LT1938EDD#PBF

LT1938 is a monolithic buck switching regulator. A high efficiency 0.18ohm switch is included on the die along with a boost schottky diode and the necessary oscillator, control and logic circuitry. Current mode topology is used for fast transient response and good loop stability. It’s high operating frequency allows the use of small, low cost inductors and ceramic capacitors resulting in low output ripple while keeping total solution size to a minimum. The low current shutdown mode reduces input supply current to less than 1µA while a resistor and capacitor on the RUN/SS pin provide a controlled output voltage ramp (soft-start). A power good flag signals when VOUT reaches 90% of the programmed output voltage. It is used in application such as automotive battery regulation, power for portable, products, distributed supply regulation, industrial supplies, wall transformer regulation etc.

• Wide input voltage range is 3.6V to 25V
• 2.2A maximum output current
• Integrated boost diode, power good flag
• 1.265V feedback reference voltage
• Output voltage range is 1.265V to 20V
• Soft-start capability
• Switching frequency is 3MHz typical at (RT = 8.66K)
• Switch VCESAT is 360mV typical at (ISW = 2A)
• Operating junction temperature is -40°C to 125°C
• Package style is 10-lead plastic DFN

Notes

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