RT7241A
Parameter
Switching Frequency
Minimum On Time
Minimum Off Time
Symbol
f
SW
t
ON
t
OFF
Measured at FB, with respect to
reference voltage
FB force above OVP threshold
Measured at FB, with respect to
reference voltage
FB force below UVP threshold
Test Conditions
Min
425
--
--
Typ
500
60
200
Max
575
--
--
Unit
kHz
ns
ns
Switching Frequency and Min. Off Timer
Output Under-Voltage and Over-Voltage Protection
OVP Trip Threshold
OVP Propagation Delay
UVP Trip Threshold
UVP Propagation Delay
Reference and Soft-Start
FB Reference Voltage
FB Input Bias Current
Soft-Start Time
Enable and UVLO
S3, S5 Input
Voltage
Logic-High
Logic-Low
Wake up
Shutdown
Measured at FB, with respect to
reference, no load
Falling edge, FB forced below
PGOOD trip threshold
I
SINK
= 1mA
I
LEAK
T
SD
High state, forced to 5V
0.8
--
3.9
--
--
--
4.2
0.2
--
0.4
4.5
--
V
V
V
t
SS
V
REF
V
FB
= 0.6V
From S5 high to 90% of V
REF
0.594
1
0.5
0.6
0.1
1
0.606
1
1.5
V
A
ms
V
OVP
T
OVPDLY
V
UVP
T
UVPDLY
112
--
60
--
117
5
70
2
122
--
80
--
%
s
%
s
VDD Input UVLO Threshold
VDD Input UVLO Hysteresis
Power Good
Trip Threshold (Raising)
Trip Threshold (Hysteresis)
Fault Propagation Delay
Output Low Voltage
Leakage Current
Thermal Shutdown
Thermal Shutdown
87
--
--
--
--
--
--
91
3
2.5
--
--
165
25
95
--
--
0.4
1
--
--
%
%
s
V
A
C
C
Thermal Shutdown Hysteresis
T
SD
VTT LDO
VDDQ = VLDOIN = 1.2V / 1.35V /
1.5V / 1.8V, |IVTT| = 0A
VDDQ = VLDOIN = 1.2V / 1.35V /
1.5V / 1.8V, |IVTT| = 1A
VDDQ = VLDOIN = 1.2V / 1.35V,
|IVTT| = 1.2A
VDDQ = VLDOIN = 1.5V / 1.8V,
|IVTT| = 1.5A
20
30
40
40
--
--
--
--
20
30
mV
40
40
VTT Output Tolerance
V
VTTTOL
Copyright
©
2017 Richtek Technology Corporation. All rights reserved.
is a registered trademark of Richtek Technology Corporation.
DS7241A-02 January 2017
www.richtek.com
5
RICHTEK [ RICHTEK TECHNOLOGY CORPORATION ]
