NJU7261 Series
C-MOS STEP-UP SWITCHING REGULATOR
■
GENERAL DESCRIPTION
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
•
Low Operating Voltage
•
Low Operating Current
•
Low Stand-by Current
•
High Precision Output Voltage
•
Wide Operating Voltage Range
•
Stand-by Function
•
CR Oscillator On-chip
•
Diode On-chip
•
Package Outline
•
C-MOS Technology
■
LINE-UP
Output Voltage (V)
3.0
3.3
4.5
5.0
Line-Up
NJU7261U30
NJU7261U33
NJU7261U45
NJU7261U50
■
PACKAGE OUTLINE
PRELIMINARY
NJU7261UX
■
PIN CONFIGULATION
(1.0V min.)
(5.0µA typ. / V
OUT
= 3.0V)
(0.2µA max. / V
OUT
= 3.0V)
(±3% max.)
SOT89-5
■
EQUIVALENT CIRCUIT
■
TERMINAL DESCRIPTION
No.
1
2
3
4
5
Term. Name
CONT
GND
STB
V
IN
V
OUT
I/O
I
POWER
I
POWER
O
FUNCTION
External Inductor Connect Terminal
Power Source (GND)
Strobe Terminal : "H" or OPEN···Normal Operation (step-up)
" L"
···Standp-By Operation
Power Source (+)
Step-up Output Terminal
Ver.2003-07-18
-1-
NJU7261 Series
■
ABSOLUTE MAXIMUM RATINGS
PARAMETER
Input Voltage
CONT Input Voltage
Strobe Input Voltage
Output Voltage
Power Dissipation
Operating Temperature Range
Storage Temperature Range
SYMBOL
V
IN
V
CONT
V
STB
V
OUT
P
D
T
opr
T
stg
RATINGS
10
GND-0.3
≤
V
CONT
≤
10
GND-0.3
≤
V
STB
≤
V
IN
GND-0.3
≤
V
OUT
≤
10
300
-25 to + 75
-40 to +125
(T
a
= 25ºC)
UNIT
V
V
V
V
mW
ºC
ºC
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
PARAMETER
Input Voltage
Start Voltage
Oscillator Freq.
Output Voltage
Input Stability
Load Stability
Operating Current
Stand-by Current
Switching Current
STB Terminal
Input Voltage
H level
L level
H level
L level
SYMBOL
V
IN
V
START
f
OSC
V
OUT
∆V
OUT1
∆V
OUT2
I
SS
I
Q
I
SI
V
STBH
V
STBL
I
STBH1
I
STBH2
I
STBL1
I
STBL2
NO LOAD
V
IN
= 1.5V
V
IN
= 1.5V, I
OUT
= 20mA
V
IN
= 1.5V to 2.0V
I
OUT
= 20mA
V
IN
= 1.5V
I
OUT
= 10µA to 25mA
V
IN
= V
STB
= 1.5V, NO LOAD
V
IN
= 1.5V
V
STB
= 0V, NO LOAD
V
DS
= 0.2V
V
IN
= 1.5V
V
IN
= 1.5V
V
IN
= 1.5V, V
STB
= 1.0V
V
IN
= 1.5V, V
STB
= 1.5V
V
IN
= 1.5V, V
STB
= 0.4V
V
IN
= 1.5V, V
STB
= 0V
CONDITION
NORM
MIN.
-
-
20
2.91
-
-
-
-
-
1.0
-
-
-
-
-
TYP.
-
-
30
3.0
30
30
5.0
-
250
-
-
15
0.1
15
0.1
MAX.
5.0
1.0
50
3.09
100
100
10
0.2
-
-
0.4
30
-
30
-
UNIT
V
V
kHz
V
mV
mV
µA
µA
mA
V
V
µA
µA
µA
µA
(T
a
= 25°C)
MEASUREMENT
CIRCUIT
1
1
2
1
1
1
3
4
-
5
5
6
6
6
6
STB Terminal
Input Current
-2-
Ver.2003-07-18
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