LTC3730

· ±5% Output Current Match Optimizes Thermal Performance and Size of Inductors and MOSFETs
· 3-Phase Current Mode Controller with Onboard MOSFET Drivers
· Operational Amplifier Accomodates Mode Switching
· ±1% VREF Accuracy Over Temperature
· Reduced Input and Output Capacitance
· Reduced Power Supply Induced Noise
· VOUT Programmable from 0.6V to 1.75V (IMVP III)
· ±10% Power Good Output Indicator
· 250kHz to 600kHz Per Phase, PLL, Fixed Frequency
· PWM, Stage Shedding_TM or Burst Mode^® Operation
· OPTI-LOOP^® Compensation Minimizes C_OUT
· Adjustable Soft-Start Current Ramping
· 4V, V_IN, Undervoltage RUN/SS Reset/Reattempt Circuit
· Short-Circuit Shutdown Timer with Defeat Option
· Overvoltage Soft Latch

· Desktop Computers
· High Performance Notebook Computers
· High Output Current DC/DC Power Supplies

Topside Driver Voltages (BOOST_N) ............ 38V to 0.3V
Switch Voltage (SW_N)................................... 32V to 5V
Boosted Driver Voltage (BOOST_N SW_N) ... 7V to 0.3V
Peak Output Current <1ms (TG_N, BGN) ..................... 5A
Supply Voltage (V_CC), PGOOD
Pin Voltages ............................................... 7V to 0.3V
PLLIN, RUN/SS, PLLFLTR, FCB Voltages .... V_CC to 0.3V
I_TH Voltage ............................................. 2.4V to 0.3V
Operating Ambient Temperature Range .. 0°C to 70°C
Junction Temperature (Note 2) .......................... 125°C
Storage Temperature Range .............65°C to 150°C
Lead Temperature (Soldering, 10 sec)................ 300°C

The LTC^®3730 is a PolyPhase^® synchronous step-down switching regulator controller that drives all N-channel external power MOSFET stages in a phase-lockable fixed frequency architecture. The 3-phase controller drives its output stages with 120° phase separation at frequencies of up to 600kHz per phase to minimize the RMS losses in both the input and output filter capacitors. The 3-phase technique effectively triples the fundamental frequency, improving transient response while operating each controller at an optimal frequency for efficiency and ease of thermal design. Light load efficiency of LTC3730 is optimized by using a choice of output Stage Shedding or Burst Mode technology.

An internal operational amplifier of LTC3730 provides mode selectable output voltage programming in conjunction with the internal VID voltage control DAC.

Soft-start and a defeatable, timed short-circuit shutdown protect the MOSFETs and the load. Current foldback provides protection for the external MOSFETs under short-circuit or overload conditions.