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Partno	Mfg	Dc	Qty	Available	Descript
L4957D1.5 \|L4957D15	ST	N/a	3500	avai	UP TO 4A ULDO LINEAR REGULATOR
L4957D-1.5 \|L4957D15	ST	N/a	3500	avai	UP TO 4A ULDO LINEAR REGULATOR
L4957D2.5 \|L4957D25	ST	N/a	12000	avai	UP TO 4A ULDO LINEAR REGULATOR
L4957D-2.5 \|L4957D25	ST	N/a	8000	avai	UP TO 4A ULDO LINEAR REGULATOR
L4957V-1.5 \|L4957V15	ST	N/a	2000	avai	UP TO 4A ULDO LINEAR REGULATOR
L4957V2.5 \|L4957V25	ST	N/a	5625	avai	UP TO 4A ULDO LINEAR REGULATOR

L4957D2.5 ,UP TO 4A ULDO LINEAR REGULATORapplications.line and load variation) beside to ensure a con-Operating with a input voltage from 3V ..
L4957D-2.5 ,UP TO 4A ULDO LINEAR REGULATORL4957 UP TO 4A ULDO LINEAR REGULATOR1.5V AND 2.5V FIXED OUTPUT VOLTAGEMULTIPOWER BCD TECHNOLOGY3V ..
L4957V-1.5 ,UP TO 4A ULDO LINEAR REGULATORAPPLICATIONSL4957V1.5 L4957D1.5MOTHER BOARDSL4957V2.5 L4957D2.5PROCESSOR I/O & SUPPLIESLOW VOLTAGE ..
L4957V2.5 ,UP TO 4A ULDO LINEAR REGULATORABSOLUTE MAXIMUM RATINGSSymbol Parameter Value UnitV Supply Input Voltage 7 VINT Junction Temperatu ..
L4959 ,MULTIFUNCTION VOLTAGE REGULATOR FOR HOME AUDIOELECTRICAL CHARACTERISTICS ° (VS = 18V, Tcase = 25 C, unless otherwise specified.)Symbol Parameter ..
L4959 ,MULTIFUNCTION VOLTAGE REGULATOR FOR HOME AUDIOABSOLUTE MAXIMUM RATINGSSymbol Parameter Value UnitV DC Supply Voltage 35 VSIO Output Current inter ..
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L4957D1.5-L4957D-1.5-L4957D2.5-L4957D-2.5-L4957V-1.5-L4957V2.5
UP TO 4A ULDO LINEAR REGULATOR
L4957 TO 4A ULDO LINEAR REGULATOR
1.5V AND 2.5V FIXED OUTPUT VOLTAGE TO 6.5V INPUT VOLTAGE RANGE
200mΩ Rdson TYPICAL @Tj= 125°C
0.6V max. DROP-OUT AT2A
EXCELLENTLOAD REGULATION
0.6mA QUIESCENT CURRENT AT ANY LOAD
SHORT CIRCUIT PROTECTION WITH FOLD-
BACK
THERMAL SHUTDOWN
APPLICATIONS
MOTHER BOARDS
PROCESSORI/O& SUPPLIES
LOW VOLTAGE MEMORY& CHIP SET SUP-
PLIES
GRAPHIC& SOUND CARDS
LOW VOLTAGE LOGIC SUPPLIES
POST REGULATOR FOR SMPS
DESCRIPTION
The L4957 devices are Ultra Low Drop Output lin-
ear regulators withan internal N-channel MOSof
200mΩ particulary suitable for low voltage/low
dropout applications.
Operating witha input voltage from 3Vto 6.5V
they are capableto deliver upto 4Aat 1.5Vor
2.5V fixed output voltages.
The devices are ideal for useas oneof the sup-
plies requiredby processor, for example they are
the cost effective and efficient solution for conver-
sion from 3.3V (rail bus)to 2.5V @ 2.5Aorto
1.5V with high current rating.
Fast response transient minimise the output ca-
pacitor value.A minimumof 22μF assures the
stabilityinall load conditions.
The on-chip trimming technique offersa tighter
voltage reference tolerance (with± 2% including
line and load variation) besideto ensurea con-
trolled short circuit current. Thermal shutdown
provides protection against overload conditions
that creates excessivejunction temperature.
February 2000
L4957
GND
OUTIN 3to 6.5V
VOUT=1.5V/2.5V
D97IN657E
TYPICAL APPLICATION
ORDERING NUMBERS:
L4957V1.5 L4957D1.5
L4957V2.5 L4957D2.5
MULTIPOWER BCD TECHNOLOGY2 PAKVersawatt TO-220
1/7
ABSOLUTE MAXIMUM RATINGS
Symbol Parameter Value Unit
VIN Supply InputVoltage 7 V Junction Temperature -40to +150 °C
Tstg Storage Temperature -40to +150 °C
PINS CONNECTION
PRE
REGULATOR
VREFE/A
OUT
GND
D98IN839C
VIN
10μF
CURRENT
LIMIT
WITH
FOLDBACK
THERMAL
SHUTDOWN
BUFFER
CHARGE
PUMP
POWER
DMOS
150mΩ
22μF
VOUT
BLOCK DIAGRAM
OUT
GND1
D98IN838B
Versawatt (TO220)
OUT
GND1
D98IN933A
D2PAK
L4957
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L4957- ELECTRICAL CHARACTERISTICS(Tj =25°C, VIN= 5V, unless otherwise specified).•= SpecificationsreferredtoTJ from 0°Cto +125°C.
Symbol Parameter Test Condition Min. Typ. Max. Unit
VIN Operating Supply Voltage
(1) 6.5 V Output Voltage (1) ForL4957V1.5/D1.5
0.1AForL4957V2.5/D2.5
0.1AΔVO Load regulation (1) 0.1ARDSON Drain-Source ON
Resistance • 200 300 mΩ Current Limiting 90%VO • 5.1 6.3 7.5 A
Short Circuit Current VO =0V • 1.8 A Quiescent Current 0.1ARipple Rejection f= 120Hz,IO =4A
VIN =5V ΔVIN =2VPP 75 dB
(1)GND connectedto ground.
THERMAL DATA
Symbol Parameter TO220 D2PAK Unit
Rth j-case Thermal Resistance Junction-case Max. 2.5 3 °C/W
Rthj-amb Thermal Resistance Junction-ambient Max. 50 60 °C/W
Thermal Shutdown Typ. 150 °C
Thermal Hysteresis Typ. 20 °C
PIN FUNCTIONS
PinN° Name Function IN Unregulated input voltage; thispin mustbe bypassed witha capacitor larger than 10μF. GND To connectto Groundto get 1.5Vor 2.5V output. OUT Regulated output voltage.A minimum bypass capacitorof 22μFis requiredto insure stability.
-40 -20 0 20 40 60 80 100 120 140 160
4.5 [°C]
Output
Voltage
Deviation
[mV]Iout= 10mA
Figure1: Line Regulationvs. Junction
Temperature
01234 5-5
Iout[A]
Output
Voltage
Deviation
[mV]
Vin=5V =25°C
(Pulsed techniquehas been used)
Vout= 1.5V
Figure2: Load Regulation
L4957
3/7
*Pulsed tecniquehas been used
-40 -20 0 20 40 60 80 100 120 140 1600 [°C]
Output Current [A]
(Vin-Vout)>2V
pin2= GND
Figure3: Maximum OutputCurrentvs. Junction
Temperature
Vin>2.8V
Tj=125C Tc=25°C
Pdmax=40W
Rdson
limit Operating Areaower DissipationLimit
Current Limitation
Tc=70°C
Pdmax=22W
012 3 456 78
(Vin- Vout) [V] utput Current [A]
Figure4: DCOperating Area
100 requency[Hz]ippleR ejection [dB]10 100 10k 100k ripple=3Vp-p Vripple=0.5Vp-p
Cin=22uF
Cout=22uF
Vout=1.5V
Vinm in=3V
Iout=5A
Figure5: Ripple Rejection vs. Frequency
1.8 6.3 IOUT(A)
VOUT
(V)
D98IN846A
80% VOUT
Figure6: Output Voltage vs. Output Current.
(VOUT= 1.5V) 0.2 0.4 0.6 0.81 1.2 1.4 1.61.820
ΔV=Vin-Vo [A]
maximum Ron limits=1 00°C= 125°C= 25°C
Figure7: MaximumOutput Current vs. Drop-Out
Voltage
L4957
4/7
Versawatt (TO220)
DIM. mm inch
MIN. TYP. MAX. MIN. TYP. MAX. 4.40 4.60 0.173 0.181 1.23 1.32 0.048 0.051 2.40 2.72 0.094 0.107 0.49 0.70 0.019 0.027 0.61 0.88 0.024 0.034 1.14 1.70 0.044 0.067 1.14 1.70 0.044 0.067 4.95 5.15 0.194 0.203 2.40 2.70 0.094 0.106 10.0 10.4 0.393 0.409 16.4 0.645 13.0 14.0 0.511 0.551 2.65 2.95 0.104 0.116 15.25 15.75 0.600 0.620 6.20 6.60 0.244 0.260 3.50 3.93 0.137 0.154 2.6 0.102
Dia 3.75 3.85 0.147 0.151
TO220MEC
OUTLINE AND
MECHANICAL DATA
L4957
5/7
2 PAKOUTLINE AND
MECHANICAL DATA
2.0 MIN.
FLAT ZONE
8.90 3.70
REF.
DIMENSIONS
Millimeters Inches
Min. Typ. Max. Min. Typ. Max. 4.30 4.60 0.169 0.181 2.49 2.69 0.098 0.106 0.03 0.23 0.001 0.009 0.70 0.93 0.027 0.037 1.25 1.40 0.049 0.055 0.45 0.60 0.017 0.024 1.21 1.36 0.047 0.054 8.95 9.35 0.352 0.368 10.00 10.28 0.393 0.405 4.88 5.28 0.192 0.208 15.00 15.85 0.590 0.624 1.27 1.40 0.050 0.055 1.40 1.75 0.055 0.069 0.40 0.016 0° 8° 0° 8°
L4957
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