Specification	FAN53555BUC18X

Current - Output	5 A
Frequency - Switching	2.4 MHz
Function	Step-Down
Mounting Type	Surface Mount
Number of Outputs	1
Operating Temperature [Max]	85 °C
Operating Temperature [Min]	-40 °C
Output Configuration	Positive
Output Type	Programmable
Package / Case	WLCSP, 20-UFBGA
Supplier Device Package	20-WLCSP (1.96x1.56)
Synchronous Rectifier	True
Topology	Buck
Voltage - Input (Max) [Max]	5.5 V
Voltage - Input (Min) [Min]	2.5 V
Voltage - Output (Max) [Max]	1.23 V
Voltage - Output (Min/Fixed)	0.6 V

FAN53555 Series

5 A, 2.4 MHz, Digitally Programmable TinyBuck™ Regulator

Part	Operating Temperature [Max]	Operating Temperature [Min]	Package / Case	Current - Output	Mounting Type	Supplier Device Package	Frequency - Switching	Function	Voltage - Output (Min/Fixed)	Voltage - Output (Max) [Max]	Voltage - Input (Max) [Max]	Number of Outputs	Voltage - Input (Min) [Min]	Output Type	Topology	Output Configuration
ON Semiconductor FAN53555UC01X	85 °C	-40 °C	20-UFBGA WLCSP	5 A	Surface Mount	20-WLCSP (1.96x1.56)	2.4 MHz	Step-Down	0.6 V	1.23 V	5.5 V	1	2.5 V	Programmable	Buck	Positive
ON Semiconductor FAN53555UC00X	85 °C	-40 °C	20-UFBGA WLCSP	5 A	Surface Mount	20-WLCSP (1.96x1.56)	2.4 MHz	Step-Down	0.6 V	1.23 V	5.5 V	1	2.5 V	Programmable	Buck	Positive
ON Semiconductor FAN53555UC13X	85 °C	-40 °C	20-UFBGA WLCSP	5 A	Surface Mount	20-WLCSP (1.96x1.56)	2.4 MHz	Step-Down	0.8 V	1.43 V	5.5 V	1	2.5 V	Programmable	Buck	Positive
ON Semiconductor FAN53555BUC13X	85 °C	-40 °C	20-UFBGA WLCSP	5 A	Surface Mount	20-WLCSP (1.96x1.56)	2.4 MHz	Step-Down	0.8 V	1.43 V	5.5 V	1	2.5 V	Programmable	Buck	Positive
ON Semiconductor FAN53555UC01X	85 °C	-40 °C	20-UFBGA WLCSP	5 A	Surface Mount	20-WLCSP (1.96x1.56)	2.4 MHz	Step-Down	0.6 V	1.23 V	5.5 V	1	2.5 V	Programmable	Buck	Positive
ON Semiconductor FAN53555BUC08X	85 °C	-40 °C	20-UFBGA WLCSP	4 A	Surface Mount	20-WLCSP (1.96x1.56)	2.4 MHz	Step-Down	0.6 V	1.23 V	5.5 V	1	2.5 V	Programmable	Buck	Positive
ON Semiconductor FAN53555BUC24X	85 °C	-40 °C	20-UFBGA WLCSP	4 A	Surface Mount	20-WLCSP (1.96x1.56)	2.4 MHz	Step-Down	0.603 V	1.42 V	5.5 V	1	2.5 V	Programmable	Buck	Positive
ON Semiconductor FAN53555BUC23X	85 °C	-40 °C	20-UFBGA WLCSP	5 A	Surface Mount	20-WLCSP (1.96x1.56)	2.4 MHz	Step-Down	0.6 V	1.39 V	5.5 V	1	2.5 V	Programmable	Buck	Positive
ON Semiconductor FAN53555BUC18X	85 °C	-40 °C	20-UFBGA WLCSP	5 A	Surface Mount	20-WLCSP (1.96x1.56)	2.4 MHz	Step-Down	0.6 V	1.23 V	5.5 V	1	2.5 V	Programmable	Buck	Positive
ON Semiconductor FAN53555UC08X	85 °C	-40 °C	20-UFBGA WLCSP	4 A	Surface Mount	20-WLCSP (1.96x1.56)	2.4 MHz	Step-Down	0.6 V	1.23 V	5.5 V	1	2.5 V	Programmable	Buck	Positive

Pricing

Prices provided here are for design reference only. For realtime values and availability, please visit the distributors directly

Distributor	Package	Quantity	$

Digikey	Bulk	515	$ 0.58
		515	$ 0.58
		628	$ 0.48
		628	$ 0.48
	Cut Tape (CT)	1	$ 1.10
		1	$ 1.10
		10	$ 0.99
		10	$ 0.99
		25	$ 0.94
		25	$ 0.94
		100	$ 0.72
		100	$ 0.72
		250	$ 0.64
		250	$ 0.64
		500	$ 0.60
		500	$ 0.60
		1000	$ 0.47
		1000	$ 0.47
	Digi-Reel®	1	$ 1.10
		1	$ 1.10
		10	$ 0.99
		10	$ 0.99
		25	$ 0.94
		25	$ 0.94
		100	$ 0.72
		100	$ 0.72
		250	$ 0.64
		250	$ 0.64
		500	$ 0.60
		500	$ 0.60
		1000	$ 0.47
		1000	$ 0.47
	Tape & Reel (TR)	3000	$ 0.44
		3000	$ 0.44
		6000	$ 0.43
		6000	$ 0.43
		15000	$ 0.41
		15000	$ 0.41
Newark	Each (Supplied on Full Reel)	3000	$ 0.55
		6000	$ 0.50
		12000	$ 0.45
		18000	$ 0.43
		30000	$ 0.42

Description

General part information

FAN53555 Series

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 I2C interface capable of operating up to 3.4 MHz.Using a proprietary architecture with synchronous 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 µF for the output capacitor. Additional output capacitance can be added to improve regulation during load transients without affecting stability. 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 in Power-Save Mode with a typical quiescent current of 60 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 can be disabled if constant frequency is desired. The FAN53555 is available in a 20-bump, 1.6 x 2 mm, WLCSP.