NJU7261 Series
- 1 -
Ver.2003-07-18
PRELIMINARY
C-MOS STEP-UP SWITCHING REGULATOR
GENERAL DESCRIPTION
PACKAGE OUTLINE
The NJU7261 series is a C-MOS step-up switching regulator
which contains accurate voltage reference, error amplifier, CR
oscillator, control circuit, switching transistor, diode and resistor.
The stand-by function is effective for low power consumption.
The regulation voltage is fixed by internal circuits and the following
line-up of different output voltages version are available.
This series is suitable for portable equipment's or battery operated
items because of its small packaged outline, low operating voltage
and current.
FEATURES
PIN CONFIGULATION
Low Operating Voltage
(1.0V min.)
Low Operating Current
(5.0A typ. / V
OUT
= 3.0V)
Low Stand-by Current
(0.2A max. / V
OUT
= 3.0V)
High Precision Output Voltage (3% max.)
Wide Operating Voltage Range
Stand-by Function
CR Oscillator On-chip
Diode On-chip
Package
Outline
SOT89-5
C-MOS Technology
LINE-UP
EQUIVALENT CIRCUIT
Output Voltage (V)
Line-Up
3.0 NJU7261U30
3.3 NJU7261U33
4.5 NJU7261U45
5.0 NJU7261U50
TERMINAL DESCRIPTION
No. Term.
Name I/O
FUNCTION
1
CONT
I
External Inductor Connect Terminal
2
GND
POWER
Power Source (GND)
3 STB I
Strobe Terminal : "H" or OPENNormal Operation (step-up)
" L" Standp-By Operation
4 V
IN
POWER
Power Source (+)
5 V
OUT
O
Step-up
Output
Terminal
NJU7261UX
NJU7261 Series
- 2 -
Ver.2003-07-18
ABSOLUTE MAXIMUM RATINGS
(T
a
= 25C)
PARAMETER SYMBOL
RATINGS
UNIT
Input Voltage
V
IN
10 V
CONT Input Voltage
V
CONT
GND-0.3
V
CONT
10
V
Strobe Input Voltage
V
STB
GND-0.3
V
STB
V
IN
V
Output Voltage
V
OUT
GND-0.3
V
OUT
10
V
Power Dissipation
P
D
300 mW
Operating Temperature Range
T
opr
-25 to + 75
C
Storage Temperature Range
T
stg
-40 to +125
C
Note1) When a coil used. This IC of V
CONT
possible over the absolute maximum ratings. Consequently please conduct
enough to test.
Note2) The CONT input voltage (V
CONT
) should be inspected at the real application circuit, as some kinds of coils make
the CONT input voltage exceed the Absolute Maximum Rating of the V
CONT
.
ELECTRICAL CHARACTERISTICS
+3.0V Version
(T
a
= 25C)
NORM
PARAMETER SYMBOL
CONDITION
MIN. TYP. MAX.
UNIT
MEASUREMENT
CIRCUIT
Input Voltage
V
IN
-
-
5.0
V
1
Start Voltage
V
START
NO
LOAD
-
-
1.0
V
1
Oscillator Freq.
f
OSC
V
IN
= 1.5V
20
30
50
kHz
2
Output Voltage
V
OUT
V
IN
= 1.5V, I
OUT
= 20mA
2.91
3.0
3.09
V
1
Input Stability
V
OUT1
V
IN
= 1.5V to 2.0V
I
OUT
= 20mA
- 30
100
mV 1
Load Stability
V
OUT2
V
IN
= 1.5V
I
OUT
= 10A to 25mA
- 30
100
mV 1
Operating Current
I
SS
V
IN
= V
STB
= 1.5V, NO LOAD
-
5.0
10
A
3
Stand-by Current
I
Q
V
IN
= 1.5V
V
STB
= 0V, NO LOAD
- - 0.2
A 4
Switching Current
I
SI
V
DS
= 0.2V
-
250
-
mA
-
H level
V
STBH
V
IN
= 1.5V
1.0
-
-
V
5
STB Terminal
Input Voltage
L level
V
STBL
V
IN
= 1.5V
-
-
0.4
V
5
I
STBH1
V
IN
= 1.5V, V
STB
= 1.0V
-
15
30
A
6
H level
I
STBH2
V
IN
= 1.5V, V
STB
= 1.5V
-
0.1
-
A
6
I
STBL1
V
IN
= 1.5V, V
STB
= 0.4V
-
15
30
A
6
STB Terminal
Input Current
L level
I
STBL2
V
IN
= 1.5V, V
STB
= 0V
-
0.1
-
A
6
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