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PDF FAN5094 Data sheet ( Hoja de datos )
| Número de pieza | FAN5094 | |
| Descripción | Multi-Phase Interleaved Buck Converter | |
| Fabricantes | Fairchild Semiconductor | |
| Logotipo |  |
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www.fairchildsemi.com
FAN5094
Multi-Phase Interleaved Buck Converter
Features
• Programmable output from 1.100V to 1.850V in 25mV
steps using an integrated 5-bit DAC
• Two interleaved synchronous phases per IC for maximum
performance
• Up to 4 phase power system
• Built-in current sharing between phases and between ICs
• Frequency and phase synchronization between ICs
• Remote sense and Programmable Active Droop™
• High precision voltage reference
• High speed transient response
• Programmable frequency from 200KHz to 2MHz
• 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 efficiency mode at light load
• Overcurrent protection using MOSFET sensing
• 28 pin TSSOP package
Applications
• Power supply for Pentium®IV
• Power supply for Athlon®
• Power supply for Ultrasparc™
• VRM for Pentium IV processor
• Programmable step-down power supply
Block Diagram
VFB
+12V
Description
The FAN5094 is a synchronous multi-phase DC-DC
controller IC which provides a highly accurate,
programmable output 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. FAN5094s can be paralleled while maintaining
both frequency and phase synchronization and ensuring
current sharing in a high-power system. The FAN5094
features remote voltage sensing, Programmable Active
Droop and advanced response for optimal converter
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.
These make it possible to create power supplies running at a
switching frequency as high as 4MHz, for ultra-high density.
The FAN5094 uses a 5-bit D/A converter to program the
output voltage from 1.100V to 1.850V in 25mV steps with
an accuracy of 0.5%. The FAN5094 uses a high level of
integration to deliver load currents in excess of 150A from a
12V source with minimal external circuitry. The FAN5094
also offers integrated functions including Power Good,
Output Enable/Soft Start, under-voltage lockout, over-
voltage protection, and current limiting with independent
current sense on each phase. It is available in a 28-pin
TSSOP package.
FAN5094
+
PHASE
CLK ISHR
CLK ISHR
PHASE
+12V
+12V
FAN5094
+12V
VFB
+ Processor
VFB
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. 1.0.2 5/13/02
1 page  
PRODUCT SPECIFICATION
FAN5094
Electrical Specifications (continued)
(VCC = 12V, VOUT = 1.500V, and TA = +25°C using circuit in Figure 1, unless otherwise noted.)
The • denotes specifications which apply over the full operating temperature range.
Parameter
PWRGD Threshold
PWRGD Hysteresis
PWRGD Output Voltage
PWRGD Delay
12V UVLO
UVLO Hysteresis
12V Supply Current
Over Temperature Shutdown
Over Temperature Hysteresis
Conditions
Logic LOW, minimum
Logic LOW, maximum
Isink = 4mA
High → Low
HDRV and LDRV open
Min.
• 85
• 108
• 8.5
Typ.
88
111
20
500
9.5
1.0
20
150
25
Max.
92
115
0.4
10.5
Units
%Vout
mV
V
µsec
V
V
mA
°C
°C
Notes:
1. Steady State Voltage Regulation includes Initial Voltage Setpoint, Output Ripple and Output Temperature Drift and is
measured at the converter’s VFB sense point.
2. As measured at the converter’s VFB sense point. For motherboard applications, the PCB layout should exhibit no more than
0.2mΩ trace resistance between the converter’s output capacitors and the CPU. Remote sensing should be used for optimal
performance.
3. Using the VFB pin for remote sensing of the converter’s output at the load, the converter will be in compliance with Intel’s
VRM 9.0 specification of +70, -70mV.
REV. 1.0.2 5/13/02
5
5 Page 
PRODUCT SPECIFICATION
Application Circuit
+12V
L1 (Optional)
+12V
CIN
D1
+12V
+5V
D2
C4
D3
C5
R5
+12V
Q1
VID4
VID3
VID2
VID1
VID0
ENABLE/SS
C1
PWRGD
R1
+5V
C2
A
1 2 3 4 5 6 7 8 9 10 11 12 13 14
U1
FAN5094
28 27 26 25 24 23 22 21 20 19 18 17 16 15
R2 B
R3
R6
Q2
+12V
R7
Q3
R8
Q4
+12V
R4
C3
+12V
C6
A
1 2 3 4 5 6 7 8 9 10 11 12 13 14
U2
FAN5094
28 27 26 25 24 23 22 21 20 19 18 17 16 15
B
R9 R10
R12
R13
Q5
Q6
L2
L3
L4
FAN5094
VO
COUT
+12V
R11
C7
Figure 1. Three-Phase Application Circuit for 65A Willamette Processor
REV. 1.0.2 5/13/02
11
11 Page | ||
| Páginas | Total 22 Páginas | |
| PDF Descargar | [ Datasheet FAN5094.PDF ] | |
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