FAN5193MTCX View Datasheet(PDF) - Fairchild Semiconductor
Part Name
Description
Manufacturer
FAN5193MTCX Datasheet PDF : 21 Pages
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www.fairchildsemi.com
FAN5193
Two Phase Interleaved Synchronous Buck
Converter
Features
• Programmable output from 1.10V to 1.85V in 25mV steps
using an integrated 5-bit DAC
• Two interleaved synchronous phases for maximum
performance
• 100nsec response time
• Built-in current sharing between phases
• Remote sense
• Programmable Active Droop (Voltage Positioning)
• Programmable frequency from 200KHz to 2MHz
• Adaptive delay gate switching
• Integrated high-current gate drivers
• Integrated Power Good, OV, UVLO, Enable/Soft Start
functions
• Drives N-channel MOSFETs
• Operation optimized for 12V operation
• High efficiency mode (E*) at light load
• Overcurrent protection using MOSFET sensing
• 24 pin TSSOP package
Applications
• Power supply for Pentium IV
• Power supply for Athlon
• VRM for Pentium IV processor
• Programmable step-down power supply
Description
The FAN5193 is a synchronous multi-phase DC-DC control-
ler IC which provides a highly accurate, programmable out-
put voltage for all high-performance processors. Two
interleaved synchronous buck regulator phases with built-in
current sharing operate 180° out of phase to provide the fast
transient response needed to satisfy high current applications
while minimizing external components. The FAN5193 fea-
tures remote voltage sensing and Programmable Active
Droop for 100nsec converter transient response with mini-
mum output capacitance. It has integrated high-current gate
drivers, with adaptive delay gate switching, eliminating the
need for external drive devices. The FAN5193 uses a 5-bit D/
A converter to program the output voltage from 1.10V to
1.85V in 25mV steps with an accuracy of 0.5%. The
FAN5193 uses a high level of integration to deliver load cur-
rents in excess of 50A from a 12V source with minimal
external circuitry. The FAN5193 also offers integrated func-
tions including Power Good, Output Enable/Soft Start,
under-voltage lockout,
over-voltage protection, and adjustable current limiting with
independent current sense on each phase. It is available in a
24 pin TSSOP package.
Block Diagram
23
OSC
Bypass
6
+12V
18
5V Reg
+
-
Digital
Control +12V
+12V +5V
13
14
15
17
+12V
-
-
+
+
-
+
16
VO
+12V +5V
12
+12V
11
-
Digital
10
+
Control +12V
8
5-Bit
Power
9
DAC
Good
1234 5
VID0 VID2 VID4
VID1 VID3
24
19
PWRGD
21
7
DROOP/E* GNDA
22
ENABLE/SS
20
ILIM
Pentium is a registered trademark of Intel Corporation. Athlon is a registered trademark of AMD. Programmable Active Droop is a trademark of Fairchild Semiconductor.
REV. 1.0.1 2/4/02
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