4
DS8241-03 January 2014
www.richtek.com
RT8241
©
Copyright 2014 Richtek Technology Corporation. All rights reserved. is a registered trademark of Richtek Technology Corporation.
Electrical Characteristics
Absolute Maximum Ratings
(Note 1)
z
VCC, FB, PGOOD, EN, CS, G0, G1 to GND -----------------------------------------------------------------------
−
0.3V to 6V
z
PHASE to GND
DC -----------------------------------------------------------------------------------------------------------------------------
−
0.3V to 32V
<20ns ------------------------------------------------------------------------------------------------------------------------
−
8V to 38V
z
BOOT to PHASE -----------------------------------------------------------------------------------------------------------
−
0.3V to 6V
z
UGATE to PHASE
DC -----------------------------------------------------------------------------------------------------------------------------
−
0.3V to 6V
<20ns ------------------------------------------------------------------------------------------------------------------------
−
5V to 7.5V
z
LGATE to GND
DC -----------------------------------------------------------------------------------------------------------------------------
−
0.3V to 6V
<20ns ------------------------------------------------------------------------------------------------------------------------
−
2.5V to 7.5V
z
Power Dissipation, P
D
@ T
A
= 25
°
C
WQFN-12L 2x2 ------------------------------------------------------------------------------------------------------------ 0.606W
z
Package Thermal Resistance (Note 2)
WQFN-12L 2x2,
θ
JA
------------------------------------------------------------------------------------------------------- 165
°
C/W
z
Junction Temperature ----------------------------------------------------------------------------------------------------- 150
°
C
z
Lead Temperature (Soldering, 10 sec.) ------------------------------------------------------------------------------- 260
°
C
z
Storage Temperature Range --------------------------------------------------------------------------------------------
−
65
°
C to 150
°
C
z
ESD Susceptibility (Note 3)
HBM (Human Body Mode) ---------------------------------------------------------------------------------------------- 2kV
MM (Machine Mode) ------------------------------------------------------------------------------------------------------ 200V
Recommended Operating Conditions
(Note 4)
z
Supply Input Voltage, V
IN
------------------------------------------------------------------------------------------------ 4.5V to 26V
z
Control Voltage, V
CC
------------------------------------------------------------------------------------------------------ 4.5V to 5.5V
z
Junction Temperature Range --------------------------------------------------------------------------------------------
−
40
°
C to 125
°
C
z
Ambient Temperature Range --------------------------------------------------------------------------------------------
−
40
°
C to 85
°
C
(V
CC
= 5V, V
IN
= 8V, V
EN
= 5V, T
A
= 25
°
C, unless otherwise specified)
Parameter Symbol
Test
Conditions
Min
Typ
Max
Unit
PWM Controller
VCC Quiescent Supply Current
I
Q
FB forced above the regulation
point, V
EN
= 5V
-- 500
1250
μ
A
VCC Shutdown Current
I
SHDN
V
CC
current, V
EN
= 0V
--
--
1
μ
A
CS Shutdown Current
CS pull to GND
--
--
1
μ
A
T
A
= 25°C
−
1 0 1
FB Error Comparator Threshold
V
FB
T
A
=
−
40°C to 85°C (Note 5)
−
1.5 0 1.5
%
V
OUT
Voltage Range
V
OUT
0.675 -- 3.3 V
RT8241A V
FB
= 0.9V (f
SW
= 300kHz)
--
400
--
RT8241B V
FB
= 0.9V (f
SW
= 400kHz)
--
300
--
On-Time, Pulse Width
RT8241C
t
ON
V
FB
= 0.9V (f
SW
= 500kHz)
--
240
--
ns
Minimum Off-Time
t
OFF
250
400
550
ns
