DATA SHEET
BIPOLAR ANALOG INTEGRATED CIRCUIT
µ
PC2918,2925,2926
THREE-TERMINAL LOW DROPOUT VOLTAGE REGULATOR
#
DESCRIPTION
The
µ
PC2918, 2925 and 2926 are three-terminal low dropout voltage regulators with the 1-A output. The
µ
PC2918
outputs 1.8 V, the
µ
PC2925 outputs 2.5 V and the
µ
PC2926 outputs 2.6 V. Since these regulators use a PNP
transistor for the output stage, they achieve a low dropout voltage of 0.7 V TYP. at I
O
= 1 A and minimize the power
dissipation of the IC. As a result, these regulators can be used to realize sets with lower voltage and power
dissipation.
FEATURES
•
Output current capacity: 1 A
•
Low dropout voltage (V
DIF
= 0.5 V MAX. (at I
O
= 0.5 A))
•
Output voltage accuracy:
±2%
•
On-chip saturation protector rising edge of input voltage
(at low input voltage)
•
On-chip overcurrent limiter and thermal protection
•
On-chip output transistor safe operation area protection
PIN CONFIGURATION (Marking Side)
4
1: INPUT
2: GND
3: OUTPUT
4: GND (Fin)
1
2
3
BLOCK DIAGRAM
INPUT
Reference voltage
circuit
Startup circuit
Thermal shut down
Saturation protection
Error
Amp.
Drive circuit
Safe operation
area protection
OUTPUT
Overcurrent
protection
GND
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. G14983EJ3V0DS00 (3rd edition)
Date Published May 2001 NS CP(K)
Printed in Japan
The mark
#
shows major revised points.
©
2000,2001
µ
PC2918, 2925, 2926
#
ORDERING INFORMATION
Part Number
Package
MP-3Z (SC-63)
MP-3Z (SC-63)
Marking
29xx
29xx
•
Bag stuffing
•
Embossed-type taping (16mm tape)
•
Pin 1 on drawout side
•
2000 pcs/reel
Packing Type
µ
PC29xxT
µ
PC29xxT-E1
µ
PC29xxT-E2
MP-3Z (SC-63)
29xx
•
Embossed-type taping (16mm tape)
•
Pin 1 at takeup side
•
2000 pcs/reel
µ
PC29xxT-T1
MP-3Z (SC-63)
29xx
•
Adhesive-type taping (32mm tape)
•
Pin 1 on drawout side
•
1500 pcs/reel
µ
PC29xxT-T2
MP-3Z (SC-63)
29xx
•
Adhesive-type taping (32mm tape)
•
Pin 1 at takeup side
•
1500 pcs/reel
µ
PC29xxHB
MP-3 (SC-64)
29xx
•
Bag stuffing
”xx” mark of the part number and marking columns expresses output voltage.
Example
Output Voltage
Part Number
Marking
1.8V
2.5V
2.6V
µ
PC2918T
µ
PC2925T
µ
PC2926T
2918
2925
2926
2
Data Sheet G14983EJ3V0DS
µ
PC2918, 2925, 2926
ABSOLUTE MAXIMUM RATINGS
(T
A
= 25°C unless otherwise specified)
Parameter
Input Voltage
Internal Power Dissipation (T
C
= 25°C)
Operating Ambient Temperature
Operating Junction Temperature
Storage Temperature
Thermal Resistance (junction to case)
Thermal Resistance (junction to ambient)
Symbol
V
IN
P
T
T
A
T
J
T
stg
R
th(J-C)
R
th(J-A)
Rating
–0.3 to +20
10
Note
–30 to +85
–30 to +150
–55 to +150
12.5
125
Unit
V
W
°C
°C
°C
°C/W
°C/W
Note
Internally limited. When the operating junction temperature rises over 150°C, the internal circuit shuts down the
output voltage.
Caution If the absolute maximum rating of any of the above parameters is exceeded even momentarily, the
quality of the product may be degraded. In other words, absolute maximum ratings specify the
values exceeding which the product may be physically damaged. Be sure to use the product with
these ratings never exceeded.
#
TYPICAL CONNECTION
D
1
INPUT
C
IN
µ
PC2918, 2925, 2926
+
OUTPUT
C
OUT
D
2
C
IN
: 0.1
µ
F or higher. Set this value according to the length of the line between the regulator and INPUT pin. Be sure
to connect C
IN
to prevent parasitic oscillation. Use of a film capacitor or other capacitor with excellent voltage and
temperature characteristics is recommended. If using a laminated ceramic capacitor, it is necessary to ensure
that C
IN
is 0.1
µ
F or higher for the voltage and temperature range to be used.
C
OUT
: 10
µ
F or higher. Be sure to connect C
OUT
to prevent oscillation and improve excessive load regulation. Place
C
IN
and C
OUT
as close as possible to the IC pins (within 2 cm). Also, use an electrolytic capacitor with low
impedance characteristics if considering use at sub-zero temperatures.
D
1
: If the OUTPUT pin has a higher voltage than the INPUT pin, connect a diode.
D
2
: If the OUTPUT pin has a lower voltage than the GND pin, connect a Schottky barrier diode.
Caution Make sure that no voltage is applied to the OUTPUT pin from external.
Data Sheet G14983EJ3V0DS
3
µ
PC2918, 2925, 2926
RECOMMENDED OPERATING CONDITIONS
Parameter
Input Voltage
Symbol
V
IN
Type Number
MIN.
2.8
3.5
3.6
0
−
30
−
30
TYP.
MAX.
16
16
16
1
+
85
+
125
Unit
V
V
V
A
°C
°C
µ
PC2918
µ
PC2925
#
Output Current
I
O
Operating Ambient Temperature T
A
Operating Junction Temperature T
J
µ
PC2926
All
All
All
Caution Use of conditions other than the above-listed recommended operating conditions is not a problem
as long as the absolute maximum ratings are not exceeded. However, since the use of such
conditions diminishes the margin of safety, careful evaluation is required before such conditions
are used. Moreover, using the MAX. value for all the recommended operating conditions is not
guaranteed to be safe.
ELECTRICAL CHARACTERISTICS
°
µ
PC2918 (T
J
= 25°C, V
IN
= 2.8 V, I
O
= 0.5 A, C
IN
= 0.1
µ
F, C
OUT
= 10
µ
F, unless otherwise specified)
Parameter
Output Voltage
Symbol
V
O
2.8 V
≤
V
IN
≤
5 V, 0 A
≤
I
O
≤
1 A,
0°C
≤
T
J
≤
125°C
Line Regulation
Load Regulation
Quiescent Current
Startup Quiescent Current
Quiescent Current Change
Output Noise Voltage
Ripple Rejection
Dropout Voltage
Short Circuit Current
Peak Output Current
Temperature Coefficient of
Output Voltage
REG
IN
REG
L
I
BIAS
I
BIAS (s)
2.8 V
≤
V
IN
≤
16 V
0 A
≤
I
O
≤
1 A
I
O
= 0 A
I
O
= 1 A
V
IN
= 2.4 V, I
O
= 0 A
V
IN
= 2.4 V, I
O
= 1 A
2.8 V
≤
V
IN
≤
16 V, 0°C
≤
T
J
≤
125°C
10 Hz
≤
f
≤
100 kHz
f = 120 Hz, 2.8 V
≤
V
IN
≤
9 V
I
O
= 0.5 A
I
O
= 1 A, 0°C
≤
T
J
≤
125°C
I
Oshort
I
Opeak
V
IN
= 2.8 V
V
IN
= 16 V
V
IN
= 2.8 V
V
IN
= 16 V
I
O
= 5 mA, 0°C
≤
T
J
≤
125°C
1.0
1.2
45
Conditions
MIN.
1.764
(1.71)
6
7
2
20
10
2.9
40
60
0.25
0.7
1.7
1.2
1.5
1.1
−
0.4
3.0
3.0
0.5
TYP.
1.8
MAX.
1.836
(1.854)
25
30
4
60
30
80
20
Unit
V
V
mV
mV
mA
mA
mA
mA
mA
∆
I
BIAS
V
n
R•R
V
DIF
µ
V
r.m.s.
dB
V
V
A
A
A
A
mV/°C
∆
V
O
/
∆
T
Remark
Values in parentheses have been measured during product design and are provided as reference values.
4
Data Sheet G14983EJ3V0DS
µ
PC2918, 2925, 2926
°
µ
PC2925 (T
J
= 25°C, V
IN
= 3.5 V, I
O
= 0.5 A, C
IN
= 0.1
µ
F, C
OUT
= 10
µ
F, unless otherwise specified)
Parameter
Output Voltage
Symbol
V
O
3.5 V
≤
V
IN
≤
5 V, 0 A
≤
I
O
≤
1 A,
0°C
≤
T
J
≤
125°C
Line Regulation
Load Regulation
Quiescent Current
Startup Quiescent Current
Quiescent Current Change
Output Noise Voltage
Ripple Rejection
Dropout Voltage
Short Circuit Current
Peak Output Current
Temperature Coefficient of
Output Voltage
REG
IN
REG
L
I
BIAS
I
BIAS (s)
3.5 V
≤
V
IN
≤
16 V
0 A
≤
I
O
≤
1 A
I
O
= 0 A
I
O
= 1 A
V
IN
= 2.4 V, I
O
= 0 A
V
IN
= 3.0 V, I
O
= 1 A
3.5 V
≤
V
IN
≤
16 V, 0°C
≤
T
J
≤
125°C
10 Hz
≤
f
≤
100 kHz
f = 120 Hz, 3.5 V
≤
V
IN
≤
9 V
I
O
= 0.5 A
I
O
= 1 A, 0°C
≤
T
J
≤
125°C
I
Oshort
I
Opeak
V
IN
= 3.5 V
V
IN
= 16 V
V
IN
= 3.5 V
V
IN
= 16 V
I
O
= 5 mA, 0°C
≤
T
J
≤
125°C
1.0
1.2
45
Conditions
MIN.
2.45
(2.375)
6
7
2
20
10
2.9
40
60
0.25
0.7
1.7
1.2
1.5
1.1
−
0.5
3.0
3.0
0.5
TYP.
2.5
MAX.
2.55
(2.575)
25
30
4
60
30
80
20
Unit
V
V
mV
mV
mA
mA
mA
mA
mA
∆
I
BIAS
V
n
R•R
V
DIF
µ
V
r.m.s.
dB
V
V
A
A
A
A
mV/°C
∆
V
O
/
∆
T
Remark
Values in parentheses have been measured during product design and are provided as reference values.
#
µ
PC2926 (T
J
= 25°C, V
IN
= 3.6 V, I
O
= 0.5 A, C
IN
= 0.1
µ
F, C
OUT
= 10
µ
F, unless otherwise specified)
°
Parameter
Output Voltage
Symbol
V
O
3.6 V
≤
V
IN
≤
5 V, 0 A
≤
I
O
≤
1 A,
0°C
≤
T
J
≤
125°C
Line Regulation
Load Regulation
Quiescent Current
Startup Quiescent Current
Quiescent Current Change
Output Noise Voltage
Ripple Rejection
Dropout Voltage
Short Circuit Current
Peak Output Current
Temperature Coefficient of
Output Voltage
REG
IN
REG
L
I
BIAS
I
BIAS (s)
3.6 V
≤
V
IN
≤
16 V
0 A
≤
I
O
≤
1 A
I
O
= 0 A
I
O
= 1 A
V
IN
= 2.4 V, I
O
= 0 A
V
IN
= 3.0 V, I
O
= 1 A
3.6 V
≤
V
IN
≤
16 V, 0°C
≤
T
J
≤
125°C
10 Hz
≤
f
≤
100 kHz
f = 120 Hz, 3.6 V
≤
V
IN
≤
9 V
I
O
= 0.5 A
I
O
= 1 A, 0°C
≤
T
J
≤
125°C
I
Oshort
I
Opeak
V
IN
= 3.6 V
V
IN
= 16 V
V
IN
= 3. 6 V
V
IN
= 16 V
I
O
= 5 mA, 0°C
≤
T
J
≤
125°C
1.0
1.2
45
Conditions
MIN.
2.548
(2.470)
6
7
2
20
10
2.9
40
60
0.25
0.7
1.7
1.2
1.5
1.1
−
0.5
3.0
3.0
0.5
TYP.
2.6
MAX.
2.652
(2.678)
25
30
4
60
30
80
20
Unit
V
V
mV
mV
mA
mA
mA
mA
mA
∆
I
BIAS
V
n
R•R
V
DIF
µ
V
r.m.s.
dB
V
V
A
A
A
A
mV/°C
∆
V
O
/
∆
T
Remark
Values in parentheses have been measured during product design and are provided as reference values.
Data Sheet G14983EJ3V0DS
5
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