Number | Marketing Status | Budgetary Price (US$)*/Qty | Order from ST | Order from distributors | Package | Packing Type | RoHS | Country of Origin | ECCN (US) | ECCN (EU) | Supplier | Core Product | Board production status | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| STEVAL-85CY12V | | | distributors No availability of distributors reported, please contact our sales office |
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STEVAL-85CY12V Evaluation
(*) Suggested Resale Price (USD) per defined quantity for BUDGETARY USE ONLY. For quotes, prices in local currency, please contact your local ST Sales Office or our Distributors