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부품번호 CS5253B-1 기능
기능 LDO 5-Pin Adjustable Linear Regulator
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CS5253B-1 데이터시트, 핀배열, 회로
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CS5253B−1
3.0 A LDO 5−Pin Adjustable
Linear Regulator with
Remote Sense Applications
This new very low dropout linear regulator reduces total power
dissipation in the application. To achieve very low dropout, the
internal pass transistor is powered separately from the control
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 minimum
control voltage.
The CS5253B−1 is offered in a five−terminal D2PAK−5 package,
which allows for the implementation of a remote−sense pin permitting
very accurate regulation of output voltage directly at the load, where it
counts, rather than at the regulator. This remote sensing feature
virtually eliminates output voltage variations due to load changes and
resistive voltage drops. Typical load regulation measured at the sense
pin is less than 1.0 mV for an output voltage of 2.5 V with a load step
of 10 mA to 3.0 A.
The CS5253B−1 has a very fast transient loop response which can
be adjusted using a small capacitor on the Adjust pin.
Internal protection circuitry provides for “bust−proof” operation,
similar to three−terminal regulators. This circuitry, which includes
overcurrent, short circuit, and overtemperature protection will
self protect the regulator under all fault conditions.
The CS5253B−1 is ideal for generating a 2.5 V supply to power
graphics controllers used on VGA cards. Its remote sense and low
value capacitance requirements make this a low cost, high
performance solution. The CS5253B−1 is optimized from the
CS5253−1 to allow a lower value of output capacitor to be used at the
expense of a slower transient response.
Features
Pb−Free Package is Available*
VOUT Range is 1.25 V to 5.0 V @ 3.0 A
VPOWER Dropout < 0.40 V @ 3.0 A
VCONTROL Dropout < 1.05 V @ 3.0 A
1.0% Trimmed Reference
Fast Transient Response
Remote Voltage Sensing
Thermal Shutdown
Current Limit
Short Circuit Protection
Drop−In Replacement for EZ1582
Backwards Compatible with 3−Pin Regulators
Very Low Dropout Reduces Total Power Consumption
*For additional information on our Pb−Free strategy and soldering details, please
download the ON Semiconductor Soldering and Mounting Techniques
Reference Manual, SOLDERRM/D.
© Semiconductor Components Industries, LLC, 2004
June, 2004 − Rev. 5
1
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1
5
D2PAK−5
DP SUFFIX
CASE 936AC
Tab = VOUT
Pin 1. VSENSE
2. Adjust
3. VOUT
4. VCONTROL
5. VPOWER
MARKING DIAGRAM
CS
5253B−1
AWLYWW
1
A = Assembly Location
WL = Wafer Lot
Y = Year
WW = Work Week
ORDERING INFORMATION
Device
Package Shipping
CS5253B−1GDP5
D2PAK−5 50 Units/Rail
CS5253B−1GDPR5 D2PAK−5 750 Tape & Reel
CS5253B−1GDPR5G D2PAK−5 750 Tape & Reel
(Pb−Free)
†For information on tape and reel specifications,
including part orientation and tape sizes, please
refer to our Tape and Reel Packaging Specifications
Brochure, BRD8011/D.
Publication Order Number:
CS5253B−1/D




CS5253B-1 pdf, 반도체, 판매, 대치품
CS5253B−1
1.253
TYPICAL PERFORMANCE CHARACTERISTICS
0.12
1.252
1.251
0.10
0.08
TJ = 120°C
1.250
1.249
1.248
0.06
0.04
0.02
TJ = 20°C
TJ = 0°C
1.247
0 20 40 60 80 100 120
Junction Temperature (°C)
Figure 3. Reference Voltage vs Junction Temperature
0
0 0.5 1.0 1.5 2.0 2.5
Output Current (A)
Figure 4. Load Regulation vs Output Current
3.0
15 A/ms
VCONTROL = 5.0 V
VPOWER = 3.3 V
VOUT = 2.5 V
CCONTROL = 10 mF
CADJ = 0.1 mF
VOUT
CS5253−1
COUT = 330 mF
VOUT
CS5253B−1
COUT = 33 mF
80 A/ms
ILOAD
10 mA to 3.0 A
Figure 5. Transient Response Comparison between
CS5253−1 and CS5253B−1
5.0
4.5 Measured at DVOUT = −1.0%
4.0
3.5
3.0
2.5
2.0
1.5
1.0
0.5
00 1 2 3 4 5
VPOWER − VOUT (V)
Figure 6. Output Current vs VPOWER − VOUT
6
85
80
75
70
65
60 0 20 40 60 80 100 120 140
Junction Temperature (°C)
Figure 7. Adjust Pin Current vs Junction Temperature
1200
1150
1100
VPOWER = 3.3 V
DVOUT = +1.0%
1050
1000
950
900
850
800
1.0 2.0 3.0 4.0 5.0 6.0 7.0 8.0 9.0 10 11
VCONTROL − VOUT (V)
Figure 8. Minimum Load Current vs VCONTROL − VOUT
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CS5253B-1 전자부품, 판매, 대치품
CS5253B−1
DESIGN GUIDELINES
Remote Sense
Remote sense operation can be easily obtained with the
CS5253B−1 but some care must be paid to the layout and
positioning of the filter capacitors around the part. The
ground side of the input capacitors on the +5.0 V and +3.3 V
lines and the local VOUT−to−ground local output capacitor
on the IC output must be tied close to the ground connected
resistor voltage divider feedback network. The top resistor
of the divider must be connected directly to the VSENSE pin
of the regulator. This will establish the stability of the part.
This capacitor−divider resistor connection may then be
connected to ground remotely at the load, giving the ground
portion remote sense operation.
The VSENSE line can then be tied remotely at the load
connection, giving the feedback remote sense operation.
The remote sense lines should be Kelvin connected so as to
eliminate the effect of load current voltage drop. An optional
bypass capacitor may be used at the load to reduce the effect
of load variations and spikes.
+5.0 V
+3.3 V
VCONTROL
VOUT
+
10 mF
VPOWER
VSENSE
CS5253B−1
+
100 mF
Local
Connections
ADJ
RDIS
+Load
124
+
33 mF
124
Remote
Connections
+
Optional
GND
Figure 19. Remote Sense
RDIS
−Load
Adjustable Operation
This LDO adjustable regulator has an output voltage
range of 1.25 V to 5.0 V. An external resistor divider sets the
output voltage as shown in Figure 20. The regulator’s
voltage sensing error amplifier maintains a fixed 1.25 V
reference between the output pin and the adjust pin.
5.0 V
3.3 V
VCONTROL
VOUT
CS5253B−1
VPOWER
VSENSE
Adjust
2.5 V
@ 3.0 A
R1
R2
Figure 20. Typical Application Schematic. The
Resistor Divider Sets VOUT, With the Internal
1.260 V Reference Dropped Across R1.
A resistor divider network R1 and R2 causes a fixed
current to flow to ground. This current creates a voltage
across R2 that adds to the 1.25 V across R1 and sets the
overall output voltage. The adjust pin current (typically
50 mA) also flows through R2 and adds a small error that
should be taken into account if precise adjustment of VOUT
is necessary. The output voltage is set according to the
formula:
VOUT + 1.25 V
R1
)
R1
R2
)
R2
IADJ
The term IADJ × R2 represents the error added by the
adjust pin current. R1 is chosen so that the minimum load
current is at least 10 mA. R1 and R2 should be of the same
composition for best tracking overtemperature.
While not required, a bypass capacitor connected between
the adjust pin and ground will improve transient response
and ripple rejection. A 0.1 mF tantalum capacitor is
recommended for “first cut” design. Value and type may be
varied to optimize performance vs. price.
Other Adjustable Operation Considerations
The CS5253B−1 linear regulator has an absolute
maximum specification of 6.0 V for the voltage difference
between VPOWER and VOUT. However, the IC may be used
to regulate voltages in excess of 6.0 V. The two main
considerations in such a design are the sequencing of power
supplies and short circuit capability.
Power supply sequencing should be such that the
VCONTROL supply is brought up coincidentally with or
before the VPOWER supply. This allows the IC to begin
charging the output capacitor as soon as the VPOWER to
VOUT differential is large enough that the pass transistor
conducts. As VPOWER increases, the pass transistor will
remain in dropout, and current is passed to the load until
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