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参数资料
| 型号： | FAN5903UCX |
| 厂商： | Fairchild Semiconductor |
| 文件页数： | 1/19页 |
| 文件大小： | 0K |
| 描述： | IC CONV BUCK W/BYPASS 9-WLCSP |
| 标准包装： | 3,000 |
| 应用： | 转换器，3G RF 功率放大器 |
| 输入电压： | 2.7 V ~ 5.5 V |
| 输出数： | 1 |
| 输出电压： | 0.4 V ~ 5.5 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 9-UFBGA，WLCSP |
| 供应商设备封装： | * |
| 包装： | 带卷 (TR) |
June 2013
FAN5903
Buck Converter with Bypass Mode for 3G / 3.5G / 4G PAs
Features
Description
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2.7 V to 5.5 V Input Voltage Range
V OUT Range from 0.4 V to 3.5 V (or V IN )
Small Form Factor Inductor
o 2012 470 nH or 540 nH for Minimal PCB Area
o 2520 1.0 μH for Higher Efficiency
Bypass Dropout at 500 mA, 60 mV Typical
100% Duty Cycle for Low Dropout Operation
Input Under-Voltage Lockout / Thermal Shutdown
1.34 mm x 1.29 mm, 9-Bump, 0.4 mm-Pitch,
Wafer-Level Chip-Scale Package (WLCSP)
3 MHz / 6 MHz Selectable Switching Frequency to
Facilitate System Optimization
High-Efficiency PFM Operation at Low Power
Sleep Mode for Very Low I Q Operation
Up to 96% Efficient Synchronous Operation at
High-Power Conditions
10 μs Output Voltage Step Response for Early
Power Loop Settling
FAN5903 is a high-efficiency, low-noise, synchronous,
step-down, DC-DC converter designed for powering
3G / 3.5G / 4G RF Power Amplifiers (PAs) in handsets
and other mobile applications.
The output voltage may be dynamically varied from
0.40 V to 3.50 V, proportional to an analog input V CON ,
ranging from 0.16 V to 1.40 V provided by an external
DAC. This allows the PA to be supplied with the voltage
that enables maximum power-added efficiency.
An integrated bypass FET automatically switches on
when battery voltage drops close to the desired output
voltage (V OUT = V BAT - 200 mV). The DC-DC switches
back to Synchronous Mode when the voltage dropout
exceeds 375 mV. The integrated bypass FET is also
enabled when V CON is nominally greater than to 1.5 V.
The FAN5903 offers fast transition times, enabling
changes to the output voltage in less than 10 μs for
power transitions. Moreover, a Current-Mode control
loop with fast transient response ensures excellent line
and load regulation.
Light-load efficiency is optimized by operating in PFM
Mode for load currents typically less than 100 mA.
Applications
The switching frequency may be set to 3 MHz or
6 MHz, enabling further optimization of system
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Dynamic Supply Bias for 3G/3.5G and 4G PAs
Power Supply for WCDMA/LTE PAs
performance. The FAN5903 typically uses a single,
small-form-factor inductor of 470 nH or 540 nH.
Efficiency may be further optimized using a 1.0 μH
inductor when running at 3 MHz.
Resources
For more information or a full copy of this datasheet,
please contact a Fairchild representative.
When output regulation is not required, the FAN5903
may be placed in Sleep Mode by setting V CON nominally
to 50 mV. This ensures a very low I Q (<70 μA) while
enabling a fast return to output regulation. The
FAN5903 enables significant current reduction and
increased talk time and is available in a 1.34 mm x
1.29 mm, 9-bump, 0.40 mm-pitch, WLCSP package.
Ordering Information
Part Number
FAN5903UCX
Operating
Temperature Range
-40 to +85°C
Package
1.34 mm x 1.29 mm, 9-bump, 0.4 mm Pitch,
Wafer-Level Chip-Scale Package (WLCSP)
Packing Method
Tape and Reel
? 2008 Fairchild Semiconductor Corporation
FAN5903 ? Rev. 1.0.9
www.fairchildsemi.com
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