Rainbow Electronics MAX1817 - Manual (Page 4)

MAX1817
Compact, High-Efficiency, Dual-Output
Step-Up DC-DC Converter
4 _______________________________________________________________________________________
ELECTRICAL CHARACTERISTICS (continued)
(V ON = V ONLCD = V OUT = +3.3V, FB = GND, T A = -40°C to +85°C, unless otherwise noted.) (Note 1)
PARAMETER CONDITIONS MIN MAX UNITS
FB Dual Mode Threshold 45 105 mV
Outp ut V ol tag e Ad j ustm ent Rang e 2.5 5.5 V
Maximum LX On-Time V FB = 0.5V 2.4 7.5 µs
Zero Crossing Comparator
Threshold (V
LX - V OUT )
0 40 mV
Zero Crossing Comparator
Backup Timer
V FB = 0.5V 22 70 µs
LX On-Resistance V OUT = 3.3V, I LX = 100mA 0.65 Ω
LX Current Limit 0.42 1.05 A
LX Leakage Current V ON = GND, V LX = 5.5V 1 µA
ON Input Low Voltage 1.8V < V OUT < 5.5V, V FB = 0.5V 400 mV
ON Input High Voltage 1.8V < V OUT < 5.5V, V FB = 0.5V 1.6 V
ON Input Bias Current 1 µA
LCD OUTPUT
LXLCD Voltage 28 V
LXLCD On-Resistance V
OUT
= 3.3V, I
LXLCD
= 100mA 2 Ω
LXLCD Current Limit 0.25 0.7 A
LXLCD Leakage Current V LXLCD = 28V, V ONLCD = 0 1 µA
FBLCD Regulation Voltage 1.20 1.30 V
FBLCD Input Bias Current V FBLCD = 1.35V 70 nA
Maximum LXLCD On-Time 4 14 µs
V FBLCD
≥ 1.2V 0.5 1.5
Minimum LXLCD Off-Time
V FBLCD
≤ 0.7V 2.2 7.5
µs
ONLCD Input Low Voltage 2.5V < V OUT < 5.5V 400 mV
ONLCD Input High Voltage 2.5V < V OUT < 5.5V 1.6 V
ONLCD Input Bias Current 1 µA
Note 1: Specifications to -40°C are guaranteed by design and not production tested.