LTC3829 Synchronous Step-Down DC/DC Controller Application Circuit

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description

The LTC3829 is a high performance, three phase, single output, synchronous step-down DC/DC switching controller for driving all N-channel synchronous power MOSFET stages. A constant frequency current mode architecture provides a phase lockable frequency of up to 770kHz. By operating the three controller output stages out of phase, power loss and noise due to the ESR of the input capacitor are minimized.

The LTC3829 is configurable for 6-phase operation with DCR temperature compensation and output foldback current limiting. The device features a precision 0.6V reference and a power good indicator.

Optimize efficiency at light loads by choosing to use output progressive decrement or burst mode operation. At the point of load, a differential amplifier provides true output voltage remote sampling.

The LTC3829 is available in a low profile 38-lead 5mm x 7mm QFN package and a bare pad FE package.

Characteristics

• Optional nonlinear control for fast response
• ±0.75%, 0.6V reference accuracy
• PWM, Stage SheddingTM or Burst Mode? operation
• High efficiency: up to 95%
• RSENSE or DCR current sensing
• Programmable DCR temperature compensation
• Lockable fixed frequency: 250kHz to 770kHz
• True remote sampling differential amplifier
• Programmable Active Voltage Positioning (AVP)
• Triple N-Channel MOSFET Synchronous Drive
• Wide VIN range: 4.5V to 38V during operation
• VOUT range: 0.6V to 5V (differential amplifier not used)
• VOUT range: 0.6V to 3.3V (with differential amplifier)
• Clock input and output for 6-phase operation
• Adjustable soft start or VOUT tracking
• 38-pin (5mm x 7mm) QFN package and FE package

application

• Laptop and palmtop
• Telecommunications system
• Portable instrument
• DC power distribution system

LTC3829 Typical Application Circuit

The above is part of the information, see the PDF document data sheet for more details!