RT8004
Parameter
Switching Frequency
Sync Frequency Range
Switch On Resistance, High
Switch On Resistance, Low
Peak Current Limit
Undervoltage Lockout Threshold
SW Leakage Current
EN/SS Leakage Current
Enable Threshold
V
EN
R
PFET
R
NFET
I
LIM
VDD Rising
Hysteresis
V
EN
= 0V, V
IN
= 5.5V
Symbol
f
OSC
Test Conditions
R
OSC
= 309k
Switching Frequency Range
(Note 6)
I
SW
= 1A
I
SW
= 1A
Min
0.8
0.3
0.3
45
45
4
2.25
--
--
--
0.65
Typ
1
--
--
75
69
5.2
2.52
0.15
--
--
--
Max
1.2
4
4
110
100
7
2.7
--
1
1
0.95
Units
MHz
MHz
MHz
mΩ
mΩ
A
V
V
μA
μA
V
Note 1.
Stresses listed as the above
“Absolute
Maximum Ratings” may cause permanent damage to the device. These are for
stress ratings. Functional operation of the device at these or any other conditions beyond those indicated in the
operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended
periods may remain possibility to affect device reliability.
Note 2.
Devices are ESD sensitive. Handling precaution recommended.
Note 3.
The device is not guaranteed to function outside its operating conditions.
Note 4.
θ
JA
is measured in the natural convection at T
A
= 25°C on
4-layers high effective thermal conductivity test board of
JEDEC 51-7 thermal measurement standard. The case point of
θ
JC
is on the expose pad for the QFN package.
Note 5.
The specifications over the -40°C to 85°C operation ambient temperature range are assured by design, characterization
and correlation with statistical process controls.
Note 6.
The external synchronous frequency must be equal to 1 to 1.3 times of the internal setting frequency. The switching
frequency reange is guaranteed by design but not production tested.
DS8004-03
September 2007
www.richtek.com
7
RICHTEK [ RICHTEK TECHNOLOGY CORPORATION ]
