NJU7606
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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 : MSOP10 (TVSP10)*
*MEET JEDEC MO-187-DA / THIN TYPE
■PIN CONFIGURATION
The NJU7606 are low voltage operation high speed switching
regulator control ICs for step-up and flyback converter, with a load
switch function.
The load switch function can disrupt the current flow to the load in
standby mode and latch mode. The NJU7606 also have a soft-star
t
function, dead time control and timer latch for short circuit protection
and their times are all adjustable with external parts. The NJU7606
is available in 10-lead MSOP (TVSP) package.
They are suitable for battery powered applications.
NJU7606RB2
(MSOP10(TVSP10))
NJU7606
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
NJU7606
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■BLOCK DIAGRAM
Buffer
0.74V
0.5V
OSC
1V
0.5
RT
A
2kΩ
2µA
UVLO
Soft Start
Vref
1V
1V
0.8V
0.2V
OUT
GND RT DTC
RT
SCP
IN-
FB
V
+
PW M
SCP
ER⋅AMP
Latch
Standby
ON/OFF
ON/OFF
High: ON
Low : OFF (Standby)
LSW
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■ABSOLUTE MAXIMUM RATINGS (Ta=25°C)
PARAMETER SYMBOL MAXIMUM RATINGS UNIT
Supply Voltage V+ +9 V
LSW Output Voltage VLSW +9 V
Output Pin Current IO ±50 mA
LSW Output Current ILSW -10 mA
ON/OFF Pin Voltage VON/OFF +9 (*1) V
Power Dissipation PD 320 mW
Operating Temperature Range TOPR -40 to +85 °C
Storage Temperature Range TSTG -40 to +125 °C
*1: When input voltage is less than 9V, the absolute maximum control voltage is equal to the input voltage.
■RECOMMENDED OPERATING CONDITIONS (Ta=25°C)
PARAMETER SYMBOL MIN. TYP. MAX. UNIT
Operating Voltage V+ 2.2 – 8 V
Oscillator Timing Resistor RT 30 47 120 kΩ
Oscillation Frequency fOSC 300 700 1,000 kHz
■ELECTRICAL CHARACTERISTICS (V
+=VON/OFF=3.3V, RT=47kΩ, Ta=25°C)
PARAMETER SYMBOL TEST CONDITION MIN. TYP. MAX. UNIT
Under Voltage Lockout Block
ON Threshold Voltage VT_ON V
+= L → H 1.9 2.0 2.1 V
OFF Threshold Voltage VT_OFF V
+= H → L 1.8 1.9 2.0 V
Hysteresis Voltage VHYS 60 100 – mV
Soft Start Block
Soft Start Time TSS V
T_ON → Duty=80% 8 16 24 ms
Short Circuit Protection Block
Input Threshold Voltage VT_PC FB Pin 0.95 1.00 1.05 V
Charge Current ICHG V
SCP=0V 1.5 2 2.5
µA
Latch Mode
ON Threshold Voltage VT_LA SCP Pin 0.95 1.00 1.05 V
Latch Mode
OFF Threshold Voltage VT_LAOFF SCP Pin 0.2 0.45 0.7 V
Oscillator Block
RT Pin Voltage VRT -5% 0.5 +5% V
Oscillation Frequency fOSC 630 700 770 kHz
Oscillate Supply Voltage
Fluctuations fDV V
+=2.2V to 8V – 1 – %
Oscillate Temperature
Fluctuations fDT Ta=- 40°C to +85°C – 3 – %
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■ELECTRICAL CHARACTERISTICS (V
+=VON/OFF=3.3V, RT=47kΩ, Ta=25°C)
PARAMETER SYMBOL TEST CONDITION MIN. TYP. MAX. UNIT
Error Amplifier Block
Reference Voltage VB -1.5% 1.00 +1.5% V
Input Bias Current IB -0.1 – 0.1
µA
Open Loop Gain AV – 80 – dB
Gain Bandwidth Product GB – 1 – MHz
IOM+_1 V
FB=1V, VIN-=0.9V 20 45 70 mA
Output Source Current IOM+_2 V
FB=1V, VIN-=0.9V, V+=2.2V 4 9 16 mA
Output Sink Current IOM- V
FB=1V, VIN-=1.1V 0.10 0.16 0.22 mA
PWM Comparate Block
VT_0 Duty=0% 0.16 0.22 0.28 V
Input Threshold Voltage VT_50 Duty=50% 0.44 0.5 0.56 V
MAXDUTY_1 V
FB=0.9V 85 90 95 %
Maximum Duty Cycle MAXDUTY_2 V
FB=0.9V, RDTC=47kΩ 40 50 60 %
Output Block
Output High Level
ON Resistance ROH I
O=-20mA – 10 20 Ω
Output Low Level
ON Resistance ROL I
O=+20mA – 5 10 Ω
Load SW Output Block
LSW Output ON Resistance RLSW I
LSW=1mA – 55 100 Ω
LSW Output Leak Current ILEAK_LSW V
LSW=9V, VON/OFF=0V – – 0.1
µA
ON/OFF Block
ON Control Voltage VON V
ON/OFF= L → H 1.6 – V+ V
OFF Control Voltage VOFF V
ON/OFF= H → L 0 – 0.3 V
General Characteristics
Quiescent Current IDD R
L=Non Load – 800 1200 µA
Standby Current IDD_STB V
ON/OFF=0V – – 1.0
µA
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Ver.2012-08-01
■ TYPICAL APPLICATIONS
Step-Up Converter (Input Line Load SW)
SCP
V+ VOUT
SBD
IN-
FB
V+
DTC
RT
GND
OUT
GND
LSW
ON/OFF
FET:
Load SW
NJU7606
ON/OFF
High : ON
Low : OFF (Standby)
CSCP
CIN
FET
R2
R1
COUT
L
CNF
RNF
RDTC
CS
C
RT
RP
Step-Up Converter (Onput Line Load SW)
SCP
V+ VOUT
SBD
IN-
FB
V+
DTC
RT
GND
OUT
GND
LSW
ON/OFF
FET: Load SW
NJU7606
ON/OFF
High : ON
Low : OFF (Standby)
CSCP
CIN
FET
R2
R1
COUT
L
CNF
RNF
RDTC
CS
C
RT
RP
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■TYPICAL CHARACTERISTICS
100
1000
10 100
Oscillation Frequency fOSC (kHz)
Oscillation Frequency vs. Timing Resistance
(V+=3.3V, Ta=25
oC)
Timing Resistance R
T (kΩ)
80
85
90
95
100
100 1000
Maximum Duty Cycle
MAXDUTY_1 (%)
Maximum Duty Cycle vs. Oscillator Frequency
(V+=3.3V, Ta=25
oC)
Oscillator Frequency f
OSC (kHz)
660
680
700
720
740
0246810
Oscillation Frequency fosc (kHz)
Operating Voltage V
+ (V)
Oscillation Frequency vs. Operating Voltage
(RT=47kΩ, Ta=25oC)
0
20
40
60
80
100
0 20406080100
Duty Cycle MAXDUTY (%)
Dead Time Control Resistance R
DTC (kΩ)
Duty Cycle vs. R
DTC
(V+=3.3V, RT=47kΩ, Ta=25oC)
0.996
0.998
1
1.002
1.004
0246810
Reference Voltage VB (V)
Operating Voltage V
+ (V)
Reference Voltage vs. Operating Voltage
(Ta=25oC)
(V+=3.3V, Gain=40dB, Ta=25
oC)
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
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■TYPICAL CHARACTERISTICS
0
200
400
600
800
1000
1200
1400
0246810
Quiescent Current IDD (µA)
Operating Voltage V
+ (V)
Quiescent Current vs. Operating Voltage
(RT=47kΩ, RL=Non Load, Ta=25
oC)
0
0.2
0.4
0.6
0.8
1
0246810
Standby Current IDD_STB (nA)
Operating Voltage V
+ (V)
Standby Current vs. Operating Voltage
(RT=47kΩ, VON/OFF=0V, Ta=25oC)
0
2
4
6
8
10
12
14
16
-50 -25 0 25 50 75 100 125
Ambient Temperature
Ta (oC)
Output High Level ON Resistance
ROH (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 (oC)
Output Low Level ON Resistance
ROL (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 I
OM- (mA)
Error Amplifier Block
Output Sink Current vs. Temperature
(VFB=1V, VIN-=1.1V)
V+=1.95V, 3.3V, 8V
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■TYPICAL CHARACTERISTICS
8
10
12
14
16
18
20
22
24
-50 -25 0 25 50 75 100 125
Ambient Temperature
Ta (oC)
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 (oC)
Reference Voltage VB (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 (oC)
Oscillator Frequency fOSC (kHz)
Oscillator Frequency vs. Temperature
(V+=3.3V, RT=47kΩ)
40
50
60
70
80
90
100
-50 -25 0 25 50 75 100 125
Ambient Temperature
Ta (oC)
Muximum Duty Cycle
MAXDUTY (%)
Muximum Duty Cycle vs. Temperature
(V+=3.3V)
MAXDUTY_1
MAXDUTY_2
1.86
1.9
1.94
1.98
2.02
2.06
-50 -25 0 25 50 75 100 125
Ambient Temperature
Ta (oC)
Threshold Voltage (V)
Under Voltage Lockout Block
vs. Temperature
VT_OFF
VT_ON
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■TYPICAL CHARACTERISTICS
0
20
40
60
80
100
120
140
160
-50 -25 0 25 50 75 100 125
Ambient Temperature
Ta (oC)
LSW Output ON Resistance RLSW (Ω)
LSW Output ON Resistance vs. Temperature
(ILSW =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 (oC)
LSW Output Leak Current ILEAK_LSW (nA)
LSW Output Leak Current vs. Temperature
(V+=3.3V, RT=47kΩ, VLSW =9V, VON/OFF=0V)
0
200
400
600
800
1000
-50 -25 0 25 50 75 100 125
Ambient Temperature
Ta (oC)
Quiescent Current IDD (µA)
Quiescent Current vs. Temperature
(V+=3.3V, RT=47kΩ)
0
0.2
0.4
0.6
0.8
1
-50 -25 0 25 50 75 100 125
Ambient Temperature
Ta (oC)
Standby Current IDD_STB (µA)
Standby Current vs. Temperature
(V+=3.3V, RT=47kΩ, VON/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 (oC)
ON/OFF Control Voltage V
ON/OFF (V)
ON/OFF Control Voltage vs. Temperature
(V+=3.3V)
VON
VOFF
NJU7606
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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.
