Datasheet

LTC3459
3
3459fc
ELECTRICAL CHARACTERISTICS
Note 1: Stresses beyond those listed under Absolute Maximum Ratings
may cause permanent damage to the device. Exposure to any Absolute
Maximum Rating condition for extended periods may affect device
reliability and lifetime.
Note 2: The LTC3459E is guaranteed to meet performance specifi cations
from 0°C to 85°C. Specifi cations over the –40°C to 85°C operating
temperature range are assured by design, characterization and correlation
with statistical process controls.
PARAMETER CONDITIONS MIN TYP MAX UNITS
V
IN
Input Voltage Range
l
1.5 5.5 V
V
IN
Quiescent Current SHDN = V
CC
10 20 μA
V
IN
Shutdown Current SHDN = GND 0.1 1 μA
V
OUT
Programmable Voltage Range
l
2.5 10 V
V
OUT
Quiescent Supply Current SHDN = V
CC
24 μA
V
OUT
Shutdown Current SHDN = GND 0.1 1 μA
Reference
Feedback Voltage V
IN
= 3.3V, V
OUT
= 7.5V
l
1.19 1.22 1.25 V
FB Input Leakage Current Measured on FB 10 50 nA
Converter Performance
Peak Switch Current (V
IN
= 3.3V) L = 22μH
l
60 75 90 mA
t
OFF
Timer (V
IN
= 3.3V, V
OUT
= 5V) Varies by 1/(V
OUT
– V
IN
) 225 400 550 ns
Zero Current Comparator Threshold L = 22μH 0 mA
Main NMOS Switch
On-Resistance V
OUT
= 5V 2.8 Ω
Leakage Current V
SWITCH
= 10V, V
OUT
= 10V 0.01 1 μA
Main PMOS Switch
On-Resistance V
OUT
= 5V 4.2 Ω
Leakage Current V
IN
= 5V, V
SWITCH
= 5V, V
OUT
= 0V 0.02 2 μA
Logic Inputs
SHDN Threshold (Rising Edge) 0.3 1 V
SHDN Hysteresis 80 mV
SHDN Input Leakage Current SHDN = 3.3V 0 50 nA
The l denotes the specifi cations which apply over the full operating
temperature range, otherwise specifi cations are at T
A
= 25°C. V
IN
= 3.3V, V
OUT
= 5V, unless otherwise noted.
Note 3: This IC includes overtemperature protection that is intended
to protect the device during momentary overload conditions. Junction
temperature will exceed 125°C when overtemperature protection is active.
Continuous operation above the specifi ed maximum operating junction
temperature may impair device reliability.