RT9741
3
DS9741-01 March 2015 www.richtek.com
©
Copyright 2015 Richtek Technology Corporation. All rights reserved. is a registered trademark of Richtek Technology Corporation.
Absolute Maximum Ratings (Note 1)
Supply Input Voltage, VIN ----------------------------------------------------------------------------------------------- 6V
Power Dissipation, P
D
@ T
A
= 25°C
SOT-23-3 -------------------------------------------------------------------------------------------------------------------- 0.41W
Package Thermal Resistance (Note 2)
SOT-23-3, θ
JA
--------------------------------------------------------------------------------------------------------------- 243.3°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 Input Voltage, VIN ----------------------------------------------------------------------------------------------- 2.7V to 5.5V
Junction Temperature Range --------------------------------------------------------------------------------------------
−40°C to 125°C
Ambient Temperature Range --------------------------------------------------------------------------------------------
−40°C to 85°C
Electrical Characteristics
(V
IN
= 5V, C
IN
= 1μF, C
OUT
= 10μF, T
A
= 25°C, unless otherwise specified)
Parameter Symbol Test Conditions Min Typ Max Unit
Input Quiescent Current I
Q
Switch On, V
OUT
= Open -- 50 70 A
Switch On-
Resistance
RT9741A
R
DS(ON)
V
IN
= 5V, I
OUT
= 1.3A -- 100 120
m
RT9741C V
IN
= 5V, I
OUT
= 0.6A -- 120 140
Current Limit
RT9741A
I
LIM
V
OUT
= 4V
1.5 2 --
A
RT9741C 0.7 1 --
Short Current
RT9741A
I
SC_FB
V
OUT
= 0V, Measured Prior
to Thermal Shutdown
-- 1.4 --
A
RT9741C -- 0.7 --
Output Turn-On Rising Time T
ON_RISE
10% to 90% of V
OUT
Rising -- 200 -- s
Under-Voltage Lockout V
UVLO
V
IN
Rising 1.3 1.7 2.1 V
Under-Voltage Hysteresis V
UVLO
V
IN
Decreasing -- 0.1 -- V
Thermal Shutdown Protection T
SD
V
OUT
> 1V -- 120 --
C
V
OUT
= 0V -- 100 --
Thermal Shutdown Hysteresis T
SD
V
OUT
= 0V -- 20 -- C
Note 1. Stresses beyond those listed “Absolute Maximum Ratings” may cause permanent damage to the device. These are
stress ratings only, and 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 may affect
device reliability.
Note 2. θ
JA
is measured at T
A
= 25°C on a high effective thermal conductivity four-layer test board per JEDEC 51-7.
Note 3. Devices are ESD sensitive. Handling precaution is recommended.
Note 4. The device is not guaranteed to function outside its operating conditions.
