FAN5059MX Datasheet, PDF (1/18 Pages) Fairchild Semiconductor – High Performance Programmable Synchronous DC-DC Controller for Multi-Voltage Platforms

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FAN5059
High Performance Programmable Synchronous
DC-DC Controller for Multi-Voltage Platforms
Features
• Programmable output for Vcore from 1.3V to 3.5V using
an integrated 5-bit DAC
• Controls adjustable linears for Vagp (selectable 1.5V/3.3V),
Vclock (2.5V), and Vtt (1.5V) or Vnorthbridge (1.8V)
• Meets VRM specification with as few as 5 capacitors
• Meets 1.550V +40/-70mV over initial tolerance,
temperature and transients
• Remote sense
• Programmable Active Droop™ (Voltage Positioning)
• Drives N-Channel MOSFETs
• Overcurrent protection using MOSFET sensing
• 85% efficiency typical at full load
• Integrated Power Good and Enable/Soft Start functions
• 24 pin SOIC package
Block Diagram
Applications
• Power supply for Pentium^® III Camino Platform
• Power supply for Pentium III Whitney Platform
• VRM for Pentium III processor
• Programmable multi-output power supply
Description
The FAN5059 is a synchronous mode DC-DC controller IC
which provides a highly accurate, programmable set of output
voltages for multi-voltage platforms such as the Intel Camino,
and provides a complete solution for the Intel Whitney and other
high-performance processors. The FAN5059 features remote
voltage sensing, independently adjustable current limit, and a
proprietary Programmable Active Droop^™ for optimal converter
transient response. The FAN5059 uses a 5-bit D/A converter
to program the output voltage from 1.3V to 3.5V. The
FAN5059 uses a high level of integration to deliver load
+3.3V
9
10
+1.5V
11
+
-
VCCP
+
-
12
+2.5V
OSC
REF
PWRGD,
OCL
REF
PWRGD,
OCL
+5V
VCCA 21
-
+
OCL
-
+
-
+
15
14
13
3.3/1.5V
+
V
-
-
+
PWRGD, OCL
5-Bit
DAC
1.24V
Reference
8 765 4
VID0VID2 VID4
VID1 VID3
-
+
3
GNDA
Digital
Control
16
ENABLE/SS
Power
Good
19
R_D
+12V
+5V
18
R_S
20
24 VCCP
1 HIDRV
2
23 LODRV
22
GNDP
17
PWRGD
VCC
Pentium is a registered trademark of Intel Corporation. Programmable Active Droop is a trademark of Fairchild Semiconductor.
Rev. 1.0.4