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5090MTC Datasheet PDF

5090MTC
Fairchild Semiconductor

Part Number 5090MTC
Description FAN5090MTC
Page 17 Pages
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www.fairchildsemi.com
FAN5090
Two Phase Interleaved Synchronous Buck Converter
for VRM 9.x Applications
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 transient response time
• Built-in current sharing between phases
• Remote sense
• Programmable Active Droop(Voltage Positioning)
• Programmable switching frequency from 100KHz to
300KHz per phase
• Adaptive delay gate switching
• Integrated high-current gate drivers
• Integrated Power Good, OV, UV, Enable/Soft Start
functions
• Drives N-channel MOSFETs
• Operation optimized for 12V operation
• Overcurrent protection using MOSFET sensing
• 24 pin TSSOP package
Applications
• Power supply for PentiumIV
• Power supply for Athlon
• VRM for Pentium IV processor
• Programmable step-down power supply
Description
The FAN5090 is a synchronous two-phase DC-DC controller
IC which provides a highly accurate, programmable output
voltage for VRM 9.x processors. Two interleaved synchro-
nous 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 FAN5090 features Programmable Active Droopfor
transient response with minimum output capacitance. It has
integrated high-current gate drivers, with adaptive delay gate
switching, eliminating the need for external drive devices.
The FAN5090 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 1%. The FAN5090 uses a high level of integra-
tion to deliver load currents in excess of 50A from a 12V
source with minimal external circuitry.
The FAN5090 also offers integrated functions including
Power Good, Output Enable/Soft Start, under-voltage lock-
out, 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
RT
OSC
5-Bit
DAC
1 23 4 5
VID0 VID2 VID4
VID1 VID3
BYPASS
+12V
6 18
5V Reg
UVL O
+ Digital
- Control
-
+
GNDA
Current
Limit
-
+
-
+
+12V
Power
Good
- Digital
+
Control
+12V
24 19
21 7
PWRGD DROOP/E* AGND
22
ENABLE/SS
20
ILIM
BOOT A
13
14
15
17
16
BOOT B
12
11
10
8
9
+12V
+12V
VO
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 9/16/03
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