Page No. : 3/8
DS-AX1509-01 Aug, 2006
www.Orister.com
All Output Voltage Versions Electrical Characteristics
Specifications with boldface type apply over for full operating temperature range, the other type are for TJ=25
oC
(Unless otherwise specified, VIN=12V for the 3.3V, 5V, and adjustable version and VIN=18V for the 12V version, ILOAD=500mA)
Parameter
Symbol
Test Condition
Min.
Typ.
Max.
Unit
Device Parameters
Feedback Bias Current
Ib
Adjustable Version Only, VFB=1.3V
-
-10
-50
-100
nA
Oscillator Frequency
fO
(Note 5)
120
110
150
173
173
KHz
Saturation Voltage
VSAT
IOUT=2A
(Note 6,7)
-
1.3
1.4
1.5
V
Max. Duty Cycle (ON)
Min. Duty Cycle (OFF)
DC
(Note 7)
(Note 8)
-
100
0
-
%
Current Limit
ICL
Peak Current
(Note 6,7)
3.6
4.5
6.5
7.5
A
Output Leakage Current
IL
Output=0V
(Note 6,8)
-
-
-50
uA
Quiescent Current
IQ
(Note 8)
-
5
10
mA
Standby Quiescent Current
ISTBY
ON/OFF pin=5V
(Note 9)
-
150
250
300
uA
DIP-8
-
14
-
θJC
SOP-8
Junction to
Case
-
15
-
oC/W
DIP-8
-
80
-
Thermal Resistance
θJA(Note 10)
SOP-8
Junction to
ambient
-
70
-
oC/W
ON/OFF Control
VIH
Low (Regulator ON)
-
0.6
ON/OFF Pin Logic Input Threshold
Voltage
VIL
High (Regulator OFF)
2.0
1.3
-
V
IIH
VLOGIC=2.5V (Regulator OFF)
-
-5
-15
ON/OFF Pin Input Current
IIL
VLOGIC=0.5V (Regulator ON)
-
-0.02
-5
uA
Note 1: Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Operating Ratings indicate conditions for which
the device is intended to be functional, but do not guarantee specific performance limits. For guaranteed specifications and test conditions,
see the Electrical Characteristics.
Note 2: External components such as the catch diode, inductor, input and output capacitors, and voltage programming resistors can affect
switching regulator system performance.
Note 3: Typical numbers are at 25
oC and represent the most likely norm.
Note 4: All limits guaranteed at room temperature (standard type face) and at temperature extremes (bold type face). All room temperature limits
are 100% production tested. All limits at temperature extremes are guaranteed via correlation using standard Statistical Quality Control
(SQC) methods. All limits are used to calculate Average Outgoing Quality Level (AOQL).
Note 5: The switching frequency is reduced when the second stage current limit is activated.
Note 6: No diode, inductor or capacitor connected to output pin.
Note 7: Feedback pin removed from output and connected to 0V to force the output transistor switch ON.
Note 8: Feedback pin removed from output and connected to 12V for the 3.3V, 5V, ADJ. version, and 15V for the 12V version, to force the output
transistor switch OFF.
Note 9: VIN=22V.
Note 10: Junction to ambient thermal resistance. (With copper area of approximately 3in
2)
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