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FAN5909 Multi-Mode Buck Converter with LDO Assist for GSM / EDGE, 3 G/3.5 G and 4 G PAs Description www.onsemi.com The FAN5909 is a high efficiency, low noise, synchronous, step down, DC DC converter optimized for powering Radio Frequency (RF) Power Amplifiers (PAs) in handsets and other mobile applications. Load currents up to 2.5 A are allowed, which enables GSM / EDGE, 3 G/3.5 G, and 4G platforms under very poor VSWR 1 conditions. The output voltage may be dynamically adjusted from 0.40 V to WLCSP 16 BUMP 3.60 V, proportional to an analog input voltage V ranging from CON CASE 567SD 0.16 V to 1.44 V, optimizing power added efficiency. Fast transition times of less than 6 s are achieved, allowing excellent interslot settling. An integrated LDO is automatically enabled under heavy load conditions or when the battery voltage and voltage drop across the DC DC PMOS device are within a set range of the desired output voltage. This LDOassist feature supports heavy load currents under the most stringent battery and V conditions while maintaining SWR high efficiency, low dropout, and superior spectral performance. The FAN5909 DCDC operates in PWM Mode with a Input UnderVoltage Lockout / Thermal Shutdown 2.9 MHz switching frequency and supports a single, small 1.615 mm x 1.615 mm, 16Bump, 0.4 mm Pitch formfactor inductor ranging from 1.0 H to 2.2 H. In WLCSP addition, PFM operation is allowed at low load currents for 2.9 MHz PWM Mode output voltages below 1.5 V to maximize efficiency. PFM 6 s Output Voltage Step Response for early Tx operation can be disabled by setting MODE pin to LOW. PowerLoop Settling with 14 F Load Capacitance When output regulation is not required, the FAN5909 may Sleep Mode for ~50 A Standby Current Consumption be placed in Sleep Mode by setting V below 100 mV CON nominally. This ensures a very low I (<50 A) while Forced PWM Mode Q enabling a fast return to output regulation. Up to 95% Efficient Synchronous Operation in High FAN5909 is available in a low profile, small form factor, Power Conditions 16 bump, WaferLevel ChipScale Package (WLCSP) that 2.9 MHz PWMOnly Mode is 1.615 mm x 1.615 mm. Only three external components Auto PFM/PWM Mode are required: two 0402 capacitors and one 2016 inductor. 2.9 MHz PWM Operation at High Power and PFM Operation at Low Power and Low Output Voltage Features for Maximum Low Current Efficiency 2 Solution Size < 9.52 mm 2.7 V to 5.5 V Input Voltage Range Applications V Range from 0.40 V to 3.60 V (or V ) Dynamic Supply Bias for Polar or Linear GSM / EDGE OUT IN PAs and 3 G/3.5 G and 4 G PAs Single, Small FormFactor Inductor Dynamic Supply Bias for GSM / EDGE Quad Band 29 m Integrated LDO Amplifiers for Mobile Handsets and Data Cards 100% Duty Cycle for LowDropout Operation Semiconductor Components Industries, LLC, 2013 1 Publication Order Number: November, 2017 Rev. 2 FAN5909/D