CS5257A-1 Datasheet, PDF (1/11 Pages) Cherry Semiconductor Corporation – 7A LDO 5-Pin Adjustable Linear Regulator

CS5257A−1
7.0 A LDO 5−Pin Adjustable
Linear Regulator
This new very low dropout regulator is designed to power the next
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.
It is supplied in five−terminal TO−220−5 and D²PAK−5 packages,
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.
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 “bust−proof” operation,
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.
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.
Features
• 1.25 V to 5.0 V V_OUT at 7.0 A
• V_POWER Dropout < 0.35 V @ 7.0 A
• V_CONTROL Dropout < 1.1 V @ 7.0 A
• 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
© Semiconductor Components Industries, LLC, 2006
1
September, 2006 − Rev. 10
http://onsemi.com
1
5
1
5
TO−220−5
T SUFFIX
CASE 314D
Tab = V_OUT
Pin 1. V_SENSE
2. Adjust
3. V_OUT
4. V_CONTRO
5. V_POWER
D²PAK−5
DP SUFFIX
CASE 936AC
MARKING DIAGRAMS
TO−220−5
D²PAK−5
CS5257A−1
AWLYWW
CS
5257A−1
AWLYWW
1
1
A
= Assembly Location
WL, L = Wafer Lot
YY, Y = Year
WW, W = Work Week
ORDERING INFORMATION
Device
Package
Shipping^†
CS5257A−1GT5 ^{TO−220−5} 50 Units/Rail
CS5257A−1GDP5 D²PAK−5 50 Units/Rail
CS5257A−1GDPR5 D²PAK−5 750 Tape & Reel
†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:
CS5257A−1/D