FAN5909
FAN5909 is Multi-Mode Buck Converter manufactured by onsemi.
Multi-Mode Buck Converter with LDO Assist for GSM / EDGE, 3 G/3.5 G and 4 G PAs
Description The FAN5909 is a high- efficiency, low- noise, synchronous,
.onsemi. 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 conditions.
The output voltage may be dynamically adjusted from 0.40 V to
3.60 V, proportional to an analog input voltage VCON ranging from 0.16 V to 1.44 V, optimizing power- added efficiency. Fast transition
WLCSP 16 BUMP CASE 567SD times of less than 6 ms are achieved, allowing excellent inter- slot 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 LDO- assist feature supports heavy load currents under the most stringent battery and VSWR conditions while maintaining high efficiency, low dropout, and superior spectral performance.
The FAN5909 DC- DC operates in PWM Mode with a
- Input Under- Voltage Lockout / Thermal Shutdown
2.9 MHz switching frequency and supports a single, small form- factor inductor ranging from 1.0 m H to 2.2 m H. In addition, PFM operation is allowed at low load currents for output voltages below 1.5 V to maximize efficiency. PFM operation can be disabled by setting MODE pin to LOW.
When output regulation is not required, the FAN5909 may be placed in Sleep Mode by setting VCON below 100 m V nominally. This ensures a very low IQ (<50 m A) while enabling a fast return to output regulation.
- 1.615 mm x 1.615 mm, 16- Bump, 0.4 mm Pitch
WLCSP
- 2.9 MHz PWM Mode
- 6 ms Output Voltage Step Response for early Tx
Power- Loop Settling with 14 m F Load Capacitance
- Sleep Mode for ~50 m A Standby Current Consumption
- Forced PWM Mode
- Up to 95% Efficient...
