SI-8008Q

8

SS

C8

30

ICs

Soft start

1- 1-3 DC/DC Converter ICs

■ Features

• Compact surface-mount package (HSOP8)

• Introduction of current mode control method

• Output current: 3.5A

• High efficiency: 90% (Vo = 5 V)

• Built-in reference oscillator (500 kHz)

• A ceramic capacitor can be used for output

• Built-in drooping-type over current and thermal

protection circuits

• Built-in soft start circuit

• Built-in on/off function (Active Hi)

• Low current consumption during off

■ Applications

• DVD recorder, FPD-TV

• Onboard local power supplies

• OA equipment

■ Absolute Maximum Ratings

*1 : Limited by thermal protection circuit

*2: Note that the detection temperature for thermal protection is about 140°C.

■ Recommended Operating Conditions

*1 : The minimum value of the input voltage range is 4.75 V or Vo +3 V, whichever is higher.

■ Electrical Characteristics

(R1=46k

Ω, R2=5.1kΩ when Ta = 25°C and Vo=5V)

*: Pin 8 is the SS pin. Soft start at power on can be performed with a capacitor connected to this pin.

The SS pin is pulled up to the power supply in the IC, so applying the external voltage is prohibited.

Parameter

Symbol

Ratings

Unit

Conditions

Input Voltage

VIN

30

V

Power Dissipation*1

PD

1.35

W

When mounted on glass

–epoxy board, 30×30 mm (copper

laminate area : 25×25 mm)

Junction Temperature*2

Tj

–30 to +1 50

°C

Storage Temperature

Tstg

–40 to +1 50

°C

Thermal Resistance (junction to

case)

θj-c

40

°C/W

Thermal Resistance (junction to

ambient air)

θj-a

74

°C/W

When mounted on glass epoxy board, 30×30mm (copper

laminate area : 25×25 mm)

Parameter

Symbol

Ratings

Unit

Conditions

SI-8005Q

DC Input Voltage Range

Vo+3*1 to 28

V

Output Voltage Range

0.5 to 24

V

Output Current Range

0to3.5

A

Operating Junction Temperature Range

–30 to +125

°C

Operating Temperature Range

–30 to +85

°C

Parameter

Symbol

Rating

Unit

SI-8005Q

min.

typ.

max.

Reference Voltage

0.485

0.500

0.515

V

Conditions

Temperature Coefficient of Reference Voltage

∆T

0.05

mV/°C

Conditions

Efficiency

η

90

%

Conditions

VIN=12V, Io=1A

Oscillation Frequency

fo

450

500

550

kHz

Conditions

Line Regulation

30

60

mV

Conditions

Load Regulation

30

60

mV

Conditions

Over current Protection Starting Current

3.6

6.0

A

Conditions

Quiescent Circuit Current

Iq

18

mA

Conditions

20

µA

Conditions

SS Pin

Outflow Current at Low Voltage

5

µA

Conditions

EN Pin

High Level Voltage

2.8

V

Conditions

Low Level Voltage

2.2

V

Conditions

Inflow Current at Low Low Voltage

5

µA

Conditions

Error Amplifier Voltage Gain

AEA

1000

V/V

Error Amplifier Transformer Conductance

GEA

800

µA/V

Current Sense Amplifier Impedance

1/GCS

0.35

V/A

Maximum ON Duty

DMAX

92

%

Minimum ON Time

DMIN

100

nsec.