CS5257A-1GDPR5 Cherry Semiconductor Corporation, CS5257A-1GDPR5 Datasheet

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CS5257A-1GDPR5

Manufacturer Part Number
CS5257A-1GDPR5
Description
7A LDO 5-pin adjustible linear regulator
Manufacturer
Cherry Semiconductor Corporation
Datasheet

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Part Number
Manufacturer
Quantity
Price
Part Number:
CS5257A-1GDPR5
Manufacturer:
ON/安森美
Quantity:
20 000
Rev. 4/5/99
7A LDO 5-Pin Adjustable Linear Regulator
This new very low dropout regula-
tor is designed to power the next
generation of advanced micropro-
cessors. To achieve very low
dropout, the internal pass transistor
is powered separately from the con-
trol 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 mini-
mum control voltage.
It is supplied in five-terminal
TO-220 and D
allowing for the implementation of
a remote-sense pin permitting very
accurate regulation of output volt-
age directly at the load, where it
counts, rather than at the regulator.
This remote sensing feature virtual-
ly eliminates output voltage varia-
tions due to load changes and resis-
tive voltage drops. Typical load
5.0V
10mF
10V
3.3V
2
PAK packages,
100mF
5V
V
V
Description
Applications Diagram
POWER
CONTROL
CS5257A-1
Adjust
V
0.1mF
5V
SENSE
V
OUT
regulation measured at the sense
pin is 1mV for an output voltage of
2.5V with a load step of 10mA to
7A.
The very fast transient loop
response easily meets the needs of
the latest microprocessors. In addi-
tion, a small capacitor on the Adjust
pin will further improve the tran-
sient capabilities.
Internal protection circuitry pro-
vides for Òbust-proofÓ operation,
similar to three-terminal regulators.
This circuitry, which includes over-
current, short circuit, supply
sequencing and overtemperature
protection will self protect the regu-
lator under all fault conditions.
The CS5257A-1 is ideal for generat-
ing a secondary 2-2.5V low voltage
supply on a motherboard where
both 5V and 3.3V are already avail-
able.
CS5257A-1
124
1%
124
1%
Load
1
2.5V @ 7A
300mF
5V
2000 South County Trail, East Greenwich, RI 02818
Tel: (401)885-3600 Fax: (401)885-5786
5 Lead TO-220
Cherry Semiconductor Corporation
Web Site: www.cherry-semi.com
V
V
7A
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
1.25V to 5V V
Email: info@cherry-semi.com
POWER
CONTROL
Package Options
1
Features
Dropout < 0.35V @ 7A
A
Dropout < 1.10V @
OUT
5 Lead D
1. V
2. Adjust
3. V
4. V
5. V
Tab = V
at 7A
SENSE
OUT
POWER
1
CONTROL
¨
OUT
Company
2
PAK

Related parts for CS5257A-1GDPR5

CS5257A-1GDPR5 Summary of contents

Page 1

... This circuitry, which includes over- current, short circuit, supply sequencing and overtemperature protection will self protect the regu- lator under all fault conditions. The CS5257A-1 is ideal for generat- ing a secondary 2-2.5V low voltage supply on a motherboard where both 5V and 3.3V are already avail- able. ...

Page 2

V Input Voltage .................................................................................................................................................................6V POWER V Input Voltage ...........................................................................................................................................................13V CONTROL Operating Junction Temperature Range...........................................................................................................0¡C ² T Storage Temperature Range ................................................................................................................................-65¡C to +150¡C Lead Temperature Soldering Wave Solder (through hole styles only) .....................................................................................10 sec. max, 260¡C peak Reflow (SMD styles only) ...

Page 3

Electrical Characteristics: 0¡C ² T PARAMETER V Supply Only V POWER POWER Output Current V ADJUST Note 1: The minimum load current is the minimum current required to maintain regulation. Normally the current in the resistor divider used to set ...

Page 4

Reference Voltage vs Temperature 0.100 0.075 0.050 0.025 -0.000 -0.025 -0.050 I =10mA 0 -0.075 V =2.75V, CONTROL -0.100 V =2.05V POWER -0.125 -0.150 100 110120130 T (°C) J Transient ...

Page 5

Typical Performance Characteristics: continued Adjust Pin Current vs V CONTROL 75.00 V =2.05V POWER IL=10mA 74.00 73.00 72.00 71.00 70.00 1.0 2.0 3.0 4.0 5.0 6.0 7 (V) CONTROL OUT Adjust Pin Current vs V POWER - 75.00 ...

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 0.1µF tantalum capacitor is recom- mended for Òfirst cutÓ design. Value and type may be var- ied to optimize performance vs. price. Other Adjustable Operation Considerations The CS5257A-1 linear regulator has an absolute maximum specification of 6V for the voltage difference between V and V . However, the IC may be used to regulate volt- OUT ages in excess of 6V ...

Page 8

... QSA The value for R the TO-220 and D lator such as the CS5257A-1 the majority of heat is generat the power transistor section. The value for R depends on the heat sink type, while the R 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 9

... Ordering Information Part Number Description CS5257A-1GT5 5L TO-220 Straight 2 CS5257A-1GDP5 CS5257A-1GDPR5 5L D Rev. 4/5/99 Package Specification Thermal Data R QJC R QJA 1.40 (.055) *Depending on thermal properties of substrate. R 1.14 (.045) 2.74(.108) 2.49(.098) 2.79 (.110) 2.29 (.090) .254 (.010) REF 5 Lead TO-220 (T) Straight 4 ...

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