CS52510-1 datasheet(6/10 Pages) ONSEMI

6 / 10 page

CS52510−1

http://onsemi.com

Figure 13. Reference Voltage vs Temperature

Figure 14. Load Regulation vs Output Current

Figure 15. Adjust Pin Current vs Temperature

Figure 16. Current Step Transient Response

TJ (°C)

−0.150

−0.050

0.100

−0.100

130

IO = 10 mA

VCONTROL = 2.75 V

VPOWER = 2.5 V

0.050

−0.075

0.075

−0.125

−0.025

0.025

80 90

110

100

120

Output Current (A)

2.0

0.35

4.0

6.0

8.0

0.30

0.25

0.20

0.15

0.10

0.05

TCase = 25°C

TCase = 125°C

TCase = 0°C

Temperature (°C)

100

120

140

160

Time (μs)

100

COUT = 330 μF

CPOWER = 110 μF

CCONTROL = 10 μF

CADJ = 25 μF

VCONTROL = 5.0 V

VPOWER = 3.3 V

VOUT = 2.5 V

−50

−100

7.0

APPLICATIONS NOTES

THEORY OF OPERATION

The CS52510−1 linear regulator provides adjustable

voltages from 1.25 V to 5.0 V at currents up to 10 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 CS52510−1 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

power 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 typically limited to about 3.0 mA 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 CS52510−1 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 CS52510−1 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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