LM2614BTL

OBSOLETE LM2614 www.ti.com SNVS184B – AUGUST 2002 – REVISED APRIL 2013 LM2614 400mA Sub-Miniature Adjustable DC-DC Converter Optimized for RF Power Amplifiers Check for Samples: LM2614 FEATURES APPLICATIONS • • • • • • • 1 2 • • • • Sub-miniature 10-bump Thin DSBGA Package Uses Small Ceramic Capacitors 5mV typ PWM Mode Output Voltage Ripple (COUT = 22µF) Internal Soft Start Current Overload Protection Thermal Shutdown External Compensation KEY SPECIFICATIONS • • • • • • • • • • Operates from a Single LiION Cell (2.8V to 5.5V) Adjustable Output Voltage (1.0V to 3.6V) ±1% DC Feedback Voltage Precision 400mA Maximum Load Capability (300mA for B Grade) 600μA typ PWM Mode Quiescent Current 0.02μA typ Shutdown Current 600kHz PWM Switching Frequency SYNC Input for PWM Mode Frequency Synchronization from 500kHz to 1MHz High Efficiency (96% typ at 3.9VIN, 3.6VOUT and 200mA) in PWM Mode from Internal Synchronous Rectification 100% Maximum Duty Cycle for Lowest Dropout Mobile Phones Hand-Held Radios RF PC Cards Battery Powered RF Devices DESCRIPTION The LM2614 DC-DC converter is optimized for powering RF power amplifiers (PAs) from a single Lithium-Ion cell. It steps down an input voltage of 2.8V to 5.5V to an output of 1.0V to 3.6V at up to 400mA (300mA for B grade). Output voltage is set using an analog input to VCON in the application circuit. The device offers three modes for mobile phones and similar RF PA applications. Fixed-frequency PWM mode minimizes RF interference. A SYNC input allows synchronizing the switching frequency in a range of 500kHz to 1MHz. Low current hysteretic PFM mode reduces quiescent current to 160µA (typ.). Shutdown mode turns the device off and reduces battery consumption to 0.02µA (typ.). Current limit and thermal shutdown features protect the device and system during fault conditions. The LM2614 is available in a 10 bump DSBGA package. This packaging uses TI's chip-scale DSBGA technology and offers the smallest possible size. A high switching frequency (600kHz) allows use of tiny surface-mount components. The LM2614 can be dynamically controlled for output voltage changes from 1.0V to 3.6V in