SC2449 Datasheet | SEMTECH

Description The SC2449 can be configured as a dual converter or a bi-phase converter for high current applications. The part is designed for point of use power supplies with 8.5-28V nominal backplane power sources. Multiple supplies can be synchronized together to prevent low frequency harmonics on the backplane. The power dissipation is controlled using a novel low voltage supply technique, allowing high speed and integration, with the high drive currents to ensure low MOS.ET switching loss. The use of high speed switching circuits allows very narrow PWM outputs down to 15:1 voltage ratios. Single pin pensation for each channel simplifies development as well as reducing external pin count. Capable of driving MOS.ETs via external driver transistors for phase currents beyond 20A. .eatures K K K K K K K K K K Selectable dual output or bi-phase operation Direct drive for N-channel MOS.ETs Undervoltage lockout Synchronization to external clock Multi-converter synchronization Soft start .ast transient response Max duty cycle 45% Output over voltage protection Thermal shutdown Applications K Power supplies for advanced teles/datas K SO IP, Ethernet and PABX power supplies Typical Application Circuit Revision 4, May 2002 .semtech. POWER MANAGEMENT Absolute Maximum Ratings Parameter Supply Voltage Voltage on BST Pins Oscillator Frequency VC C Thermal Resistance Junction to Case Thermal Resistance Junction to Ambient Operating Temperature Range Storage Temperature Range Lead Temperature (Soldering) 10 seconds θJ C θJ A TA TSTG TLEAD (1) .. Exceeding the specifications below may result in permanent damage to the device, or device malfunction. Operation outside of the parameters specified in the Electrical Characteristics section is not implied. Symbol VIN V BST Maximum 30 38 2 8 25 80 -40 to +85 -55 to +150 300 Units V V MHz V °C/W °C/W °C °C °C Note: (1) Maximum frequency and maximum supply voltage could cause excessive power dissipation in the...