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FAN5193 Datasheet

  • FAN5193

  • Two Phase Interleaved Synchronous Buck Converter

  • 21頁

  • FAIRCHILD

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www.fairchildsemi.com
FAN5193
Two Phase Interleaved Synchronous Buck
Converter
Features
鈥?Programmable output from 1.10V to 1.85V in 25mV steps
using an integrated 5-bit DAC
鈥?Two interleaved synchronous phases for maximum
performance
鈥?100nsec response time
鈥?Built-in current sharing between phases
鈥?Remote sense
鈥?Programmable Active Droop
餂?/div>
(Voltage Positioning)
鈥?Programmable frequency from 200KHz to 2MHz
鈥?Adaptive delay gate switching
鈥?Integrated high-current gate drivers
鈥?Integrated Power Good, OV, UVLO, 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 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擄 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
餂?/div>
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.
Applications
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
Power supply for Pentium
餂?/div>
IV
Power supply for Athlon
餂?/div>
VRM for Pentium IV processor
Programmable step-down power supply
Block Diagram
Bypass
6
5V Reg
+12V
18
13
23
+12V +5V
+12V
OSC
14
+
-
Digital
Control
15
+12V
17
16
VO
+12V +5V
12
11
+12V
-
+
-
+
-
+
-
+
Digital
Control
10
+12V
8
9
5-Bit
DAC
1 2 3 4
5
24
Power
Good
19
PWRGD
21
7
22
ENABLE/SS
20
ILIM
VID0 VID2 VID4
VID1 VID3
DROOP/E* GNDA
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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