LTC1149CS#PBF

LTC1149 is a synchronous stepdown switching regulator controller featuring automatic Burst Mode™ operation to maintain high efficiencies at low output currents. These devices drive external complementary power MOSFETs at switching frequencies upto 250KHz using a constant off-time current-mode architecture. Special onboard regulation and level-shift circuitry allow operation at input voltages from dropout to 48V (60V absolute max). The constant off-time architecture maintains constant ripple current in the inductor, easing the design of wide input range converters. Current mode operation provides excellent line and load transient response. The operating current level is user-programmable via an external current sense resistor. It is widely used in application such as notebook and palmtop computers, portable instruments, battery-operated digital devices, industrial power distribution, avionics systems, telecom power supplies etc.

• Ultrahigh efficiency upto 95%
• High efficiency maintained over wide current range
• Logic-controlled micropower shutdown
• Short-circuit protection
• Synchronous FET switching for high efficiency
• Adaptive nonoverlap gate drives
• Burst mode output ripple is 50mVP-P typical at (TA = 25°C, VIN = 12V, V10 = 0V)
• Input DC supply current (burst mode) is 0.6mA typical at (VIN = 12V)
• Input DC supply current (shutdown) is 135µA typical at (VIN = 12V, V15 = 2V)
• Operating temperature is 0°C to 70°C, package style is 16-lead NSOIC

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