NJU7680

- 4 -

Ver.2010-03-31

•Soft Start Feature (Soft Start)

The soft-start is internally set for 4ms typ. To adjust the time, insert resistance or connect capacitor to the DTC pin.

•Max Duty

Max Duty is set 90% for CH1 (Step-up) and 100% for CH2 (Step-down).

Max Duty can be adjusted by connecting the VERG pin to the DTC pin. When not limiting Max Duty, short the DTC pin

to the VREG terminal.

•Short Circuit Protection

The short circuit protection block employs time latch, and protection delay time can be adjusted by a capacitor

connected to SCP pin. The program of timer latch circuit can be reset by restarting the power (supply voltage must be

lower than UVLO sensing voltage), setting IC to standby status, or lowering SCP pin to GND level.

■ABSOLUTE MAXIMUM RATINGS (Ta=25°C)

PARAMETER

SYMBOL

MAXIMUM RATINGS

UNIT

Supply Voltage

+8

V

Output Pin Current

±50

mA

CE1 Pin Voltage

+8 (*2)

V

CE2 Pin Voltage

+8 (*2)

V

Power Dissipation

SSOP16

PCSP24-ED

: 300

: 475 (*3)

mW

Operating Temperature Range

-40 ~ +85

°C

Storage Temperature Range

-40 ~ +125

°C

(*2): When input voltage is less than 8V, the absolute maximum control voltage is equal to the input voltage.

(*3): Mounted on glass epoxy board based on EIA/JEDEC. (114.3 × 76.2 × 1.6mm: 2Layers)

■RECOMMENDED OPERATING CONDITIONS (Ta=25°C)

PARAMETER

SYMBOL

MIN.

TYP.

MAX.

UNIT

Operating Voltage

2.3

–

7

V

Oscillator Timing Resistor

30

47

120

k

Ω

Oscillation Frequency

300

700

1,000

kHz