CS5253B-1 ONSEMI [ON Semiconductor], CS5253B-1 Datasheet - Page 6

• Manufacturer Part Number: CS5253B-1
• Description: 3.0 A LDO 5-Pin Adjustable Linear Regulator with Remote Sense Applications
• Manufacturer: ONSEMI [ON Semiconductor]

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.
V
maximize efficiency. The collector of the power device is
brought out to the V
dissipation under high current loads. V
for the control circuitry and the drive for the output NPN
transistor. V
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
POWER
The CS5253B−1 linear regulator provides adjustable
The CS5253B−1 utilizes a two supply approach to
Figure 15. V
5.0
4.5
4.0
3.5
30
25
20
15
10
5
0
0
0
Function
V
V
V
POWER
OUT
CONTROL
CONTROL
Figure 17. Current Limit vs V
20
0.5
= 0 V
THEORY OF OPERATION
POWER
= 6.0 V
Not Connected
POWER
40
Junction Temperature ( C)
should be at least 1.0 V greater than
Only Output Current vs Junction
Temperature
1.0
pin to minimize internal power
60
V
OUT
1.5
(V)
80
CONTROL
V
V
V
T
2.0
A
POWER
CONTROL
OUT
100
= 25 C
OUT
set for 2.5 V
APPLICATIONS NOTES
= 3.3 V
2.5
provides
= 5.0 V
120
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CS5253B−1
140
3.0
6
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.
with the control and power inputs tied together. In this mode,
the dropout will be determined by the minimum control
voltage.
Output Voltage Sensing
dedicated V
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.
The CS5253B−1 can also be used as a single supply device
The CS5253B−1 five terminal linear regulator includes a
Figure 16. V
40
35
30
25
20
15
10
6
5
4
3
2
1
0
5
0
0
0
10
20
V
V
I
SENSE
LOAD
POWER
CONTROL
20
Figure 18. Stability vs ESR
CONTROL
= 0 to 3.0 A
30
40
function. This allows for true Kelvin
Junction Temperature ( C)
= 3.3 V
Temperature
= 5.0 V
Capacitance (mF)
Stable Region
40
Supply Current vs Junction
Unstable
60
50
V
V
T
OUT
OUT
J
= 0 C to 150 C
80
60
= 2.5 V
Shorted to V
V
V
CONTROL
POWER
70
I
I
I
100
OUT
OUT
OUT
80
= 2.05 V
= 3.0 A
= 1.0 A
= 100 mA
= 2.75 V
SENSE
120
90 100
140