FAN49103 Datasheet, PDF (1/2 Pages) Fairchild Semiconductor – 2.5 A, 1.8 MHz, TinyPower™ I2C Buck-Boost Regulator

March 2016
FAN49103 — 2.5 A, 1.8 MHz, TinyPower™ I²C Buck-
Boost Regulator
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
 Maximum Continuous Load Current:
- 2.5 A at VOUT=3.4 V, VIN=3.6 V
- 2 A at VOUT=3.4 V, VIN=2.5 V
 I²C Compatible Interface
 Programmable Output Voltage:
- 2.8 V to 4.0 V in 25 mV Steps
 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 FAN49103 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
FAN49103 is capable of delivering up to 2.5 A while
regulating the output at 3.4 V. The FAN49103 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.
Applications
 Smart Phones
 Tablets, Netbooks^®, Ultra-Mobile PCs
 Portable Devices with Li-ion Battery
 2G/3G/4G Power Amplifiers
 NFC Applications
Figure 1. Typical Application
Additional Information
For the full datasheet, please contact a Fairchild Sales
Representative.
Ordering Information
Part Number
FAN49103AUC340X
© 2016 Fairchild Semiconductor Corporation
FAN49103 • Rev.1.0
Output Discharge
Yes
Temperature Range
-40 to 85°C
Packing Method
Tape and Reel
www.fairchildsemi.com