RT9227A

Preliminary

www.richtek-ic.com.tw

DS9227A-02 July 2001

2

Absolute Maximum Ratings

Supply Voltage

+15V

PGOOD and GATE Voltage

GND

Input, Output or I/O Voltage

GND

− 0.3V to 7V

Ambient Temperature Range

0

°C to +70°C

Junction Temperature Range

0

°C to +125°C

Storage Temperature Range

-65

°C to +150°C

Lead Temperature (Soldering, 10 sec.)

300

°C

Package Thermal Resistance

SOP-24,

75

°C/W

Recommended Operating Conditions

Supply Voltage

+12V

±10%

Ambient Temperature Range

0

°C to 70°C

Junction Temperature Range

0

°C to 125°C

CAUTION:

Stresses beyond the ratings specified in “Absolute Maximum Ratings” may cause permanent damage to the

device. This is a stress only rating and operation of the device at these or any other conditions above those

indicated in the operational sections of this specification is not implied.

Electrical Characteristics

°C, unless otherwise specified)

Parameter

Symbol

Test Conditions

Min

Typ

Max

Units

VCC Supply Current

Nominal Supply Current

UGATE1, GATE3, LGATE1,

and VOUT2 Open

--

10

--

mA

Power-On Reset

VCC Rising Threshold

7.5

--

9.5

V

VCC Falling Threshold

7--

9

V

Rising VIN2 Under-Voltage Threshold

--

--

2.8

V

VIN2 Under-Voltage Hysteresis

--

0.5

--

V

--

1.25

--

V

Oscillator

Free Running Frequency

180

200

225

KHz

Ramp Amplitude

--

1.9

--

Reference and DAC

DAC (VID0 – VID4) Input Low Voltage

--

--

0.8

V

DAC (VID0 – VID4) Input High Voltage

2.0

--

--

V

DACOUT Voltage Accuracy

DACOUT = 2.05 ~ 3.50V

-1

--

1

%

DACOUT Voltage Accuracy

DACOUT = 1.30 ~ 2.00V

-1%

--

20mV

--

To be continued