30

ICs

1-1-3 DC/DC Converter ICs

Parameter

Reference Voltage

Temperature Coefficient of Reference Voltage

Efficiency

Oscillation Frequency

Line Regulation

Load Regulation

Overcurrent Protection Starting Current

Quiescent Circuit Current

SS Pin

Outflow Current at Low Voltage

High Level Voltage

EN Pin

Low Level Voltage

Inflow Current at Low Low Voltage

Error Amplifier Voltage Gain

Error Amplifier Transformer Conductance

Current Sense Amplifier Impedance

Maximum ON Duty

Minimum ON Time

■Features

• Compact surface-mount package (HSOP8)

• Introduction of current mode control method

• Output current: 3.5 A

• High efficiency: 90% (Vo = 5 V)

• Built-in reference oscillator (500 kHz)

• A ceramic capacitor can be used for output

• Built-in drooping-type overcurrent 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

Unit

V

W

°C

°C

°C/W

°C/W

Symbol

Parameter

Input Voltage

Storage Temperature

Thermal Resistance(junction to case)

Thermal Resistance(junction to ambient air)

■Absolute Maximum Ratings

Conditions

When mounted on glass-epoxy board, 30×30 mm (copper laminate area: 25×25 mm)

When mounted on glass-epoxy board, 30×30 mm (copper laminate area: 25×25 mm)

■Recommended Operating Conditions

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

Parameter

DC Input Voltage Range

Output Voltage Range

Output Current Range

Operating Junction Temperature Range

Operating Temperature Range

Symbol

Unit

V

V

A

°C

°C

Ratings

SI-8005Q

0.5 to 24

0 to 3.5

–30 to +125

–30 to +85

*1: Limited by thermal protection circuit

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

Ratings

30

1.35

–30 to +150

–40 to +150

40

74

Symbol

Conditions

Conditions

η

Conditions

fo

Conditions

Conditions

Conditions

Conditions

Iq

Conditions

Conditions

Conditions

Conditions

Conditions

Conditions

AEA

GEA

1/GCS

DMAX

DMIN

■Electrical Characteristics

Unit

V

mV/ °C

%

kHz

mV

mV

A

mA

µA

µA

V

V

µA

V/V

µA/V

V/A

%

nsec.

(R1=4.2kΩ, R2=0.8kΩ 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.

Conditions

Rating

SI-8005Q

min.

typ.

max.

0.485

0.500

0.515

0.05

90

450

500

550

30

60

30

60

3.6

6.0

18

20

5

2.8

2.2

5

1000

800

0.35

92

100

SI-8008Q

SS

8

C8

Soft start

Surface Mount, Current Mode Cntrol Step-down Switching Mode

SI-8000Q Series