LM2696

LM2696 3A, Constant On Time Buck Regulator October 2005 LM2696 3A, Constant On Time Buck Regulator General Description The LM2696 is a pulse width modulation (PWM) buck regulator capable of delivering up to 3A into a load. The control loop utilizes a constant on-time control scheme with input voltage feed forward. This provides a topology that has excellent transient response without the need for compensation. The input voltage feed forward ensures that a constant switching frequency is maintained across the entire VIN range. The LM2696 is capable of switching frequencies in the range www.DataSheet4U.com of 100 kHz to 500 kHz. Combined with an integrated 130 mΩ high side NMOS switch the LM2696 can utilize small sized external components and provide high efficiency. An internal soft-start and power-good flag are also provided to allow for simple sequencing between multiple regulators. The LM2696 is available with an adjustable output in an exposed pad TSSOP-16 package. Features n n n n n n n n n Input voltage range of 4.5V–24V Constant On-Time No compensation needed Maximum Load Current of 3A Switching frequency of 100 kHz–500 kHz Constant frequency across input range TTL compatible shutdown thresholds Low standby current of 12 µA 130 mΩ internal MOSFET switch Applications n High efficiency step-down switching regulators n LCD Monitors n Set-Top Boxes Typical Application Circuit 20153401 © 2005 National Semiconductor Corporation DS201534 www.national.com LM2696 Conn...