Preliminary

RT9205/A

DS9205/A-03 May 2003

www.richtek.com

5

Absolute Maximum Ratings

Supply Voltage VCC

7V

BOOT & UGATE to GND

19V

Input, Output or I/O Voltage

GND

−0.3V ~ 7V

Package Thermal Resistance

SOP-14,

160

°C/W

Ambient Temperature Range

0

°C ~ +70°C

Junction Temperature Range

-40

°C ~ +125°C

Storage Temperature Range

−65°C ~ +150°C

Lead Temperature (Soldering, 10 sec.)

260

°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

Parameter

Symbol

Test Conditions

Min

Typ

Max

Units

VCC Supply Current

Nominal Supply Current

UGATE, LGATE open

--

3

--

mA

VCC Regulated Voltage

5

6

7

V

Power-On Reset

Rising VCC Threshold

3.8

4.1

4.4

V

VCC Threshold Hysteresis

--

0.5

--

V

Reference

Reference Voltage

Both PWM and linear regulator

0.784

0.8

0.816

V

Oscillator

Free Running Frequency

250

300

350

KHz

Ramp Amplitude

--

1.75

--

PWM Error Amplifier

DC gain

32

35

38

dB

PWM Controller Gate Driver

Upper Drive Source

BOOT= 12V

--

7.5

11

Ω

Upper Drive Sink

--

5

8

Ω

Lower Drive Source

--

3.5

6

Ω

Lower Drive Sink

--

2

5

Ω

Linear Regulator

DRV Driver Source

100

--

--

mA

Protection

FB Over-Voltage Trip

FB Rising

0.9

1

--

V

FB & FBL Under-Voltage Trip

FB & FBL Falling

--

0.5

0.65

V

Soft-Start Interval

--

2.5

--

mS