Regulator IC. NJU7678 Datasheet

NJU7678 IC. Datasheet pdf. Equivalent

NJU7678 Datasheet
Recommendation NJU7678 Datasheet
Part NJU7678
Description 3A MOSFET Step-Up / Flyback Switching Regulator IC
Feature NJU7678; NJU7678 Internal 60V, 3A MOSFET Step-Up / Flyback Switching Regulator IC GENERAL DESCRIPTION NJU76.
Manufacture New Japan Radio
Datasheet
Download NJU7678 Datasheet




New Japan Radio NJU7678
NJU7678
Internal 60V, 3A MOSFET Step-Up / Flyback Switching Regulator IC
GENERAL DESCRIPTION
NJU7678 is Step-up/Fly back type switching regulator IC with
PWM control. Internal soft-start function, dead time control and
timer latch function are included, requiring no external components.
All parameters can be optimized by additional external
components for design flexibility.
FEATURES
Drain to Source Voltage
60V max.
Drain to Source Current
3A max.
PWM switching control
Operating Voltage Range
2.5V to 7.0V
Oscillating Frequency Range
300kHz to 1MHz
Maximum Duty Cycle
90% typ.
Soft-Start Function
Internal fixed value: 4ms typ.
or adjustable by external part
Dead Time Control
Timer Latch for Short Circuit Protection
Package Outline
NJU7678MLK: EQFN24
PACKAGE OUTLINE
Bottom View
NJU7678MLK
PIN CONFIGURATION
18 17 16 15 14 13
19 12
20 11
21 10
22 9
23 8
24 7
13 14 15 16 17 18
12
11
10
PAD (*1)
9
8
7
19
20
21
22
23
24
1 2 3 45
6
654 321
(Top View)
NJU7678MLK
(Bottom View)
PIN FUNCTION
1. FB
2. IN-
3. N.C.
4. SCP
5. N.C.
6. DTC
7. N.C.
8. RT
9. N.C.
10. GND
11. N.C.
12. N.C.
13. N.C.
14. SOURCE
15. SOURCE
16. SOURCE
17. SOURCE
18. N.C.
19. DRAIN
20. DRAIN
21. DRAIN
22. N.C.
23. V+
24. N.C.
(*1): Exposed Pad connected to Internal FET Drain
Ver.2010-10-26
-1-



New Japan Radio NJU7678
NJU7678
BLOCK DIAGRAM
FB
IN-
1V Vref
V+
ERAMP
Soft Start
Latch
UVLO
SCP
1V
2µA
SCP
2k
0.5
RT
A
1V
DTC
0.65V
0.15V
OSC
0.5V
PWM
Buffer
0.6V
RT
RT
GND
DRAIN
DRAIN
DRAIN
SOURCE
SOURCE
SOURCE
SOURCE
The initial soft start time is 4msec. The soft start time can be adjusted by connecting the capacitor with
the DTC pin. The charging current is calculated by 0.5/RT.
The MaxDuty is 90%@700kHz. MaxDuty can be adjusted by connecting resistance with the DTC pin.
MaxDuty is calculated by (RDTC / RT) × 86 - 24.
The short-circuit protection circuit is a timer latch type. The protection Delay time can be adjusted with
the capacitor connected with the SCP pin. To release the latch mode, it should do reclosing the power
supply (below the UVLO detection voltage) or the SCP pin down to GND level.
-2-
Ver.2010-10-26



New Japan Radio NJU7678
NJU7678
ABSOLUTE MAXIMUM RATINGS (Ta=25°C)
PARAMETER
Supply Voltage
Drain to Source Voltage
Drain to Source Current
Power Dissipation
Operating Temperature Range
Storage Temperature Range
SYMBOL
V+
VDS
IDS
PD
TOPR
TSTG
MAXIMUM RATINGS
+8
66
3
660 (*2)
1,400 (*3)
-40 ~ +85
-40 ~ +125
UNIT
V
V
A
mW
°C
°C
(*2): Mounted on glass epoxy board based on EIA/JEDEC. (101.5 × 114.5 × 1.6mm: 2 Layers FR-4)
(*3): Mounted on glass epoxy board. (101.5 × 114.5 × 1.6mm: 4 Layers FR-4, copper area 99.5 × 99.5mm)
RECOMMENDED OPERATING CONDITIONS
PARAMETER
Operating Voltage
Drain to Source Voltage
Oscillator Timing Resistor
Oscillation Frequency
SYMBOL
V+
VDS
RT
fOSC
MIN.
2.5
30
300
TYP. MAX. UNIT
–7V
– 60 V
47 120 k
700 1,000 kHz
PACKAGE THERMAL RESISTANCE
PARAMETER
SYMBOL THERMAL RESISTANCE UNIT
Junction-to-
Ambient Temperature
Junction-to-Case
θja
152 (*2)
71 (*3)
°C/W
ψjt
15.1 (*2)
9.7 (*3)
°C/W
(*2): Mounted on glass epoxy board based on EIA/JEDEC. (101.5 × 114.5 × 1.6mm: 2 Layers FR-4)
(*3): Mounted on glass epoxy board. (101.5 × 114.5 × 1.6mm: 4 Layers FR-4, copper area 99.5 × 99.5mm)
Ver.2010-10-26
-3-







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