RT2805A
Absolute Maximum Ratings
(Note 1)
Supply Voltage, VIN -----------------------------------------------------------------------------------------
−0.3V
to 40V
Switching Voltage, SW -------------------------------------------------------------------------------------
−0.3V
to (V
IN
+
0.3V)
BOOT Voltage ------------------------------------------------------------------------------------------------- (V
SW
−
0.3V) to (V
SW
+
6V)
Other Pins ------------------------------------------------------------------------------------------------------
−0.3V
to 6V
Power Dissipation, P
D
@ T
A
= 25°C
SOP-8 (Exposed Pad) -------------------------------------------------------------------------------------- 2.04W
Package Thermal Resistance (Note 2)
SOP-8 (Exposed Pad),
θ
JA
--------------------------------------------------------------------------------- 49°C/W
SOP-8 (Exposed Pad),
θ
JC
-------------------------------------------------------------------------------- 15°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 Model) --------------------------------------------------------------------------------- 2kV
Recommended Operating Conditions
(Note 4)
Supply Voltage, VIN ----------------------------------------------------------------------------------------- 5.5V to 36V
Junction Temperature Range -------------------------------------------------------------------------------
−
40°C to 125°C
Ambient Temperature Range -------------------------------------------------------------------------------
−
40°C to 85°C
Electrical Characteristics
Parameter
Reference Voltage
High Side Switch-On Resistance
Low Side Switch-On Resistance
Current Limit
Oscillator Frequency
Short Circuit Frequency
Maximum Duty Cycle
Minimum On-Time
Under Voltage Lockout Threshold
Rising
Under Voltage Lockout Threshold
Hysteresis
Logic-High
EN Threshold
Voltage
Logic-Low
Enable Pull Up Current
Shutdown Current
Quiescent Current
Soft-Start Period
Thermal Shutdown
(V
IN
= 12V, T
A
=
−40°C
to 85°C unless otherwise specified)
Symbol
V
REF
R
DS(ON)1
R
DS(ON)2
I
LIM
f
OSC
D
MAX
t
ON
Test Conditions
T
A
= 25°C
I
OUT
= 0A to 5A
Bias Gate Driver at V
IN
= 5.5V
Bias Gate Driver at V
IN
= 5.5V
Voltage Mode Test
V
FB
= 0.8V
V
FB
= 0V
V
FB
= 0.8V
Come from Maximum Duty Cycle
V
IN
Rising, Check Switching
V
IN
Falling, Check Switching
Min
Typ
Max
Unit
V
mΩ
Ω
A
kHz
kHz
%
ns
V
mV
V
μA
μA
mA
ms
°C
1.202 1.222 1.239
1.196 1.222 1.245
--
110
230
--
6
400
--
85
--
--
--
1.4
--
--
--
--
3
--
10
7.5
500
150
90
100
4.2
315
--
--
1
25
0.6
5
160
15
9
600
--
95
150
5
--
--
0.4
--
45
1
10
--
V
IH
V
IL
I
SHDN
I
Q
T
SD
Let EN = 1.4V, Check I
Q
Let EN = 0.4V, Check I
Q
V
EN
= 0V
V
EN
= 2V, V
FB
= 1.5V
Copyright
©
2012 Richtek Technology Corporation. All rights reserved.
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
4
DS2805A-00 November 2012
RICHTEK [ RICHTEK TECHNOLOGY CORPORATION ]
