RT8055B

4

DS8055B-03 April 2011

www.richtek.com

Absolute Maximum Ratings

(Note 1)

Supply Input Voltage, VDD, PVDD ----------------------------------------------------------------------------

−0.3V to 6.5V

LX Pin Switch Voltage --------------------------------------------------------------------------------------------

−0.3V to (PVDD+ 0.3V)

<30ns ----------------------------------------------------------------------------------------------------------------

−5V to 7.5V

Other I/O Pin Voltages -------------------------------------------------------------------------------------------

−0.3V to 6.5V

LX Pin Switch Current -------------------------------------------------------------------------------------------- 4A

°C

WDFN-10L 3x3 ----------------------------------------------------------------------------------------------------- 1.667W

Package Thermal Resistance (Note 2)

WDFN-10L 3x3,

WDFN-10L 3x3,

Junction Temperature --------------------------------------------------------------------------------------------- 150

°C

Lead Temperature (Soldering, 10 sec.) ----------------------------------------------------------------------- 260

°C

Storage Temperature Range ------------------------------------------------------------------------------------

−65°C to 150°C

ESD Susceptibility (Note 3)

HBM (Human Body Mode) -------------------------------------------------------------------------------------- 2kV

MM (Machine Mode) ---------------------------------------------------------------------------------------------- 200V

Electrical Characteristics

°C, unless otherwise specified)

To be continued

Recommended Operating Conditions

(Note 4)

Supply Input Voltage ---------------------------------------------------------------------------------------------- 2.6V to 5.5V

Junction Temperature Range ------------------------------------------------------------------------------------

−40°C to 125°C

Ambient Temperature Range ------------------------------------------------------------------------------------

−40°C to 85°C

Parameter

Symbol

Test Conditions

Min

Typ

Max

Unit

Input Voltage Range

2.6

--

5.5

V

Feedback Reference Voltage

0.784

0.8

0.816

V

Feedback Leakage Current

--

--

0.1

μA

--

500

--

μA

DC Bias Current

Shutdown

--

--

1

μA

Output Voltage Line Regulation

--

0.1

--

%/V

Output Voltage Load Regulation

--

0.4

--

%

Error Amplifier Transconductance gm

--

400

--

μA/V

Current Sense Transresistance

--

0.4

--

Ω

RT Leakage Current

--

--

1

μA

1.44

1.8

2.16

MHz

Switching Frequency

Adjustable Switching Frequency

Range

0.3

--

2

MHz

Switch On Resistance, High

--

100

160

m

Ω

Switch On Resistance, Low

--

100

170

m

Ω