NJU7606
,
NJU7608
-1-
Ver.2006-02-13
Step-Up / Flyback Switching Regulator IC with Load Switch Function
■GENERAL DESCRIPTION ■PACKAGE OUTLINE
■FEATURES ■PRODUCT VARIATION
● PWM switching control
● Load Switch Function
● Operating Voltage 2.2V to 8V
● Wide Oscillator Range 300kHz to 1MHz
● Maximum Duty Cycle 90% typ.
● Quiescent Current Operating: 800µA typ.
Standby: 1µA max.
● Soft-Start Function Internal : 16ms typ. or adjustable
● Dead Time Control
● Timer Latch for Short Circuit Protection
● C-MOS Technology
● Package Outline NJU7606RB2 : TVSP10
NJU7608PB1 : FFP12 -B1
■PIN CONFIGURATION
NJU7606/08 is a high speed low voltage operation switching
regulator control IC with load switch function.
It features a which disconnects load from input during standby and
also provides latch mode.
NJU7606RB2
NJU7608PB1
NJU7606
NJU7608
NJU7606 small PKG
NJU7602
Load SW,
Standby Function
Standby Function
NJU7606RB2
1 10
2 9
3 8
4 7
5 6
PIN FUNCTION
1. V
+
2. LSW
3. FB
4. IN-
5. SCP
6. ON/OFF
7. DTC
8. RT
9. GND
10. OUT
NJU7608PB1
PIN FUNCTION
1. GND
2. RT
3. DTC
4. ON/OFF
5. SCP
6. IN-
7. FB
8. LSW
9. V
+
10. N.C.
11. OUT
12. N.C.
TOP　
　　
　　　　
　　　　　　
　　　 　　　
　　　　　　
　　　UNDER
123
4
5
6
789
10
11
12
321
12
9
8
7
6
5
4
11
10
TOP　
　　
　　　　
　　　　　　
　　　 　　　
　　　　　　
　　　UNDER
123
4
5
6
789
10
11
12
321
12
9
8
7
6
5
4
11
10
123
4
5
6
789
10
11
12
321
12
9
8
7
6
5
4
11
10
NJU7606
,
NJU7608
- 2 -
Ver.2006-02-13
■BLOCK DIAGRAM
Buffer
0.74V
0.5V
OSC
1V
0.5
R
T
A
2kΩ
2
µ
A
UVLO
Soft Start
Vref
1V
1V
0.8V
0.2V
OUT
GND RT DTC
R
T
SCP
IN-
FB
V
+
PWM
SCP
ER⋅AMP
Latch
Standby
ON/OFF
ON/OFF
High: ON
Low : OFF (Standby)
LSW
NJU7606
,
NJU7608
-
3
-
Ver.2006-02-13
■ABSOLUTE MAXIMUM RATINGS (Ta=25°C)
PARAMETER SYMBOL MAXIMUM RATINGS UNIT
Supply Voltage V
+
+9 V
LSW Output Voltage V
LSW
+9 V
Output Pin Current I
O
±50 mA
LSW Output Current I
LSW
-10 mA
ON/OFF Pin Voltage V
ON/OFF
+9 (*1) V
Power Dissipation P
D
TVSP10 :320
FFP12-B1 :300 (*2) mW
Operating Temperature Range T
OPR
-40 ~ +85 °C
Storage Temperature Range T
STG
-40 ~ +125 °C
*1: When input voltage is less than 9V, the absolute maximum control voltage is equal to the input voltage.
*2: On board. 25mm×25mm×0.2mm
■RECOMMENDED OPERATING CONDITIONS (Ta=25°C)
PARAMETER SYMBOL MIN. TYP. MAX. UNIT
Operating Voltage V
+
2.2 – 8 V
Oscillator Timing Resistor R
T
30 47 120 kΩ
Oscillation Frequency f
OSC
300 700 1,000 kHz
■ELECTRICAL CHARACTERISTICS (V
+
=V
ON/OFF
=3.3V, R
T
=47kΩ, Ta=25°C)
PARAMETER SYMBOL TEST CONDITION MIN. TYP. MAX. UNIT
Under Voltage Lockout Block
ON Threshold Voltage V
T_ON
V
+
= L → H 1.9 2.0 2.1 V
OFF Threshold Voltage V
T_OFF
V
+
= H → L 1.8 1.9 2.0 V
Hysteresis Voltage V
HYS
60 100 – mV
Soft Start Block
Soft Start Time T
SS
V
T_ON
→ Duty=80% 8 16 24 ms
Short Circuit Protection Block
Input Threshold Voltage V
T_PC
FB Pin 0.95 1.00 1.05 V
Charge Current I
CHG
V
SCP
=0V 1.5 2 2.5
µA
Latch Mode
ON Threshold Voltage V
T_LA
SCP Pin 0.95 1.00 1.05 V
Latch Mode
OFF Threshold Voltage V
T_LAOFF
SCP Pin 0.2 0.45 0.7 V
Oscillator Block
RT Pin Voltage V
RT
-5% 0.5 +5% V
Oscillation Frequency f
OSC
630 700 770 kHz
Oscillate Supply Voltage
Fluctuations f
DV
V
+
=2.2V ~ 8V – 1 – %
Oscillate Temperature
Fluctuations f
DT
Ta = -4 0 °C ~ +85°C – 3 – %
NJU7606
,
NJU7608
- 4 -
Ver.2006-02-13
■ELECTRICAL CHARACTERISTICS (V
+
=V
ON/OFF
=3.3V, R
T
=47kΩ, Ta=25°C)
PARAMETER SYMBOL TEST CONDITION MIN. TYP. MAX. UNIT
Error Amplifier Block
Reference Voltage V
B
-1.5% 1.00 +1.5% V
Input Bias Current I
B
-0.1 – 0.1
µA
Open Loop Gain A
V
– 80 – dB
Gain Bandwidth Product G
B
– 1 – MHz
I
OM+_1
V
FB
=1V, V
IN-
=0.9V 20 45 70 mA
Output Source Current I
OM+_2
V
FB
=1V, V
IN-
=0.9V, V
+
=2.2V 4 9 16 mA
Output Sink Current I
OM-
V
FB
=1V, V
IN-
=1.1V 0.10 0.16 0.22 mA
PWM Comparate Block
V
T_0
Duty=0% 0.16 0.22 0.28 V
Input Threshold Voltage V
T_50
Duty=50% 0.44 0.5 0.56 V
M
AX
D
UTY_1
V
FB
=0.9V 85 90 95 %
Maximum Duty Cycle M
AX
D
UTY_2
V
FB
=0.9V, R
DTC
=47kΩ 40 50 60 %
Output Block
Output High Level
ON Resistance R
OH
I
O
=-20mA – 10 20 Ω
Output Low Level
ON Resistance R
OL
I
O
=+20mA – 5 10 Ω
Load SW Output Block
LSW Output ON Resistance R
LSW
I
LSW
=1mA – 55 100 Ω
LSW Output Leak Current I
LEAK_LSW
V
LSW
=9V, V
ON/OFF
=0V – – 0.1
µA
ON/OFF Block
ON Control Voltage V
ON
V
ON/OFF
= L → H 1.6 – V
+
V
OFF Control Voltage V
OFF
V
ON/OFF
= H → L 0 – 0.3 V
General Characteristics
Quiescent Current I
DD
R
L
=Non Load – 800 1200 µA
Standby Current I
DD_STB
V
ON/OFF
=0V – – 1.0
µA
NJU7606
,
NJU7608
-
5
-
Ver.2006-02-13
■ TYPICAL APPLICATIONS
Step-Up Converter (Input Line Load SW)
SCP
V
+
V
OUT
SBD
IN-
FB
V
+
DTC
RT
GND
OUT
GND
LSW
ON/OFF
FET:
Load SW
NJU7606
NJU7608
ON/OFF
High : ON
Low : OFF (Standby)
C
SCP
C
IN
FET
R2
R1
C
OUT
L
C
NF
R
NF
R
DTC
C
S
C
R
T
R
P
Step-Up Converter (Onput Line Load SW)
SCP
V
+
V
OUT
SBD
IN-
FB
V
+
DTC
RT
GND
OUT
GND
LSW
ON/OFF
FET: Load SW
NJU7606
NJU7608
ON/OFF
High : ON
Low : OFF (Standby)
C
SCP
C
IN
FET
R2
R1
C
OUT
L
C
NF
R
NF
R
DTC
C
S
C
R
T
R
P
NJU7606
,
NJU7608
-
6
-
Ver.2006-02-13
■TYPICAL CHARACTERISTICS
100
1000
10 100
Oscillation Frequency f
OSC
(kHz)
Oscillation Frequency vs. Timing Resistance
(V
+
=3.3V, Ta=25
o
C)
Timing Resistance R
T
(kΩ)
80
85
90
95
100
100 1000
Maximum Duty Cycle
M
AX
D
UTY_1
(%)
Maximum Duty Cycle vs. Oscillator Frequency
(V
+
=3.3V, Ta=25
o
C)
Oscillator Frequency f
OSC
(kHz)
660
680
700
720
740
0246810
Oscillation Frequency fosc (kHz)
Operating Voltage V
+
(V)
Oscillation Frequency vs. Operating Voltage
(R
T
=47kΩ, Ta=25
o
C)
0
20
40
60
80
100
0 20406080100
Duty Cycle M
AX
D
UTY
(%)
Dead Time Control Resistance R
DTC
(kΩ)
Duty Cycle vs. R
DTC
(V
+
=3.3V, R
T
=47kΩ, Ta=25
o
C)
0.996
0.998
1
1.002
1.004
0246810
Reference Voltage V
B
(V)
Operating Voltage V
+
(V)
Reference Voltage vs. Operating Voltage
(Ta=25
o
C)
(V
+
=3.3V, Gain=40dB, Ta=25
o
C)
0
15
30
45
60
0
45
90
135
180
0.1 1 10 100 1000 10000
Error Amplifier Block
Voltage Gain, Phase vs. Frequency
Phase Φ (deg)
Frequency f (kHz)
Voltage Gain Av (dB)
Phase
Gain
NJU7606
,
NJU7608
-7-
Ver.2006-02-13
■TYPICAL CHARACTERISTICS
0
200
400
600
800
1000
1200
1400
0246810
Quiescent Current I
DD
(µA)
Operating Voltage V
+
(V)
Quiescent Current vs. Operating Voltage
(R
T
=47kΩ, R
L
=Non Load, Ta=25
o
C)
0
0.2
0.4
0.6
0.8
1
0246810
Standby Current I
DD_STB
(nA)
Operating Voltage V
+
(V)
Standby Current vs. Operating Voltage
(R
T
=47kΩ, V
ON/OFF
=0V, Ta=25
o
C)
0
2
4
6
8
10
12
14
16
-50 -25 0 25 50 75 100 125
Ambient Temperature
Ta (
o
C)
Output High Level ON Resistance
R
OH
(Ω)
Output Block
Output High Level ON Resistance
vs. Temperature (Io=-20mA)
V
+
=3.3V
V
+
=1.95V
V
+
=8V
0
2
4
6
8
10
12
14
-50 -25 0 25 50 75 100 125
Ambient Temperature
Ta (
o
C)
Output Low Level ON Resistance
R
OL
(Ω)
Output Block
Output Low Level ON Resistance
vs. Temperature (Io=+20mA)
V
+
=3.3V
V
+
=1.95V
V
+
=8V
1
10
100
1000
-50 -25 0 25 50 75 100 125
Ambient Temperature
Ta (oC)
Output Source Current I
OM+ (mA)
Error Amplifier Block
Output Source Current vs. Temperature
(VFB=1V, VIN-=0.9V)
V+=3.3V
V+=1.95V
V+=8V
0
0.05
0.1
0.15
0.2
-50 -25 0 25 50 75 100 125
Ambient Temperature
Ta (oC)
Output Sink Current IOM- (mA)
Error Amplifier Block
Output Sink Current vs. Temperature
(VFB=1V, VIN-=1.1V)
V+=1.95V, 3.3V, 8V
NJU7606
,
NJU7608
-
8
-
Ver.2006-02-13
■TYPICAL CHARACTERISTICS
8
10
12
14
16
18
20
22
24
-50 -25 0 25 50 75 100 125
Ambient Temperature
Ta (
o
C)
Soft Start Time Tss (ms)
Soft Start Time vs. Temperature
(V
+
=3.3V)
0.99
0.995
1
1.005
1.01
-50 -25 0 25 50 75 100 125
Ambient Temperature
Ta (
o
C)
Reference Voltage V
B
(V)
Reference Voltage vs. Temperature
(V
+
=3.3V)
640
660
680
700
720
740
760
-50 -25 0 25 50 75 100 125
Ambient Temperature
Ta (
o
C)
Oscillator Frequency f
OSC
(kHz)
Oscillator Frequency vs. Temperature
(V
+
=3.3V, R
T
=47k
Ω
)
40
50
60
70
80
90
100
-50 -25 0 25 50 75 100 125
Ambient Temperature
Ta (
o
C)
Muximum Duty Cycle
M
AX
D
UTY
(%)
Muximum Duty Cycle vs. Temperature
(V
+
=3.3V)
M
AX
D
UTY_1
M
AX
D
UTY_2
1.86
1.9
1.94
1.98
2.02
2.06
-50 -25 0 25 50 75 100 125
Ambient Temperature
Ta (
o
C)
Threshold Voltage (V)
Under Voltage Lockout Block
vs. Temperature
V
T_OFF
V
T_ON
NJU7606
,
NJU7608
-
9
-
Ver.2006-02-13
■TYPICAL CHARACTERISTICS
0
20
40
60
80
100
120
140
160
-50 -25 0 25 50 75 100 125
Ambient Temperature
Ta (
o
C)
LSW Output ON Resistance R
LSW
(
Ω
)
LSW Output ON Resistance vs. Temperature
(I
LSW
=1mA)
V
+
=3.3V
V
+
=1.95V
V
+
=8V
0.01
0.1
1
10
100
-50 -25 0 25 50 75 100 125
Ambient Temperature
Ta (
o
C)
LSW Output Leak Current I
LEAK_LSW
(nA)
LSW Output Leak Current vs. Temperature
(V
+
=3.3V, R
T
=47kΩ, V
LSW
=9V, V
ON/OFF
=0V)
0
200
400
600
800
1000
-50 -25 0 25 50 75 100 125
Ambient Temperature
Ta (
o
C)
Quiescent Current I
DD
(µA)
Quiescent Current vs. Temperature
(V
+
=3.3V, R
T
=47kΩ)
0
0.2
0.4
0.6
0.8
1
-50 -25 0 25 50 75 100 125
Ambient Temperature
Ta (
o
C)
Standby Current I
DD_STB
(µA)
Standby Current vs. Temperature
(V
+
=3.3V, R
T
=47kΩ, V
ON/OFF
=0V)
0.6
0.65
0.7
0.75
0.8
0.85
0.9
0.95
1
-50 -25 0 25 50 75 100 125
Ambient Temperature
Ta (
o
C)
ON/OFF Control Voltage V
ON/OFF
(V)
ON/OFF Control Voltage vs. Temperature
(V
+
=3.3V)
V
ON
V
OFF
NJU7606
,
NJU7608
- 1
0
-
Ver.2006-02-13
MEMO
[CAUTION]
The specifications on this databook are only
given for information , without any guarantee
as regards either mistakes or omissions. The
application circuits in this databook are
described only to show representative usages
of the product and not intended for the
guarantee or permission of any right including
the industrial rights.
[CAUTION]
The specifications on this databook are only
given for information , without any guarantee
as regards either mistakes or omissions. The
application circuits in this databook are
described only to show representative usages
of the product and not intended for the
guarantee or permission of any right including
the industrial rights.