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부품번호 CS52510-1 기능
기능 10A LDO 5-Pin Adjustable Linear Regulator
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CS52510-1 데이터시트, 핀배열, 회로
CS52510−1
10 A LDO 5−Pin Adjustable
Linear Regulator
This new very low dropout regulator is designed to power the next
generation of advanced microprocessor. 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 PNPNPN based LDO
regulators. In this mode the dropout is determined by the minimum
control voltage.
It is supplied in a fiveterminal TO220 package, which allows for
the implementation of a remotesense 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 1.0 mV for
an output voltage of 2.5 V with a load step of 10 mA to 10 A.
The very fast transient loop response easily meets the needs of the
latest microprocessors. In addition, a small capacitor on the Adjust pin
will further improve the transient capabilities.
Internal protection circuitry provides for “bustproof” operation,
similar to threeterminal regulators. This circuitry, which includes
overcurrent, short circuit, supply sequencing and overtemperature
protection, will self protect the regulator under all fault conditions.
The CS525101 is ideal for generating a secondary 2.02.5 V low
voltage supply on a motherboard where both 5.0 V and 3.3 V are
already available.
Features
1.25 V to 5.0 V VOUT at 10 A
VPOWER Dropout < 0.65 V @ 10 A
VCONTROL Dropout < 1.25 V @ 10 A
1.5% Trimmed Reference
Fast Transient Response
Remote Voltage Sensing
Thermal Shutdown
Current Limit
Short Circuit Protection
Backwards Compatible with 3Pin Regulators
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1
5
TO220
FIVE LEAD
T SUFFIX
CASE 314D
Tab = VOUT
Pin 1. VSENSE
2. Adjust
3. VOUT
4. VCONTROL
5. VPOWER
MARKING DIAGRAM
CS525101
AWLYWW
1
A = Assembly Location
WL, L = Wafer Lot
YY, Y = Year
WW, W = Work Week
ORDERING INFORMATION
Device
CS525101GT5
Package
TO220
FIVE LEAD
Shipping
50 Units/Rail
© Semiconductor Components Industries, LLC, 2006
September, 2006 Rev. 6
1
Publication Order Number:
CS525101/D




CS52510-1 pdf, 반도체, 판매, 대치품
VPOWER
VCONTROL
CS525101
BIAS
and
TSD
VREF
EA
+
IA +
Figure 2. Block Diagram
VOUT
VSENSE
Adjust
TYPICAL PERFORMANCE CHARACTERISTICS
90
80
70
60
50
40
30
20
10101
VIN VOUT = 2.0 V
IOUT = 4.0 A
VRIPPLE = 1.0 VPP
COUT = 22 μF
CADJ = 0.1 μF
102 103 104
Frequency (Hz)
105
Figure 3. Ripple Rejection vs Frequency
106
75
VPOWER = 2.5 V
74 IL = 10 mA
73
72
71
701.0 2.0 3.0 4.0 5.0 6.0 7.0 8.0 9.0 10 11
VCONTROL VOUT (V)
Figure 4. Adjust Pin Current vs VCONTROL VOUT
916.4
916.3
916.2
VCONTROL = 5.0 V
ΔVOUT = +1.0%
916.1
916.0
915.9
915.8
915.7
915.6
915.5
915.40.5 1.5 2.5
VPOWER VOUT (V)
3.5
4.5
Figure 5. Minimum Load Current vs VPOWER VOUT
75
VCONTROL = 2.75 V
74 IL = 10 mA
73
72
71
700.5
1.5 2.5
VPOWER VOUT (V)
3.5
4.5
Figure 6. Adjust Pin Current vs VPOWER VOUT
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CS52510-1 전자부품, 판매, 대치품
CS525101
DESIGN GUIDELINES
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 17. The regulator’s
voltage sensing error amplifier maintains a fixed 1.253 V
reference between the output pin and the adjust pin.
VCONTROL
VOUT
CS525101
VPOWER
VSENSE
Adjust
R1
R2
Figure 17. An External Resistor Divider Sets the
Value of VOUT. The 1.253 V Reference Voltage
Drops 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 1.253 V across R1 and sets the
overall output voltage. The adjust pin current (typically
50 μA) 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 + 1.253 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 a least
10 mA. R1 and R2 should be of the same composition for
best tracking over temperature. The divider resistors should
be placed as close to the load as possible.
While not required, a bypass capacitor connected between
the adjust pin and ground will improve transient response
and ripple rejection. A 0.1 μF tantalum capacitor is
recommended for “first cut” design. Value and type may be
varied to optimize performance vs. price.
Other Adjustable Operation Considerations
The CS525101 linear regulator has an absolute
maximum specification of 6.0 V for the voltage difference
between VIN 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 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 VOUT is in
regulation. Further increase in the supply voltage brings the
pass transistor out of dropout. In this manner, any output
voltage less than 13 V may be regulated, provided the
VPOWER to VOUT differential is less than 6.0 V. In the case
where VCONTROL and VPOWER are shorted, there is no
theoretical limit to the regulated voltage as long as the
VPOWER to VOUT differential of 6.0 V is not exceeded.
There is a possibility of damaging the IC when VPOWER
VIN is greater than 6.0 V if a short circuit occurs. Short
circuit conditions will result in the immediate operation of
the pass transistor outside of its safe operating area.
Overvoltage stresses will then cause destruction of the pass
transistor before overcurrent or thermal shutdown circuitry
can become active. Additional circuitry may be required to
clamp the VPOWER to VOUT differential to less than 6.0 V
if fail safe operation is required. One possible clamp circuit
is illustrated in Figure 18; however, the design of clamp
circuitry must be done on an application by application
basis. Care must be taken to ensure the clamp actually
protects the design. Components used in the clamp design
must be able to withstand the short circuit condition
indefinitely while protecting the IC.
External Supply
VCONTROL VSENSE
VPOWER
VADJ
VOUT
Figure 18. Example Clamp Circuitry for
VPOWER VOUT > 6.0 V
Stability Considerations
The output compensation capacitor helps determine three
main characteristics of a linear regulator: startup delay,
load transient response, and loop stability.
The capacitor value and type is based on cost, availability,
size and temperature constraints. A tantalum or aluminum
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
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