特点
Out-of-Phase Controllers Reduce Required Input Capacitance
True PLL for Frequency Locking or Frequency Adjustment
Operating Frequency Range: 300kHz to 750kHz
Wide V
IN
Range: 2.5V to 10V
Constant Frequency Current Mode Architecture
Low Dropout: 100% Duty Cycle
Power Good Output Voltage Monitor
Internal Soft-Start Circuitry
Selectable Burst Mode?/Pulse Skipping Operation at Light Loads
Output Overvoltage Protection
Low Quiescent Current: 460μA
0.8V ±2% Voltage Reference
Small 16-Lead Narrow SSOP Package
典型应用
典型应用
描述
The LTC?3701 is a 2-phase dual constant frequency current mode step-down DC/DC controller providing excellent load and line regulation. Power loss and noise due to ESR of the input capacitor are minimized by operating the two controller output stages out-of-phase.
The LTC3701 provides a 0.8V ±2% voltage reference and consumes only 460μA of quiescent current. To further maximize the life of a battery source, the external P-channel MOSFET is turned on continuously in dropout (100% duty cycle).
Switching frequency is internally set at 550kHz, allowing the use of small inductors and capacitors. For noise sensitive applications, the LTC3701 can be externally synchronized using its phase-locked loop. The frequency can also be externally set from 300kHz to 750kHz by applying a voltage to the PLLLPF pin. Burst Mode operation is inhibited during synchronization or when the EXTCLK/MODE pin is pulled low to reduce noise and RF interference.
The LTC3701 contains independent internal soft-start circuitry for each controller. Other features include a power good output voltage monitor and output overvoltage and short-circuit protection.
The LTC3701 is available in a small footprint 16-lead narrow SSOP package.