November 2012
FAN48630 — 2.5 MHz, 1500 mA, Synchronous TinyBoost™
Regulator with Bypass Mode
Features
Description
The FAN48630 allows systems to take advantage of new
battery chemistries that can supply significant energy when
the battery voltage is lower than the required voltage for
system power ICs. By combining built-in power transistors,
synchronous rectification, and low supply current; this IC
provides a compact solution for systems using advanced
Li-Ion battery chemistries.
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Few External Components: 0.47 µH Inductor and
0603 Case Size Input and Output Capacitors
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Input Voltage Range: 2.35 V to 5.5 V
Fixed Output Voltage Options: 3.0 V to 5.0 V
Maximum Continuous Load Current: 1500 mA
at VIN of 2.6 V Boosting VOUT to 3.5 V
The FAN48630 is a boost regulator designed to provide a
minimum output voltage (VOUT(MIN)) from a single-cell Li-Ion
battery, even when the battery voltage is below system
minimum. Output voltage regulation is guaranteed to a
maximum load current of 1500 mA. Quiescent current in
Shutdown Mode is less than 3 µA, which maximizes battery
life. The regulator transitions smoothly between Bypass and
normal Boost Mode. The device can be forced into Bypass
Mode to reduce quiescent current.
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Up to 96% Efficient
True Bypass Operation when VIN > Target VOUT
Internal Synchronous Rectifier
Soft-Start with True Load Disconnect
Forced Bypass Mode
VSEL Control to Optimize Target VOUT
Short-Circuit Protection
The FAN48630 is available in a 16-bump, 0.4 mm pitch,
Wafer-Level Chip-Scale Package (WLCSP).
Low Operating Quiescent Current
16-Bump, 0.4 mm Pitch WLCSP
Applications
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Boost for Low-Voltage Li-ion Batteries, Brownout
Prevention, Boosted Audio, USB OTG, and LTE / 3G
RF Power
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Cell Phones, Smart Phones, Portable Instruments
Figure 1. Typical Application
Ordering Information
Output Voltage(1)
Soft-
Start
Forced
Bypass
Operating
Temperature
Packing
Part Number
Package(2)
VSEL0 / VSEL1
3.15 / 3.33
3.30 / 3.49
3.50 / 3.70
3.70 / 3.77
4.50 / 4.76
5.00 / 5.29
FAN48630UC315X
FAN48630UC33X
FAN48630UC35X
FAN48630UC37AX
FAN48630UC45X
FAN48630UC50X
Notes:
FAST
FAST
FAST
FAST
SLOW
SLOW
Low IQ
16-Ball, 4x4 Array,
0.4 mm Pitch,
250 µm Ball,
Wafer-Level Chip-
Scale Package
(WLCSP)
Low IQ
Low IQ
-40°C to 85°C
Tape and Reel
Low IQ
OCP On
OCP On
1. Other output voltages are available on request. Please contact a Fairchild Semiconductor representative.
2. Includes backside laminate.
© 2011 Fairchild Semiconductor Corporation
FAN48630 • Rev. 1.0.1
www.fairchildsemi.com