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FAN5098 Datasheet

  • FAN5098

  • Two Phase Interleaved Synchronous Buck Converter for AMD Ham...

  • 17頁

  • FAIRCHILD

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www.fairchildsemi.com
FAN5098
Two Phase Interleaved Synchronous Buck Converter
for AMD
廬
Hammer鈩?/div>
Features
鈥?Programmable output from 800mV to 1.550V in 25mV
steps using an integrated 5-bit DAC
鈥?Two interleaved synchronous phases for maximum
performance
鈥?100nsec transient response time
鈥?Built-in current sharing between phases
鈥?Remote sense
鈥?Programmable Active Droop
餂?/div>
(Voltage Positioning)
鈥?Programmable switching frequency from 100KHz to
1MHz per phase
鈥?Adaptive delay gate switching
鈥?Integrated high-current gate drivers
鈥?Integrated Power Good, OV, UV, Enable/Soft Start
functions
鈥?Drives N-channel MOSFETs
鈥?Operation optimized for 12V operation
鈥?High ef鏗乧iency mode (E*) at light load
鈥?Overcurrent protection using MOSFET sensing
鈥?24 pin TSSOP package
Description
The FAN5098 is a synchronous two-phase DC-DC controller
IC which provides a highly accurate, programmable output
voltage for the AMD
廬
Hammer鈩?processor. Two inter-
leaved synchronous buck regulator phases with built-in cur-
rent sharing operate 180擄 out of phase to provide the fast
transient response needed to satisfy high current applications
while minimizing external components.
The FAN5098 features Programmable Active Droop
餂?/div>
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 FAN5098 uses a 5-bit D/A converter to program the out-
put voltage from 800mV to 1.550V in 25mV steps with an
accuracy of 1%. The FAN5098 uses a high level of integra-
tion to deliver load currents in excess of 50A from a 12V
source with minimal external circuitry.
The FAN5098 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.
Applications
鈥?VRM/VRD for 64-Bit Athlon鈩?and Opteron鈩?CPU鈥檚
鈥?VRM/VRD for Advanced CPU鈥檚
鈥?Programmable step-down power supply
Block Diagram
BYPASS
6
23
R
T
+12V
18
5V Reg
UVL O
BOOT A
13
+12V
OSC
14
+
-
Digital
Control
15
+12V
17
16
BOOT B
VO
+12V
-
+
GNDA
Current
Limit
-
+
-
+
-
+
12
11
Digital
Control
10
+12V
8
9
5-Bit
DAC
1 2 3 4 5
VID0 VID2 VID4
VID1 VID3
24
Power
Good
19
PWRGD
21
7
22
ENABLE/SS
20
ILIM
DROOP/E* AGND
Athlon鈩?and Hammer鈩?are registered trademarks of AMD
廬
. Programmable Active Droop is a trademark of Fairchild Semiconductor.
REV. 1.0.7 2/18/03

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