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AL8805
Electrical Characteristics (V IN = 12, @T A = +25°C, unless otherwise specified.)
Symbol
V INSU
Parameter
Internal Regulator Start Up Threshold
V IN rising
Conditions
Min
Typ
Max
5.9
Unit
V
V INSH
Internal Regulator Hysteresis Threshold V IN falling
100
300
mV
I Q
Quiescent Current
Output not switching (Note 4)
350
μA
I S
V TH
V TH-H
I SET
R CTRL
V REF
R DS(on)
I SW_Leakage
f OSC
θ JA
Ψ JB
Input Supply Current
Set Current Threshold Voltage
Set Threshold Hysteresis
SET Pin Input Current
CTRL Pin Input Resistance
Internal Reference Voltage
On Resistance of SW MOSFET
Switch Leakage Current
Switching Frequency
Thermal Resistance Junction-to-
Ambient (Note 5)
Thermal Resistance Junction-to-Lead
(Note 7)
CTRL pin floating f = 250kHz
V SET = V IN -0.1
Referred to internal reference
I SW = 1A
V IN = 30V
SOT25 (Note 6)
SOT25
95
1.8
100
±20
16
50
2.5
0.25
250
50
5
105
22
0.4
0.5
1
mA
mV
mV
μA
k ?
V
?
μ A
MHz
° C/W
Notes:
4. AL8805 does not have a low power standby mode but current consumption is reduced when output switch is inhibited: V SENSE = 0V. Parameter is
tested with V CTRL ≤ 2.5V
5. Refer to figure 34 for the device derating curve.
6. Test condition for SOT25: Device mounted on FR-4 PCB (25mm x 25mm 1oz copper, minimum recommended pad layout on top layer and thermal
vias to bottom layer ground plane. For better thermal performance, larger copper pad for heat-sink is needed.
7 . As SOT25 doesn’t have an exposed tab or exposed pad the majority of heat flow is though pin 2 down to ground.
AL8805
Document number: DS35030 Rev. 4 - 2
3 of 16
www.diodes.com
July 2012
? Diodes Incorporated
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