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October 2013
FAN53540
2.4 MHz, 5 A TinyBuck? Synchronous Buck Regulator
Features
Description
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2.4 MHz Fixed-Frequency Operation
Best-in-Class Load Transient Response
5 A Output Current Capability
2.7 V to 5.5 V Input Voltage Range
Adjustable Output Voltage: 0.8V to 90% of V IN
PFM Mode for High Efficiency in Light Load
(Forced PWM Available on MODE Pin)
50 μA Typical Quiescent Current in PFM Mode
External Frequency Synchronization
Low Ripple Light-Load PFM Mode with Forced
PWM Control
Power Good Output
Internal Soft-Start
Input Under-Voltage Lockout (UVLO)
Thermal Shutdown and Overload Protection
No External Compensation Required
20-Bump WLCSP
The FAN53540 is a step-down switching voltage regulator
that delivers an adjustable output from an input voltage
supply of 2.7 V to 5.5 V. Using a proprietary architecture with
synchronous rectification, the FAN53540 is capable of
delivering 5 A at over 90% efficiency, while maintaining a
very high efficiency of over 80% at load currents as low as
2 mA. The regulator operates at a nominal fixed frequency of
2.4 MHz, which reduces the value of the external
components to 470 nH for the output inductor and 20 μF for
the output capacitor. Additional output capacitance can be
added to improve regulation during load transients without
affecting stability and inductance up to 1.2 μH may be used
with additional output capacitance.
At moderate and light loads, pulse frequency modulation
(PFM) is used to operate the device in power-save mode
with a typical quiescent current of 50 μA. Even with such a
low quiescent current, the part exhibits excellent transient
response during large load swings. At higher loads, the
system automatically switches to fixed-frequency control,
operating at 2.4 MHz. In shutdown mode, the supply current
drops below 1 μA, reducing power consumption. PFM mode
Applications
can be disabled if constant frequency is desired. The
FAN53540 is available in a 20-bump 1.96 mm x 1.56 mm
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Set-Top Box
Wafer-Level Chip-Scale Package (WLCSP).
SW
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Hard Disk Drive
Communications Cards
DSP Power
C IN
10 ? F
VIN
C IN1
10nF
PGOOD
L1
0.47 ? H
C OUT
C OUT
EN
MODE
FAN54540
GND
VOUT
FB
10 ? F
R1
10 ? F
Figure 1. Typical Application
Ordering Information
Part Number
FAN53540UCX
Temperature Range
-40 to 85°C
Package
20-Ball Wafer-Level, Chip-Scale Package (WLCSP),
4x5 Array, 0.4 mm Pitch, 250μm Ball
Packing Method
Tape and Reel
? 2011 Fairchild Semiconductor Corporation
FAN53540 ? Rev. 1.0.3
www.fairchildsemi.com
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相关代理商/技术参数
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FAN5354MPX 功能描述:直流/直流开关调节器 3MHz, 3a TinyBuck Sync Buck Regulator RoHS:否 制造商:International Rectifier 最大输入电压:21 V 开关频率:1.5 MHz 输出电压:0.5 V to 0.86 V 输出电流:4 A 输出端数量: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:PQFN 4 x 5
FAN5355 制造商:FAIRCHILD 制造商全称:Fairchild Semiconductor 功能描述:1A / 0.8A, 3MHz Digitally Programmable TinyBuckTM Regulator
FAN5355_10 制造商:FAIRCHILD 制造商全称:Fairchild Semiconductor 功能描述:1A / 0.8A, 3MHz Digitally Programmable Regulator
FAN53555BUC08X 制造商:Fairchild Semiconductor Corporation 功能描述:5A, 2.4 MHZ, DIGITALLY PROGRAMMABLE TINYBUCK TM - Tape and Reel 制造商:Fairchild Semiconductor Corporation 功能描述:IC REG PROGR 4A 2.4MHZ 20WLCSP 制造商:Fairchild Semiconductor Corporation 功能描述:TAPE REEL / 5A, 2.4 MHZ, DIGITALLY PROGRAMMABLE TINYBUCK TM
FAN53555BUC09X 功能描述:直流/直流开关调节器 5 A, 2.4 MHz, Digitally Programmable TinyBuck Regulator RoHS:否 制造商:Fairchild Semiconductor 最大输入电压: 开关频率: 输出电压: 输出电流: 输出端数量: 最大工作温度: 安装风格: 封装 / 箱体:
FAN53555BUC24X 制造商:Fairchild Semiconductor Corporation 功能描述:5A, 2.4 MHZ, DIGITALLY PROGRAMMABLE TINYBUCK TM - Tape and Reel 制造商:Fairchild Semiconductor Corporation 功能描述:IC REG PROGR 4A 2.4MHZ 20WLCSP 制造商:Fairchild Semiconductor Corporation 功能描述:TAPE REEL / 5A, 2.4 MHZ, DIGITALLY PROGRAMMABLE TINYBUCK TM
FAN53555UC00X 功能描述:开关变换器、稳压器与控制器 5A, 2.4 MHZ, DIGTLY PRGRMMABLE TINYBUCK RoHS:否 制造商:Texas Instruments 输出电压:1.2 V to 10 V 输出电流:300 mA 输出功率: 输入电压:3 V to 17 V 开关频率:1 MHz 工作温度范围: 安装风格:SMD/SMT 封装 / 箱体:WSON-8 封装:Reel