SC1112_06 SEMTECH [Semtech Corporation], SC1112_06 Datasheet
SC1112_06
Related parts for SC1112_06
SC1112_06 Summary of contents
Page 1
POWER MANAGEMENT Description The SC1112 was designed for the latest high speed motherboards. It includes three low dropout regulator con- trollers. The controllers provide the power for the system AGTL bus Termination Voltage, Chipset, and clock circuitry. An adjustable controller ...
Page 2
POWER MANAGEMENT Absolute Maximum Ratings Exceeding the specifications below may result in permanent damage to the device, or device malfunction. Operation outside of the parameters specified in the Electrical Characteristics section is not implied ...
Page 3
POWER MANAGEMENT Electrical Characteristics (Cont.) Unless specified: 5VSTBY=4.75V to 5.25V; VTTIN=3.3V ...
Page 4
POWER MANAGEMENT Timing Diagrams The delay capacitor does not begin charging until VTTIN has reached 1.5V and VTT is above the powergood threshold of 1.08V. Once DELAY reaches 1.5V, the PWRGD signal goes high. VTTGATE initially turns on hard, until ...
Page 5
POWER MANAGEMENT Timing Diagrams (Cont.) Once VTT drops out of regulation, VTTGATE turns on harder to try and raise VTT. When VTT drops below 1.08V, the delay capacitor is discharged and PWRGD goes low. When VTT drops below 0.7V, the ...
Page 6
POWER MANAGEMENT Pin Configuration Top View 5VSTBY 1 16 PWRGD 15 2 DELAY 3 14 VTTSEL 4 13 AGPSEL 5 12 ADJGATE 6 11 ADJSEN 7 10 CAP (16-Pin SOIC or TSSOP) 2006 Semtech Corp. Ordering Information P ...
Page 7
POWER MANAGEMENT Pin Descriptions ...
Page 8
POWER MANAGEMENT Block Diagram 5VSTBY Bandgap Reference + - VTTIN DELAY _ + PWRGD 2006 Semtech Corp. VTTSEL 1.5V 1.35V Disable1.5 1. 1.08V Vref 0. 1.5V Disable1 Vref 0.7V Oscillator + ...
Page 9
POWER MANAGEMENT Typical Characteristics VTT(1.5V) Output Voltage @ 1.5055 1.5050 1.5045 1.5040 1.5035 1.5030 1.5025 1.5020 1.5015 (°C.) VTT(1.25V) Output Voltage @ 1.2485 1.2480 ...
Page 10
POWER MANAGEMENT Typical Characteristics (Cont.) VTT Gate Current @ Vgate = 3V, 5V Stby = 4.75V vs Ta 800 750 700 650 600 550 500 450 400 (°C.) 2006 Semtech Corp. VTT Short circuit ...
Page 11
POWER MANAGEMENT Typical Characteristics (Cont.) VTT (1.25V) Power Good Threshold vs Ta 1.098 1.096 1.094 1.092 1.090 1.088 1.086 1.084 1.082 1.080 (°C.) VTT (1.5V) Power Good Threshold vs Ta 1.361 1.360 1.359 1.358 ...
Page 12
POWER MANAGEMENT Typical Characteristics (Cont.) AGP (1.5V) Output Voltage @ 1.5055 1.5050 1.5045 1.5040 1.5035 1.5030 1.5025 1.5020 1.5015 1.5010 1.5005 (°C.) AGP (3.3V) Output Voltage @ Io = ...
Page 13
POWER MANAGEMENT Typical Characteristics (Cont.) ADJ (1.2V) Output Voltage @ 1.2020 1.2010 1.2000 1.1990 1.1980 1.1970 1.1960 1.1950 (°C.) ADJ Sense Bias current vs Ta 350 330 310 290 ...
Page 14
POWER MANAGEMENT Typical Characteristics (Cont Stby vs Ta 7.50 7.30 7.10 6.90 6.70 6.50 6.30 6.10 5.90 5.70 5. (°C.) Line Regulation VTTIN = 3.13V to 3.47V ...
Page 15
POWER MANAGEMENT Typical Gain & Phase Margin SC1112 Gain / Phase VTT = 1.25V @ Gain 40 30 Phase -10 -20 -30 10 100 1000 10000 Freq (Hz) SC1112 Gain / Phase ADJ = ...
Page 16
POWER MANAGEMENT Applications Infomation Theory Of Operation The SC1112 was designed for the latest high speed mother boards requiring a controlled power up sequencing of the Outputs, and a programmable delay for the Power good signal. Three Linear controllers have ...
Page 17
POWER MANAGEMENT Applications Infomation (Cont.) SC1112 5VSTBY ADJGATE ADJSEN CAP- CAP+ FC DELAY PWRGD VTT SELECT Signal Figure 1: Adjusting The Output Voltage of VTT or AGP Adjustable Output Voltage Option The adjustable output voltage option does not have an ...
Page 18
POWER MANAGEMENT Applications Infomation (Cont.) Short Circuit Protection The VTT short circuit protection feature of the SC1112 is implemented by using the R DS(ON) the output current increases, the regulation loop main- tains the output voltage by turning the FET ...
Page 19
POWER MANAGEMENT Evaluation Board Gerbers Board Layout Assembly Top Board Layout Top 2006 Semtech Corp. Board Layout Assembly Bottom Board Layout Bottom 19 SC1112 www.semtech.com ...
Page 20
POWER MANAGEMENT Evaluation Board Schematic 2006 Semtech Corp. 20 SC1112 www.semtech.com ...
Page 21
POWER MANAGEMENT Evaluation Board Bill of Materials ...
Page 22
POWER MANAGEMENT Outline Drawing - TSSOP- E/2 PIN 1 INDICATOR 3 ccc N/2 TIPS aaa C SEATING PLANE C SIDE VIEW NOTES: 1. CONTROLLING DIMENSIONS ARE IN MILLIMETERS (ANGLES IN DEGREES). 2. DATUMS ...
Page 23
POWER MANAGEMENT Outline Drawing - SO-16 2X E/2 ccc C 2X N/2 TIPS aaa C SEATING PLANE C SIDE VIEW NOTES: 1. CONTROLLING DIMENSIONS ARE IN MILLIMETERS (ANGLES IN DEGREES). 2. DATUMS -A- 3. DIMENSIONS "E1" AND "D" DO NOT ...