ULDO LINEAR REGULATOR 1.5V 2.5V FIXED OUTPUT VOLTAGE 6.5V INPUT V

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ULDO LINEAR REGULATOR 1.5V 2.5V FIXED OUTPUT VOLTAGE 6.5V INPUT V

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L4957
ULDO LINEAR REGULATOR
1.5V 2.5V FIXED OUTPUT VOLTAGE 6.5V INPUT VOLTAGE RANGE 200m Rdson TYPICAL 125°C 0.6V max. DROP-OUT EXCELLENT LOAD REGULATION 0.6mA QUIESCENT CURRENT LOAD SHORT CIRCUIT PROTECTION WITH FOLDBACK THERMAL SHUTDOWN APPLICATIONS MOTHER BOARDS PROCESSOR SUPPLIES VOLTAGE MEMORY CHIP SUPPLIES GRAPHIC SOUND CARDS VOLTAGE LOGIC SUPPLIES POST REGULATOR SMPS DESCRIPTION L4957 devices Ultra Drop Output linear regulators with internal N-channel 200m particulary suitable voltage/low dropout applications. Operating with input voltage from 6.5V they capable deliver 1.5V 2.5V fixed output voltages.
MULTIPOWER TECHNOLOGY
Versawatt TO-220
D2PAK
ORDERING NUMBERS: L4957V1.5 L4957V2.5 L4957D1.5 L4957D2.5
devices ideal supplies required processor, example they cost effective efficient solution conversion from 3.3V (rail bus) 2.5V 2.5A 1.5V with high current rating. Fast response transient minimise output capacitor value. minimum 22µF assures stability load conditions. on-chip trimming technique offers tighter voltage reference tolerance (with including line load variation) beside ensure controlled short circuit current. Thermal shutdown provides protection against overload conditions that creates excessive junction temperature.
TYPICAL APPLICATION
6.5V
VOUT=1.5V/2.5V
L4957
D97IN657E
February 2000
L4957
ABSOLUTE MAXIMUM RATINGS
Symbol Tstg Supply Input Voltage Junction Temperature Storage Temperature Parameter Value +150 +150 Unit
PINS CONNECTION
D98IN838B
D98IN933A
Versawatt (TO220)
D2PAK
BLOCK DIAGRAM
10µF
CURRENT LIMIT WITH FOLDBACK CHARGE PUMP
VREF
REGULATOR
BUFFER
POWER DMOS 150m VOUT 22µF
THERMAL SHUTDOWN
D98IN839C
L4957
FUNCTIONS
Name Function Unregulated input voltage; this must bypassed with capacitor larger than 10µF. connect Ground 1.5V 2.5V output. Regulated output voltage. minimum bypass capacitor 22µF required insure stability.
THERMAL DATA
Symbol j-case j-amb Parameter Thermal Resistance Junction-case Thermal Resistance Junction-ambient Thermal Shutdown Thermal Hysteresis Max. Max. Typ. Typ. TO220 D2PAK Unit °C/W °C/W
L4957 ELECTRICAL CHARACTERISTICS 25°C, unless otherwise specified). Specifications referred from +125°C.
Symbol Parameter Operating Supply Voltage Output Voltage L4957V1.5/D1.5 0.1A 6.5V 6.5V; 0.1A L4957V2.5/D2.5 0.1A 6.5V 6.5V; 0.1A DSON Load regulation Drain-Source Resistance Current Limiting Short Circuit Current Quiescent Current Ripple Rejection
connected ground.
Test Condition
Min.
Typ.
Max.
Unit
1.47 1.455 2.45 2.425
1.53 1.545 2.55 2.575
0.1A
0.1A 6.5V 120Hz, 2VPP
Figure Line Regulation Junction Temperature
Output Voltage Deviation [mV] [°C]
6.5V Iout 10mA
Figure Load Regulation
Output Voltage Deviation [mV] Iout (Pulsed technique been used) Vout 1.5V
L4957
Figure Maximum Output Current Junction Temperature
utput urrent [°C] (Vin-Vout)
ratin
Figure Operating Area
ation
ulsed tecnique been used
Figure Ripple Rejection Frequency
100k
Figure Output Voltage Output Current. (VOUT 1.5V)
VOUT
D98IN846A
VOUT
IOUT(A)
Figure Maximum Output Current Drop-Out Voltage
L4957
MIN. 3.75 13.0 2.65 15.25 6.20 3.50 3.85 0.147 4.40 1.23 2.40 0.49 0.61 1.14 1.14 4.95 2.40 10.0 16.4 14.0 2.95 15.75 6.60 3.93 0.511 0.104 0.600 0.244 0.137 0.102 0.151 TYP. MAX. 4.60 1.32 2.72 0.70 0.88 1.70 1.70 5.15 2.70 10.4 MIN. 0.173 0.048 0.094 0.019 0.024 0.044 0.044 0.194 0.094 0.393 0.645 0.551 0.116 0.620 0.260 0.154 inch TYP. MAX. 0.181 0.051 0.107 0.027 0.034 0.067 0.067 0.203 0.106 0.409
DIM.
OUTLINE MECHANICAL DATA
Versawatt (TO220)
TO220MEC
L4957
DIMENSIONS REF. Millimeters Min. 4.30 2.49 0.03 0.70 1.25 0.45 1.21 8.95 10.00 4.88 15.00 1.27 1.40 0.40 1.40 Typ. Max. Min. 4.60 0.169 2.69 0.098 0.23 0.001 0.93 0.027 0.049 0.055 0.60 0.017 1.36 0.047 9.35 0.352 10.28 0.393 5.28 0.192 15.85 0.590 1.40 0.050 1.75 0.055 0.016 0.024 0.054 0.368 0.405 0.208 0.624 0.055 0.069 Inches Typ. Max. 0.181 0.106 0.009 0.037
OUTLINE MECHANICAL DATA
D2PAK
16.90
MIN. FLAT ZONE
3.70 8.90 10.30 1.30 5.08
L4957
Information furnished believed accurate reliable. However, STMicroelectronics assumes responsibility consequences such information infringement patents other rights third parties which result from use. license granted implication otherwise under patent patent rights STMicroelectronics. Specification mentioned this publication subject change without notice. This publication supersedes replaces information previously supplied. STMicroelectronics products authorized critical components life support devices systems without express written approval STMicroelectronics. logo registered trademark STMicroelectronics 2000 STMicroelectronics Printed Italy Rights Reserved STMicroelectronics GROUP COMPANIES Australia Brazil China Finland France Germany Hong Kong India Italy Japan Malaysia Malta Morocco Singapore Spain Sweden Switzerland United Kingdom U.S.A. http://www.st.com

ULDO LINEAR REGULATOR 1.5V 2.5V FIXED OUTPUT VOLTAGE 6.5V INPUT V

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