DATA SHEET
BIPOLAR ANALOG INTEGRATED CIRCUT
µ
PC305
POSITIVE VOLTAGE STABILIZED POWER SUPPLY
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, V
DIF
: 3 to 30 V
•
Excellent load stability
•
Good ripple rejection ratio
0.02%
0.003%/V
PIN CONFIGURATION (Top View)
µ
PC305C, 305G2
Current limiter 1
Current output 2
Input 3
GND 4
8 Output
7 Compensation
6 Error detection
5 Reference voltage
ORDERING INFORMATION
Part Number
Package
8-pin plastic DIP (7.62 mm (300))
8-pin plastic SOP (5.72 mm (225))
µ
PC305C
µ
PC305G2
EQUIVALENT CIRCUIT
R
7
2.8 kΩ
Q
12
Q
11
Q
10
Q
9
Q
7
Q
8
D
1
R
4
3 kΩ
R
3
6.8 kΩ
Q
18
R
2
3 kΩ
Q
1
Q
2
C
1
5 pF
Q
3
Q
6
R
6
4.4 kΩ
Q
5
Q
13
R
8
1.86 kΩ
Q
16
Q
14
Q
15
R
9
1.32 kΩ
1
8
7
Current limiter
Output
Compensation
3
R
10
600
Ω
2
Current output
Input
Q
4
Q
17
6
5
R
5
2.2 kΩ
4
GND
Error detection
Reference voltage
The information in this document is subject to change without notice. Before using this document, please
confirm that this is the latest version.
Not all devices/types available in every country. Please check with local NEC representative for
availability and additional information.
Document No. G10633EJ3V0DS00 (3rd edition)
Date Published December 1999 N CP(K)
Printed in Japan
©
1999
µ
PC305
ABSOLUTE MAXIMUM RATINGS (Unless otherwise specified, T
A
= 25°C)
°
Parameter
Input Voltage
Input
−
Output Voltage Difference
Maximum Output Current
Total Loss
Operating Temperature
Storage Temperature
Symbol
V
IN
V
DIF
I
O
P
T
T
A
T
stg
350
Note 1
µ
PC305C
−0.3
to +40
40
50
µ
PC305G2
Unit
V
V
mA
440
0 to +70
−55
to +125
Note 2
mW
°C
°C
Notes 1.
Where T
A
> +55°C, perform derating at T
J
MAX. 125°C,
−5
mW/°C.
2.
Where T
A
> +25°C, perform derating at T
J
MAX. 125°C,
−4.4
mW/°C.
Caution If any of the parameters exceeds the absolute maximum ratings, even momentarily, the quality of
the product may be impaired.
The absolute maximum ratings are values that may physically
damage the product(s). Be sure to use the product(s) within the ratings.
ELECTRICAL SPECIFICATIONS (Unless otherwise specified, T
A
= 25°C)
°
Parameter
Input Voltage Range
Output Voltage Range
Input
−
Output Voltage Difference
Load Stability
Input Stability
Symbol
V
IN
V
OUT
V
DIF
REG
L
REG
IN
0
≤
I
O
≤
12 mA, R
SC
= 18
Ω
V
IN
– V
OUT
≤
5 V
V
IN
– V
OUT
> 5 V
Ripple Rejection Ratio
Temperature Stability
Reference Voltage
Output Noise Voltage
V
REF
V
N
10 Hz
≤
f
≤
10 kHz, C
REF
= 0
µ
F
C
REF
= 0.1
µ
F
Long-time Stability
Supply Current under No Load
I
CC
V
IN
= 40 V
REJ
C
REF
= 10
µ
F, f = 120 Hz
0°C
≤
T
A
≤
70°C
1.65
Condition
MIN.
8.0
4.5
3.0
0.02
0.025
0.015
0.003
0.3
1.8
0.005
0.002
0.1
1.0
2.0
1.0
1.90
TYP.
MAX.
40
30
30
0.05
0.06
0.03
Unit
V
V
V
%
%/V
%/V
%/V
%
V
%
%
%
mA
Remark
R
SC
: Current-limiting resistor
C
REF
: Bypass capacitor of reference voltage pin
2
Data Sheet G10633EJ3V0DS00
µ
PC305
STANDARD CHARACTERISTIC CURVES
(Unless otherwise specified, T
A
= 25°C. Reference values)
°
P
T
vs T
A
Characteristics
500
Load Stability (1)
µ
PC305G
0
400
µ
PC305C
Output Voltage Fluctuation (%)
Total Loss P
T
[mW]
T
A
=
+70°C
−0.01
T
A
= 0°C
−0.02
300
200
T
A
=
−20°C
100
−0.03
R
SC
= 0
Ω
0
0
20
40
60
80
100
Operating Temperature T
A
[°C]
Load Stability (2)
−0.04
0
5
10
15
Output Current I
O
(mA)
Current-limiting Characteristics
0
100
Outout Voltage Fluctuation (%)
Output Voltage Drop Ratio (%)
T
A
= 0°C
−0.02
T
A
= 25°C
−0.04
T
A
=
+70°C
T
A
=
+70°C
T
A
= 0°C
80
T
A
= 25°C
60
T
A
=
−20°C
40
−0.06
−0.08
T
A
=
−20°C
R
SC
= 13
Ω
20
R
SC
= 13
Ω
−0.1
0
10
20
30
40
0
0
10
20
30
40
50
Output Current I
O
(mA)
Resistance for Setting Output Voltage
R
1
//R
2
= 2 kΩ
3.0
Output Current I
O
(mA)
Current-limiting Pickup Voltage
Pickup Voltage Across Pins <1> and <8> (V)
3.2
0.6
0.5
R
2
Resistance (kΩ)
2.8
2.6
R
1
= 1110×V
OUT
(Ω)
2.4
R
2
2.2
0.4
0.3
2.0
5
10
20
50
0.2
0
20
40
60
80
Output Voltage (V)
Operating Temperature T
A
(°C)
Data Sheet G10633EJ3V0DS00
3
µ
PC305
Line Regulation
0.1
Output Voltage Fuctuation Ratio (%)
Transient Response Time
40
V
OUT
= 10 V
T
A
= 25°C
LINE
0
V
OUT
= 10 V
−40
C
L
= 0
400
C
L
= 1
µ
F
LOAD
R
SC
= 10
Ω
∆V
IN
= 5 V
0.02
C
ref
= 0
µ
F
0.01
0.005
C
ref
= 10
µ
F
f≤120 Hz
Output Voltage Fluctuation (mV)
0.05
R
SC
= 10
Ω
I
FL
= 20 mA
I
NL
= 1.0 mA
V
OUT
= 10 V
0
0.002
0.001
1
2
5
10
20
50
−400
0
10
20
30
Input - Output Voltage Difference V
DIF
(V)
Response Time (
µ
s)
APPLICATION CIRCUIT EXAMPLES
5 V-15 mA Regulator
R
3
13
Ω
8
1
10 V-200 mA Regulator (Drooping Characteristics)
R
3
1.3
Ω
0.5 W
8
1
C
1
47 pF
7
C
1
47 pF
7
R
1
5.6 kΩ
11.2 kΩ
V
O
= 5 V
V
O
= 10 V
R
1
+
−
C
2
3.3
µ
F
R
2
2
6
V
IN
≥
8 V
3
5
4
C
3
0.01
µ
F
3.1 kΩ R
2
C
REF
10
µ
F
V
IN
≥
13 V
3
5
4
C
3
0.01
µ
F
C
REF
10
µ
F
15 V-1A Regulator (Fold-back Characteristics)
R
3
1.3
Ω
2 W
+
C
4
−
1
µ
F
2SD297
R
6
R
3
110
Ω
130
Ω
1
2
8
1A Constant-current Regulator
V
IN
2SD79
680
Ω
R
4
2SD73
C
1
R
3
47 pF R
2
68
Ω
2 kΩ
R
1
1.8
Ω
2W
Load
V
O
= 15 V
7
6
C
1
47 pF
2SB505
V
IN
≥
19 V
C
3
0.1
µ
F
3
5
4
R
5
1.2 kΩ
C
REF
10
µ
F
R
1
16.7
kΩ
+
−
C
2
50
µ
F
R
2
2.3
kΩ
8
1
7
2
6
5
4
3
Caution Note the power consumption of the
µ
PC305 when the output pin is short-circuited and that of the
external transistor.
4
Data Sheet G10633EJ3V0DS00
2.45 kΩ
+
−
C
2
1
µ
F
2SB505
2
6
µ
PC305
PACKAGE DRAWINGS
8-PIN PLASTIC DIP (7.62mm(300))
8
5
1
A
4
K
J
I
P
L
H
G
F
D
N
M
C
B
M
R
NOTES
1. Each lead centerline is located within 0.25 mm of
its true position (T.P.) at maximum material condition.
2. ltem "K" to center of leads when formed parallel.
ITEM
A
B
C
D
F
G
H
I
J
K
L
M
N
P
R
MILLIMETERS
10.16 MAX.
1.27 MAX.
2.54 (T.P.)
0.50±0.10
1.4 MIN.
3.2±0.3
0.51 MIN.
4.31 MAX.
5.08 MAX.
7.62 (T.P.)
6.4
0.25
+0.10
−0.05
0.25
0.9 MIN.
0∼15°
P8C-100-300B,C-2
Data Sheet G10633EJ3V0DS00
5
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