RT9272 Просмотр технического описания (PDF) - Richtek Technology
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RT9272 Datasheet PDF : 11 Pages
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RT9272
Preliminary
Absolute Maximum Ratings (Note 1)
z Input Supply Voltage -------------------------------------------------------------------------------------------------- −0.3V to 6V
z LX ------------------------------------------------------------------------------------------------------------------------- −0.3V to 18V
z CH1, CH2, and OVP -------------------------------------------------------------------------------------------------- −0.3V to 18V
z The Other Pins --------------------------------------------------------------------------------------------------------- −0.3V to 6V
z Power Dissipation, PD @ TA = 25°C, TJ = 125°C
VDFN-10L 3x3 ---------------------------------------------------------------------------------------------------------- 2.083W
z Package Thermal Resistance (Note 2)
VDFN-10L 3x3, θJA ---------------------------------------------------------------------------------------------------- 48°C/W
z Operating Junction Temperature Range -------------------------------------------------------------------------- −40°C to 85°C
z Storage Temperature Range ---------------------------------------------------------------------------------------- −65°C to 150°C
z Lead Temperature (Soldering, 10 sec.) --------------------------------------------------------------------------- 260°C
Recommended Operating Conditions (Note 3)
z Input Supply Voltage -------------------------------------------------------------------------------------------------- 2.7V to 4.5V
z Output Voltage --------------------------------------------------------------------------------------------------------- Under 16V
z Output Current --------------------------------------------------------------------------------------------------------- Under 80mA
Electrical Characteristics
(VIN = 3.7V, TA = 25°C, Unless Otherwise specification)
Parameter
Symbol
Test Condition
System Supply
Supply Current
Shut Down Current
Maximum Duty Cycle
Reference Voltage
Feedback Voltage 1
Feedback Voltage 2
Power Switch MOSFET
On Resistance of MOSFET
Current Limitation
Internal MOSFET Selection
On Resistance of CH1 MOSFET
On Resistance of CH2 MOSFET
SP Low Level Voltage
SP High Level Voltage
SP signal change delay time
Protection
ICC
ICC
VFB1
VFB2
RDS(ON)
IMAX
RDS(ON)
RDS(ON)
VSP
VSP
RDS(ON)
VCC=3.7V, Switching, VFB=0V
VCC=3.7V, VEN<0.4V
Normal Operation
LX off time as SP change
OVP Threshold
Over Temperature Protection
Shut Down Voltage
Enable Voltage
OVP
OTP
VEN
VEN
Min
--
--
85
0.285
0.285
--
--
--
--
--
1.5
--
16
--
--
1.5
Typ
--
--
90
0.300
0.300
0.5
1.5
6
4.0
--
--
0.5
17
170
--
--
Max
2
1
--
0.315
0.315
1
--
9
6
0.4
--
1
19
--
0.4
--
Units
mA
uA
%
V
V
Ω
A
Ω
Ω
V
V
ms
V
°C
V
V
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DS9272-09 August 2007
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