Datasheet Analog Devices LTC3122HMSE#PBF

LTC3122
15V, 2.5A Synchronous
Step-Up DC/DC Converter
with Output Disconnect
Description Features
VIN Range: 1.8V to 5.5V, 500mV After Start-Up
Output Voltage Range: 2.2V to 15V
800mA Output Current for VIN = 5V and VOUT = 12V
Output Disconnects from Input When Shut Down
Synchronous Rectification: Up to 95% Efficiency
Inrush Current Limit
Up to 3MHz Adjustable Switching Frequency
Synchronizable to External Clock
n Selectable Burst Mode® Operation: 25µA I
Q
n Output Overvoltage Protectio Soft-Start
n 1.4V
Measured on VOUT, VFB > 1.4V 25
10 40
20 µA
µA N-channel MOSFET Switch Leakage Current VSW = 15V, VOUT = 15V, VC = 0V l 0.1 30 µA P-channel MOSFET Switch Leakage Current VSW = 0V, VOUT = 15V, VSD = 0V l 0.1 70 µA N-channel MOSFET Switch On-Resistance 0.121 P-channel MOSFET Switch On-Resistance 0.188 N-channel MOSFET Current Limit l 2.5 3.5 90 94
1 Maximum Duty Cycle VFB = 1.0V l Minimum Duty Cycle VFB = 1.4V l
l 0.85 SYNC Frequency Range l 0.1 PWM/SYNC Input High l 0.9 •VCC PWM/SYNC Input Low l PWM/SYNC Input Current VPWM/SYNC = 5.5V CAP Clamp Voltage VOUT > 6.1V, Referenced to VOUT VCC Regulation Voltage VIN < 2.8V, VOUT > 5V Error Amplifier Transconductance l SD Input Low l VSD = 5.5V Note 1: Stresses beyond those listed under Absolute Maximum Ratings …