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FAN5093MTC Datasheet, PDF (1/17 Pages) Fairchild Semiconductor – Two Phase Interleaved Synchronous Buck Converter for VRM 9.x Applications | |||
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www.fairchildsemi.com
FAN5093
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 Droopï (Voltage Positioning)
⢠Programmable switching frequency from 100KHz to
1MHz 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
⢠High efï¬ciency mode (E*) at light load
⢠Overcurrent protection using MOSFET sensing
⢠24 pin TSSOP package
Applications
⢠Power supply for Pentiumï IV
⢠Power supply for Athlonï
⢠VRM for Pentium IV processor
⢠Programmable step-down power supply
Description
The FAN5093 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 FAN5093 features Programmable Active Droopï for
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 FAN5093 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 FAN5093 uses a high level of integra-
tion to deliver load currents in excess of 50A from a 12V
source with minimal external circuitry.
The FAN5093 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
BYPASS
+12V
23
RT
OSC
6
18
5V Reg
UVL O
+
Digital
-
Control
+12V
BOOT A
13
14
15
17
+12V
-
-
Current
+
+
Limit
-
GNDA
+
16
BOOT B
VO
12
+12V
11
-
Digital
10
+
Control
+12V
8
5-Bit
Power
Good
9
DAC
1 23 4 5
VID0 VID2 VID4
VID1 VID3
24
19
21
7
PWRGD DROOP/E* AGND
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. 1.1.0 3/27/03
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