High input voltage step-down regulator delivers 3 A

6 November 2002 Power Electronics / Power Management

Linear Technology's LT3430, a constant frequency, step-down switching regulator that includes a 3 A internal switch, can operate with an input range of 5,5 to 60 V and can deliver up to 2,75 A of continuous output current at output voltages as low as 1,25 V.

Suited for telecom, automotive and industrial applications, its unique, high-voltage architecture enables efficiencies as high as 90% even in low duty cycle applications. The LT3430 switches at a constant 200 kHz so external components are small. Alternatively, a sync pin allows external synchronisation from 228 kHz up to 700 kHz with a logic level input.

The LT3430 uses a high efficiency 3 A, 0,1 Ohm switch, with current mode control. Special design techniques and a new high-voltage process enable high efficiency over a wide input voltage range while its current mode topology enables fast transient response and excellent loop stability. Patented circuitry maintains peak switch current over the entire duty cycle range. Supply current is only 2,5 mA during normal operation, while shutdown current is reduced to 25 µA. It is available in a thermally-enhanced TSSOP package.

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