4 ______________________________________________________________________________________

Step-Up Converter

for Handheld Applications

ELECTRICAL CHARACTERISTICS (continued)

design and characterization.

Note 4: Continuous operation with 1A at elevated ambient temperature and low voltage is not guaranteed. Under worst-case con-

ditions, die thermal protection cannot be activated after 100ms of 1A load application. See the continuous output current

Note 5: Switching frequency decreases if input voltage is > 83% of the output voltage selected. This allows duty factor to drop to

values necessary to boost output voltage less than 25% without the use of pulse widths less than 60ns.

Note 6: Contact factory for other options.

described in the conditions of the steady-state output voltage specification corresponds to the peak inductor current.

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

Output Voltage Ripple

20

Soft-Start Interval

Selection section

F

s

TRACK MODE

pMOSFET On-Resistance

130

mI

110

Track Current Limit

1

2

A

Track Mode Quiescent Current

EN = low, TREN = high

30

F

A

AUTOMATIC TRACK MODE (ATM)

ATM Supply Current

65

F

A

3.15

V

3.35

3.55

4.04

4.74

3.10

V

3.29

3.5

3.99

4.69

Boost to ATM Transition Time

(Note 7)

1

F

s

ATM to Boost Transition Time

1

F

s

LOGIC CONTROL

EN, TREN Logic Input High Voltage

1.05

V

EN, TREN Logic Input Low Voltage

0.4

V

EN, TREN Leakage Current

-1

0.01

+1

F

A

0.1