Compact, High-Efficiency, Dual-Output

Step-Up DC-DC Converter

4

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ELECTRICAL CHARACTERISTICS (continued)

PARAMETER

CONDITIONS

MIN

MAX

UNITS

FB Dual Mode Threshold

45

105

mV

Output Voltage Adjustment Range

2.5

5.5

V

Maximum LX On-Time

2.4

7.5

µs

Zero Crossing Comparator

040

mV

Zero Crossing Comparator

Backup Timer

22

70

µs

LX On-Resistance

0.65

Ω

LX Current Limit

0.42

1.05

A

LX Leakage Current

1

µA

ON Input Low Voltage

400

mV

ON Input High Voltage

1.6

V

ON Input Bias Current

1µA

LCD OUTPUT

LXLCD Voltage

28

V

LXLCD On-Resistance

2

Ω

LXLCD Current Limit

0.25

0.7

A

LXLCD Leakage Current

1

µA

FBLCD Regulation Voltage

1.20

1.30

V

FBLCD Input Bias Current

70

nA

Maximum LXLCD On-Time

4

14

µs

≥ 1.2V

0.5

1.5

Minimum LXLCD Off-Time

≤ 0.7V

2.2

7.5

µs

ONLCD Input Low Voltage

400

mV

ONLCD Input High Voltage

1.6

V

ONLCD Input Bias Current

1µA

Note 1: Specifications to -40°C are guaranteed by design and not production tested.