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R6902D：Up to 1 A Switch Step Down regulator with Adjustable Current Limit

The R6902D is a complete and simple step-down switching regulator with an 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) 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 the 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 a high output current level. The internal limiting current (latched function) of typical value of 2.5 A protects the device from an 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. The large ambient temperature range makes it ideal for aerospace and defense applications.

Other protections beside the thermal shutdown complete the device for a safe and reliable application: overvoltage protection, frequency foldback 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

• General features
  • 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
  • Voltage feedforward
  • Zero load current operation
  • Internal current limiting
  • Protection against feedback disconnection
  • Thermal shutdown
• Aerospace and defense features
  • Suitable for use in aerospace and defense applications
  • Dedicated traceability and part marking
  • Production parts approval documents available
  • Adapted extended life time and obsolescence management
  • Extended product change notification process
  • Designed and manufactured to meet sub-ppm quality goals
  • Advanced mold and frame designs for superior resilience in harsh environments (acceleration, EMI, thermal, humidity)
  • Extended screening capability on request

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