Datasheet

LTM8055/LTM8055-1
3
Rev C
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ELECTRICAL CHARACTERISTICS
The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. RUN = 1.5V unless otherwise noted. (Note 2)
PARAMETER CONDITIONS MIN TYP MAX UNITS
Minimum Input Voltage V
IN
= SV
IN
l
5.0 V
Output DC Voltage FB = V
OUT
Through 100k
R
FB
= 100k/3.40k
1.2
36
V
V
Output DC Current V
IN
= 6V, V
OUT
= 12V
V
IN
= 24V, V
OUT
= 12V
3
8.5
A
A
Quiescent Current Into V
IN
(Tied to SV
IN
) RUN = 0.3V (Disabled)
No Load, MODE = 0.3V (DCM)
No Load, MODE = 1.5V (FCM)
0.1
8
45
1
30
100
µ
A
mA
mA
Output Voltage Line Regulation 5V < V
IN
< 36V, I
OUT
= 1A 0.5 %
Output Voltage Load Regulation V
IN
= 12V, 0.1A < I
OUT
< 6A 0.5 %
Output RMS Voltage Ripple V
IN
= 12V, I
OUT
= 3A 25 mV
Switching Frequency R
T
= 453k
R
T
= 24.9k
100
800
kHz
kHz
Voltage at FB Pin
l
1.188
1.176
1.2 1.212
1.220
V
V
RUN
Falling Threshold LTM8055/LTM8055-1 Stops Switching
l
1.15 1.25 V
RUN Hysteresis LTM8055/LTM8055-1 Starts Switching 25 mV
RUN Low Threshold LTM8055/LTM8055-1 Disabled 0.3 V
RUN Pin Current RUN = 1V
RUN = 1.6V
2 3 5
100
µ
A
nA
I
IN
Bias Current 90 µA
Input Current Sense Threshold (I
IN
-V
IN
)
l
44 56 mV
I
OUT
Bias Current 20 µA
Output Current Sense Threshold (V
OUT
-I
OUT
) V
CTL
= Open
l
54.5
53
61.5
63
mV
mV
I
INMON
Voltage LTM8055/LTM8055-1 in Input Current Limit 0.96 1.04 V
I
OUTMON
Voltage LTM8055/LTM8055-1 in Output Current Limit 1.14 1.26 V
CTL Input Bias Current V
CTL
= 0V 22 µA
SS Pin Current V
SS
= 0V 35 µA
CLKOUT Output High 10k to GND 4 V
CLKOUT Output Low 10k to 5V 0.7 V
SYNC Input Low Threshold 0.3 V
SYNC Input High Threshold 1.5 V
SYNC Bias Current SYNC = 1V 11 µA
MODE Input Low Threshold 0.3 V
MODE Input High Threshold 1.5 V
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 LTM8055E/LTM8055E-1 is guaranteed to meet performance
specifications from 0°C to 125°C internal. Specifications over the full
–40°C to 125°C internal operating temperature range are assured by
design, characterization and correlation with statistical process controls.
The LTM8055I/LTM8055I-1 is guaranteed to meet specifications over
the full –40°C to 125°C internal operating temperature range. The
LTM8055MP/LTM8055MP-1 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.
Note 3: The LTM8055/LTM8055-1 contains
overtemperature protection
that
is intended to protect the device during momentary overload
conditions. The internal temperature exceeds the maximum operating
junction temperature when the overtemperature protection is active.
Continuous operation above the specified maximum operating junction
temperature may impair device reliability.
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