5-bit Programmable Synchronous Buck Regulator Controller - National Semiconductor

The LM2635 is a high speed controller designed specifically for use in synchronous DC/DC buck converters for the Pentium II or Deschutes Microprocessor A 5-bit DAC ac- cepts the VID code directly from the CPU and adjusts the output voltage from 1.8V to 3.5V. It provides the power good, over-voltage protection, and output enable features as re- quired by Intel VRM specifications. Current limiting is achieved by monitoring the voltage drop across the rDS_ON of the high side MOSFET which eliminates an expensive Current Sense resistor. The LM2635 employs a fixed-frequency voltage mode PWM architecture. To provide a faster response to a large and fast load transient, two ultra-fast Comparators are built in to moni- tor the output voltage and override the primary control loop when necessary. The PWM frequency is adjustable from 50 kHz to 1 MHz through an external resistor. The wide range of PWM frequency gives the power supply designer the flexibil- ity to make trade-offs between load transient response per- formance, MOSFET cost and the overall efficiency. The adaptive non-overlapping MOSFET Gate drivers help avoid any potential shoot-through problem while maintaining high efficiency. BiCMOS Gate drivers with Rail-to-Rail swing ensure that no spurious turn-on occur. When only 5V is available, a bootstrap structure CAN be employed to accommodate an NMOS high side Switch The precision reference trimmed to 2% over temperature is available externally for use by other Regulators Dynamic positioning of load voltage, which helps cut the number of output capacitors, CAN also be imple- mented easily. By National Semiconductor Corporation
LM2635 's PackagesLM2635 's pdf datasheet
LM2635M




LM2635 Pinout, Pinouts
LM2635 pinout,Pin out
This is one package pinout of LM2635,If you need more pinouts please download LM2635's pdf datasheet.

LM2635 Application circuits
LM2635 circuits
This is one application circuit of LM2635,If you need more circuits,please download LM2635's pdf datasheet.


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