A6902D STMicroelectronics

A6902D Datasheet Up to 1 A step down switching regulator with adjustable current limit for automotive applications Features Qualified following the AEC-Q100 requirements Up to 1 A DC output current Operating input voltage from 8 V to 36 V Output voltage adjustable from 1.235 V to 35 V Precise 3.3 V (2 %) reference voltage 250 kHz Internally fixed frequency S O - 8 Voltage feedforward Zero-load current operation Internal current limiting Protection against feedback disconnection Thermal shutdown Applications Automotive applications Adjustable current generator Simple step-down converters with adjustable current limit Description The A6902D is a complete step down switching regulator with adjustable current Maturity status link limit. Based on a voltage mode structure it integrates an additional current error amplifier to implement both a constant voltage and constant current control. A6902D The current limit programming is very simple and accurate ( 5%) selecting the proper sensing resistor. The DC-DC converter can be used either as a voltage source with adjustable current limit (set by using the external sense resistor) or as current source to charge NiMH / NiCd batteries or drive voltage load like LEDs. The internal P-Channel DMOS transistor (typ. R 250 m) assures high DSON efficiency and minimum dropout even at high output current level. DS5503 - Rev 6 - October 2018 www.st.com For further information contact your local STMicroelectronics sales office.A6902D Pin description 1 Pin description Figure 1. Pin connection (top view) 8 OUT 1 VCC 7 CS+ 2 GND 6 CS- 3 VREF 5 COMP 4 FB Table 1. Pin description Pin n Name Description 1 OUT Regulator output. 2 CS+ Current error amplifier input (current sense at higher voltage) 3 CS- Current error amplifier input (current sense at lower voltage) 4 COMP E/A output for frequency compensation. Feedback input. Connecting directly to this pin results in an output voltage of 5 FB 1.23 V. An extenal resistive divider is required for higher output voltages. 6 VREF 3.3 V reference voltage. No cap is need for stability. 7 GND Ground. 8 VCC Unregulated DC input voltage. DS5503 - Rev 6 page 2/33