Lemontree

38V, 0.5A synchronous step-down switching regulator evaluation board based on A6985F

STEVAL-ISA187V1

Overview

The STEVAL-ISA187V1 is a product evaluation board based on the ST synchronous step-down switching regulator A6985F, 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, represents 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 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 at V_IN=12 V and V_OUT= 3.3 V that ensures high efficiency under light load, which is a requirement in typical car body applications that are active when a car is parked. 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 I_SKIP current and the switchover feature enabled, but all of these settings can be easily changed so the user can evaluate different application scenarios.

Main 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 I _SKIP current
30 μA I_Q at light load (LCM V_IN = 12 V and V_OUT =3.3 V)
8 μA I_Q-SHTDWN
Adjustable f_SW (250 kHz - 2 MHz)
Output voltage adjustable from 0.85 V to V_IN
Embedded output voltage supervisor

Synchronization
Adjustable soft-start time
Internal current limiting
Overvoltage protection
Output voltage sequencing
Peak current mode architecture
R_DS(on)HS = 360 mΩ; R_DS(on)LS = 150 mΩ
Thermal shutdown
RoHS compliant

Design Files

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It is your responsibility to test the circuit yourself and determine its suitability for you. EEWorld will not be liable for direct, indirect, special, incidental, consequential or punitive damages arising from any cause or anything connected to any reference design used.

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Update:2025-06-20 13:35:35

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