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BIPOLAR ANALOG INTEGRATED CIRCUT

µ PC305

POSITIVE VOLTAGE STABILIZED POWER SUPPLY

Document No. G10633EJ5V0DS00 (5th edition)

Date Published October 2003 NS CP(K)

Printed in Japan

DATA SHEET

2003

The mark

shows major revised points.

DESCRIPTION

The

µ PC305 is a high-performance stabilized power supply that can supply a constant voltage in a wide temperature

range even if the input voltage or load voltage fluctuates, by integrating a high-gain error

amplifier and a

temperature-compensating constant-voltage diode on a single chip.

FEATURES

• Wide output voltage variable range: Vo = 4.5 to 30 V, VDIF = 3 to 30 V

• Excellent load stability: 0.02%

• Good ripple rejection ratio: 0.003%/V

ORDERING INFORMATION

Part Number

Package

µ PC305G2

8-pin plastic SOP (5.72 mm (225) )

EQUIVALENT CIRCUIT

3

2

1

8

7

6

5

4

GND

Reference voltage

Error detection

Compensation

Output

Current limiter

Current output

Intput

Q18

Q1

R5

2.2 k

Ω

C1

5 pF

Q2

Q3

Q17

Q16

Q5

Q15

Q14

Q9

Q7

Q8

Q10

Q13

Q12

Q11

Q4

R4

3 k

Ω

R3

6.8 k

Ω

R2

3 k

Ω

R6

4.4 k

Ω

Q6

R10

600

Ω

R8

1.86 k

Ω

R9

1.32 k

Ω

R7 2.8 k

Ω

D1

PIN CONFIGURATION (Top view)

1

2

3

4

8

7

6

5

GND

Reference voltage

Error detection

Compensation

Output

Input

Current limiter

Current output