Mitchell Newer microprocessors personal computers have voltage ch

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Mitchell Newer microprocessors personal computers have voltage ch

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3.3V Regulator with Fail-Safe Switchover Design Note
Mitchell
Newer microprocessors personal computers have voltage chips which designed replace existing units. past processor swap simply matter removing replacing with updated version. upgrade path involves switching from chip that requires 3.xxV. means changing supply voltage from 3.xxV clip jumper that bypasses local 3.xxV regulator. This good solution since leaves much chance. Failure remove jumper result instant destruction microprocessor upon application power. means automatically sensing presence 3.xxV processor necessary. Intel microprocessors include special called "VOLDET" which used determine whether particular chip needs 3.xxV Figure shows simple circuit that takes advantage this automatically "jumper out" 3.xxV regulator whenever
100k 2N2222 MTB30N06EL VOLDET 3.45V) MICROPROCESSOR 3.45V,
3.45V,
processor inserted into socket. VOLDET pulled 3.xx processors; buffered transistor which grounds gate bypassing switch (Q1). turned leaving LT1085 regulate microprocessor's line. microprocessors VOLDET high; turned allowing Q1's gate pull 12V, turning itself With LT1085 shorted from input output MOSFET, flows directly microprocessor. service intervention required ensure correct potential. circuit Figure fine cases where available enhance MOSFET switch. However, portable applications,12V frequently available available only intermittent basis. Figure shows second solution using high-side gate driver control MOSFET. VOLDET pull-up resistor required both figures because some cases VOLDET
3.3M MTB30N06EL LTC1157 100k
100k
VOLDET 3.45V) MICROPROCESSOR
10µF
LT1085
22µF
DN82
10µF
LT1085
22µF
DN82
BEST PERFORMANCE, PLACE EACH 47µF, EACH 0.1µF EACH 0.01µF BYPASS CAPACITORS PINS INTEL 486MICROPROCESSOR. 47µF 0.1. INTEL TRADEMARK INTEL CORPORATION
Figure Bypass Circuit 3.xxV Microprocessor Swaps Using Transistor Buffer
Figure Bypass Circuit 3.xxV Microprocessor Swaps Using High-Side Gate Driver Supply Required)
05/94/82
open circuit shorting link, other cases open-drain output. VOLDET pulled both circuits. This could pose problem 3.xxV processors with open-drain VOLDET pins, 3.xxV devices VOLDET always pulled never reaches reaches VOLDET only devices. certain families microprocessors, 3.3V required. circuits shown Figures fully compatible with 3.3V applications simply substituting fixed 3.3V version regulator (use LT10853.3). Higher current operation also possible. LT1085 suitable applications; LT1084 MTB50N06EL Table shows wide range linear regulators available currents 10A. some applications complexity high efficiency switching regulator justified reasons battery life. Figure shows switcher that only converts 3.45V also acts bypass switch applications where output required. open drain collector pulling causes
side P-channel MOSFET turn 100%, effectively shorting output input. open collector turned off, LTC1148 operates high efficiency buck mode power converter, delivering regulated 3.45V load. 3.3V applications fixed 3.3V version LTC1148 available.
Table Linear Regulators 3.3V Conversion
LOAD CURRENT 150mA 700mA 800mA 1.5A 7.5A DEVICE LT1121-3.3 LT1129-3.3 LT1117-3.3 LT1086 LT1083 LT1084 LT1085 LT1087 FEATURES Shutdown, Small Capacitors Shutdown, Small Capacitors SOT-223 Package High Current, Quiescent Current High Loads Parallel, Kelvin Sensed
topic powering voltage microprocessors environment covered extensively Application Note available request. Both linear switching solutions discussed.
INPUT
Si9430
MBRS140T3
100µF
Si9410 0.01µF 0.033 220µF 6.3V SHUTDOWN 10µH
P-DRIVE SENSE
N-DRIVE
200pF 3300pF
Figure
literature Linear Regulators, call 1-800-4-LINEAR. applications help, call (408) 432-1900, Ext.
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, 95035-7487
(408) 432-1900 FAX: (408) 434-0507 TELEX: 499-3977
0.1µF
LTC1148 P-GND S-GND SHDN SENSE
SANYO (OS-CON) 20SA100M, 0.037, IRMS 2.25A SANYO (OS-CON) 10SA220M, 0.035, IRMS 2.36A SILICONIX PMOS BVDSS 20V, DCRON 0.100, 50nC SILICONIX NMOS BVDSS 30V, DCRON 0.050, 30nC MOTOROLA SCHOTTKY NP-2A-C1-0R020J, COILTRONICS CTX10-4
35.7k
2N2222 3.45V
DN82
3.45V
LT/GP 0594 190K PRINTED
LINEAR TECHNOLOGY CORPORATION 1994

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