Dual Voltage Controller for DSP Power
Description
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fairchildsemi.
com
FAN5038
Dual Voltage Controller for DSP Power
Features
• Provides complete, low-cost core and I/O power in single chip • I/O power sequencing • Core voltage adjustable from 1.
5V to 3.
6V • Independent adjustable current limits • Core up to 13A, I/O up to 5A • Precision trimmed low TC voltage reference • Constant On-Time oscillator • Small footprint 16 lead SOIC package
Description
The FAN5038 provides a complete low-cost power system for DSPs and other loads requiring high-performance.
The FAN5038 combines an adjustable switch-mode DC-DC converter for core power with a low-dropout linear regulator for I/O power in a space-saving SO-16 package.
Simple external circuitry provides power sequencing and independent current limits.
An internal precision voltage reference allows the switcher to be adjusted from 1.
5V to 3.
6V.
With the appropriate external components, the FAN5038 can deliver core power up to 13A, and I/O power up to 5A, allowing multiple DSPs to be powered with a single device.
Applications
• High efficiency low-cost power for DSPs • Power for ASICs and FPGAs • Programmable dual power supply for high current loads
Block Diagram
+12V +5V
Switching Regulator
Switcher Select Oscillator
Feedback Control
Digital Logic
Core
Linear Enable
Linear Regulator
1.
5V Reference + –
I/O
FAN5038
REV.
1.
0.
2 7/6/00
FAN5038
PRODUCT SPECIFICATION
Pin Assignments
LIN_EN VREF IFBH IFBL FBSW VCCA VFBL GNDP 1 2 3 4 5 6 7 8 16 15 14 13 12 11 10 9 SWCTRL CEXT GNDA VSCL LDRV VCCL VCCP SDRV
Pin Descriptions
Pin Name LIN_EN VREF Pin Number 1 2 Pin Function Description Linear regulator enable input.
Accepts TTL/open collector input levels.
A logic level HIGH on this pin disables the output of the linear regulator.
Voltage reference test point.
This pin provides access to the internal precision 1.
5V bandgap reference and should be decoupled to ground using a 0.
1µF ceramic capacitor.
No load should be connected to this pin.
High side current feedback for ...
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