RT9272
Absolute Maximum Ratings
Preliminary
(Note 1)
Input Supply Voltage --------------------------------------------------------------------------------------------------
−
0.3V to 6V
LX -------------------------------------------------------------------------------------------------------------------------
−
0.3V to 18V
CH1, CH2, and OVP --------------------------------------------------------------------------------------------------
−
0.3V to 18V
The Other Pins ---------------------------------------------------------------------------------------------------------
−
0.3V to 6V
Power Dissipation, P
D
@ T
A
= 25°C, T
J
= 125°C
VDFN-10L 3x3 ---------------------------------------------------------------------------------------------------------- 2.083W
Package Thermal Resistance (Note 2)
VDFN-10L 3x3,
θ
JA
---------------------------------------------------------------------------------------------------- 48°C/W
Operating Junction Temperature Range --------------------------------------------------------------------------
−
40°C to 85°C
Storage Temperature Range ----------------------------------------------------------------------------------------
−
65°C to 150°C
Lead Temperature (Soldering, 10 sec.) --------------------------------------------------------------------------- 260°C
Recommended Operating Conditions
(Note 3)
Input Supply Voltage -------------------------------------------------------------------------------------------------- 2.7V to 4.5V
Output Voltage --------------------------------------------------------------------------------------------------------- Under 16V
Output Current --------------------------------------------------------------------------------------------------------- Under 80mA
Electrical Characteristics
(V
IN
= 3.7V, T
A
= 25°C, Unless Otherwise specification)
Parameter
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
OVP Threshold
Over Temperature Protection
Shut Down Voltage
Enable Voltage
Symbol
I
CC
I
CC
Test Condition
V
CC
=3.7V, Switching, V
FB
=0V
V
CC
=3.7V, V
EN
<0.4V
Min
--
--
85
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
V
FB1
V
FB2
R
DS(ON)
I
MAX
R
DS(ON)
R
DS(ON)
V
SP
V
SP
R
DS(ON)
OVP
OTP
V
EN
V
EN
LX off time as SP change
Normal Operation
0.285
0.285
--
--
--
--
--
1.5
--
16
--
--
1.5
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DS9272-09 August 2007
RICHTEK [ RICHTEK TECHNOLOGY CORPORATION ]
