DESCRIPTION
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.

FEATURES
■ 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

APPLICATIONS
■ SLIC Power Supplies
■ Telecom Power Supplies
■ Portable Electronic Equipment
■ Cable and DSL Modems
■ Router Supplies