LT1306 Datasheet | Linear Technology

LT1306 Synchronous, Fixed Frequency Step-Up DC/DC Converter Features s s DESCRIPTIO s s s s s s s s Output Disconnected from Input During Shutdown Output Voltage Remains Regulated When VIN > VOUT Controlled Input Current During Start-Up 300k Hz Current Mode PWM Operation Can Be Externally Synchronized Internal 2A Switches Operates with VIN as Low as 1.8V Automatic Burst Mode Operation at Light Loads Quiescent Current: 160µA Shutdown Current: 9µA Typ The LT®1306 is a fully integrated, fixed frequency synchronous boost converter capable of generating 5V at 1A from a Li-Ion cell. The device contains both the main power switch and synchronous rectifier on chip and automatically disconnects the output from the input in shutdown, eliminating the need for external load disconnect circuitry. Additionally, the output remains regulated when VIN exceeds VOUT, allowing difficult step-up/stepdown converter functions to be easily realized using a single inductor. The internal 300k Hz oscillator of the LT1306 can be easily synchronized to an external clock from 425k Hz to 500k Hz. This allows switching harmonics to be tightly controlled and eliminates any beat frequencies that may result from a multifrequency system. The LT1306 automatically shifts into power saving Burst Mode TM operation at light loads. At heavy loads the LT1306 operates in fixed frequency current mode. No-load quiescent current is 160µA and reduces to 9µA in shutdown mode. The LT1306 is available in an SO-8 package. U APPLICATIO S s s s s Satellite Phones Portable Instruments Personal Digital Assistants Palmtop puters , LTC and LT are registered trademarks of Linear Technology Corporation. Burst Mode is a trademark of Linear Technology Corporation. TYPICAL APPLICATION D1 L1 10µH C1 1µF 90 85 EFFICIENCY (%) 1-CELL Li-Ion VIN S/S SW LT1306 CAP OUT R1 768k FB GND R2 249k 5V 1A + CIN1 22µF CIN2 0.1µF + CO1 220µF CO2 1µF CIN1: AVX TAJC226M010 CO1: AVX TPSE227M010R0100 CIN1, CO2: CERAMIC C1: AVX...