LTM8057
3
8057f
For more information www.linear.com/LTM8057
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: V
IN
+ V
OUT
is defined as the sum of (V
IN
– GND) + (V
OUT
– V
OUT
–
).
Note 3: The LTM8057 isolation is tested at 3kV DC for one second.
Note 4: The LTM8057E is guaranteed to meet performance specifications
from 0°C to 125°C. Specifications over the –40°C to 125°C internal
temperature range are assured by design, characterization and correlation
with statistical process controls. LTM8057I is guaranteed to meet
The l denotes the specifications which apply over the full internal
operating temperature range, otherwise specifications are at T
A
= 25°C, RUN = 12V (Note 4).
PARAMETER CONDITIONS MIN TYP MAX UNITS
Minimum Input DC Voltage BIAS = V
IN
, RUN = 2V
BIAS Open, RUN = 2V
l
l
3.1
4.3
V
V
V
OUT
DC Voltage R
ADJ
= 12.4k
R
ADJ
= 6.98k
R
ADJ
= 3.16k
l
4.75
2.5
5
12
5.25
V
V
V
V
IN
Quiescent Current V
RUN
= 0V
Not Switching
850
1 µA
µA
V
OUT
Line Regulation 6V ≤ V
IN
≤ 31V, I
OUT
= 0.15A, RUN = 2V 1.7 %
V
OUT
Load Regulation 0.05A ≤ I
OUT
≤ 0.2A, RUN = 2V 1.5 %
V
OUT
Ripple (RMS) I
OUT
= 0.1A, 1MHz BW 20 mV
Isolation Test Voltage (Note 3) 3000 V DC
Input Short-Circuit Current V
OUT
Shorted 30 mA
RUN Pin Input Threshold RUN Pin Rising 1.18 1.24 1.30 V
RUN Pin Current V
RUN
= 1V
V
RUN
= 1.3V
2.5
0.1
µA
µA
SS Threshold 0.7 V
SS Sourcing Current SS = 0V –10 µA
BIAS Current V
IN
= 12V, BIAS = 5V, I
LOAD
= 100mA 9 mA
Minimum BIAS Voltage (Note 5) I
LOAD
= 100mA 3.1 V
specifications over the full –40°C to 125°C internal operating temperature
range. The LTM8057MP is guaranteed to meet specifications over the
full –55°C to 125°C internal operating temperature range. Note that
the maximum internal temperature is determined by specific operating
conditions in conjunction with board layout, the rated package thermal
resistance and other environmental factors.
Test flowcharts are posted for viewing at:
www.linear.com/quality
Note 5: This is the BIAS pin voltage at which the internal circuitry is
powered through the BIAS pin and not the integrated regulator. See BIAS
Pin Considerations for details.
