CS52015-1 datasheet(4/9 Pages) ONSEMI | 1.5 A Adjustable Linear Regulator

4 page

CS52015−1

http://onsemi.com

Temperature (°C)

Frequency (Hz)

Figure 7. Adjust Pin Current vs.

Temperature

Figure 8. Ripple Rejection vs. Frequency

Time (mS)

VIN − VOUT (V)

Figure 9. Transient Response

Figure 10. Short Circuit Current vs.

VIN − VOUT

101

3.5

300

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

102

103

104

105

106

3.3

3.1

2.9

2.7

2.5

2.3

2.1

1.9

1.7

1.5

1.0

200

100

−100

−200

1500

750

345

IO = 10 mA

TCASE = 25°C

IOUT = 1.5 A

(VIN − VOUT) = 3.0 V

VRIPPLE = 1.0 VPP

CAdj = 0.1 mF

VOUT = 3.3 V

COUT = CIN = 22 mF Tantalum

CAdj = 0.1 mF

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

account if precise adjustment of VOUT is necessary.

The output voltage is set according to the formula:

VOUT + VREF

R1 ) R2

) IAdj

The term IAdj × R2 represents the error added by the adjust

pin current.

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