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PDF L4956 Data sheet ( Hoja de datos )
| Número de pieza | L4956 | |
| Descripción | 5A LOW DROP LINEAR REGULATOR | |
| Fabricantes | STMicroelectronics | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de L4956 (archivo pdf) en la parte inferior de esta página. Total 8 Páginas | ||
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L4956
5A LOW DROP LINEAR REGULATOR
SPLITTED SUPPLY VOLTAGE FOR IM-
PROVED EFFICIENCY:
- VPW: 3V MIN. POWER SUPPLY VOLTAGE
- VSIG: 4.5V MIN. SIGNAL SUPPLY VOLTAGE
5A OUTPUT CURRENT
FAST LOAD TRANSIENT RESPONSE
0.75V TYP. DROP OUT VOLTAGE AT 5A
INHIBIT WITH ZEROCURRENT COMSUMPTION
POWER GOOD
SHORT CIRCUIT PROTECTION
THERMAL SHUTDOWN
HEPTAWATT PACKAGE
APPLICATIONS
PENTIUM™ AND POWER PC™ SUPPLIES
LOW COST SOLUTION FOR 3.3V TO 1.5V
CONVERSION
SUITABLE FOR APPLICATIONS WITH
STAND BY FEATURE
DESCRIPTION
The L4956 is an adjustable monolithic linear regu-
lator designed to satisfy very heavy load transient
and efficient power conversion from 3.3V to 1.26V
and lower, up to 5A.
MULTIPOWER BCD TECHNOLOGY
HEPTAWATT
ORDERING NUMBER: L4956
Designed in BCDII technology, it uses a charge
pump technique to have a proper internal N-chan-
nel gate drive. The signal supply voltage input
VSIG can operate from 4.5V up to an absolute of
7V and the power supply voltage input VPW can
opearte from 3V min to an absolute of 7V. An
RDSON of 150mV gives a voltage drop of 750mV
at 5A of load current.
Very fast load transients and ±1% of reference
voltage precision makes this device suitable for
supplying last micrprocessors generation and low
voltage logics.
The Heptawatt package enriches the device with
auxiliary functions like power good and inhibit.
TYPICAL APPLICATION
VPW=3.3Vbus
VPW 1
VSIG=
5Vbus
VSIG
2
C1 C3
INH PG
36
L4956
4
GND
OUT
7
ADJ
5
VO
R1
C2
R2
D96IN374B
March 1998
1/8
1 page  
Figure 7. Quiescent Current at pin VSIG vs.
Signal Input Voltage.
Iq [m A]
3
2 .5
2
Io = 1 0m A to 5 A
T j = 25°C
3 V < V PW < 6 .5 V
1 .5
1
0 .5
0
01234567
V S IG [V ]
Figure 9. Power Good Function
L4956
Figure 8. Stand-By Current at pin VSIG vs. Signal
Input Voltage with INH = LOGIC HIGH
Iq [µ A ]
1 50
1 25
1 00
75
T j = 25 °C
5 0 3 V < V P W < 6 .5 V
25
0
4 4 .5 5 5 .5 6 6 .5 7
V S IG [V ]
VADJ
VOUT=VADJ (R1+R2)/R2
0.9 VADJ
PG
hyst = 200mV
t
Low
High
Low
D96IN364B
t
Figure 10. Inhibit Function
VINH
Vref = 1.26V
hyst = 200mV
t
regulator
ON
regulator
OFF
regulator
ON
D96IN365A
t
5/8
5 Page | ||
| Páginas | Total 8 Páginas | |
| PDF Descargar | [ Datasheet L4956.PDF ] | |
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