cs5257a-1 ON Semiconductor, cs5257a-1 Datasheet

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cs5257a-1

Manufacturer Part Number
cs5257a-1
Description
7.0 A Ldo 5?pin Adjustable Linear Regulator
Manufacturer
ON Semiconductor
Datasheet

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CS5257A−1
7.0 A LDO 5−Pin Adjustable
Linear Regulator
generation of advanced microprocessors. 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.
allowing 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 1.0 mV for an output voltage of 2.5 V with a load step of 10 mA
to 7.0 A.
latest microprocessors. In addition, a small capacitor on the Adjust pin
will further improve the transient capabilities.
similar to three−terminal regulators. This circuitry, which includes
overcurrent, short circuit, supply sequencing and overtemperature
protection will self protect the regulator under all fault conditions.
low voltage supply on a motherboard where both 5.0 V and 3.3 V are
already available.
Features
© Semiconductor Components Industries, LLC, 2006
September, 2006 − Rev. 10
This new very low dropout regulator is designed to power the next
It is supplied in five−terminal TO−220−5 and D
The very fast transient loop response easily meets the needs of the
Internal protection circuitry provides for “bust−proof” operation,
The CS5257A−1 is ideal for generating a secondary 2.0 V − 2.5 V
1.25 V to 5.0 V V
V
V
1.5% Trimmed Reference
Fast Transient Response
Remote Voltage Sensing
Thermal Shutdown
Current Limit
Short Circuit Protection
Drop−In Replacement for LT1580
Backwards Compatible with 3−Pin Regulators
POWER
CONTROL
Dropout < 0.35 V @ 7.0 A
Dropout < 1.1 V @ 7.0 A
OUT
at 7.0 A
2
PAK−5 packages,
1
1
†For information on tape and reel specifications,
CS5257A−1GT5
CS5257A−1GDP5
CS5257A−1GDPR5
including part orientation and tape sizes, please
refer to our Tape and Reel Packaging Specifications
Brochure, BRD8011/D.
Device
5
1
CS5257A−1
TO−220−5
1
AWLYWW
ORDERING INFORMATION
A
WL, L
YY, Y
WW, W = Work Week
5
MARKING DIAGRAMS
http://onsemi.com
CASE 314D
CASE 936AC
TO−220−5
T SUFFIX
DP SUFFIX
= Assembly Location
= Wafer Lot
= Year
D
TO−220−5
2
D
D
Package
PAK−5
2
2
PAK−5
PAK−5
Publication Order Number:
1
AWLYWW
D
5257A−1
2
PAK−5
Tab = V
Pin
750 Tape & Reel
50 Units/Rail
50 Units/Rail
CS5257A−1/D
Shipping
CS
1. V
2. Adjust
3. V
4. V
5. V
OUT
SENSE
OUT
CONTRO
POWER

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cs5257a-1 Summary of contents

Page 1

... This circuitry, which includes overcurrent, short circuit, supply sequencing and overtemperature protection will self protect the regulator under all fault conditions. The CS5257A−1 is ideal for generating a secondary 2.0 V − 2.5 V low voltage supply on a motherboard where both 5.0 V and 3.3 V are already available. ...

Page 2

... This current will track output current with roughly a 1:100 CONTROL ratio. The minimum value is equal to the quiescent current of the device CONTROL OUT CS5257A− POWER SENSE Adjust 100 mF 0 ...

Page 3

... ELECTRICAL CHARACTERISTICS (continued) otherwise specified.) Characteristic CS5257A−1 Short Circuit Current V CONTROL Ripple Rejection (Note 6) V CONTROL V C Thermal Regulation 30 ms Pulse Dropout Voltage V CONTROL POWER (Minimum V − CONTROL OUT POWER (Note 7) V POWER V POWER V POWER V Dropout Voltage V POWER ...

Page 4

V POWER V CONTROL BIAS and TSD TYPICAL PERFORMANCE CHARACTERISTICS 0.100 0.075 0.050 0.025 0 −0.025 −0.050 −0.075 −0.100 V = 2.75 V CONTROL V = 2.05 V −0.125 POWER −0.150 ...

Page 5

Temperature (°C) Figure 7. Adjust Pin Current vs Temperature 2.05 V POWER ...

Page 6

... The output can never come up unregulated. The CS5257A−1 can also be used as a single supply device with the control and power inputs tied together. In this mode, the dropout will be determined by the minimum control voltage ...

Page 7

... 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 CS5257A−1 linear regulator has an absolute maximum specification of 6.0 V for the voltage difference between V and V . However, the IC may be used to ...

Page 8

... The discharge current depends on the value of the capacitor, the output voltage, and the rate at which V the CS5257A−1 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 instantaneously shorted to ground, damage can occur ...

Page 9

... R QJA + R QJC ) R QCS ) R QSA The value for R both the TO−220−5 and D current regulator such as the CS5257A−1 the majority of heat is generated in the power transistor section. The value for R depends on the heat sink type, while the R qSA depends on factors such as package type, heat sink interface (is an insulator and thermal grease used?), and the contact area between the heat sink and the package ...

Page 10

PACKAGE DIMENSIONS C −Q− 0.356 (0.014 TO−220−5 T SUFFIX CASE 314D−04 ISSUE E SEATING −T− NOTES: PLANE 1. DIMENSIONING ...

Page 11

... Kamimeguro, Meguro−ku, Tokyo, Japan 153−0051 Phone: 81−3−5773−3850 http://onsemi.com PAK−5 Unit 1.4 °C/W 10−50* °C qCA ON Semiconductor Website: http://onsemi.com Order Literature: http://www.onsemi.com/litorder For additional information, please contact your local Sales Representative. CS5257A−1/D ...

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