FAN5182_08 Datasheet, PDF (1/19 Pages) Fairchild Semiconductor – Adjustable Output, 1-, 2-, or 3-Phase Synchronous Buck Controller

March 2008
FAN5182 — Adjustable Output, 1-, 2-, or 3-Phase
Synchronous Buck Controller
Features
ƒ Selectable 1-, 2-, or 3-Phase Operation at up to
1MHz per Phase
ƒ Accuracy: 1%
ƒ Externally Adjustable 0.8V to 5V Output from a
12V Supply
ƒ Logic-Level PWM Outputs for Interface to External
High-Power Drivers
ƒ Active Current Balancing Between all Phases
ƒ Built-in Power-Good / Crowbar Functions
ƒ Programmable Over-Current Protection with
Adjustable Latch-Off Delay
Applications
ƒ Auxiliary Supplies
ƒ DDR Memory Supplies
ƒ Point-of-Load Supplies
Description
The FAN5182 is a highly efficient, multiphase,
synchronous buck switching regulator controller
optimized for converting a 12V main supply into a high-
current, low-voltage supply for use in point-of-load
(POL) applications. It uses a multi-loop PWM
architecture to drive the logic-level outputs at a
programmable switching frequency that can be
optimized for regulator size and efficiency. The phase
relationship of the output signals can be programmed to
provide 1-, 2-, or 3-phase operation, allowing for
construction of up to three complementary, interleaved
buck switching stages.
The FAN5182 provides accurate and reliable over-
current protection and adjustable current limiting.
The FAN5182 is specified over the commercial
temperature range of 0°C to +85°C and is available in a
20-lead Quarter-Size Outline Package (QSOP).
Ordering Information
Part Number
Temperature Range Package
FAN5182QSCX_NA3E229
0°C to 85°C
QSOP-20L
All packages are lead free per JEDEC: J-STD-020B standard.
Packing Method
Tape and Reel
Quantity per Reel
2500
© 2005 Fairchild Semiconductor Corporation
FAN5182 • Rev. 1.1.3
www.fairchildsemi.com