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PDF CS5201-3GDP3 Data sheet ( Hoja de datos )
| Número de pieza | CS5201-3GDP3 | |
| Descripción | 1A/ 3.3V Fixed Linear Regulator | |
| Fabricantes | Cherry Semiconductor Corporation | |
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CS5201-3
1A, 3.3V Fixed Linear Regulator
Description
The CS5201-3 linear regulator
provides a 1A@ 3.3V reference
at 1A with an output voltage
accuracy of ±1.5%.
This regulator is intended for
use as a post regulator and
microprocessor supply. The fast
loop response and low dropout
voltage make this regulator
ideal for applications where low
voltage operation and good
transient response are impor-
tant.
The circuit is designed to oper-
ate with dropout voltages less
than 1.2V at 1A output current.
The maximum quiescent current
is only 10mA at full load.
Device protection includes over-
current and thermal shutdown.
The CS5201-3 is pin compatible
with the LT1086 family of linear
regulators.
The regulator is available in
TO-220, surface mount D2, and
SOT-223 packages.
Features
s Output Current to 1A
s Output Accuracy to ±1.5%
Over Temperature
s Dropout Voltage (typical)
1.0V @ 1A
s Fast Transient Response
s Fault Protection
Current Limit
Thermal Shutdown
Application Diagram
Package Options
3L TO-220
Tab (VOUT)
3L D2PAK
Tab (VOUT)
10mF
5V
VIN VOUT
CS5201-3
GND
3.3V
@ 1A
22mF
5V
1
1 3L SOT-223
Tab (VOUT)
CS5201 -3
1 Gnd
2 VOUT (Tab)
3 VIN
1
Consult factory for other fixed output
voltage versions.
Rev. 2/18/98
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  
Applications Information: continued
VIN VIN
conductor
RC parasitic resistance
VOUT
CS5201-3
RLOAD
Figure 2. Conductor parasitic resistance effects can be minimized with
the above grounding scheme for fixed output regulators.
Calculating Power Dissipation and Heat Sink Requirements
The CS5201-3 linear regulator includes thermal shutdown
and current limit circuitry to protect the device. High
power regulators such as these usually operate at high
junction temperatures so it is important to calculate the
power dissipation and junction temperatures accurately to
ensure that an adequate heat sink is used.
The case is connected to VOUT on the CS5201-3, and electri-
cal isolation may be required for some applications.
Thermal compound should always be used with high cur-
rent regulators such as these.
The thermal characteristics of an IC depend on the follow-
ing four factors:
1. Maximum Ambient Temperature TA (¡C)
2. Power dissipation PD (Watts)
3. Maximum junction temperature TJ (¡C)
4. Thermal resistance junction to ambient RQJA (C/W)
These four are related by the equation
TJ = TA + PD ´ RQJA
(1)
The maximum ambient temperature and the power dissi-
pation are determined by the design while the maximum
junction temperature and the thermal resistance depend
on the manufacturer and the package type.
The maximum power dissipation for a regulator is:
PD(max)={VIN(max)ÐVOUT(min)}IOUT(max)+VIN(max)IQ
(2)
where
VIN(max) is the maximum input voltage,
VOUT(min) is the minimum output voltage,
IOUT(max) is the maximum output current, for the application
IQ is the maximum quiescent current at IOUT(max).
A heat sink effectively increases the surface area of the
package to improve the flow of heat away from the IC and
into the surrounding air.
Each material in the heat flow path between the IC and the
outside environment has a thermal resistance. Like series
electrical resistances, these resistances are summed to
determine RQJA, the total thermal resistance between the
junction and the surrounding air.
1. Thermal Resistance of the junction to case, RQJC (¡C/W)
2. Thermal Resistance of the case to Heat Sink, RQCS (¡C/W)
3. Thermal Resistance of the Heat Sink to the ambient air,
RQSA (¡C/W)
These are connected by the equation:
RQJA = RQJC + RQCS + RQSA
(3)
The value for RQJA is calculated using equation (3) and the
result can be substituted in equation (1).
The value for RQJC is 3.5ûC/W. For a high current regula-
tor such as the CS5201-3 the majority of the heat is generat-
ed in the power transistor section. The value for RQSA
depends on the heat sink type, while RQCS depends on fac-
tors such as package type, heat sink interface (is an insula-
tor and thermal grease used?), and the contact area
between the heat sink and the package. Once these calcula-
tions are complete, the maximum permissible value of
RQJA can be calculated and the proper heat sink selected.
For further discussion on heat sink selection, see applica-
tion note ÒThermal Management for Linear Regulators.Ó
5
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| Páginas | Total 6 Páginas | |
| PDF Descargar | [ Datasheet CS5201-3GDP3.PDF ] | |
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