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Cherry Semiconductor Corporation

CS5258-1 Datasheet Preview

CS5258-1 Datasheet

8A LDO 5-Pin Adjustable Linear Regulator

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CS5258-1
8A LDO 5-Pin Adjustable Linear Regulator
Description
This new very low dropout regula-
tor is designed to power the next
generation of advanced microproces-
sors. To achieve very low dropout,
the internal pass transistor is pow-
ered separately from the control cir-
cuitry. 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 a five-terminal TO-
220 package, which allows for the
implementation of a remote-sense
pin permitting very accurate regula-
tion 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 1mV for an output
voltage of 2.5V with a load step of
10mA to 8A.
The very fast transient loop response
easily meets the needs of the latest
microprocessors. In addition, a small
capacitor on the Adjust pin will fur-
ther improve the transient capabili-
ties.
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 CS5258-1 is ideal for generating
a secondary 2 - 2.5V low voltage
supply on a motherboard where
both 5V and 3.3V are already
available.
Features
s 1.25V to 5V VOUT at 8A
s VPOWER Dropout <0.4V @ 8A
s VCONTROL Dropout <1.15V @
8A
s 1.5% Trimmed Reference
s Fast Transient Response
s Remote Voltage Sensing
s Thermal Shutdown
s Current Limit
s Short Circuit Protection
s Backwards Compatible with
3-pin Regulators
Package Options
Applications Diagram
5 Lead TO-220
5.0V
3.3V
10mF
10V
Rev. 3/17/99
VCONTROL VOUT
CS5258-1
VPOWER VSENSE
Adjust
100mF
5V
0.1mF
5V
2.5V@8A
124
1%
124
1%
Load
300mF
5V
1. VSENSE
1 2. Adjust
3. VOUT
4. VCONTROL
5. VPOWER
Tab = VOUT
Cherry Semiconductor Corporation
2000 South County Trail, East Greenwich, RI 02818
Tel: (401)885-3600 Fax: (401)885-5786
Email: info@cherry-semi.com
Web Site: www.cherry-semi.com
1 A ¨ Company




Cherry Semiconductor Corporation

CS5258-1 Datasheet Preview

CS5258-1 Datasheet

8A LDO 5-Pin Adjustable Linear Regulator

No Preview Available !

Absolute Maximum Ratings
VPOWER Input Voltage .................................................................................................................................................................6V
VCONTROL Input Voltage ...........................................................................................................................................................13V
Operating Junction Temperature Range...........................................................................................................0¡C ² TJ ² 150¡C
Storage Temperature Range ................................................................................................................................-65¡C to +150¡C
ESD Damage Threshold............................................................................................................................................................2kV
Lead Temperature Soldering
Wave Solder (through hole styles only) .....................................................................................10 sec. max, 260¡C peak
Electrical Characteristics: 0¡C ² TA ² 70¡C, 0¡C ² TJ ² 150¡C, VSENSE = VOUT and VAdj = 0V unless otherwise specified.
PARAMETER
Reference Voltage
Line Regulation
Load Regulation
(Note 3)
Minimum Load Current
(Note 1)
TEST CONDITIONS
MIN
VCONTROL = 2.75V to 12V, VPOWER = 2.15V to 5.5V, 1.234
10mA ² IOUT ² 8A
(-1.5%)
VCONTROL = 2.5V to 12V, VPOWER = 1.75V to 5.5V,
IOUT = 10mA
VCONTROL = 2.75V, VPOWER = 2.15V,
IOUT = 10mA to 8A, with remote sense
VCONTROL = 5V, VPOWER = 3.3V, ÆVOUT= +1%
TYP
1.253
.02
.04
5
MAX UNIT
1.272 V
(+1.5%)
.20 %
.20 %
10 mA
Control Pin Current
(Note 2)
Adjust Pin Current
Current Limit
Short Circuit Current
Ripple Rejection
(Note 3)
Thermal Regulation
VCONTROL Dropout Voltage
(Minimum VCONTROL-VOUT)
(Note 4)
VPOWER Dropout Voltage
(Minimum VPOWER-VOUT)
(Note 4)
RMS Output Noise
Temperature Stability
VCONTROL = 2.75V, VPOWER = 2.15V, IOUT = 100mA
VCONTROL = 2.75V, VPOWER = 2.15V, IOUT = 4A
VCONTROL = 2.75V, VPOWER = 1.75V, IOUT = 4A
VCONTROL = 2.75V, VPOWER = 2.15V, IOUT = 8A
VCONTROL = 2.75V, VPOWER = 2.15V, IOUT = 10mA
VCONTROL = 2.75V, VPOWER = 2.15V, ÆVOUT= -1.5%
VCONTROL = 2.75V, VPOWER = 2.15V, VOUT = 0V
VCONTROL = VPOWER = 3.25V Avg,
VRipple = 1VP-P @ 120Hz, IOUT = 4A, CADJ = 0.1µF
30ms Pulse, TA = 25¡C
VPOWER = 2.15V, IOUT = 100mA
VPOWER = 2.15V, IOUT = 1A
VPOWER = 2.15V, IOUT = 2.75A
VPOWER = 2.15V, IOUT = 4A
VPOWER = 2.15V, IOUT = 8A
VCONTROL = 2.75V, IOUT = 100mA
VCONTROL = 2.75V, IOUT = 1A
VCONTROL = 2.75V, IOUT = 2.75A
VCONTROL = 2.75V, IOUT = 4A
VCONTROL = 2.75V, IOUT = 8A
Freq = 10Hz to 10kHz, TA = 25¡C
8.1
6.0
60
6
30
33
80
60
10.0
9.0
80
0.002
1.00
1.00
1.00
1.00
1.15
.10
.15
.20
.26
.40
0.003
0.5
10 mA
60 mA
70 mA
180 mA
120 µA
A
A
dB
%/W
1.15 V
1.15 V
1.15 V
1.15 V
1.30 V
.15 V
.20 V
.30 V
.40 V
.70 V
%VOUT
%
Thermal Shutdown (Note 5)
150 180 210 ¡C
Thermal Shutdown Hysteresis
25 ¡C
VCONTROL Supply Only
Output Current
VCONTROL = 13V, VPOWER not connected,
VADJUST = VOUT = VSENSE = 0V
50 mA
2


Part Number CS5258-1
Description 8A LDO 5-Pin Adjustable Linear Regulator
Maker Cherry Semiconductor Corporation
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