RT7257C Просмотр технического описания (PDF) - Richtek Technology
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RT7257C Datasheet PDF : 14 Pages
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RT7257C
Absolute Maximum Ratings (Note 1)
z Supply Input Voltage, VIN ------------------------------------------------------------------------------------------ −0.3V to 20V
z Switch Voltage, SW ------------------------------------------------------------------------------------------------ −0.3V to (VIN + 0.3V)
z VBOOT − VSW ---------------------------------------------------------------------------------------------------------- −0.3V to 6V
z Other Pins Voltage ------------------------------------------------------------------------------------------------- −0.3V to 20V
z Power Dissipation, PD @ TA = 25°C
SOP-8 (Exposed Pad) --------------------------------------------------------------------------------------------- 1.333W
z Package Thermal Resistance (Note 2)
SOP-8 (Exposed Pad), θJA ---------------------------------------------------------------------------------------- 75°C/W
SOP-8 (Exposed Pad), θJC --------------------------------------------------------------------------------------- 15°C/W
z Lead Temperature (Soldering, 10 sec.) ------------------------------------------------------------------------- 260°C
z Junction Temperature ----------------------------------------------------------------------------------------------- 150°C
z Storage Temperature Range -------------------------------------------------------------------------------------- −65°C to 150°C
z ESD Susceptibility (Note 3)
HBM (Human Body Model) ---------------------------------------------------------------------------------------- 2kV
Recommended Operating Conditions (Note 4)
z Supply Input Voltage, VIN ------------------------------------------------------------------------------------------ 4.5V to 18V
z Junction Temperature Range -------------------------------------------------------------------------------------- −40°C to 125°C
z Ambient Temperature Range -------------------------------------------------------------------------------------- −40°C to 85°C
Electrical Characteristics
(VIN = 12V, TA = 25°C, unless otherwise specified)
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
Error Amplifier
Transconductance
High Side Switch
On-Resistance
Low Side Switch
On-Resistance
High Side Switch Leakage
Current
VREF
GEA
RDS(ON)1
RDS(ON)2
4.5V ≤ VIN ≤ 18V
ΔIC = ±10μA
VEN = 0V, VSW = 0V
0.788 0.8 0.812 V
-- 940 -- μA/V
-- 110 -- mΩ
--
90
-- mΩ
--
0
10 μA
Upper Switch Current Limit
COMP to Current Sense
Transconductance
GCS
Min. Duty Cycle, VBOOT − VSW = 4.8V --
5.1
--
A
--
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
Copyright ©2012 Richtek Technology Corporation. All rights reserved.
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is a registered trademark of Richtek Technology Corporation.
DS7257C-02 September 2012
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