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LTC3701

Linear Technology
Part Number LTC3701
Manufacturer Linear Technology
Description Dual Step-Down DC/DC Controller
Published Mar 27, 2005
Detailed Description LTC3701 2-Phase, Low Input Voltage, Dual Step-Down DC/DC Controller FEATURES s s DESCRIPTIO s s s s s s s s s s s Ou...
Datasheet PDF File LTC3701 PDF File

LTC3701
LTC3701

Overview
LTC3701 2-Phase, Low Input Voltage, Dual Step-Down DC/DC Controller FEATURES s s DESCRIPTIO s s s s s s s s s s s Out-of-Phase Controllers Reduce Required Input Capacitance True PLL for Frequency Locking or Frequency Adjustment Operating Frequency Range: 300kHz to 750kHz Wide VIN 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 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.
U APPLICATIO S s s s s s One or Two Lithium-Ion Powered Applications Notebook and Handheld Computers Personal Digital Assistants Portable Instruments Distri...


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