LTC1773EMS#PBF

LTC1773 is a current mode synchronous buck regulator controller that drives external complementary power MOSFETs using a fixed frequency architecture. The operating supply range is from 2.65V to 8.5V, making it suitable for 1- or 2-cell lithium-ion battery powered applications. Burst Mode® operation provides high efficiency at low load currents. 100% duty cycle provides low dropout operation which extends operating time in battery-operated systems. The operating frequency is internally set at 550KHz, allowing the use of small surface mount inductors. For switching-noise sensitive applications, it can be synchronized upto 750KHz. Peak current limit is user programmable with an external high side sense resistor. It is used in application such as cellular telephones, RF PA supplies, portable instruments, wireless MODEMS, distributed power systems, notebook and palm top computers, PDAs, single and dual cell lithium-ion powered devices etc.

• VOUT from 0.8V to VIN, OPTI-LOOP® compensation minimizes COUT
• Low quiescent current is 80µA typical at (VITH = 0V, VIN = 5V, VSYNC/mode = open)
• Secondary winding regulation, soft-start
• Current mode operation for excellent line and load transient response
• ±1.5% reference accuracy, undervoltage lockout is 2.5V typ at (VIN ramping down from 3V)
• Shutdown current is 10µA typical at (VRUN/SS = 0V, 2.7V <lt/> VIN <lt/> 8.5V, TA = 25°C. VIN = 5V)
• Feedback current is 20nA typical at (TA = 25°C. VIN = 5V)
• Regulated feedback voltage is 0.80V typ at (TA = 25°C. VIN = 5V)
• Operating ambient temperature is -40°C to 85°C
• Package style is 10-lead plastic MSOP

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