RT7257D
Absolute Maximum Ratings (Note 1)
Supply Input Voltage, VIN ----------------------------------------------------------------------------------------- −0.3V to 20V
Switch Voltage, SW ------------------------------------------------------------------------------------------------ −0.3V to (VIN + 0.3V)
VBOOT − VSW ---------------------------------------------------------------------------------------------------------- −0.3V to 6V
Other Pins Voltage -------------------------------------------------------------------------------------------------- −0.3V to 20V
Power Dissipation, PD @ TA = 25°C
SOP-8 (Exposed Pad) --------------------------------------------------------------------------------------------- 1.333W
Package Thermal Resistance (Note 2)
SOP-8 (Exposed Pad), θJA ---------------------------------------------------------------------------------------- 75°C/W
SOP-8 (Exposed Pad), θJC --------------------------------------------------------------------------------------- 15°C/W
Lead Temperature (Soldering, 10 sec.)------------------------------------------------------------------------- 260°C
Junction Temperature ----------------------------------------------------------------------------------------------- 150°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 ----------------------------------------------------------------------------------------- 4.5V to 18V
Junction Temperature Range-------------------------------------------------------------------------------------- −40°C to 125°C
Ambient Temperature Range-------------------------------------------------------------------------------------- −40°C to 85°C
Electrical Characteristics
(VIN = 12V, TA = 25°C, unless otherwise specified)
Parameter
Shutdown Supply Current
Supply Current
Symbol
Test Conditions
Min
--
Typ
0.5
0.8
0.8
Max
3
Unit
A
mA
V
VEN = 0V
VEN = 3V, VFB = 0.9V
--
1.2
Reference Voltage
VREF
GEA
4.5V VIN 18V
0.788
0.812
Error Amplifier
IC = ±10A
--
--
--
940
110
90
--
--
--
A/V
m
Transconductance
High Side Switch
On-Resistance
Low Side Switch
On-Resistance
High Side Switch Leakage
Current
RDS(ON)1
RDS(ON)2
m
VEN = 0V, VSW = 0V
--
--
--
1
0
10
--
A
A
Upper Switch Current Limit
Min. Duty Cycle, VBOOT VSW = 4.8V
5.1
4.7
1.2
270
COMP to Current Sense
Transconductance
GCS
--
A/V
MHz
kHz
Oscillation Frequency
fOSC1
fOSC2
1.4
--
Short Circuit Oscillation
Frequency
VFB = 0V
--
Maximum Duty Cycle
Minimum On Time
DMAX
tON
VFB = 0.7V
--
--
78
--
--
%
100
ns
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is a registered trademark of Richtek Technology Corporation.
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4
DS7257D-05 October 2016
RICHTEK [ RICHTEK TECHNOLOGY CORPORATION ]
