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CS5203-3GDPR3 데이터시트 PDF




Cherry Semiconductor Corporation에서 제조한 전자 부품 CS5203-3GDPR3은 전자 산업 및 응용 분야에서
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부품번호 CS5203-3GDPR3 기능
기능 3A/ 3.3V Fixed Linear Regulator
제조업체 Cherry Semiconductor Corporation
로고 Cherry Semiconductor Corporation 로고


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CS5203-3GDPR3 데이터시트, 핀배열, 회로
CS5203-3
3A, 3.3V Fixed Linear Regulator
Description
The CS5203-3 linear regulator
provides a 3.3V reference at 3A
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 pro-
vide 3A of output current with
dropout voltages of less than
1.15V. The maximum quiescent
current is only 10mA at full
load. Device protection includes
overcurrent and thermal shut-
down.
The CS5203-3 is pin compatible
with the LT1085 family of linear
regulators.
The regulator is available in a
surface mount D2 package.
Features
s Output Current to 3A
s Output Accuracy to ±1.5%
Over Temperature
s Dropout Voltage (typical)
1.15V @ 3A
s Fast Transient Response
s Fault Protection
Current Limit
Thermal Shutdown
5V
100mF
5V
Rev. 6/3/98
Application Diagram
VIN VOUT
CS5203-3
GND
3.3V
@ 3A
Package Options
3L D2PAK
Tab (VOUT)
10mF
5V
1
CS5203 -3
1 Gnd
2 VOUT (Tab)
3 VIN
Consult factory for other package
options.
Cherry Semiconductor Corporation
2000 South County Trail, East Greenwich, RI 02818
Tel: (401)885-3600 Fax: (401)885-5786
Web Site: www.cherry-semi.com
1 A ¨ Company




CS5203-3GDPR3 pdf, 반도체, 판매, 대치품
Typical Performance Characteristics: continued
+200
DVOUT 0
(mV)
-200
3
2
I(A)
1
0
0
Transient Response
6.00
5.00
4.00
VIN = 5V
VOUT = 3.3V
CIN = 100mF
COUT = 10mF Tantalum
3.00
2.00
1.00
5
Time (ms)
0.00
10 1.0 1.50 2.0 2.5 3.0 3.5
VIN-VOUT (V)
Short Circuit Current vs. VIN - VOUT
Applications Information
The CS5203-3 linear regulator provides a fixed 3.3V out-
put voltage at currents up to 3A. The regulator is protect-
ed against overcurrent conditions and includes thermal
shutdown.
The CS5203-3 has a composite PNP-NPN output transistor
and requires an output capacitor for stability.
Stability Considerations
The output or compensation capacitor helps determine
three main characteristics of a linear regulator: start-up
delay, load transient response and loop stability.
The capacitor value and type are based on cost, availabili-
ty, size and temperature constraints. A tantalum or alu-
minum electrolytic capacitor is best, since a film or ceramic
capacitor with almost zero ESR can cause instability. The
aluminum electrolytic capacitor is the least expensive solu-
tion. However, when the circuit operates at low tempera-
tures, both the value and ESR of the capacitor will vary
considerably. The capacitor manufacturersÕ data sheet pro-
vides this information.
A 22µF tantalum capacitor will work for most applications,
but with high current regulators such as the CS5203-3 the
transient response and stability improve with higher val-
ues of capacitance. The majority of applications for this
regulator involve large changes in load current so the out-
put capacitor must supply the instantaneous load current.
The ESR of the output capacitor causes an immediate drop
in output voltage given by:
ÆV = ÆI ´ ESR
For microprocessor applications it is customary to use an
output capacitor network consisting of several tantalum
and ceramic capacitors in parallel. This reduces the overall
ESR and reduces the instantaneous output voltage drop
under load transient conditions. The output capacitor net-
work should be as close as possible to the load for the best
results.
Protection Diodes
When large external capacitors are used with a linear regu-
lator it is sometimes necessary to add protection diodes. If
the input voltage of the regulator gets shorted, the output
capacitor will discharge into the output of the regulator.
The discharge current depends on the value of the capaci-
tor, the output voltage and the rate at which VIN drops. In
the CS5203-3 linear regulator, the discharge path is
through a large junction and protection diodes are not
usually needed. If the regulator is used with large values
of output capacitance and the input voltage is instanta-
neously shorted to ground, damage can occur. In this case,
a diode connected as shown in Figure 1 is recommended.
VIN
C1
IN4002 (optional)
VIN VOUT
CS5203-3
GND
VOUT
C2
Figure 1. Protection diode scheme for large output capacitors.
Output Voltage Sensing
Since the CS5203-3 is a three terminal regulator, it is not
possible to provide true remote load sensing. Load regula-
tion is limited by the resistance of the conductors connect-
ing the regulator to the load. For best results, the regulator
should be connected as shown in figure 2.
4

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부품번호상세설명 및 기능제조사
CS5203-3GDPR3

3A/ 3.3V Fixed Linear Regulator

Cherry Semiconductor Corporation
Cherry Semiconductor Corporation

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