RT9907

Preliminary

7

DS9907-07 August 2007

www.richtek.com

Parameter

Symbol

Test Condition

Min

Typ

Max

Units

Oscillator

Operation Frequency Range

RT Open

475

550

625

kHz

CH1 Maximum Duty Cycle

--

85

90

%

CH2 Maximum Duty Cycle

--

--

100

%

CH3 Maximum Duty Cycle

--

--

100

%

Feedback Voltage (CH1, CH2, CH3)

Feedback Voltage

CH1, CH2, CH3

0.788

0.8

0.812

V

Feedback Voltage

︱Δ

CH1, CH2, CH3

--

--

12

mV

Error Amplifier

GM

--

0.2

--

ms

Compensation Source Current

--

22

--

μA

Compensation Sink Current

--

22

--

μA

Power Switch

CH1 On Resistance of MOSFET

N-MOSFET

--

300

400

mΩ

CH1 Current Limitation

2

2.6

3

A

--

350

450

mΩ

CH2 On Resistance of MOSFET

--

350

450

mΩ

CH2 Current Limitation

1.3

1.5

1.9

A

--

350

450

mΩ

CH3 On Resistance of MOSFET

--

350

450

mΩ

CH3 Current Limitation

1.3

1.5

1.9

A

UVP (CH2, CH3) & Over Voltage Protection (CH2)

UVP Threshold Voltage @FB2, FB3

0.3

0.4

0.5

V

Over Voltage Protection @FB2

0.95

1

--

V

Control

ENM, EN1, EN2, EN3 Input High

Level Threshold

--

0.8

1.3

V

ENM, EN1, EN2, EN3 Input Low

Level Threshold

0.4

0.8

--

V

Thermal Protection

Thermal Shutdown

140

180

--

°C

Thermal Shutdown Hysteresis

Δ

--

10

--

°C

Note 1.

Stresses listed as the above "Absolute Maximum Ratings" may cause permanent damage to the device. These are for

stress ratings. Functional operation of the device at these or any other conditions beyond those indicated in the

operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended

periods may remain possibility to affect device reliability.

Note 2.

Devices are ESD sensitive. Handling precaution recommended.

Note 3.

JEDEC 51-3 thermal measurement standard.