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PDF FAN5091 Data sheet ( Hoja de datos )
| Número de pieza | FAN5091 | |
| Descripción | Two Slice Interleaved Synchronous Buck Converter | |
| Fabricantes | Fairchild Semiconductor | |
| Logotipo |  |
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www.fairchildsemi.com
FAN5091
Two Slice Interleaved Synchronous Buck Converter
Features
• Programmable output from 1.10V to 1.85V in 25mV steps
using an integrated 5-bit DAC
• Two interleaved synchronous slices for maximum
performance
• 100nsec response time
• Built-in current sharing between slices
• Remote sense
• Programmable Active Droop (Voltage Positioning)
• 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 5V operation
• High efficiency mode (E*) at light load
• Overcurrent protection using MOSFET sensing
• 24 pin TSSOP package
Applications
• Power supply for Pentium IV
• Power supply for Athlon
• VRM for Pentium IV processor
• Programmable step-down power supply
Description
The FAN5091 is a synchronous multi-slice DC-DC controller
IC which provides a highly accurate, programmable output
voltage for all high-performance processors. Two interleaved
synchronous buck regulator slices with built-in current shar-
ing operate 180° out of phase to provide the fast transient
response needed to satisfy high current applications while
minimizing external components. The FAN5091 features
remote voltage sensing and Programmable Active Droop
for 100nsec converter transient response with minimum out-
put capacitance. It has integrated high-current gate drivers,
with adaptive delay gate switching, eliminating the need for
external drive devices. The FAN5091 uses a 5-bit D/A con-
verter to program the output voltage from 1.10V to 1.85V in
25mV steps with an accuracy of 1%. The FAN5091 uses a
high level of integration to deliver load currents in excess of
50A from a 5V source with minimal external circuitry. The
FAN5091 also offers integrated functions including Power
Good, Output Enable/Soft Start, under- voltage lockout,
over-voltage protection, and adjustable current limiting with
independent current sense on each slice. It is available in a
24 pin TSSOP package.
Block Diagram
23
OSC
5-Bit
DAC
Bypass
6
+12V
18
5V Reg
+
-
-
+
Power
Good
-
+
-
+
-
+
Digital
Control
+12V
Digital
Control
+12V
+12V
13
14
15
17
16
+12V
12
11
10
8
9
+5V
+5V
VO
1234 5
VID0 VID2 VID4
VID1 VID3
24 19
PWRGD
21 7
DROOP/E* GNDA
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. 1.0.0 5/10/01
1 page  
PRODUCT SPECIFICATION
FAN5091
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
0.5mΩ 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.
Table 1. Output Voltage Programming Codes
VID4
VID3
VID2
111
111
111
111
110
110
110
110
101
101
101
101
100
100
100
100
011
011
011
011
010
010
010
010
001
001
001
001
000
000
000
000
VID1
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
VID0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
VOUT to CPU
OFF
1.100V
1.125V
1.150V
1.175V
1.200V
1.225V
1.250V
1.275V
1.300V
1.325V
1.350V
1.375V
1.400V
1.425V
1.450V
1.475V
1.500V
1.525V
1.550V
1.575V
1.600V
1.625V
1.650V
1.675V
1.700V
1.725V
1.750V
1.775V
1.800V
1.825V
1.850V
Note:
1. 0 = VID pin is tied to GND.
1 = VID pin is open.
REV. 1.0.0 5/10/01
5
5 Page 
PRODUCT SPECIFICATION
FAN5091
Table 3. FAN5091 Application Bill of Materials for Figure 2
Reference Manufacturer Part # Quantity
Description
C1-3
Panasonic
ECU-V1H104ZFX
3 100nF, 50V Capacitor
CIN Rubycon
16ZL1000M
5 1000µF, 16V Electrolytic
COUT
Rubycon
6.3ZL1500M
8 1500µF, 6.3V Electrolytic
D1-2
Motorola
MBRB154SCT
2 15A, 45V Schottky Diode
L1 Any
Optional 1.3µH, 25A Inductor
L2-3
Q1, Q4
Q2-3, Q5-6
R1
R2
R3
R4
R5
R6-11
U1
Coiltronics
HC2-1R0
Fairchild
FDB7030BL
Fairchild
FDB7045L
Any
Any
Any
Any
Any
Any
Fairchild
FAN5091M
2 1µH, 33A Inductor
2 N-Channel MOSFET
4 N-Channel MOSFET
1 10KΩ
1 150KΩ
1 2.0KΩ
1 61.9KΩ
1 10Ω
6 4.7Ω
1 DC/DC Controller
Requirements/Comments
IRMS = 3.8A @ 65°C
ESR ≤ 23mΩ
DCR ~ 1mΩ
See Note 1.
DCR ~ 600µΩ
RDS(ON) = 9mΩ. See Note 2.
RDS(ON) = 4.5mΩ.See Note 2.
Notes:
1. Inductor L1 is recommended to isolate the 5V input supply from noise generated by the MOSFET switching. L1 may be
omitted if desired.
2. For a spreadsheet on MOSFET selections, refer to Applications Bulletin AB-8.
REV. 1.0.0 5/10/01
11
11 Page | ||
| Páginas | Total 21 Páginas | |
| PDF Descargar | [ Datasheet FAN5091.PDF ] | |
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