Document
NJU7602
Step-Up / Flyback switching regulator IC with standby function
■GENERAL DESCRIPTION The NJU7602 is a low voltage operation high-speed
switching regulator control IC for step-up and flyback converter, with a standby function. It incorporates a totem pole output, which can drive an external MOS-FET easily. The NJU7602 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. Further the internal standby function minimize the current during non-active condition. It is available in 8-lead DMP and MSOP (TVSP) packages, and it is suitable for battery powered applications.
■PACKAGE OUTLINE
NJU7602M (DMP8)
NJU7602RB1 (MSOP8(TVSP8))
■FEATURES
■PRODUCT VARIATION
● PWM switching control
● Standby Function
NJU760x**
● Operating Voltage ● Wide Oscillator Range
2.2V to 8V 300kHz to 1MHz
Standby Terminal
● Maximum Duty Cycle
90% typ.
NJU7602
● Quiescent Current ● Soft-Start Function
Operating :800µA typ. Standby :1µA max. Internal :16ms typ. or adjustable
Standby Function
NJU7600
● Dead Time Control ● Timer Latch for Short Circuit Protection
PWM Control
● C-MOS Technology
** Planning
● Package Outline
NJU7602M : DMP8
NJU7602RB1 : MSOP8 (TVSP8)*
*MEET JEDEC MO-187-DA / THIN TYPE
■PIN CONFIGURATION
1 2 3 4
NJU7602M NJU7602RB1
8 7 6 5
PIN FUNCTION 1. V+ 2. FB 3. IN 4. SCP 5. DTC 6. RT 7. GND 8. OUT
Ver.2012-08-03
-1-
NJU7602
■BLOCK DIAGRAM
FB
IN-
1V Vref
V+
ER⋅AMP
Soft Start
Latch
UVLO
SCP
1V
2µA SCP
2kΩ 1V
0.5 RT
A
DTC
0.8V 0.2V
OSC 0.5V
PW M
Buffer
OUT
0.74V
Standby ON/OFF
RT RT
V+ GND RP
ON/OFF
High: ON Low : OFF (Standby)
-2-
Ver.2012-08-03
NJU7602
■ABSOLUTE MAXIMUM RATINGS
PARAMETER
Supply Voltage Output Pin Current Power Dissipation
SYMBOL V+ IO
PD
Operating Temperature Range Storage Temperature Range
TOPR TSTG
MAXIMUM RATINGS
+9 ±50 DMP8 :300 MSOP8 (TVSP8) :320 -40 to +85
-40 to +125
(Ta=25°C) UNIT V mA
mW
°C °C
■RECOMMENDED OPERATING CONDITIONS
PARAMETER
Operating Voltage Oscillator Timing Resistor Oscillation Frequency
SYMBOL V+
RT fOSC
MIN.
2.2 30 300
(Ta=25°C)
TYP. MAX. UNIT
–8V 47 120 kΩ 700 1,000 kHz
■ELECTRICAL CHARACTERISTICS
PARAMETER
SYMBOL
TEST CONDITION
Under Voltage Lockout Block ON Threshold Voltage OFF Threshold Voltage Hysteresis Voltage
Soft Start Block Soft Start Time
Short Circuit Protection Block Input Threshold Voltage Charge Current Latch Mode ON Threshold Voltage Latch Mode OFF Threshold Voltage
Oscillator Block RT Pin Voltage Oscillation Frequency Oscillate Supply Voltage Fluctuations Oscillate Temperature Fluctuations Standby RT Terminal Resistance
VT_ON VT_OFF VHYS
V+= L → H V+= H → L
TSS VT_ON → Duty=80%
VT_PC ICHG
VT_LA
FB Pin VSCP=0V
SCP Pin
VT_LAOFF SCP Pin
VRT fOSC fDV
fDT
RT_STB
V+=2.2V to 8V Ta=-40°C to +85°C
(V+=3.3V, RT=47kΩ, Ta=25°C) MIN. TYP. MAX. UNIT
1.9 2.0 2.1 V
1.8 1.9 2.0 V
60 100
– mV
8 16 24 ms
0.95 1.00 1.05 V 1.5 2 2.5 µA 0.95 1.00 1.05 V
0.2 0.45 0.7 V
-5% 0.5 +5% V 630 700 770 kHz
– 1 –%
– 3 –%
– 2 – MΩ
Ver.2012-08-03
-3-
NJU7602
■ELECTRICAL CHARACTERISTICS
PARAMETER
SYMBOL
TEST CONDITION
Error Amplifier Block Reference Voltage Input Bias Current Open Loop Gain Gain Bandwidth Product
Output Source Current
Output Sink Current
PWM Complete Block
Input Threshold Voltage
Maximum Duty Cycle
Output Block Output High Level ON Resistance Output Low Level ON Resistance
VB
IB AV GB IOM+_1 IOM+_2 IOM-
VFB=1V, VIN-=0.9V VFB=1V, VIN-=0.9V, V+=2.2V
VFB=1V, VIN-=1.1V
VT_0 VT_50 MAXDUTY_1 MAXDUTY_2
Duty=0% Duty=50% VFB=0.9V VFB=0.9V, RDTC=47kΩ
ROH IO=-20mA ROL IO=+20mA
General Characteristics Quiescent Current Standby Quiescent Current
IDD IDD_STB
RL=Non Load RT=Open
(V+=3.3V, RT=47kΩ, Ta=25°C) MIN. TYP. MAX. UNIT
-1.5% 1.00 +1.5% V -0.1 – 0.1 µA
– 80 – dB – 1 – MHz 20 45 70 mA 4 9 16 mA 0.10 0.16 0.22 mA
0.16 0.22 0.28 V 0.44 0.5 0.56 V 85 90 95 % 40 50 60 %
– 10 20 Ω – 5 10 Ω
– 800 1200 µA – – 1.0 µA
-4-
Ver.2012-08-03
■ TYPICAL APPLICATIONS
Step-Up Converter
V+
L CIN
SBD
C
CNF RNF
NJU7602
1 V+
OUT 8
2 FB
GND 7
3 IN-
RT 6
4 SCP DTC 5
CSCP
RDTC
FET
COUT
RP RT
ON/OFF
High : ON
CS Low : OFF (Standby)
NJU7602
VOUT R2 R1
Flyback Converter
V+
C
CNF RNF
NJU7602
1 V+
OUT 8
2 FB
GND 7
3 IN-
RT 6
4 SCP DTC 5
CSCP
RDTC
T CIN
FET
RP RT
SBD COUT
ON/OFF
High : ON
CS Low : OFF (Standby)
VOUT R2
R1
Ver.2012-08-03
-5-
NJU7602
■TYPICAL CHARACTERISTICS
Oscillation Frequency vs. Timing Resistance
1000
(V+=3.3V, Ta=25oC)
Oscillation Frequency f (kHz)
OSC
Oscillation Frequency fosc (kHz)
100 10
100 Timing Resistance RT (kΩ)
Oscillation Frequency vs. Operating Voltage 740 (RT=47kΩ, Ta=25oC)
720
700
680
660 0
2468 Operating Voltage V+ (V)
10
Reference Voltage vs. Operating Voltage
1.004
(Ta=25oC)
1.002
1
0.998
0.996.