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PDF L4955 Data sheet ( Hoja de datos )
| Número de pieza | L4955 | |
| Descripción | 5A ULDO LINEAR REGULATORS FAMILY | |
| Fabricantes | STMicroelectronics | |
| Logotipo |  |
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® L4955
5A ULDO LINEAR REGULATORS FAMILY
UP TO 5A OUTPUT CURRENT
±2% PRECISE OUTPUT VOLTAGES
FAST TRANSIENT RESPONSE
0.75V TYP. DROP OUT VOLTAGE AT 5A
OPERATING INPUT VOLTAGE FROM 4.5V
ADJUSTABLE VERSION:
• VO = 1.26V
• INHIBIT (IQ = 120µA TYP.)
• POWER GOOD
• PROGRAMMABLE CURRENT LIMIT
• HEPTAWATT PACKAGE
FIXED VERSION:
• 3.3V, 5.1V OUTPUTS
• VERSAWATT PACKAGE
VERY LOW QUIESCENT CURRENT
SHORT CIRCUIT PROTECTION (Foldback
function)
THERMAL SHUTDOWN
APPLICATIONS
PENTIUM™ AND POWER PC™ SUPPLIES
POST REGULATOR FOR SMPS
LOW COST SOLUTION FOR 5V TO 3.3V
CONVERSION
LOW COST BATTERY CHARGER
CONSTANT CURRENT REGULATOR
SUITABLE FOR APPLICATION WITH
STANDBY FEATURE
DESCRIPTION
The L4955 is a family of monolithic ultra very low
drop linear regulators designed to supply the
most recent microprocessors.
TYPICAL APPLICATIONS
MULTIPOWER BCD TECHNOLOGY
HEPTAWATT
ORDERING
NUMBERS
L4955
L4955V3.3
L4955V5.1
OUTPUT
VOLTAGE
1.26V ADJ
3.3V
5.1V
VERSAWATT
(TO-220)
PACKAGE
HEPTAWATT
VERSAWATT
VERSAWATT
The dropout voltage is only 0.75V (Typ.) at 5A, di-
rectly dependent on the output current conditions.
Realized in BCDII technology, it has on board a
charge pump to properly drive an N-channel
power mos Transistor with 150mΩ of RDSON.
It operates from a 4.5V minimum supply, with a
very low quiescent current irrespective of the
load; a minimum of 22µF output capacitor is re-
quired for stability.
The on-chip trimming techniques improve the pre-
cision of the available output voltages to ±2%.
Ancillary functions like power good, inhibit with
low power consumption, programmable output
voltage and current limiting make the flexible
heptawatt version usable in applications where
power management, stand-by, features, post
regulation and adjustable current generators for
battery chargers are important.
VIN
C1
INH PG
IN 3
1
6 OUT
7
L4955
24
ADJ
5
CL GND
VOUT
R1
C2
R2
D97IN589
VIN
C1
IN OUT
13
L4955VXXX
VOUT
2
GND
D97IN590
C2
February 1999
1/14
1 page  
L4955
L4955
Figure 1: L4955 DC Operating Area
Figure 2: Output Voltage Stability vs. Junction
Temperature
O u tput C ur rent [A ]
8
7
C urr ent Lim itation
6
Vin > 4.5V
Tj = 125°C
Vo u t [V ]
1 .28
1 .27 5
1 .27
V in = 1 2 V
Io u t= 1 0 m A
5
Rdson
4 lim it
3
Pow er D is sipation Lim it
Tc = 25°C
Pdmax = 40W
2 D C O perating Area
1 Tc = 70°C
0 Pdm ax = 22W
0 2.5 5 7.5 10 12.5 15 17.5 20 22.5
(V in - Vou t) [V ]
Figure 3: Line Regulation vs. Junction
Temperature
5
4.5
4
3.5 4.5V <Vin<2 2V
Iout=10m A
3
2.5
2
1.5
1
0.5
0
-40 -20 0 20 40 60 80 100 120 140 160
T j [°C]
Figure 5: Dropout Voltage
1 .25
1
0 .75
0 .5
T j = 125 °C
T j = 25 °C
T j = -40 °C
0 .25
P u ls e d te c h n iq ue h a s b e e n u s e d
0
0123456
Iout [A]
1 .26 5
1 .26
1 .25 5
1 .25
1 .24 5
1 .24
-40
0
40 80
T j [°C ]
Figure 4: Load Regulation
120
160
5
4 V in = 12 V
T j = 25 °C
3 (P uls ed techn iqu e h as b ee n used )
2
Vo ut = VAD J
1
0
-1
-2
-3
-4
-5
012345
Io ut [A ]
Figure 6: Maximum OutputCurrent vs. Junction
Temperaturewith internalcurrent limiting
O utput Current [A]
10
9
8
7
6
5
4
(Vin-Vout) > 2V
3
pin 2 = GND
2
1
0
-40 -20 0 20 40 60 80 100 120 140 160
Tj [°C]
*Pulsed tecnique has been used
5/14
5 Page 
L4955
L4955V5.1
Figure 29: DC operating area.
O ut put C u rr e nt [A ]
8
7
C u rre nt L im itatio n
6
Rd son
5 lim it
Vout = 5.1V
Tj = 125°C
Pow er D issip a tio n Lim it
Figure 30: Output Voltage Stability vs. Junction
Temperature.
Vout [V]
5.2
5.15
V in = 8V
Iout = 10mA
5.1
4
3
DC O pe ratin g A re a
2
Tc = 25°C
Pdmax = 40W
5.05
5
4.95
1 Tc = 70°C
Pdm ax = 22W
0 4.9
0 2 .5 5 7 .5 10 1 2 .5 15 1 7 .5
-40 0 40 80 120 160
(V in - Vou t) [V ]
T j [°C ]
Figure 31: Quiescent Current vs. Temperature.
Figure 32: Load Regulation
Iq [mA]
3
2 .75
2 .5
2 .25
2
1 .75
1 .5
1 .25
1
0 .75
0 .5
0 .25
Vin = 8V
Iout = 10mA to 5A
0
-40 -20 0 20 40 60 80
T j [°C]
100 120 140 160
Figure 33: Line regulation vs. Junction Tempera-
ture.
5
4.5
4 6.5V < Vin < 15V
3.5 Iout = 10mA
3
2.5
2
1.5
1
0.5
0
-40 -20 0 20 40 60 80 100 120 140 160
Tj [°C]
10
8
6
4
2
0
-2
-4
Vin = 8V
-6 Tj = 25 °C
(P uls e d tec n iq u e h as be en us ed )
-8
-10
01234 5
Io u t [A]
Figure 34: Maximum OutputCurrent vs. Junction
Temperaturewith internalcurrent limiting
O utput Current [A]
10
9
8
7
6
5
4
(Vin-Vout) > 2V
3
pin 2 = GND
2
1
0
-40 -20 0 20 40 60 80 100 120 140 160
Tj [°C]
*Pulsed tecnique has been used
11/14
11 Page | ||
| Páginas | Total 14 Páginas | |
| PDF Descargar | [ Datasheet L4955.PDF ] | |
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