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PDF FAN5092 Data sheet ( Hoja de datos )
| Número de pieza | FAN5092 | |
| Descripción | High Current System Voltage Buck Converter | |
| Fabricantes | Fairchild Semiconductor | |
| Logotipo |  |
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www.fairchildsemi.com
FAN5092
High Current System Voltage Buck Converter
Features
• Output from 1.1V to 5V
• Integrated high-current gate drivers
• 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 Power Good, OV, UV, Enable/Soft Start
functions
• Drives N-channel MOSFETs
• Operation optimized for 12V
• High efficiency mode at light load
• Overcurrent protection using MOSFET sensing
• 28 pin TSSOP package
Applications
• Power supply for Logic
• Modular Power supply
Description
The FAN5092 is a synchronous multi-slice DC-DC
controller IC which provides a highly accurate,
programmable output voltage for all high-current
applications. 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. FAN5092s can be paralleled while maintaining
both frequency and phase synchronization and ensuring
current sharing in a high-power system. The FAN5092
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 output voltage can be set from 1.1V to 5V with an
accuracy of 0.5%. The FAN5092 uses a high level of
integration to deliver load currents in excess of 150A from a
12V source with minimal external circuitry. The FAN5092
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 slice. It is available in a 28-pin TSSOP
package.
Block Diagram
+12V
VFB
FAN5092
+
PHASE
CLK ISHR
CLK ISHR
PHASE
+12V
+12V
FAN5092
+12V
VFB
+ 3.3V @ 120A
VFB
Programmable Active Droop is a trademark of Fairchild Semiconductor.
REV. 1.0.7 6/20/02
1 page  
PRODUCT SPECIFICATION
FAN5092
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
BYPASS Capacitor
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.
220
• 81
• 108
• 8.5
Typ.
1000
85
111
20
500
9.5
1.0
20
150
25
Max.
89
115
0.4
10.5
Units
nF
%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. Remote sensing should be used for optimal performance.
REV. 1.0.7 6/20/02
5
5 Page 
PRODUCT SPECIFICATION
Application Circuit
+12V
L1 (Optional)
+12V
CIN
D1
+12V
+5V
D2
C4
D3
C5
R5
+12V
Q1
R6
Q2
C2
A
ENABLE/SS
C1
PWRGD
R1
+5V
1 2 3 4 5 6 7 8 9 10 11 12 13 14
U1
FAN5092
28 27 26 25 24 23 22 21 20 19 18 17 16 15
B
R2 R3
+12V
R4
C3
+12V
R7
Q3
R8
Q4
+12V
C6
A
1 2 3 4 5 6 7 8 9 10 11 12 13 14
U2
FAN5092
28 27 26 25 24 23 22 21 20 19 18 17 16 15
B
R9 R10
+12V
R11
C7
R12
R13
Q5
Q6
+12V
R14
R15
Q7
Q8
L2
L3
L4
L5
FAN5092
COUT
3.3V@60A
R16
R17
Figure 1. Four-Phase Application Circuit
REV. 1.0.7 6/20/02
11
11 Page | ||
| Páginas | Total 20 Páginas | |
| PDF Descargar | [ Datasheet FAN5092.PDF ] | |
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