The LTC3539/LTC3539-2 are synchronous, 2A step-up DC/DC converters with output disconnect. Synchronous rectification enables high efficiency in the low profile 2mm × 3mm DFN package. Battery life is extended with a 700mV start-up voltage and operation down to 500mV once started.
A switching frequency of 1MHz (LTC3539) or 2MHz (LTC3539-2) minimizes solution footprint by allowing the use of tiny, low profile inductors and ceramic capacitors. The current mode PWM design is internally compensated, reducing external parts count. The LTC3539/LTC3539-2 feature a pin-enabled automatic Burst Mode operation at light load conditions. Anti-ring circuitry reduces EMI by damping the inductor in discontinuous mode. Additional features include a low shutdown current of under 1μA and thermal overload protection.
The LTC3539/LTC3539-2 are offered in a 2mm × 3mm × 0.75mm DFN package.
Feature
- Delivers 3.3V at 900mA From 2 Alkaline/NiMH Cells
- Delivers 5V at 900mA From a Lithium-Polymer Battery
- VIN Start-Up Voltage: 700mV
- 1.5V to 5.25V VOUT Range
- Up to 94% Efficiency
- VIN > VOUT Operation
- ±1.5% Feedback Voltage Tolerance
- 1MHz (LTC3539) or 2MHz (LTC3539-2) Fixed Frequency Operation
- Output Disconnect
- Selectable Burst Mode® or PWM Operation
- 10μA Quiescent Current
- Logic Controlled Shutdown: <1μA
- Requires Only 6 External Components
- Low Profile (2mm × 3mm × 0.75mm) DFN Package
Applications
- Medical Instruments
- Portable Bar Code Scanners
- Noise Canceling Headphones
- Portable GPS Navigation
- Handheld PCs
(Picture: Pinout)
