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Cherry Semiconductor Corporation

CS5253-1 Datasheet Preview

CS5253-1 Datasheet

3A LDO 5-Pin Adjustable Linear Regulator

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CS5253-1
3A LDO 5-Pin Adjustable Linear Regulator
Description
Features
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 a five-terminal
D2PAK package, which allows for
the implementation of a remote-
sense pin permitting very accurate
regulation of output voltage direct-
ly at the load, where it counts,
rather than at the regulator. This
remote sensing feature virtually
eliminates output voltage varia-
tions due to load changes and resis-
tive voltage drops. Typical load
regulation measured at the sense
pin is less than 1mV for an output
voltage of 2.5V with a load step of
10mA to 3A.
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, and over-tem-
perature protection will self protect
the regulator under all fault condi-
tions.
The CS5253-1 is ideal for generating
a secondary 2-2.5V low voltage
supply on a motherboard where
both 5V and 3.3V are already avail-
able.
s 1.25V to 5V VOUT at 3A
s VPOWER Dropout < 0.40V @ 3A
s VCONTROL Dropout < 1.05V @
3A
s 1% Trimmed Reference
s Fast Transient Response
s Remote Voltage Sensing
s Thermal Shutdown
s Current Limit
s Short Circuit Protection
s Drop-In Replacement for
Semtech EZ1582
s Backwards Compatible with
3-pin Regulators
Package Options
Applications Diagram
5 Lead D2PAK
5.0V
3.3V
10mF
10V
VCONTROL VOUT
CS5253-1
VPOWER VSENSE
Adjust
100mF
5V
0.1mF
5V
2.5V @ 3A
124
1%
124 Load
1%
300mF
5V
1 1. VSENSE
2. Adjust
3. VOUT
4. VCONTROL
5. VPOWER
Tab = VOUT
Rev. 5/6/99
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

CS5253-1 Datasheet Preview

CS5253-1 Datasheet

3A 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
Lead Temperature Soldering
Reflow (SMD styles only) ......................................................................................60 sec. max above 183¡C, 230¡C peak
ESD Damage Threshold............................................................................................................................................................2kV
Electrical Characteristics: 0¡C²TA ² 70¡C, 0¡C²TJ ² 150¡C, VSENSE = VOUT and VAdj = 0V unless otherwise specified.
PARAMETER
TEST CONDITIONS
MIN
Reference Voltage
Line Regulation
Load Regulation
VCONTROL=2.75V to 12V,
VPOWER=2.05V to 5.5V, IOUT = 10mA to 3A
VCONTROL = 2.5V to 12V,
VPOWER = 1.75V to 5.5V, IOUT = 10mA
VCONTROL = 2.75V,
VPOWER = 2.05V, IOUT = 10mA to 3A,
with remote sense
Minimum Load Current
(Note 1)
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 = 5V, VPOWER = 3.3V,
ÆVOUT = +1%
VCONTROL = 2.75V, VPOWER = 2.05V, IOUT = 100mA
VCONTROL = 2.75V, VPOWER = 2.05V, IOUT = 3A
VCONTROL =2.75V, VPOWER = 2.05V, IOUT = 10mA
VCONTROL = 2.75V, VPOWER = 2.05V,
ÆVOUT = -1%
VCONTROL = 2.75V, VPOWER = 2.05V, VOUT = 0V
VCONTROL = VPOWER = 3.25V,
VRIPPLE = 1VP-P@120Hz,
IOUT = 4A, CADJ = 0.1µF
30ms Pulse, TA=25¡C
VPOWER = 2.05V, IOUT = 100mA
VPOWER = 2.05V, IOUT = 1A
VPOWER = 2.05V, IOUT = 3A
VCONTROL = 2.75V, IOUT = 100mA
VCONTROL = 2.75V, IOUT = 1A
VCONTROL = 2.75V, IOUT = 3A
Freq = 10Hz to 10kHz, TA = 25¡C
Thermal Shutdown (Note 5)
Thermal Shutdown Hysteresis
VCONTROL Supply Only
Output Current
VPOWER Supply Only
Output Current
VCONTROL = 13V, VPOWER not connected,
VADJUST = VOUT = VSENSE = 0V
VPOWER = 6V, VCONTROL not connected,
VADJUST = VOUT = VSENSE = 0V
1.237
(-1%)
3.1
2.6
60
0.5
150
TYP
1.250
.02
MAX
1.263
(+1%)
.20
UNIT
V
%
.04 .30
%
5 10
6 10
35 120
60 120
4.0
3.5
80
mA
mA
mA
µA
A
A
dB
0.002
%/W
0.90 1.15
1.00 1.15
1.05 1.30
V
V
V
.05 .15
.15 .25
.40 .60
V
V
V
0.003
%VOUT
%
180 210
¡C
25 ¡C
50 mA
0.1 1.0
mA
Note 1:
Note 2:
Note 3:
Note 4:
Note 5:
The minimum load current is the minimum current required to maintain regulation. Normally the current in the resistor divider used to set
the output voltage is selected to meet the minimum load current requirement.
The VCONTROL pin current is the drive current required for the output transistor. This current will track output current with roughly a 1:100
ratio. The minimum value is equal to the quiescent current of the device.
This parameter is guaranteed by design and is not 100% production tested.
Dropout is defined as either the minimum control voltage, (VCONTROL) or minimum power voltage (VPOWER) to output voltage differential
required to maintain 1% regulation at a particular load current.
This parameter is guaranteed by design, but not parametrically tested in production. However, a 100% thermal shutdown functional test is
performed on each part.
2


Part Number CS5253-1
Description 3A LDO 5-Pin Adjustable Linear Regulator
Maker Cherry Semiconductor Corporation
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CS5253-1 Datasheet PDF






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