特点
3-Phase Current Mode Controller with Onboard MOSFET Drivers
±5% Output Current Match Optimizes Thermal Performance and Size of Inductors and MOSFETs
Operational Amplifier Accomodates Mode Switching
±1% V
REF
Accuracy Over Temperature
Reduced Input and Output Capacitance
Reduced Power Supply Induced Noise
V
OUT
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? 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
Small 36-Lead Narrow (0.209”) SSOP Package
典型应用
描述
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 is optimized by using a choice of output Stage Shedding or Burst Mode technology.
An internal operational amplifier 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.