User Manual

AP8802
1A LED STEP-DOWN CONVERTER
AP8802
Document number: DS31766 Rev. 9 - 2
4 of 19
www.diodes.com
May 2012
© Diodes Incorporated
Electrical Characteristics (T
A
= +25°C, V
IN
= 12V; unless otherwise specified.)
Symbol Parameter Conditions Min Typ. Max Unit
I
OUT
Continuous switch current (Note 9) — — 1 A
I
Q
Quiescent Current — 75 120 μA
V
THD
Internal Threshold Voltage 184 200 216 mV
V
SENSEHYS
Sense threshold hysteresis — 15 — %
SET SET pin input current
V
SET
= V
IN
-0.2
— 5 — μA
V
REF
Internal Reference Voltage — 1.25 — V
R
DS(ON)
On Resistance of MOSFET
I
SW
= 0.8A
— 0.65 1.10 Ω
I
SW_LEAKAGE
Switch leakage current — — 8 μA
θ
JA
Thermal Resistance Junction-to-
Ambient
SO-8 (Note 10) — 82 — °C/W
SO-8EP (Note 10) — 45 — °C/W
U-DFN3030-10 (Note 10) — 38 — °C/W
θ
JC
Thermal Resistance Junction-to-Case
SO-8 (Note 10) — 52 — °C/W
SO-8EP (Note 10) — 7 — °C/W
U-DFN3030-10 (Note 10) — 24 — °C/W
Notes: 9. Refer to figure 8 for the device derating curve.
10. Test condition for SO-8, SO-8EP and U-DFN3030-10: Device mounted on FR-4 PCB, 2”x2”, 2oz 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.