ULDO LINEAR REGULATOR 1.5V, 1.8V, 2.5V 3.3V FIXED OUTPUT VOLTAGE

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ULDO LINEAR REGULATOR 1.5V, 1.8V, 2.5V 3.3V FIXED OUTPUT VOLTAGE

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L4957A
ULDO LINEAR REGULATOR
1.5V, 1.8V, 2.5V 3.3V FIXED OUTPUT VOLTAGE INPUT VOLTAGE RANGE 200m Rdson TYPICAL 125°C 0.6V max. DROP-OUT EXCELLENT LOAD REGULATION 0.6mA QUIESCENT CURRENT LOAD SHORT CIRCUIT PROTECTION THERMAL SHUTDOWN APPLICATIONS MOTHER BOARDS PROCESSOR SUPPLIES VOLTAGE MEMORY CHIP SUPPLIES GRAPHIC SOUND CARDS VOLTAGE LOGIC SUPPLIES POST REGULATOR SMPS DESCRIPTION L4957A devices Ultra Drop Output linear regulators with internal N-channel 200m particulary suitable voltage/low dropout applications. Operating with input voltage from they capable deliver devices ideal sup-
MULTIPOWER TECHNOLOGY
Versawatt TO-220
D2PAK
ORDERING NUMBERS: L4957AV1.5 L4957AV1.8 L4957AV2.5 L4957AV3.3 L4957AD1.5 L4957AD1.8 L4957AD2.5 L4957AD3.3
plies 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
VOUT
L4957A
D00IN1107A
January 2002
L4957A
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
CHARGE PUMP
VREF
CURRENT LIMIT
REGULATOR
BUFFER
POWER DMOS 200m VOUT 22µF
THERMAL SHUTDOWN
D00IN1108A
FUNCTIONS
Name Function Unregulated input voltage; this must bypassed with capacitor larger than 10µF. connect Ground 1.5V, 1.8V, 2.5V 3.3V output. Regulated output voltage. minimum bypass capacitor 22µF required insure stability.
L4957A
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
ELECTRICAL CHARACTERISTICS 25°C, unless otherwise specified). Specifications referred from +125°C.
Symbol Parameter Operating Supply Voltage Output Voltage 3.15V 5.25V; 0.1A 3.3V ±5%; 0.1A 3.3V 0.1A Test Condition Min. 1.485 1.47 1.782 Typ. Max. 1.515 1.53 1.818 1.836 2.525 2.55 3.333 3.366 Unit
3.3V (0.1A 4.5A) 0.1A 3.3V 0.1A
1.764 2.475 2.45 3.267 3.234
3.3V (0.1A 2.2A) 0.1A DSON Drain-Source Resistance Current Limiting Quiescent Current Ripple Rejection 120Hz, 2VPP 0.1A 0.1A
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
L4957A
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
D00IN1109
IOUT(A)
Figure Maximum Output Current Drop-Out Voltage
L4957A
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
L4957A
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
L4957A
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 2002 STMicroelectronics Printed Italy Rights Reserved STMicroelectronics GROUP COMPANIES Australia Brazil Canada China Finland France Germany Hong Kong India Israel Italy Japan Malaysia Malta Morocco Singapore Spain Sweden Switzerland United Kingdom United States. http://www.st.com

ULDO LINEAR REGULATOR 1.5V, 1.8V, 2.5V 3.3V FIXED OUTPUT VOLTAGE

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