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PDF CS5257A-1GDP5 Data sheet ( Hoja de datos )
| Número de pieza | CS5257A-1GDP5 | |
| Descripción | 7A LDO 5-Pin Adjustable Linear Regulator | |
| Fabricantes | Cherry Semiconductor Corporation | |
| Logotipo |  |
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CS5257A-1
7A LDO 5-Pin Adjustable Linear Regulator
Description
This new very low dropout regula-
tor is designed to power the next
generation of advanced micropro-
cessors. To achieve very low
dropout, the internal pass transistor
is powered separately from the con-
trol circuitry. Furthermore, with the
control and power inputs tied
together, this device can be used in
single supply configuration and
still offer a better dropout voltage
than conventional PNP-NPN based
LDO regulators. In this mode the
dropout is determined by the mini-
mum control voltage.
It is supplied in five-terminal
TO-220 and D2PAK packages,
allowing for the implementation of
a remote-sense pin permitting very
accurate regulation of output volt-
age directly at the load, where it
counts, rather than at the regulator.
This remote sensing feature virtual-
ly eliminates output voltage varia-
tions due to load changes and resis-
tive voltage drops. Typical load
regulation measured at the sense
pin is 1mV for an output voltage of
2.5V with a load step of 10mA to
7A.
The very fast transient loop
response easily meets the needs of
the latest microprocessors. In addi-
tion, a small capacitor on the Adjust
pin will further improve the tran-
sient capabilities.
Internal protection circuitry pro-
vides for Òbust-proofÓ operation,
similar to three-terminal regulators.
This circuitry, which includes over-
current, short circuit, supply
sequencing and overtemperature
protection will self protect the regu-
lator under all fault conditions.
The CS5257A-1 is ideal for generat-
ing a secondary 2-2.5V low voltage
supply on a motherboard where
both 5V and 3.3V are already avail-
able.
Features
s 1.25V to 5V VOUT at 7A
s VPOWER Dropout < 0.35V @ 7A
s VCONTROL Dropout < 1.10V @
7A
s 1.5% Trimmed Reference
s Fast Transient Response
s Remote Voltage Sensing
s Thermal Shutdown
s Current Limit
s Short Circuit Protection
s Drop-In Replacement for
LT1580
s Backwards Compatible with
3-pin Regulators
Package Options
Applications Diagram
5 Lead TO-220 5 Lead D2PAK
5.0V
3.3V
10mF
10V
VCONTROL VOUT
CS5257A-1
VPOWER VSENSE
Adjust
100mF
5V
0.1mF
5V
2.5V @ 7A
124
1%
124 Load
1%
300mF
5V
1
1. VSENSE
1 2. Adjust
3. VOUT
4. VCONTROL
5. VPOWER
Tab = VOUT
Rev. 4/5/99
Cherry Semiconductor Corporation
2000 South County Trail, East Greenwich, RI 02818
Tel: (401)885-3600 Fax: (401)885-5786
Email: [email protected]
Web Site: www.cherry-semi.com
1 A ¨ Company
1 page  
Typical Performance Characteristics: continued
Adjust Pin Current vs VCONTROL-VOUT
Ripple Rejection vs Frequency
75.00
74.00
VPOWER =2.05V
IL=10mA
73.00
72.00
71.00
70.00
1.0 2.0 3.0 4.0 5.0 6.0 7.0 8.0 9.0 10.0 11.0
VCONTROL-VOUT (V)
90.0
80.0
70.0
60.0
50.0
40.00
30.0
20.0
VIN-VOUT=2V
IOUT=4A
VRIPPLE=1VP-P
COUT=22mF
CADJ=0.1mF
10.0
101
102
103 104
Frequency (Hz)
105
Adjust Pin Current vs VPOWER - VOUT
VCONTROL Dropout Voltage vs IOUT
106
75.00
74.00
73.00
72.00
71.00
70.00
0.50
VCONTROL=2.75V
IL=10mA
1.50
2.50
VPOWER-VOUT (V)
3.50
4.50
1.250
VPOWER=2.05V
1.000
0.750
0.500
0.250
0.00
0.00 1.00 2.00 3.00 4.00
5.00 6.00 7.00
Output Current (A)
VPOWER Dropout Voltage vs IOUT
1.000
0.900
VCONTROL =2.75V
0.800
0.700
0.600
0.500
0.400
0.300
0.200
0.100
0.000
0.00 1.00
2.00 3.00 4.00 5.00
Output Current (A)
6.00 7.00
Minimum Load Current vs VPOWER-VOUT
916.400
916.300
916.200
916.100
916.000
915.900
915.800
915.700
915.600
915.500
915.400
0.50
VCONTROL =5V
D VOUT=+1%
1.50
2.50
VPOWER-VOUT (V)
3.50
4.50
5
5 Page | ||
| Páginas | Total 9 Páginas | |
| PDF Descargar | [ Datasheet CS5257A-1GDP5.PDF ] | |
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