DROP LINEAR REGULATOR SPLITTED SUPPLY VOLTAGE IMPROVED EFFICIENCY

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DROP LINEAR REGULATOR SPLITTED SUPPLY VOLTAGE IMPROVED EFFICIENCY

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L4956
DROP LINEAR REGULATOR
SPLITTED SUPPLY VOLTAGE IMPROVED EFFICIENCY: VPW: MIN. POWER SUPPLY VOLTAGE VSIG: 4.5V MIN. SIGNAL SUPPLY VOLTAGE OUTPUT CURRENT FAST LOAD TRANSIENT RESPONSE 0.75V TYP. DROP VOLTAGE INHIBIT WITH ZERO CURRENT COMSUMPTION POWER GOOD SHORT CIRCUIT PROTECTION THERMAL SHUTDOWN HEPTAWATT PACKAGE APPLICATIONS PENTIUMAND POWER PCSUPPLIES COST SOLUTION 3.3V 1.5V CONVERSION SUITABLE APPLICATIONS WITH STAND FEATURE DESCRIPTION L4956 adjustable monolithic linear regulator designed satisfy very heavy load transient efficient power conversion from 3.3V 1.26V lower, TYPICAL APPLICATION MULTIPOWER TECHNOLOGY
HEPTAWATT ORDERING NUMBER: L4956
Designed BCDII technology, uses charge pump technique have proper internal N-channel gate drive. signal supply voltage input VSIG operate from 4.5V absolute power supply voltage input opearte from absolute RDSON 150mV gives voltage drop 750mV load current. Very fast load transients reference voltage precision makes this device suitable supplying last micrprocessors generation voltage logics. Heptawatt package enriches device with auxiliary functions like power good inhibit.
VPW=3.3Vbus VSIG
D96IN374B
VSIG= 5Vbus
L4956
March 1998
L4956
ABSOLUTE MAXIMUM RATINGS
Symbol VPW, VSIG Parameter Supply Input Voltage pins Power Dissipation Tamb 50°C Power Dissipation Tcase 90°C Storage Temperature Value -0.3 VSIG +150 Unit
PTOT Tst,
CONNECTION (Top view)
connected
D96IN373
VSIG
FUNCTIONS
Name VSIG Function Unregulated power input voltage; this must bypassed with capacitor larger than 10µF. Unregulated signal input voltage this passed with minimum capacitor 0.1µF. TTL-CMOS input. logic level this input disable device. internal pull-down insures insures full functionally even open. Ground. output connected directly this terminal 1.26V operation divider higher voltages. Open drain output, this when output voltage lower than 90%, otherwise high. Regulated output voltage. minimum bypass capacitor 22µF required insure stability.
BLOCK DIAGRAM
10µF VSIG VSIG VREF= 1.26V CURRENT LIMITATION CHARGE PUMP
FOLDBACK
REGULATOR
BUFFER
POWER DMOS 150m VOUT 22µF
THERMAL SHUTDOWN
1.26V INHIBIT ACTIVE HIGH 0.9VREF
D96IN372A
L4956
THERMAL DATA
Symbol j-pins j-amb Parameter Thermal Resistance Junction-case Thermal Resistance Junction-ambient Thermal Shutdown Thermal Hysteresis Typ. Typ. Value Unit °C/W °C/W
ELECTRICAL CHARACTERISTICS 25°C, unless otherwise specified)
Symbol VSIG VOUT Parameter Power Operating Supply Voltage Test Condition Min. 1.240 1.224 Typ. Max. 1.280 1.296 1.42 Unit
VOUT VOUT
Signal Operating Supply Voltage Output Voltage 125°C; 3.3V 4.5V VSIG 6.5V; 0.1A 5.5V; 4.5V VSIG 6.5V 0.1A 125°C Line regulation 5.5V; 10mA 4.5V VSIG 6.5V Load regulation 3.3V; VSIG 0.1A Drop-out Voltage 125°C Current Limiting Short Circuit Current Quiescent Current VSIG Stand Current VSIG Inhibit Threshold Inhibit Histeresys Inhibit Bias Sink Current Power Good Threshold Power Good Saturation Power Good Histeresys 125°C 125°C 0.1A 4.5V VSIG <6.5V HIGH VSIG 125°C
1.260 1.260 0.75
1.26 VOUT
Output voltage connected ADJ.
L4956
Figure Operating Area.
rren itation
Figure Output Voltage Stability Junction Temperature
Power
Figure Load Regulation.
Figure Dropout Voltage.
Pulsed technique been used
Figure Maximum Output Current Junction Temperature
Figure Quiescent Current VSIG Junction Temperature.
L4956
Figure Quiescent Current VSIG Signal Input Voltage.
Figure Stand-By Current VSIG Signal Input Voltage with LOGIC HIGH
Figure Power Good Function
VADJ VOUT=VADJ (R1+R2)/R2
VADJ hyst 200mV
High
D96IN364B
Figure Inhibit Function
VINH
Vref 1.26V hyst 200mV
regulator
regulator
regulator
D96IN365A
L4956
LOAD TRANSIENT RESPONSE Figure Figure
Vout 50mV/div CH1gnd Vout 50mV/div CH1gnd
0.5A CH2gnd Iout 2A/div 5µs/div
0.5A CH2gnd Iout 2A/div 5µs/div
Figure
Test conditions: 3.3V; VSIG Vout 1.5V; Load Transient from 0.5A dlout 20A/µs; 25°C
Vout 50mV/div CH1gnd
0.5A CH2gnd Iout 2A/div 100µs/div
Figure Load transient test circuit.
VIN=3.3V VSIG=5V VSIG C1,C2 470µF Panasonic 100µF/10V each each VOUT=1.5V
L4956
220nF
D97IN593
L4956
HEPTAWATT PACKAGE MECHANICAL DATA
DIM. 3.65 15.1 5.08 3.85 0.144 10.05 16.97 14.92 21.54 22.62 15.8 0.102 0.594 0.236 0.110 0.200 0.152 2.41 4.91 7.49 2.54 5.08 7.62 0.35 MIN. TYP. MAX. 1.37 1.35 0.55 2.67 5.21 10.4 10.4 0.396 0.668 0.587 0.848 0.891 0.118 0.622 0.260 0.095 0.193 0.295 0.100 0.200 0.300 0.094 0.047 0.014 0.024 MIN. inch TYP. MAX. 0.189 0.054 0.110 0.053 0.022 0.031 0.035 0.105 0.205 0.307 0.409 0.409
L4956
Information furnished believed accurate reliable. However, SGS-THOMSON Microelectronics assumes responsibility consequences such information infringement patents other rights third parties which result from use. license granted implication otherwise under patent patent rights SGS-THOMSON Microelectronics. Specification mentioned this publication subject change without notice. This publication supersedes replaces information previously supplied. SGSTHOMSON Microelectronics products authorized critical components life support devices systems without express written approval SGS-THOMSON Microelectronics. 1998 SGS-THOMSON Microelectronics Printed Italy Rights Reserved SGS-THOMSON Microelectronics GROUP COMPANIES Australia Brazil Canada China France Germany Italy Japan Korea Malaysia Malta Morocco Netherlands Singapore Spain Sweden Switzerland Taiwan Thailand United Kingdom U.S.A.

DROP LINEAR REGULATOR SPLITTED SUPPLY VOLTAGE IMPROVED EFFICIENCY

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