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RT7257J Datasheet(PDF) 4 Page - Richtek Technology Corporation

Part # RT7257J
Description  3A, 18V, 340kHz Synchronous Step-Down Converter
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Manufacturer  RICHTEK [Richtek Technology Corporation]
Direct Link  http://www.richtek.com
Logo RICHTEK - Richtek Technology Corporation

RT7257J Datasheet(HTML) 4 Page - Richtek Technology Corporation

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RT7257J
4
DS7257J-02
September 2012
www.richtek.com
Copyright
2012 Richtek Technology Corporation. All rights reserved.
is a registered trademark of Richtek Technology Corporation.
©
Electrical Characteristics
(VIN = 12V, TA = 25
°C, unless otherwise specified)
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
Parameter
Symbol
Test Conditions
Min
Typ
Max
Unit
Shutdown Supply Current
VEN = 0V
--
0.5
3
μA
Supply Current
VEN = 3 V, VFB = 0.9V
--
0.8
1.2
mA
Reference Voltage
VREF
4.5V
≤ VIN ≤ 18V
0.788
0.8
0.812
V
Error Amplifier
Transconductance
GEA
ΔIC = ±10μA
--
940
--
μA/V
High Side Switch
On-Resistance
RDS(ON)1
--
110
--
m
Ω
Low Side Switch
On-Resistance
RDS(ON)2
--
90
--
m
Ω
High Side Switch Leakage
Current
VEN = 0V, VSW = 0V
--
0
10
μA
Upper Switch Current Limit
Min. Duty Cycle, VBOOT − VSW = 4.8V
--
5.1
--
A
COMP to Current Sense
Transconductance
GCS
--
4.7
--
A/V
Oscillation Frequency
fOSC1
300
340
380
kHz
Short Circuit Oscillation
Frequency
fOSC2
VFB = 0V
--
100
--
kHz
Maximum Duty Cycle
DMAX
VFB = 0.7V
--
93
--
%
Minimum On Time
tON
--
100
--
ns


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