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A6902D：Up to 1 A Switch Step Down regulator with Adjustable Current Limit for Automotive Applications

The A6902D is a complete and simple step down switching regulator with adjustable current limit. Based on a voltage mode structure it integrates a current error amplifier to have a constant voltage and constant current control. By means of an on board current sense resistor and the availability of the current sense pins (both compatible to Vcc and for Cs- compatible with GND too) a current limit programming is very simple and accurate. Moreover constant current control can be used to charge NiMH and NiCd batteries.The device can be used as a standard DC/DC converter with adjustable current limit (set by using the external sense resistor). The internal robust P-channel DMOS transistor with a typical of 250 mΩ assures high efficiency and a minimum dropout even at high output current level. The internal limiting current (latched function) of typical value of 2.5 A protects the device from accidental output short circuit avoiding dangerous loads damage. If the temperature of the chip goes higher than a fixed internal threshold (150 °C with 20 °C hysteresis), the power stage is turned off.

Other protections beside thermal shutdown complete the device for a safe and reliable application: overvoltage protection, frequency folback overcurrent protection and protection vs. feedback disconnection. The internal fixed switching frequency of 250 kHz, and the SO-8 package pin allow to built an ultra compact DC/DC converter with a minimum board space.

Key Features

• Protection against feedback disconnection
• Internal current limiting
• Thermal shutdown
• Voltage feedforward
• 250 kHz Internally fixed frequency
• Qualified following the AEC-Q100 requirements (see PPAP for more details)
• Operating input voltage from 8 V to 36 V
• Up to 1 A DC output current
• Precise 3.3 V (±2 %) reference voltage
• Zero-load current operation
• Output voltage adjustable from 1.235 V to 35 V

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