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FAN5904 — Multi-Mode Buck Converter for GSM/EDGE, 3G/3.5G and 4G PAs
October 2013
FAN5904
Multi-Mode Buck Converter for GSM/EDGE, 3G/3.5G and 4G PAs
Features
2.7 V to 5.5 V Input Voltage Range
V
OUT
Range from 0.40 V to 3.50 V (or V
IN
)
Single 470 nH Small Form Factor Inductor
35 mΩ Integrated Bypass FET
100% Duty Cycle for Low Dropout Operation
Input Under-Voltage Lockout / Thermal Shutdown
1.71 mm x 1.71 mm, 16-Bump, 0.4 mm Pitch WLCSP
High Power PWM Mode
o
o
o
o
Up to 95% Efficient Synchronous Operation in
High P
OUT
Conditions
Output current up to 2.3 A
10 µs Output Voltage Step Response for Early
GSM Tx Power-Loop Settling
3MHz PWM Mode
Description
The FAN5904 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. In High-Power Mode, GSM Tx
power is enabled. In Low-Power Mode, up to 3.0 W is
supported, enabling up to 29 dBm output power for 3G/3.5G
and 4G platforms.
The output voltage may be dynamically adjusted from
0.40 V to 3.50 V, proportional to an analog input voltage
VCON ranging from 0.16 V to 1.40 V, optimizing power-
added efficiency. Fast transition times of less than 10 µs are
achieved, allowing excellent inter-slot settling.
An integrated bypass FET is automatically enabled when
the battery voltage and voltage drop across the DC-DC
PMOS device are within a set voltage range of the desired
output voltage (V
OUT
= V
BAT
- V
PMOS
- V
BP_TH
). This dynamic
bypass feature enables the FAN5904 to support heavy load
currents under the most stringent VSWR conditions while
maintaining high efficiency and superior spectral
performance. The bypass FET may also be enabled by
providing a VCON voltage nominally greater than or equal
to 1.5 V or by driving BPEN high.
The FAN5904 operates in PWM Mode with a 6 MHz
switching frequency in Low-Power Mode and at 3 MHz in
High-Power Mode, which limits high-frequency spur levels.
It uses a single, small form factor inductor of 470 nH. In
addition, PFM operation is allowed in Low-Power Mode to
improve efficiency at low load currents.
The FAN5904UC00X option allows PFM Mode only when
V
OUT
is less than 1 V, while the FAN5904UC01X permits
PFM Mode at higher voltages for applications that can
tolerate larger output ripple and that demand optimal low-to-
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