LX1660

Supply Voltage ............................................................................................................. 25V
Output Peak Current Source (500ns) ......................................................................... 1.5A
Output Peak Current Sink (500ns) ............................................................................. 1.5A
Analog Inputs ................................................................................................... -0.3 to +6V
Power Dissipation at TA = 25°C
N Package ............................................................................................................... 1.5W
D Package........................................................................................................... 830mW
Operating Junction Temperature
Plastic (N, D Packages) ......................................................................................... 150°C
Storage Temperature Range .................................................................... -65°C to +150°C
Lead Temperature (Soldering, 10 Seconds) ............................................................. 300°C
Note 1. Exceeding these ratings could cause damage to the device. All voltages are with respect
to Ground. Currents are positive into, negative out of the specified terminal. Pin
numbers refer to DIL packages only.

The LX1660 and LX1661 Are Monolithic Switching Regulator Controller ICs designed to provide low-cost, highperformance adjustable power supply for microprocessors and other applications requiring a fast transient response and a high degree of accuracy. They provide an adjustable synchronous Pulse Width
Modulator output suitable for a power supply for Pentium® or other microprocessors. Synchronous Rectifier Driver For CPU Core. The devices can drive dual MOSFETs resulting in typical efficiencies of 85 - 90%, even with loads in excess of 10A. Synchronous shutdown results in increased efficiency in light load applications. Short-Circuit Current Limiting Without Expensive Current Sense Resistors.

The current sensing mechanism can use a PCB trace resistance or the parasitic resistance of the main inductor. For applications requiring a high degree of accuracy, a conventional sense resistor can be used.Hiccup Mode Fault Protection. The LX1660 hiccup mode is programmable and with pulse-by-pulse current limiting will help
protect the power supply system and load in the even of a short circuit.

Ultra-Fast Transient Response Reduces System Cost. The fixed frequency modulated off-time architecture results in the fastest transient response for a given inductor. Adaptive voltage positioning (LX1660 only) requires fewer low-ESR capacitors to meet stringent transient overand under-shoot specifications.