FAN49101 Series

Buck-Boost Regulator, 2 A, 1.8 MHz, TinyPower™ I2C

Catalog

Buck-Boost Regulator, 2 A, 1.8 MHz, TinyPower™ I2C

Part	Voltage - Input (Min) [Min]	Package / Case	Function	Voltage - Input (Max) [Max]	Frequency - Switching	Output Type	Current - Output	Output Configuration	Mounting Type	Number of Outputs	Synchronous Rectifier	Topology	Supplier Device Package	Operating Temperature [Max]	Operating Temperature [Min]	Voltage - Output (Min/Fixed)
ON Semiconductor FAN49101AUC340X	2.5 V	20-UFBGA WLCSP	Step-Up/Step-Down	5.5 V	1.8 MHz	1.81 mOhm	2 A	Positive	Surface Mount	1		Buck-Boost	20-WLCSP (1.96x1.56)	85 °C	-40 °C	3.4 V
ON Semiconductor FAN49101AUC340X	2.5 V	20-UFBGA WLCSP	Step-Up/Step-Down	5.5 V	1.8 MHz	1.81 mOhm	2 A	Positive	Surface Mount	1		Buck-Boost	20-WLCSP (1.96x1.56)	85 °C	-40 °C	3.4 V

Catalog

Buck-Boost Regulator, 2 A, 1.8 MHz, TinyPower™ I2C

Key Features

• 24 µA Typical PFM Quiescent Current

• Above 95% Efficiency

• Total Layout Area = 11.61 mm2

• Input Voltage Range: 2.5 V to 5.5 V

• I2C Compatible Interface

• 1.8 MHz Fixed-Frequency Operation in PWM Mode

• Automatic / Seamless Step-up and Step-down Mode Transitions

• Forced PWM and Automatic PFM/PWM Mode Selection

• 0.5 µA Typical Shutdown Current

• Low Quiescent Current Pass-Through Mode

• Internal Soft-Start and Output Discharge

• Low Ripple and Excellent Transient Response

• Internally Set, Automatic Safety Protections (UVLO, OTP, SCP, OCP)

Description

The FAN49101 is a high efficiency buck-boost switching mode regulator which accepts input voltages either above or below the regulated output voltage. Using full-bridge architecture with synchronous rectification, the FAN49101 is capable of delivering up to 2 A while regulating the output at 3.4 V. The FAN49101 exhibits seamless transition between step-up and step-down modes reducing output disturbances. The output voltage and operation mode of the regulator can be programmed through an I2C interface.At moderate and light loads, Pulse Frequency Modulation (PFM) is used to operate the device in power-save mode to maintain high efficiency. In PFM mode, the part still exhibits excellent transient response during load steps. At moderate to heavier loads or Forced PWM mode, the regulator switches to PWM fixed-frequency control. While in PWM mode, the regulator operates at a nominal fixed frequency of 1.8 MHz, which allows for reduced external component values.