RT8055B
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
Power Dissipation, P
D
@ T
A
= 25°C
WDFN-10L 3x3 ----------------------------------------------------------------------------------------------------- 1.667W
Package Thermal Resistance (Note 2)
WDFN-10L 3x3,
θ
JA
----------------------------------------------------------------------------------------------- 60°C/W
WDFN-10L 3x3,
θ
JC
----------------------------------------------------------------------------------------------- 7.8°C/W
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
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
Electrical Characteristics
(V
DD
= 3.3V, T
A
= 25°C, unless otherwise specified)
Parameter
Input Voltage Range
Feedback Reference Voltage
Feedback Leakage Current
DC Bias Current
Output Voltage Line Regulation
Output Voltage Load Regulation
Symbol
V
DD
V
REF
I
FB
Test Conditions
Min
2.6
0.784
Typ
--
0.8
--
500
--
0.1
0.4
400
0.4
--
1.8
--
100
100
Max
5.5
0.816
0.1
--
1
--
--
--
--
1
2.16
2
160
170
Unit
V
V
μA
μA
μA
%/V
%
μA/V
Ω
μA
MHz
MHz
mΩ
mΩ
V
FB
= 3.3V
Active, V
FB
= 0.7V, Not Switching
Shutdown
--
--
--
--
--
--
--
ΔV
LINE
ΔV
LOAD
V
IN
= 2.6V to 5.5V
V
IN
= 5V, V
OUT
= 3.3V,
I
OUT
= 0A to 3A
Error Amplifier Transconductance gm
Current Sense Transresistance
RT Leakage Current
Switching Frequency
Switch On Resistance, High
Switch On Resistance, Low
R
S
SHDN/RT = V
IN
= 5.5V
R
OSC
= 180kΩ
Adjustable Switching Frequency
Range
R
DS(ON)_P
I
SW
= 0.3A
R
DS(ON)_N
I
SW
= 0.3A
--
1.44
0.3
--
--
To be continued
www.richtek.com
4
DS8055B-03 April 2011
RICHTEK [ RICHTEK TECHNOLOGY CORPORATION ]
