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LTM8031
ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T A = 25°C. V IN = 10V, V RUN/SS = 10V, V BIAS = 3V, unless otherwise specified.
SYMBOL
V IN
PARAMETER
Input DC Voltage
CONDITIONS
l
MIN
3.6
TYP
MAX
36
UNITS
V
V OUT
I OUT
Output DC Voltage
Continuous Output DC Current
0.2A < I OUT ≤ 1A, R ADJ Open
0.2A < I OUT ≤ 1A, R ADJ = 21.6k
V IN = 24V
0.8
10
1
V
V
A
I Q(VIN)
I Q(BIAS)
? V OUT
V OUT
V IN Quiescent Current
BIAS Quiescent Current
Line Regulation
Load Regulation
V RUN/SS = 0.2V
V BIAS = 3V, Not Switching
V BIAS = 0V, Not Switching
V RUN/SS = 0.2V
V BIAS = 3V, Not Switching
V BIAS = 0V, Not Switching
10V ≤ V IN ≤ 36V, I OUT = 1A, V OUT = 3.3V
V IN = 24V, 0.2A ≤ I OUT ≤ 1A, V OUT = 3.3V
l
l
0.6
25
88
0.03
60
1
0.1
0.3
60
120
120
5
μA
μA
μA
μA
μA
μA
%
%
V OUT(AC_RMS) Output Ripple (RMS)
V IN = 24V, I OUT = 1A, V OUT = 3.3V
6
mV
f SW
Switching Frequency
R T = 113k
325
kHz
V ADJ
V BIAS(MIN)
I ADJ
I RUN/SS
Voltage at ADJ Pin
Minimum BIAS Voltage for Proper Operation
Current Out of ADJ Pin
RUN/SS Pin Current
V RUN/SS = 0V, V ADJ = 0V, V OUT = 1V
V RUN/SS = 2.5V
l
765
790
1.9
4
5
815
2.8
10
mV
V
μA
μA
V IH(RUN/SS)
V IL(RUN/SS)
V PG(TH)
RUN/SS Input High Voltage
RUN/SS Input Low Voltage
ADJ Voltage Threshold for PGOOD to Switch
2.5
730
0.2
V
V
mV
I PGO
PGOOD Leakage
V PG = 30V
0.1
1
μA
I PGSINK
PGOOD Sink Current
V PG = 0.4V
200
800
μA
V SYNCIL
V SYNCIH
I SYNC(BIAS)
V IN(RIPPLE)
SYNC Input Low Threshold
SYNC Input High Threshold
SYNC Pin Bias Current
550kHz Narrowband Conducted Emission
1MHz Narrowband Conducted Emission
3MHz Narrowband Conducted Emission
f SYNC = 550kHz
f SYNC = 550kHz
V SYNC = 0V, V BIAS = 0V
V IN = 24V, V OUT = 3.3V, I OUT = 1A, f SW = 550kHz,
5μH LISN
0.7
0.1
83
63
51
0.5
V
V
μA
dBμV
dBμV
dBμV
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 LTM8031E is guaranteed to meet performance specifications
from 0°C to 125°C internal. Specifications over the –40°C to 125°C
internal temperature range are assured by design, characterization and
correlation with statistical process controls. The LTM8031I is guaranteed
to meet specifications over the full –40°C to 125°C internal operating
temperature range. The LTM8031MP 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: See Linear Technology Application Note 100.
8031fb
3
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