RT4503/A
Absolute Maximum Ratings (Note 1)
VIN ---------------------------------------------------------------------------------------------------------------------- −0.3V to 6V
EN, FB, COMP to GND -------------------------------------------------------------------------------------------- −0.3V to (VIN + 0.3V)
LXtoGND ------------------------------------------------------------------------------------------------------------- −0.3V to 38V
Power Dissipation, PD @ TA = 25°C
WDFN-6L 2x2 -------------------------------------------------------------------------------------------------------- 2.1W
Package Thermal Resistance (Note 2)
WDFN-6L 2x2, θJA --------------------------------------------------------------------------------------------------- 47.5°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
MM (Machine Model) ----------------------------------------------------------------------------------------------- 200V
Recommended Operating Conditions (Note 4)
Supply Input Voltage, VIN ------------------------------------------------------------------------------------------ 2.5V to 5.5V
Junction Temperature Range-------------------------------------------------------------------------------------- −40°C to 125°C
Ambient Temperature Range-------------------------------------------------------------------------------------- −40°C to 85°C
Electrical Characteristics
(VIN = 3.6V, CIN = 2.2μF, COUT = 1μF, L = 22μH, fSW = 550kHz, TA = 25°C, unless otherwise specified)
Parameter
Power Supply
IC Operating Current (switching)
Symbol
Test Conditions
Min
Typ
Max
Unit
IQ_SW
VFB = 0V
0.25
0.25
--
0.8
0.35
0.3
1.5
0.5
1
mA
mA
A
V
IC Quiescent Current (non-switching) IQ
VFB = 0.4V
VIN Pin Shutdown Current
ISHDN
UVLO
EN = GND
Under-Voltage Lockout Threshold
Under-Voltage Lockout Hysteresis
Enable and Reference Control
VIN Rising Edge
2.25
--
2.37
80
2.5
--
UVLO_hys VIN Falling Edge
mV
Logic-High
EN Input Voltage
VIH
VIL
1.4
--
--
--
--
0.4
--
V
Logic-Low
EN Pull Low Resistance
REN
--
300
--
k
ms
ms
s
Toff
Toff
For RT4503
20
2
--
EN minimum Shut down Pulse Width
For RT4503A
--
--
EN Minimum Logic High Pulse Width THigh_MIN
EN Minimum Logic Low Pulse Width TLow
0.5
0.5
--
--
--
--
1000
--
s
Internal Comp Resistance
Rcomp
DPWM MIN For RT4503, VFB > 0mV
fPWM For RT4503
120
k
PWM Minimum Duty without IC
Shutdown
1
1
--
--
--
%
PWM Frequency
100
kHz
Copyright 2015 Richtek Technology Corporation. All rights reserved.
©
is a registered trademark of Richtek Technology Corporation.
DS4503/A-03 June 2015
www.richtek.com
4
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