LT1940EFE#TRPBF

LT1940 is a dual current mode PWM step-down DC/DC converter with internal 2A power switches. The output voltages are set with external resistor dividers, and each regulator has independent shutdown and soft-start circuits. This regulator generates a power-good signal when its output is in regulation, easing power supply sequencing and interfacing with microcontrollers and DSPs. Constant frequency and ceramic capacitors combine to produce low, predictable output ripple voltage. With its wide input range of 3.6V to 25V, this device regulates a wide variety of power sources, from 4-cell batteries and 5V logic rails to unregulated wall transformers, lead acid batteries and distributed-power supplies. It is intended to operate from regulated 5V supplies. It is widely used in application such as disk drives, DSP power supplies, wall transformer regulation, distributed power regulation, DSL modems, cable modems etc.

• Anti-phase switching reduces ripple
• Independent shutdown/soft-start pins
• Independent power good indicators ease supply sequencing
• Uses small inductors and ceramic capacitors
• Switching frequency is 1.1MHz typical
• Quiescent current is 3.8mA typical
• Shutdown current is 30µA typical
• Switch VCESAT is 210mV typical at (ISW = 1A)
• Operating temperature is -40°C to 85°C
• Package style is 16-lead plastic TSSOP

Notes

ADI products are only authorized (and sold) for use by the customer and are not to be resold or otherwise passed on to any third party