LTC3026 LINER [Linear Technology], LTC3026 Datasheet - Page 12

• Manufacturer Part Number: LTC3026
• Description: 1.5A Low Input Voltage VLDO Linear Regulator
• Manufacturer: LINER [Linear Technology]

LTC3026
OPERATIO
Short-Circuit/Thermal Protection
The LTC3026 has built-in output short-circuit current
limiting as well as over temperature protection. During
short-circuit conditions, internal circuitry automatically
limits the output current to approximately 3A. At higher
temperatures, or in cases where internal power dissipa-
tion cause excessive self heating on-chip, the thermal
shutdown circuitry will shut down the boost converter and
LDO when the junction temperature exceeds approxi-
mately 150°C. It will reenable the converter and LDO once
the junction temperature drops back to approximately
140°C. The LTC3026 will cycle in and out of thermal
shutdown without latch-up or damage until the overstress
condition is removed. Long term overstress (T
should be avoided as it can degrade the performance or
shorten the life of the part.
12
U
Figure 6. Input Current vs Input Voltage
–10
–20
–30
30
20
10
0
0
J
> 125°C)
0.3
INPUT VOLTAGE (V)
0.6
LIMIT ABOVE 1.45V
IN CURRENT
0.9
Reverse Input Current Protection
The LTC3026 features reverse input current protection to
limit current draw from any supplementary power source
at the output. Figure 6 shows the reverse output current
limit for constant input and output voltages cases. Note:
Positive input current represents current flowing into the
V
With V
and V
curves. I
V
as V
reverse current protection circuitry is disabled and normal
operation resumes. As V
reverse current transitions into short circuit current as
long as V
IN
IN
approaches V
pin of LTC3026.
1.2
IN
IN
OUT
approaches within about 30mV of V
IN
varied, IN current flow will follow Figure 6’s
1.5
OUT
held at or below the output regulation voltage
reverse current ramps up to about 16µA as the
3026 F06
is held below the regulation voltage.
1.8
OUT
. Reverse input current will spike up
IN
transitions above V
OUT
OUT
as the
3026f
the