LTC3704 Series

Wide Input Range, No RSENSE™Positive-to-Negative DC/DC Controller

Catalog

Wide Input Range, No RSENSE™Positive-to-Negative DC/DC Controller

Part	Voltage - Supply (Vcc/Vdd) [Min]	Voltage - Supply (Vcc/Vdd) [Max]	Supplier Device Package	Duty Cycle (Max) [Max]	Frequency - Switching [Min]	Frequency - Switching [Max]	Function	Operating Temperature [Min]	Operating Temperature [Max]	Control Features	Number of Outputs	Mounting Type	Topology	Output Phases	Package / Case	Package / Case [x]	Package / Case [x]	Output Configuration	Output Type
Analog Devices LTC3704IMS#TRPBF	2.5 V	36 V	10-MSOP	92 %	50 kHz	1 MHz	Step-Up/Step-Down	-40 °C	125 ¯C	Enable Frequency Control	1	Surface Mount	Cuk	1	10-MSOP 10-TFSOP	3 mm	0.118 in	Negative	Transistor Driver
Analog Devices LTC3704IMS	2.5 V	36 V	10-MSOP	92 %	50 kHz	1 MHz	Step-Up/Step-Down	-40 °C	85 °C	Enable Frequency Control	1	Surface Mount	Cuk	1	10-MSOP 10-TFSOP	3 mm	0.118 in	Positive or Negative	Transistor Driver
Analog Devices LTC3704EMS#PBF	2.5 V	36 V	10-MSOP	92 %	50 kHz	1 MHz	Step-Up/Step-Down	-40 °C	85 °C	Enable Frequency Control	1	Surface Mount	Cuk	1	10-MSOP 10-TFSOP	3 mm	0.118 in	Negative	Transistor Driver

Catalog

Wide Input Range, No RSENSE™Positive-to-Negative DC/DC Controller

Key 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

Description

The LTC3704 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.ApplicationsSLIC Power SuppliesTelecom Power SuppliesPortable Electronic EquipmentCable and DSL ModemsRouter Supplies