FAN53555
5 A, 2.4 MHz, Digitally
Programmable TinyBuck®
Regulator
Description
www.onsemi.com
The FAN53555 is a step−down switching voltage regulator that
delivers a digitally programmable output from an input voltage supply
of 2.5 V to 5.5 V. The output voltage is programmed through an I C
2
interface capable of operating up to 3.4 MHz.
Using a proprietary architecture with synchronous
• 2.5 V to 5.5 V Input Voltage Range
rectification, the FAN53555 is capable of delivering 5 A
continuous at over 80% efficiency, while maintaining over
80% efficiency at load currents as low as 10 mA. Pulse
currents as high as 6.5 A can be supported by the 05 option.
The regulator operates at a nominal fixed frequency of
2.4 MHz, which reduces the value of the external
components to 330 nH for the output induction and as low
as 20 mF for the output capacitor. Additional output
capacitance can be added to improve regulation during load
transients without affecting stability. Inductance up to
1.2 mH may be used with additional output capacitance.
At moderate and light loads, Pulse Frequency Modulation
(PFM) is used to operate in Power−Save Mode with a typical
quiescent current of 60 mA. 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 mA,
reducing power consumption. PFM Mode can be disabled if
constant frequency is desired. The FAN53555 is available in
a 20−bump, 1.6 x 2 mm, WLCSP.
• Digitally Programmable Output Voltage:
♦ 00/01/03/05/08/18 Options: 0.6−1.23 V in 10 mV
Steps
♦ 04/042/09/ Options: 0.603−1.411 V in 12.826 mV
Steps
♦ 23, 79 Option: 0.60−1.3875 V in 12.5 mV Steps
♦ 24 Option: 0.603−1.420 V in 12.967 mV Steps
♦ 13 Option: 0.8−1.43 V in 10 mV Steps
• Programmable Slew Rate for Voltage Transitions
2
• I C−Compatible Interface Up to 3.4 Mbps
• PFM Mode for High Efficiency in Light Load
• Quiescent Current in PFM Mode: 60 mA (Typical)
• Internal Soft−Start
• Input Under−Voltage Lockout (UVLO)
• Thermal Shutdown and Overload Protection
• 20−Bump Wafer−Level Chip Scale Package (WLCSP)
Applications
• Application, Graphic, and DSP Processors
ARM®, Krait, OMAP™, NovaThor™, ARMADA
Features
• Hard Disk Drives
• Fixed−Frequency Operation: 2.4 MHz
• Best−in−Class Load Transient
• Continuous Output Current Capability: 5 A
• Pulse Current Capability: 6.5 A (05 Option)
• Tablets, Netbooks, Ultra−Mobile PCs
• Smart Phones
• Gaming Devices
PVIN
CIN1
CIN
EN
VOUT
SW
SDA
L1
FAN53555
SCL
VDD
COUT
Core
Processor
VSEL
GND
(System Load)
AGND
GND
Figure 1. Typical Application
© Semiconductor Components Industries, LLC, 2010
1
Publication Order Number:
March, 2018 − Rev. 3
FAN53555/D
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