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2000,2001
BIPOLAR ANALOG INTEGRATED CIRCUIT
µ
µµ
µ
PC2918,2925,2926
THREE-TERMINAL LOW DROPOUT VOLTAGE REGULATOR
DATA SHEET
Document No. G14983EJ3V0DS00 (3rd edition)
Date Published May 2001 NS CP(K)
Printed in Japan
The mark ★ shows major revised points.
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.
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
BLOCK DIAGRAM
Startup circuit
GND
OUTPUT
INPUT
Safe operation
area protection
Error
Amp.
Reference voltage
circuit
Thermal shut down
Drive circuit
Saturation protection
Overcurrent
protection
PIN CONFIGURATION (Marking Side)
1
1: INPUT
2: GND
3: OUTPUT
4: GND (Fin)
23
4
★
