Electrical characteristics, Al8805 – Diodes AL8805 User Manual
Page 3
AL8805
Document number: DS35030 Rev. 4 - 2
3 of 16
July 2012
© Diodes Incorporated
AL8805
Electrical Characteristics
(V
IN
= 12, @T
A
= +25°C, unless otherwise specified.)
Symbol Parameter
Conditions Min
Typ
Max
Unit
V
INSU
Internal Regulator Start Up Threshold
V
IN
rising
5.9
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
Input Supply Current
CTRL pin floating f = 250kHz
1.8
5
mA
V
TH
Set Current Threshold Voltage
95
100
105
mV
V
TH-H
Set Threshold Hysteresis
±20
mV
I
SET
SET Pin Input Current
V
SET
= V
IN
-0.1
16
22
µA
R
CTRL
CTRL Pin Input Resistance
Referred to internal reference
50
k
Ω
V
REF
Internal Reference Voltage
2.5
V
R
DS(on)
On Resistance of SW MOSFET
I
SW
= 1A
0.25
0.4
Ω
I
SW_Leakage
Switch Leakage Current
V
IN
= 30V
0.5
μA
f
OSC
Switching Frequency
1
MHz
θ
JA
Thermal Resistance Junction-to-
Ambient (Note 5)
SOT25 (Note 6)
250
°C/W
Ψ
JB
Thermal Resistance Junction-to-Lead
(Note 7)
SOT25
50
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.