DATA SHEET
BIPOLAR ANALOG INTEGRATED CIRCUIT
µ
PC1943,1944
ADJUSTABLE PRECISION SHUNT REGULATORS
DESCRIPTION
The
µ
PC1943,1944 are adjustable precision shunt regulators with guaranteed thermal stability. The output voltage can
be set to any value between reference voltage (1.26 V) and 24 V by two external resistors.
These ICs can apply to error amplifier of switching regulators.
FEATURES
• Low voltage operation and High accuracy.
• Adjustable output voltage by two external resistors.
• Pin compatible to
µ
PC1093.
V
REF
= 1.26 V
±
2.4 %
V
REF
≤
V
OUT
≤
24 V
ORDERING INFORMATION
Part Number
Package
Power mini mold (SOT-89)
Power mini mold (SOT-89)
3-pin plastic SIP (TO-92)
8-pin plastic SOP (5.72 mm (225))
BLOCK DIAGRAM
K
µ
PC1943T
µ
PC1944T
µ
PC1944J
µ
PC1944GR
REF
A
PIN CONFIGURATION (Marking Side)
Power mini mold (SOT-89)
µ
PC1943T
µ
PC1944T
A
A
3-pin plastic SIP (TO-92)
µ
PC1944J
3-pin plastic SOP (5.72 mm (225))
µ
PC1944GR
K 1
NC 2
8 REF
7 NC
6 A
5 NC
1
1
REF
2
A
3
K
1
K
2
A
3
REF
2
3
NC 3
NC 4
REF A
K
A: Anode
K: Cathode
REF: Reference
NC: No Connection
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. G10239EJ3V0DS00 (3rd edition)
(Previous No. IC-3454)
Date Published March 2000 NS CP (K)
Printed in Japan
The mark
shows major revised points.
©
1994, 2000
µ
PC1943,1944
ABSOLUTE MAXIMUM RATINGS (T
A
=
+
25
°
C, unless otherwise specified.)
Parameter
Cathode Voltage
Cathode Current
Cathode to Anode Reverse Current
Reference Voltage
Reference Input Current
Reference to Anode Reverse Current
Total Power Dissipation
Symbol
V
KA
I
K
−
I
K
V
REF
I
REF
−
I
REF
P
T
Ratings
25
50
−30
7
50
−
10
320 (1600
Note
)
320 (1600
Note
)
560
385
T
A
T
J
T
stg
−
30 to
+
85
−
30 to
+
125
−
65 to
+
125
Unit
V
mA
mA
V
µ
A
mA
mW
mW
mW
mW
°C
°C
°C
µ
PC1943T
µ
PC1944T
µ
PC1944J
µ
PC1944GR
Operating Ambient Temperature
Operating Junction Temperature
Storage Temperature
Note
with 16 cm
2
×
0.7 mm ceramic substrate.
Caution Product quality may suffer if the absolute maximum rating is exceeded even momentarily for any
parameter. That is the absolute maximum ratings are rated values at which the product is on the verge
of suffering physical damage, and therefore the product must be used under conditions that ensure
that the absolute maximum ratings are not exceeded.
TYPICAL CONNECTION
R
0
V
IN
R
1
REF
V
OUT
R
2
GND
A
K
(1 + R
1
) · V
REF
R
2
V
OUT
2
Data Sheet G10239EJ3V0DS00
µ
PC1943,1944
RECOMMENDED OPERATING CONDITIONS
Parameter
Cathode Voltage
Cathode Current
Total Power Dissipation
Symbol
V
KA
I
K
MIN.
V
REF
1
10
TYP.
MAX.
24
30
45 (240
Note
)
45 (240
Note
)
83
57
T
A
T
J
−30
−30
+85
+100
Unit
V
mA
mW
mW
mW
mW
°C
°C
µ
PC1943T
µ
PC1944T
µ
PC1944J
µ
PC1944GR
P
T
Operating Ambient Temperature
Operating Junction Temperature
Note
with 16 cm
2
×
0.7 mm ceramic substrate.
Caution The recommended operating range may be exceeded without causing any problems provided that the
absolute maximum ratings are not exceeded. However, if the device is operated in a way that exceeds
the recommended operating conditions, the margin between the actual conditions of use and the
absolute maximum ratings is small, and therefore thorough evaluation is necessary. The
recommended operating conditions do not imply that the device can be used with all values at their
maximum values.
ELECTRICAL CHARACTERISTICS (I
K
= 10 mA, T
A
= +25
°
C, unless otherwise specified.)
Parameter
Reference Voltage
Reference Voltage Deviation
Over Temperature
Reference Voltage Deviation
Over Cathode Voltage
Reference Input Current
Reference Input Current Deviation
Over Temperature
Minimum Cathode Current
Off-state Cathode Current
Dynamic Impedance
I
Kmin
I
Koff
| Z
KA
|
I
REF
Symbol
V
REF
V
KA
= V
REF
V
KA
= V
REF
, 0
°C ≤
T
A
≤
70
°C
| V
REF
|
≤
V
KA
≤
5V
5 V
≤
V
KA
≤
24V
V
KA
= V
REF
, R
1
= 10 kΩ, R2 =
∞
V
KA
= V
REF
, 0
°C ≤
T
A
≤
70
°C,
R
1
= 10 kΩ, R2 =
∞
V
KA
= V
REF
,
∆
V
REF
= 2 %
V
KA
= 24 V, V
REF
= 0 V
V
KA
= V
REF
, f
≤
1 kHz,
1 mA
≤
I
K
≤
30 mA
0.16
0.01
0.12
1.0
1.0
0.5
mA
2.0
0.3
Conditions
MIN.
1.23
TYP.
1.26
±
5
MAX.
1.29
±
30
Unit
V
mV
∆
V
REF
∆
V
REF
/
∆
V
KA
2.7
2.0
4.0
1.2
mV/V
mV/V
µ
A
µ
A
∆
I
REF
µ
A
Ω
Data Sheet G10239EJ3V0DS00
3
µ
PC1943,1944
TYPICAL CHARACTERISTIC (T
A
= +25
°
C, unless otherwise specified. Nominal)
P
T
vs T
A
(
I
)
600
P
T
- Total Power Dissipation - mW
µ
PC1944J
P
T
vs T
A
(
II
)
2.0
P
T
- Total Power Dissipation - W
µ
PC1943T, 1944T
with 16 cm
2
×
0.7 mm
ceramic substrate
500
µ
PC1944GR
1.5
62
400
300
200
100
µ
PC1943T,
1944T
26
0
31
0
25
50
75
100
125
150
T
A
- Operating Ambient Temperature -
°C
∆
V
REF
vs T
A
20
2.0
V
KA
= V
REF
I
K
- Cathode Current - mA
18
0
°
°
C
/
°
C
W
C/
.5
/W
°
C
1.0
W
5
/W
0.5
0
25
50
75
100
125
150
T
A
- Operating Ambient Temperature -
°C
I
K
vs V
KA
(
I
)
∆
V
REF
- Reference Voltage Deviation - mV
10
0
1.0
−10
−20
I
K
= 10 mA
V
KA
= V
REF
−40
−20
0
20 40 60 80 100 120
T
A
- Operating Ambient Temperature -
°C
0
0.2
0.4 0.6 0.8 1.0 1.2
V
KA
- Cathode Voltage - V
1.4
I
K
vs V
KA
(II)
50
V
KA
= V
REF
40
0
I
K
vs V
KA
(III)
I
K
- Cathode Current - mA
I
K
- Cathode Current - mA
−10
30
20
−20
10
0
0.5
1.0
V
KA
- Cathode Voltage - V
1.5
−30
−1.0
V
KA
= V
REF
−0.8
−0.6
−0.4
−0.2
V
KA
- Cathode Voltage - V
0
4
Data Sheet G10239EJ3V0DS00
µ
PC1943,1944
I
REF
vs T
A
4.0
0.2
I
Koff
vs T
A
I
Koff
- Off State Cathode Current -
µ
A
V
KA
= 24 V
V
REF
= 0 V
I
REF
- Reference Input Current -
µ
A
V
KA
= V
REF
, I
K
= 10 mA,
R
1
= 10 kΩ, R
2
=
∞
3.0
2.0
0.1
1.0
0
−20
0
20 40 60 80 100 120
T
A
- Operating Ambient Temperature -
°C
0
−20
0
20 40 60 80 100 120
T
A
- Operating Ambient Temperature -
°C
A
v
,
φ
vs f
60
+90
| Z
KA
| vs f
50
V
KA
= V
REF
1mA
≤
I
K
≤
30 mA
A
v
- Voltage Gain - dB
40
A
v
0
| Z
KA
| - Dynamic Impedance -
Ω
10
φ
20
220
Ω
−90
φ
- Phase -
°
1.0
0
I
K
υ
o
υ
in
10 kΩ
10 kΩ
−180
−20
1k
(I
K
= 10 mA)
10k
100k
1M
f - Frequency - Hz
−270
10M
0.1
1k
10k
100k
1M
f - Frequency - Hz
10M
Stability Area
2.0
I
KA
- Cathode Current - mA
Test Circuit
a:
150
Ω
I
KA
1.8
1.6
1.4
1.2
1.0
0.8
0.6
0.4
a: V
KA
= V
REF
b: V
KA
= 3 V
c: V
KA
= 5 V
Stable
c
C
KA
a
Stable
b, c:
b
Unstable
0.01
0.1
1
C
KA
- Lode Capacitance -
µ
F
10
150
Ω
I
KA
R
C
KA
10 kΩ
0.2
0
0.001
C
KA
: Monolithic Ceramic Capacitor
Caution of Stability Area
If the Aluminum electrolytic capacitor is used, it should be kept C
KA
≥
6.8
µ
F. When using plural different types of
capacitors, each capacitor is needed to be stable independently.
Data Sheet G10239EJ3V0DS00
5
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