ST – STEVAL-ISA185V1 – 38 V, 0.5 A synchronous step-down switching regulator evaluation board based on A6985F3V3
The STEVAL-ISA185V1 is a product evaluation board based on the ST synchronous step-down switching regulator A6985F3V3, which can deliver up to 0.5 A and, with its 100% duty cycle ability to withstand cold crank events and wide input operating voltage range, renders the A6985F3V3 the ideal choice for battery-powered automotive systems. Synchronous rectification helps achieve higher efficiency at full load as well as application compactness, while high-frequency switching (programmable up to 2 MHz) helps to reduce the cost and size of power passive components while remaining outside the AM band.
The device can operate in low consumption mode (LCM) with a quiescent current of 30 µA, hence ensuring the high efficiency under light load condition required in typical car body applications that are active during car parking. A low noise mode (LNM) can be selected to meet the requirements of infotainment applications with forced PWM mode under all load conditions.
The default board configuration is LCM active, 2 MHz switching frequency, high ISKIP current and the switchover feature enabled, but all of these settings can be easily changed so the user can evaluate different application scenarios.
Key Features
- AECQ100 qualification
- 0.5 A DC output current
- 4 V to 38 V operating input voltage
- Low consumption mode or low noise mode
- Programmable ISKIP current
- 30 μA IQ at light load (LCM VIN = 12 V)
- 8 μA IQ -SHTDWN
- Adjustable f SW (250 kHz – 2 MHz)
- Fixed output voltage VOUT = 3.3 V
- Embedded output voltage supervisor
- Synchronization
- Adjustable soft-start time
- Internal current limiting
- Overvoltage protection
- Output voltage sequencing
- Peak current mode architecture
- RDS(on)HS = 360 mΩ ; RDS(on)LS = 150 mΩ
- Thermal shutdown
- RoHS compliant
Link to the datasheet
Intern: ICPWM
