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CS5253B-1 Datasheet(PDF) 6 Page - ON Semiconductor

Part No. CS5253B-1
Description  3.0 A LDO 5-Pin Adjustable Linear Regulator with Remote Sense Applications
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Maker  ONSEMI [ON Semiconductor]
Homepage  http://www.onsemi.com
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CS5253B-1 Datasheet(HTML) 6 Page - ON Semiconductor

 
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CS5253B−1
http://onsemi.com
6
Figure 15. VPOWER Only Output Current vs Junction
Temperature
Figure 16. VCONTROL Supply Current vs Junction
Temperature
Figure 17. Current Limit vs VOUT
Figure 18. Stability vs ESR
020
60
40
140
Junction Temperature (
°C)
30
25
20
15
10
5
0
80
120
100
VPOWER = 6.0 V
VOUT = 0 V
VCONTROL Not Connected
020
60
40
140
Junction Temperature (
°C)
80
120
100
40
35
30
25
20
15
10
5
0
VCONTROL = 2.75 V
VPOWER = 2.05 V
IOUT = 3.0 A
IOUT = 1.0 A
IOUT = 100 mA
5.0
4.5
4.0
3.5
0
0.5
1.0
1.5
2.0
3.0
2.5
VOUT (V)
VPOWER = 3.3 V
VCONTROL = 5.0 V
VOUT set for 2.5 V
TA = 25°C
6
5
3
1
0
010
20
30
50
40
Capacitance (
mF)
60
70
80
90
100
4
2
VPOWER = 3.3 V
VCONTROL = 5.0 V
ILOAD = 0 to 3.0 A
Unstable
Stable Region
VOUT = 2.5 V
VOUT Shorted to VSENSE
TJ = 0°C to 150°C
APPLICATIONS NOTES
THEORY OF OPERATION
The CS5253B−1 linear regulator provides adjustable
voltages from 1.25 V to 5.0 V at currents up to 3.0 A. The
regulator is protected against short circuits, and includes a
thermal shutdown circuit with hysteresis. The output, which
is current limited, consists of a PNP−NPN transistor pair and
requires an output capacitor for stability. A detailed
procedure for selecting this capacitor is included in the
Stability Considerations section.
VPOWER Function
The CS5253B−1 utilizes a two supply approach to
maximize efficiency. The collector of the power device is
brought out to the VPOWER pin to minimize internal power
dissipation under high current loads. VCONTROL provides
for the control circuitry and the drive for the output NPN
transistor. VCONTROL should be at least 1.0 V greater than
the output voltage. Special care has been taken to ensure that
there are no supply sequencing problems. The output
voltage will not turn on until both supplies are operating. If
the control voltage comes up first, the output current will be
limited to about three milliamperes until the power input
voltage comes up. If the power input voltage comes up first,
the output will not turn on at all until the control voltage
comes up. The output can never come up unregulated.
The CS5253B−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.
Output Voltage Sensing
The CS5253B−1 five terminal linear regulator includes a
dedicated VSENSE function. This allows for true Kelvin
sensing of the output voltage. This feature can virtually
eliminate errors in the output voltage due to load regulation.
Regulation will be optimized at the point where the sense pin
is tied to the output.


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