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| www.fairchildsemi.com FAN1654 1.5A LDO, DDR Bus Termination Regulator Features * * * * * * * * Sinks and sources 1A continuous, 1.5A peak -40C to +125C Operating Range Load regulation: (VDDQ/2) 40mV 5mA VREF buffer tracks VTT On-chip thermal limiting Power-enhanced eTSSOPTM-16 package Low Current Shutdown Mode Output Short Circuit Protection Description The FAN1654 is a low-cost bi-directional LDO specifically designed for terminating DDR memory bus. It can both sink and source up to 1A continuous, 1.5A peak, providing enough current for most DDR applications. Load regulation meets the JEDEC spec, VTT = (VDDQ/2) 40mV. The FAN1654 includes a buffered reference voltage capable of supplying up to 5mA current. On-chip thermal limiting provides protection against a combination of power overload and ambient temperature that would create an excessive junction temperature. A shutdown input puts the FAN1654 into a low power mode for laptop computer applications. The FAN1654 regulator is available in a power-enhanced eTSSOPTM-16 package, and the standard SOIC-14 Applications * DDR terminators Block Diagram VDDQ 200k VREFOUT VREFIN + VTTFORCE + VTTFORCE 200k VTTSENSE FAN1655 VSSQ VSS VSS VSS VDD VDD VDD SHDN REV. 1.0.5 4/17/02 PRODUCT SPECIFICATION FAN1654 Pin Assignments VDD VDD VTTFORCE VSS VSS VTTFORCE VDD VSS 1 2 3 4 5 6 7 8 FAN1654 16 15 14 13 12 11 10 9 NC VDDQ VREFOUT VSSQ SHDN VREFIN VTTSENSE NC VSSQ VREFOUT VDDQ VDD VDD VTTFORCE VSS 1 2 3 4 5 6 7 FAN1654 14 13 12 11 10 9 8 SHDN VREFIN VTTSENSE VSS VDD VTTFORCE VSS 16-Lead Plastic eTSSOP-16 JC = 4C/W* *With package power slug soldered to 0.5 square inch copper area over backside ground plane of internal power plane 14-Lead Plastic SOIC JC = 37C/W, JA = 88C/W Pin Definitions Pin Number* 1, 2, 7 (4, 5, 10) 3, 6 (6, 9) 4, 5, 8 (7, 8, 11) 10 (12) 11 (13) 12 (14) Pin Name VDD VTTFORCE VSS VTTSENSE VREFIN SHDN VTT Force Output. Power Ground. VTT Sense. Feedback for remote sense of the VTT voltage. VREFIN. Alternative input for direct control of VTTOUT and VREFOUT. Shutdown. This active low shutdown turns off both VTT and VREFOUT. This pin has an internal pull-down, and must be externally driven high for the IC to be on. Signal Ground. Buffered Voltage Reference Output. VDDQ Input. Attach this pin to the VDDQ supply to generate VTT and VREFOUT. No Internal Connection Pin Function Description VDD. Input power for the LDO. 13 (1) 14 (2) 15 (3) 9,16 VSSQ VREFOUT VDDQ NC * Pin Numbers in brackets are for the SOIC-14 package Typical Application VDDQ VDD VTTFORCE 470F 1 2 3 4 FAN1654 5 6 7 8 10F 16 15 14 13 12 11 10 9 1nF 10k 10F VREFOUT SHDN VTTSENSE GND 100F 6V 1nF (connect to VTTFORCE at the load) GND Figure 1. (eTSSOP pinout shown) 2 REV. 1.0.5 4/17/02 FAN1654 PRODUCT SPECIFICATION Typical Performance Characteristics Quiescent Current vs. Temperature 3.5 VREF Output Change vs. IREF 1.0 3 QUIESCENT CURRENT (mA) VDD = VDDQ = 2.5V TA = 25C 0.5 VREFOUT (mV) 2.5 2 1.5 ROUT = 0.2 0 -0.5 1 .5 0 -60 -1.0 -6 -40 -20 0 20 40 60 80 100 120 140 -5 -4 -3 -2 -1 0 1 2 3 4 5 6 VREF LOAD CURRENT (mA) AMBIENT TEMPERATURE (C) Figure 2 Figure 3 VTT Load Current 1.260 VDD = VDDQ = 2.5V TA = 25C 1.255 VTT OUTPUT (V) 1.250 1.245 1.240 -1500 -1000 -500 0 500 1000 1500 VTT Load Current (mA) Figure 4 REV. 1.0.5 4/17/02 3 PRODUCT SPECIFICATION FAN1654 Absolute Maximum Ratings Supply Voltage VDD, VDDQ Junction Temperature, TJ Storage Temperature Lead Soldering Temperature, 10 seconds Power Dissipation, PD 6V 150C -65 to 150C 300C 1.4W Recommended Operating Conditions Parameter Supply Voltage VDD Supply Voltage VDDQ Ambient Operating Temperature VREFIN Conditions Min. 2.3 2.2 -40 1.1 1.25 Typ. 2.5 2.5 Max. 3.6 3.0 125 1.5 Units V V C V Electrical Characteristics (VDD = VDDQ = 2.5V 0.2V, and TA = 25C using circuit in Figure 1, unless otherwise noted.) The * denotes specifications which apply over the specified operating temperature range. Parameter VTT Output Voltage Conditions IOUT = 0A, VREFIN = open VDDQ = 2.3V VDDQ = 2.5V VDDQ = 2.7V IOUT = +1A, VREFIN = open VDDQ = 2.3V VDDQ = 2.5V VDDQ = 2.7V Cload = 10F SHDN = 0V Min. * * * 1.135 1.235 1.335 1.110 1.210 1.310 Typ. 1.150 1.250 1.350 1.150 1.250 1.350 0.1 * -50 2 100 No load VREFIN = 1.150V * VREFIN = 1.250V * VREFIN = 1.350V * VDDQ = 2.3V * SHDN = 0V * * * No load, SHDN = 2.7V * SHDN = 0V * SHDN = 0V * SHDN = 2.7V * 1.145 1.245 1.345 -5 -10 1.667 1.150 1.250 1.350 1.155 1.255 1.355 5 10 0.800 10 10 50 75 V V V mA A V V mA A A A C C 50 Max. 1.165 1.265 1.365 1.190 1.290 1.390 Units V V V V V V V/sec A A K VTT Output Slew Rate VTT Leakage Current VTT Current Limit VREFIN Input Impedance VREFOUT Output Voltage VREFOUT Output Current VREFOUT Leakage Current SHDN Logic High SHDN Logic Low IDD Supply Current VDDQ Leakage Current VDD Leakage Current SHDN Input Current Over-Temperature Shutdown Over-Temperature Hysteresis 3 6 3 50 155 30 4 REV. 1.0.5 4/17/02 FAN1654 PRODUCT SPECIFICATION Mechanical Dimensions 16 Lead eTSSOP 0.10 TYP 16 5.0 0.1 9 -A4.00 -B16 9 6.4 4.4 0.1 3.40 3.2 4.16 7.72 1 8 0.2 C B A ALL LEAD TIPS PIN #1 IDENT. (1.78) 1 8 1.2 MAX ALL LEAD TIPS 0.1 C +0.15 (0.90) -0.10 0.65 TYP 0.42 TYP LAND PATTERN RECOMMENDATION -C0.65 TYP 0.100.05 TYP (0.19-0.30) 0.10 M C B A SEE DETAIL A (0.09-0.20) 1.7 MIN 9 16 1.5 MIN 12 TOP & BOTTOM R0.09MIN 0-8 GAGE PLANE 0.25 8 1 BOTTOM VIEW 0.75 0.45 (1.00) SEATING PLANE DETAIL A NOTES: A. CONFORMS TO JEDEC REGISTRATION MO-153, VARIATION ABT, DATED 10/97. B. DIMENSIONS ARE IN MILLIMETERS. C. DIMENSIONS ARE EXCLUSIVE OF BURRS, MOLD FLASH, AND THE BAR EXTENSIONS. D. DIMENSIONS AND TOLERANCES PER ASME Y14.5M, 1994. REV. 1.0.5 4/17/02 5 PRODUCT SPECIFICATION FAN1654 Mechanical Dimensions 14-Lead SOIC NOTES: 1. This package conforms to JEDEC MS-012, variation AB, ISSUEC dated May, 1990. 2. All dimensions are in millimeters 3. Standard lead finished 200 microinches / 5.08 microns min. Lead/Tin (solder) oncopper S8.71-8.51; 7.62 14 13 12 11 10 9 8 0.50 5.75 1.00 S6.20-5.80; S4.00-3.80 1 2 3 4 1.27 5 6 7 S0.51-0.35; 1.27 7.62 LAND PATTERN RECOMMENDATION S0.50-0.25;X45 S0.25-0.10;z S1.75-1.35; S0.25-0.19; S8-0 S1.27-0.40; SEATING PLANE 6 REV. 1.0.5 4/17/02 PRODUCT SPECIFICATION FAN1654 Ordering Information Product Number FAN1654MTF FAN1654MTFX FAN1654M FAN1654MX Package eTSSOP-16 eTSSOP-16 in tape and reel SOIC-14 SOIC-14 in tape and reel LIFE SUPPORT POLICY FAIRCHILD'S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT OF FAIRCHILD SEMICONDUCTOR CORPORATION. As used herein: 1. Life support devices or systems are devices or systems which, (a) are intended for surgical implant into the body, or (b) support or sustain life, and (c) whose failure to perform when properly used in accordance with instructions for use provided in the labeling, can be reasonably expected to result in a significant injury of the user. 2. A critical component in any component of a life support device or system whose failure to perform can be reasonably expected to cause the failure of the life support device or system, or to affect its safety or effectiveness. www.fairchildsemi.com 4/17/02 0.0m 004 Stock#DS30004854 2002 Fairchild Semiconductor Corporation |
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