5-BIT PROGRAMMABLE VOLTAGE REFERENCE P R O D U C T I O N D ATA S H E E T

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1 LIN DOC #: 10 T HE I N F I N I T E P O W E R OF I N N O V A TION DESCRIPTION KEY FEATURES The is a complete precision reference and voltage monitor circuit for the Intel Pentium Pro Processor and other high-end microprocessor supplies. It is designed for use in conjunction with the LX/11 PWM controller. The reads a -bit voltage identification (VID) code from the microprocessor and sets the output voltage reference to be used by the LX/1 controller. Together, they convert + or 1V input power to an adjustable output ranging from 1.8VDC to.vdc in 0mV steps (0mV steps below.1v) with 1% DC system accuracy. p 1% TOTAL OUTPUT ERROR p POWER GOOD, UV, 0V COMPARATORS p 0V COMPARATOR HAS SCR DRIVE p UNDER-VOLTAGE LOCKOUT CAPABILITY p -BIT INPUT FOR ADVANCED PENTIUM PRO PROCESSOR APPLICATIONS ( TH BIT IS FOR AUTOMATIC GAIN AND OFFSET SCALING) p IMPLEMENTS 1% DC ACCURATE CONTROL SYSTEM p 1-PIN NARROW BODY SOIC PACKAGE PRODUCT HIGHLIGHT T YPICAL APPLICATION OF THE APPLICATIONS PENTIUM II & PENTIUM PRO VOLTAGE REGULATOR MODULES PROGRAMMABLE POWER SUPPLIES VOLTAGE REFERENCE ADVANCED MICROPROCESSOR SUPPLIES -Bit Digital Input Word BIT 0 BIT 1 BIT BIT BIT Enable To PWM Error Amplifier SCR Drive Blank Enable Power Good System Output Voltage PACKAGE ORDER INFO T A ( C) D Plastic SOIC 1-pin 0 to 0 CD Note: All surface-mount packages are available in Tape & Reel. Append the letter "T" to part number. (i.e. CDT) FOR FURTHER INFORMATION CALL (1) WESTERN AVENUE, GARDEN GROVE, CA

2 ABSOLUTE MAXIMUM RATINGS (Note 1) PACKAGE PIN OUTS Supply Voltage ( ) V to +1V, -,,, V to +0.,, V to +V... -ma... -ma Operating Junction Temperature Plastic (D Package) C Storage Temperature Range... - C to +10 C Lead Temperature (Soldering, Seconds) C D PACKAGE (Top View) B Note 1. Exceeding these ratings could cause damage to the device. All voltages are with respect to Ground. Currents are positive into, negative out of the specified terminal. Pin numbers refer to DIL packages only. THERMAL DATA D PACKAGE: THERMAL RESISTANCE-JUNCTION TO AMBIENT, θ JA C/W Junction Temperature Calculation: T J = T A + (P D x θ JA ). The θ JA numbers are guidelines for the thermal performance of the device/pc-board system. All of the above assume no ambient airflow

3 ELECTRICAL CHARACTERISTICS (Unless otherwise specified, these specifications apply over the operating ambient temperatures for C with 0 C T A 0 C ;.8V < < 1.V, - = Open, = Open, = 1, = 1. Nominal conditions: = 1.0V, T = C. Currents flowing into chip are positive. Current maximums are currents with the highest possible value.) Parameter Symbol Test Conditions Units Min. Typ. Max. Power Supply Current and Power Section Positive 1V Supply Current I CC All outputs, inputs unloaded Digital-to-Analog Converter Section (Includes DAC, I-V Converter and output scaling amplifier. R LOAD > 1k, C LOAD < 0pF) Voltage Set Point Accuracy VSPA - = X, = Open,.00.0V - = X, =, V LSB VSTP = Open = Coding Binary, = LSB, = MSB Under-Voltage Lockout Section Power-up Reset V RES I GOOD = ma Threshold UVLOT = V, Supply ramping down Hysteresis UVLOH = V, Supply ramping up Under/Over-Voltage Comparator Section Percent of Threshold UOVTH Low Voltage VLG I GOOD = ma Over-Voltage Protection Comparator Section Percent of Threshold OVPTH OVP Sourcing Current IOVP OVP =.0V OVP Output Low VLOVP IOVP = 0µA TTL Inputs Section Input Low Voltage V IL Input High Voltage V IH Input Low Current I IL V IL = 0.8V Input High Current I IH V IH =.0V Open Drain Inputs Section (-, ) Input Low Current I IL Pin Ground Input High Voltage V IH Pin Open ma % % 0 mv 0 mv 1.0 V... V 0 mv ±. ± ±8. % V 1 0 % -0 ma 0 mv 0.8 V.0 V - µa 0 µa -. µa.0 V

4 FUNCTION TABLES Table 1 - Input vs. Output Functions - (V S ) (V O ) < 1.0 X X X X Undefined Undefined Undefined 1.0 < < UVLOT X X X X LOW LOW LOW > UVLOT X 0 X X LOW LOW LOW > UVLOT Table 1 0 V S < 0.9V O Table LOW LOW > UVLOT Table V O < V S < 1.0V O Table HIGH LOW > UVLOT Table V O < V S < 1.1V O Table LOW LOW > UVLOT Table 1 0 V S > 1.1V O Table LOW HIGH > UVLOT Table 1 1 V S < 0.9V O Table LOW LOW > UVLOT Table V O < V S < 1.0V O Table HIGH LOW > UVLOT Table V O < V S < 1.1V O Table LOW LOW > UVLOT Table 1 1 V S > 1.1V O Table LOW HIGH Table - Output ( pulled high or left open) Table - Output ( pulled low) Table - Mode Control Mode State X 0 X Disable is pulled low through k Low is scaled. Output 1.V to.0v Normal Normal Output.0 to.v Low is scaled. Output 1.8V to.0v Normal Normal output.0 to.v

5 BLOCK DIAGRAM 8 9 BLOCK < 1.8V DAC V REF./.V./.1V 1 11 B * VS 1 S 1 0 X1 MUX OUT 0.9 * VS 0.9 * VE VE VS 1 FUNCTIONAL PIN DESCRIPTION Pin Name Pin # Description B 1 1 Output reference voltage used by PWM controller to set system voltage. Connected directly to system output voltage. Open collector output pulls low when the processor's supply is not good. SCR Driver goes high when processor supply is over voltage. TTL compatible chip enable. Internally pulled high. Enables or disables blocking of codes with voltage blow 1.8V for CPU protection. Internally pulled high. Analog ground return. LSB DAC logic control. Internally pulled high. nd LSB DAC logic control. Internally pulled high. rd LSB DAC logic control. Internally pulled high. MSB DAC logic control. Internally pulled high. Scales output when low. Internally pulled high. Inverting output of. Analog power supply.

6 THEORY OF OPERATION UNDER-VOLTAGE LOCKOUT This function keeps order to the IC until the power supply voltage reaches 8% of its nominal value. The output voltage is pulled low and and are pulled low. Once the power supply voltage crosses 8%, the output voltage,, is released, and continues to be pulled low. When (the microprocessor's power supply) is within ±% of, is released. The comparator has hysteresis to prevent transient oscillation. -BIT DAC and th-bit SCALER This function generates a precise voltage from a binary, -bit digital word VID [0:]. It uses a -bit, binary weighted current DAC, driving a precise current to voltage converter. This voltage is then op-amp buffered and sent out. The scaling is accomplished by multiplexing the buffer op-amp. The resulting transfer function is: (,,,) = ( * (1* + * + * + 8*)) for = 1 OVER- / UNDER-VOLTAGE COMPARATORS This function generates an open collector Power Good signal when is within ±% of. OVER-VOLTAGE PROTECTION This function generates an voltage signal when is 1% higher than. This voltage can be used to drive an external SCR. CHIP This function disables the chip when low., and are all pulled low. When is high, the chip's state is then determined by the other functions. BLANK This function will disable for codes with voltages below 1.80V when this pin is high. When pulled low, this function will allow to accept codes for voltages of 1.0 to.0v. (,,,) = ( * (1* + * + * + 8*)) * 0. for = 0 for the code < 1.8V will be blocked and = 0. The zero-scale output voltage, full-scale output voltage and the scale factor are all trimmed on-chip using fusable links.

7 APPLICATION INFORMATION See Note 1 1N18 1N18 C0 F1 1A V JP1 JP 1V IN V IN See Note 1 JP JP R1 Q1 IRL C 100µF.V C11 100µF.V PWRGD OUTEN 1 C B VI VI VI VI VI R K C R C R C 90µF C8 80pF VRM CONTROLLER 1 EN V 1 C1 OT ADJ TDRV 1 P 1 S V VREF BDRV 1 INV V 1 CC NINV/SS SYNCEN 11 HICCUP CS+ 8 C T CS- 9 LX11 R C9 1µF R8 C1 90pF R R C19 Q IRL See Note 1 L1 TOROID µh R1 mω C 100µF.V C1 Q N0 100µF.V C1 100µF.V Note 1. Setup shown is for V application. For 1V input change the following: - Close JP1 and JP - Open JP and JP - For C and C11, use 1V/80µF capacitors instead - Inductor L1 = µh SUPPLY OUTPUT CLAMP FIGURE 1 LX/1 CONTROLLER USED WITH THE PROGRAMMABLE REFERENCE/DAC CHIP FOR PENTIUM PRO PROCESSOR OR PENTIUM II PROCESSOR APPLICATIONS. GUARANTEED TO MEET INTEL SPECIFICATIONS. Pentium is a registered trademark of Intel Corporation. PRODUCTION DATA - Information contained in this document is proprietary to Linfinity, and is current as of publication date. This document may not be modified in any way without the express written consent of Linfinity. Product processing does not necessarily include testing of all parameters. Linfinity reserves the right to change the configuration and performance of the product and to discontinue product at any time.

PRODUCTION DATA SHEET

PRODUCTION DATA SHEET The positive voltage linear regulator is configured with a fixed 3.3V output, featuring low dropout, tight line, load and thermal regulation. VOUT is controlled and predictable as UVLO and output slew