NJU7601
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1
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Ver.2012-08-03
Step-Up/Flyback Switching Regulator IC with Power Saving PWM/PFM control
■GENERAL DESCRIPTION ■PACKAGE OUTLINE
■FEATURES ■PRODUCT VARIATION
● Automatic PWM/PFM Control
● Operating Voltage 2.2V to 8V
● Wide Oscillator Range 300kHz to 1MHz
● Maximum Duty Cycle 90% typ.
● Quiescent Current 800µA typ.
● Soft-Start Function Internal : 16ms typ. or adjustable
● Dead Time Control
● Timer Latch for Short Circuit Protection
● C-MOS Technology
● Package Outline NJU7600M : DMP8 ** Planning
NJU7600RB1 : MSOP8 (TVSP8)*
*MEET JEDEC MO-187-DA / THIN TYPE
■PIN CONFIGURATION
The NJU7601 is a low voltage operation high-speed switching
regulator control IC for step-up and fly-back converter, with
PWM/PFM switching control. It can improve a switching
efficiency on light load with automatically changing between
PWM and PFM controls, and incorporates a totem pole output,
which can drive an external MOS-FET easily. The NJU7601 also
has a soft-start function, dead time control and timer latch for
short circuit protection and their times are all adjustable with
external parts. It is available in 8-lead DMP and MSOP (TVSP)
packages. It is suitable for battery powered applications.
PIN FUNCTION
1. V+
2. FB
3. IN-
4. SCP
5. DTC
6. RT
7. GND
8. OUT
NJU7601M
NJU7601RB1
1 8
2 7
3 6
4 5
NJU7601
NJU760x**
Standby Function
PWM/PFM
NJU7600
PWM Control
PWM/PFM
Light Load to Efficiency
NJU7601M
(DMP8)
NJU7601RB1
(MSOP8(TVSP8))
NJU7601
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2
-Ver.2012-08-03
■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
GNDRT DTC
RT
SCP
IN-
FB
V
+
PWM
SCP
ER⋅AMP
Latch
PWM/PFM
Control
NJU7601
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Ver.2012-08-03
■ABSOLUTE MAXIMUM RATINGS (Ta=25°C)
PARAMETER SYMBOL MAXIMUM RATINGS UNIT
Supply Voltage V+ +9 V
Output Pin Current IO ±50 mA
Power Dissipation PD DMP8 :300
MSOP8 (TVSP8) :320 mW
Operating Temperature Range TOPR -40 to +85 °C
Storage Temperature Range TSTG -40 to +125 °C
■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
+=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= -4 0°C to +85°C – 3 – %
NJU7601
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■ELECTRICAL CHARACTERISTICS (V
+=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 25 55 95 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 Complete Block
VT_0 Duty=PFMDUTY 0.29 0.35 0.41 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 %
PWM/PFM Change Duty Cycle PFMDUTY 17 25 33 %
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
General Characteristics
Quiescent Current IDD R
L=Non Load – 800 1200 µA
NJU7601
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Ver.2012-08-03
■ TYPICAL APPLICATIONS
Step-Up Converter
SCP
V
+
VOUT
CSCP
1
CIN
FET
R2
SBD
R1
COUT
L
CNF
RNF
2
3
45
6
7
8
RDTC
CS
IN-
FB
V
+
DTC
RT
GND
OUT
RT
C NJU7601
Flyback Converter
SCP
V
+
VOUT
CSCP
1
CIN
FET
R2
SBD
R1
COUT
T
CNF
RNF
2
3
4 5
6
7
8
RDTC
CS
IN-
FB
V
+
DTC
RT
GND
OUT
RT
C NJU7601
NJU7601
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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)
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)
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Ver.2012-08-03
■TYPICAL CHARACTERISTICS
(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
0
2
4
6
8
10
12
14
-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 IOM- (mA)
Error Amplifier Block
Output Sink Current vs. Temperature
(VFB=1V, VIN-=1.1V)
V+=1.95V, 3.3V, 8V
NJU7601
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-Ver.2012-08-03
■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
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)
NJU7601
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Ver.2012-08-03
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.
