LTC3025EDC#TRM Linear Technology, LTC3025EDC#TRM Datasheet - Page 9

• Manufacturer Part Number: LTC3025EDC#TRM
• Description: IC REG VLDO 300MA MICROPWR 6DFN
• Manufacturer: Linear Technology

Specifications of LTC3025EDC#TRM

• Regulator Topology: Positive Adjustable
• Voltage - Output: 0.4 ~ 3.6 V
• Voltage - Input: 0.9 ~ 5.5 V
• Voltage - Dropout (typical): 0.045V @ 300mA
• Number Of Regulators: 1
• Current - Output: 300mA (Min)
• Operating Temperature: -40°C ~ 125°C
• Mounting Type: Surface Mount
• Package / Case: 6-DFN
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Current - Limit (min): -
• Other names: LTC3025EDC; LTC3025EDC

200mV/DIV
APPLICATIONS INFORMATION
The LTC3025 will cycle in and out of thermal shutdown
without latch-up or damage until the overstress condition
is removed. Long term overstress (T
avoided as it can degrade the performance or shorten the
life of the part.
Soft-Start Operation
The LTC3025 includes a soft-start feature to prevent
excessive current fl ow during start-up. When the LDO is
enabled, the soft-start circuitry gradually increases the LDO
reference voltage from 0V to 0.4V over a period of about
600μs. There is a short 700μs delay from the time the
part is enabled until the LDO output starts to rise. Figure 5
shows the start-up and shutdown output waveform.
SHDN
V
OUT
1.2V
OFF
ON
0V
T
V
V
C
R
Figure 5. Output Start-Up and Shutdown
A
IN
BIAS
OUT
LOAD
= 25°C
= 1.5V
= 1μF
= 3.6V
= 4Ω
500μs/DIV
J
> 125°C) should be
3025 F05
V
During power-up, the output shutdown circuitry is not
active below V
the output voltage can drift up during power-up due to
leakage current (<1 mA typical) from V
input, the shutdown circuitry is active and the output is
actively held off. This usually causes no circuit problems
and is similar to 3-terminal regulators such as the LT3080,
LT1086 and LT317 which have no ground pin and can have
the output rise under some conditions. A slowly rising
V
ramping of V
V
With fast rising inputs (>1V/ms) or with suffi cient resis-
tive load on V
reduced or eliminated. Such conditions also reduce or
eliminate non-monotonic initial power-up with the part
enabled. If V
current from V
circuitry is active at a V
to minimize V
before V
in shutdown or it is actively held on when enabled under
all conditions.
OUT
IN
IN
of about 0.65V (typical) as well.
with the part enabled may result in non-monotonic
Start-Up and Supply Sequencing
BIAS
. At V
BIAS
OUT
OUT
OUT
IN
IN
to V
of about 0.65V DC (typical). As a result,
due to LDO circuitry becoming active at
is sequenced up before V
, output voltage rise during power-up is
IN
rise during start-up, sequence up V
= 0.9V, the output is actively held off
OUT
IN
may increase until the shutdown
of about 0.65V typical. Thus,
IN
LTC3025
to V
IN
, the leakage
OUT
. At 0.9V
3025fd
9
IN