December 23, 2020
3144
The LT3508's low VCESAT (300mV at 1.4A) internal switch has an efficiency of up to 89%, minimizing heat problems. The two converters of the LT3508 can be synchronized with a shared external clock input or internal oscillator, and maintain a 180o phase shift between the two channels to reduce input voltage ripple. The internal 0.80V reference can be used to generate an output voltage lower than 1V, which is required to power the latest generation of low-voltage DSPs and microcontrollers. Independent tracking, soft-start, and Power-Good circuits make power sequencing easy. The low dropout internal switch achieves a duty cycle of up to 98%, while the internal cycle-by-cycle current limit protects the device from output short circuits. Low current (<2uA) shutdown extends the operating time of battery-powered systems.
The LT3508EUF and LT3508EFE in thermally enhanced 4mmx4mmQFN-24 or TSSOP-16E packages are available from stock.
Summary of Features: LT3508
Wide input range: 3.7V to 36V (up to 40V)
Two 1.4A output switching regulators with internal power switches
Adjustable 250kHz to 2.5MHz switching frequency
Can be synchronized across the entire frequency range
Inverting switch reduces ripple
Using small inductors and ceramic capacitors
Accurate programmable undervoltage lockout
Independent tracking, soft start and power good circuits simplify power sequencing
The output can be adjusted down to 800mV
Small 4mmx4mm 24-pin QFN or 16-pin thermally enhanced TSSOP surface mount package
