CS52015−1

http://onsemi.com

4

10

Temperature (°C)

Frequency (Hz)

Figure 7. Adjust Pin Current vs.

Temperature

Figure 8. Ripple Rejection vs. Frequency

Time (mS)

Figure 9. Transient Response

Figure 10. Short Circuit Current vs.

85

3.5

300

0

70

65

60

55

50

45

40

0

20 30 40 50 60 70 80 90 100 110 120 130

75

65

55

45

35

25

15

3.3

3.1

2.9

2.7

2.5

2.3

2.1

1.9

1.7

1.5

1.0

200

100

0

−100

−200

1500

750

0

1

2

345

6

7

89

10

1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 6.0 6.5 7.0

APPLICATIONS INFORMATION

The CS52015−1 linear regulator provides adjustable

voltages at currents up to 1.5 A. The regulator is protected

against overcurrent conditions and includes thermal

shutdown.

The CS52015−1 has a composite PNP−NPN output

transistor and requires an output capacitor for stability. A

detailed procedure for selecting this capacitor is included in

the Stability Considerations section.

Adjustable Operation

The CS52015−1 has an output voltage range of 1.25 V to

5.5 V. An external resistor divider sets the output voltage as

shown in Figure 11. The regulator maintains a fixed 1.25V

(typical) reference between the output pin and the adjust pin.

A resistor divider network R1 and R2 causes a fixed current

to flow to ground. This current creates a voltage across R2

that adds to the 1.25 V across R1 and sets the overall output

voltage. The adjust pin current (typically 50

mA) also flows

through R2 and adds a small error that should be taken into

The output voltage is set according to the formula:

VOUT + VREF

R1 ) R2

R1

) IAdj

R2

pin current.