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 packageApplication• Power supply for PentiumIV
• Power supply for Athlon
• VRM for Pentium IV processor
• Programmable step-down power supply
Specifications
|
Parameter |
Min. |
Typ. |
Max. |
Unit |
|
Supply Voltage VCC |
|
|
15 |
V |
|
Supply Voltages BOOT to BOOTB |
|
|
24 |
v |
|
Voltage Identification Code Inputs, VID0-VID4 |
|
|
6 |
v |
|
VFB, ENABLE/SS, PWRGD, DROOP/E* |
|
|
6 |
v |
|
SWA, SWB |
-3 |
|
15 |
v |
|
PGNDA, PGNDB to AGND |
-0.5 |
|
0.5 |
v |
|
Gate Drive Current, peak pulse |
|
3 |
3 |
A |
|
Junction Temperature, TJ |
-55 |
|
150 |
°C |
|
Storage Temperature |
-65 |
|
150 |
°C |
|
Lead Soldering Temperature, 10 seconds |
|
300 |
|
°C |
|
Power Dissipation, PD |
|
950 |
|
mW |
|
Thermal Resistance Junction-to-Case,ÈJC |
|
13 |
|
°C/W |
DescriptionThe FAN5098 is a synchronous two-phase DC-DC controller IC which provides a highly accurate, programmable output voltage for the AMD ® Hammer™ processor. 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 FAN5098 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 FAN5098 uses a 5-bit D/A converter to program the output voltage from 800mV to 1.550V in 25mV steps with an accuracy of 1%. The FAN5098 uses a high level of integration to deliver load currents in excess of 50A from a 12V source with minimal external circuitry.
The FAN5098 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.
FAN5091 Data Sheet
