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LTC3704

Linear Technology
Part Number LTC3704
Manufacturer Linear Technology
Description Positive-to-Negative DC/DC Controller
Published Feb 26, 2006
Detailed Description LTC3704 Wide Input Range, No RSENSETM Positive-to-Negative DC/DC Controller U U FEATURES DESCRIPTIO ■ High Efficienc...
Datasheet PDF File LTC3704 PDF File

LTC3704
LTC3704

Overview
LTC3704 Wide Input Range, No RSENSETM Positive-to-Negative DC/DC Controller U U FEATURES DESCRIPTIO ■ High Efficiency Operation (No Sense Resistor Required) ■ Wide Input Voltage Range: 2.
5V to 36V ■ Current Mode Control Provides Excellent Transient Response ■ High Maximum Duty Cycle (Typ 92%) ■ ±1% Internal Voltage Reference ■ ±2% RUN Pin Threshold with 100mV Hysteresis ■ Micropower Shutdown: IQ = 10μA ■ Programmable Switching Frequency (50kHz to 1MHz) with One External Resistor ■ Synchronizable to an External Clock Up to 1.
3 × fOSC ■ User-Controlled Pulse Skip or Burst Mode® Operation ■ Internal 5.
2V Low Dropout Voltage Regulator ■ Capable of Operating with a Sense Resistor for High Output Voltage Applications (VDS >36V) ■ Small 10-Lead MSOP Package U APPLICATIO S ■ SLIC Power Supplies ■ Telecom Power Supplies ■ Portable Electronic Equipment ■ Cable and DSL Modems ■ Router Supplies The LTC®3704 is a wide input range, current mode, positive-to-negative DC/DC controller that drives an N-channel power MOSFET and requires very few external components.
Intended for low to high power applications, it eliminates the need for a current sense resistor by utilizing the power MOSFET’s on-resistance, thereby maximizing efficiency.
The IC’s operating frequency can be set with an external resistor over a 50kHz to 1MHz range, and can be synchronized to an external clock using the MODE/SYNC pin.
Burst Mode operation at light loads, a low minimum operating supply voltage of 2.
5V and a low shutdown quiescent current of 10μA make the LTC3704 ideally suited for battery-operated systems.
For applications requiring constant frequency operation, the Burst Mode operation feature can be defeated using the MODE/SYNC pin.
Higher than 36V switch voltage applications are possible with the LTC3704 by connecting the SENSE pin to a resistor in the source of the power MOSFET.
The LTC3704 is available in the 10-lead MSOP package.
, LTC, LT and LTM are registered trademarks of Linear Technology...


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