LM25005 Datasheet | National Semiconductor

Description The LM25005 switching regulator features all of the functions necessary to implement an efficient, high voltage buck regulator using a minimum of external ponents. This easy to use regulator includes a 42V, 160mΩ, N-channel MOSFET, with an output current capability of 2.5 Amps. The regulator control method is based upon current mode control utilizing an emulated current ramp. Current mode control provides inherent line voltage feed-forward, cycle-by-cycle current limiting and ease of loop pensation. The use of an emulated control ramp reduces noise sensitivity of the pulse-width modulation circuit, allowing reliable control of very small duty cycles necessary in high input voltage applications. The operating frequency is programmable from 50k Hz to 500k Hz. An oscillator synchronization pin allows multiple LM25005 regulators to self-synchronize or to be synchronized to an external clock. Additional protection features include: current limit, thermal shutdown and remote shutdown capability. The device is available in a power enhanced TSSOP-20 package featuring an exposed die attach pad to aid thermal dissipation. Features n n n n n n n n n n n n Integrated 42V, 160mΩ N-channel MOSFET Ultra-wide input voltage range from 7V to 42V Internal bias regulator Adjustable output voltage from 1.225V 1.5% feedback reference accuracy Current mode control with emulated inductor current ramp Single resistor oscillator frequency setting Oscillator synchronization input Programmable soft-start Shutdown / Standby input Wide bandwidth error amplifier Thermal Shutdown Package n TSSOP-20EP (Exposed Pad) Simplified Application Schematic © 2006 National Semiconductor Corporation DS201700 .national. Connection Diagram Top View 20-Lead TSSOP Ordering Information Order Number LM25005MH LM25005MHX Package Type Exposed Pad TSSOP-20 Exposed Pad TSSOP-20 NSC Package Drawing MXA20A MXA20A Supplied As 73 Units in Rail 2500 Units on Tape and...