www.fairchildsemi.com
FAN5093
Two Phase Interleaved Synchronous Buck Converter
for VRM 9.x Applications
Features
Description
• Programmable output from 1.10V to 1.85V in 25mV steps
using an integrated 5-bit DAC
• Two interleaved synchronous phases for maximum
performance
• 100nsec transient response time
• Built-in current sharing between phases
• Remote sense
• Programmable Active Droop (Voltage Positioning)
• Programmable switching frequency from 100KHz to
1MHz per phase
• 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 (E*) at light load
• Overcurrent protection using MOSFET sensing
• 24 pin TSSOP package
The FAN5093 is a synchronous two-phase DC-DC controller
IC which provides a highly accurate, programmable output
voltage for VRM 9.x 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.
The FAN5093 features Programmable Active Droop 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 FAN5093 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 1%. The FAN5093 uses a high level of integration to deliver load currents in excess of 50A from a 12V
source with minimal external circuitry.
The FAN5093 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 phase. It is available
in a 24 pin TSSOP package.
Applications
•
•
•
•
Power supply for Pentium IV
Power supply for Athlon
VRM for Pentium IV processor
Programmable step-down power supply
Block Diagram
+12V
BYPASS
6
23
BOOT A
18
+12V
13
OSC
UVL O
5V Reg
RT
+
-
+
14
Digital
Control
15
+12V
17
16
+
Current
Limit
VO
BOOT B
+
GNDA
12
+12V
11
Digital
Control
+
1 2 3 4 5
8
Power
Good
5-Bit
DAC
VID0 VID2 VID4
VID1 VID3
10
+12V
24
19
PWRGD
9
21
7
DROOP/E* AGND
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. 1.1.0 3/27/03
FAN5093
PRODUCT SPECIFICATION
Pin Assignments
VID0
VID1
VID2
VID3
VID4
BYPASS
AGND
LDRVB
PGNDB
SWB
HDRVB
BOOTB
1
2
3
4
5
6
7
8
9
10
11
12
FAN5093
24
23
22
21
20
19
18
17
16
15
14
13
VFB
RT
ENABLE/SS
DROOP/E*
ILIM
PWRGD
VCC
LDRVA
PGNDA
SWA
HDRVA
BOOTA
Pin Definitions
Pin Number
Pin Name
Pin Function Description
VID0-4
Voltage Identification Code Inputs. Open collector/TTL compatible inputs will
program the output voltage over the ranges specified in Table 1. Internally PulledUp.
6
BYPASS
5V Rail. Bypass this pin with a 0.1µF ceramic capacitor to AGND.
7
AGND
Analog Ground. Return path for low power analog circuitry. This pin should be
connected to a low impedance system ground plane to minimize ground loops.
8
LDRVB
Low Side FET Driver for B. Connect this pin to the gate of an N-channel
MOSFET for synchronous operation. The trace from this pin to the MOSFET gate
should optimally be
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