Datasheet

LTM8031
3
8031fb
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: 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
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 PARAMETER CONDITIONS MIN TYP MAX UNITS
V
IN
Input DC Voltage
l
3.6 36 V
V
OUT
Output DC Voltage 0.2A < I
OUT
≤ 1A, R
ADJ
Open
0.2A < I
OUT
≤ 1A, R
ADJ
= 21.6k
0.8
10
V
V
I
OUT
Continuous Output DC Current V
IN
= 24V 1 A
I
Q(VIN)
V
IN
Quiescent Current V
RUN/SS
= 0.2V
V
BIAS
= 3V, Not Switching
V
BIAS
= 0V, Not Switching
l
0.6
25
88
60
120
µA
µA
µA
I
Q(BIAS)
BIAS Quiescent Current V
RUN/SS
= 0.2V
V
BIAS
= 3V, Not Switching
V
BIAS
= 0V, Not Switching
l
0.03
60
1
120
5
µA
µA
µA
∆V
OUT
V
OUT
Line Regulation 10V ≤ V
IN
≤ 36V, I
OUT
= 1A, V
OUT
= 3.3V 0.1 %
Load Regulation V
IN
= 24V, 0.2A ≤ I
OUT
≤ 1A, V
OUT
= 3.3V 0.3 %
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
Voltage at ADJ Pin
l
765 790 815 mV
V
BIAS(MIN)
Minimum BIAS Voltage for Proper Operation 1.9 2.8 V
I
ADJ
Current Out of ADJ Pin V
RUN/SS
= 0V, V
ADJ
= 0V, V
OUT
= 1V 4 µA
I
RUN/SS
RUN/SS Pin Current V
RUN/SS
= 2.5V 5 10 µA
V
IH(RUN/SS)
RUN/SS Input High Voltage 2.5 V
V
IL(RUN/SS)
RUN/SS Input Low Voltage 0.2 V
V
PG(TH)
ADJ Voltage Threshold for PGOOD to Switch 730 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
SYNC Input Low Threshold f
SYNC
= 550kHz 0.5 V
V
SYNCIH
SYNC Input High Threshold f
SYNC
= 550kHz 0.7 V
I
SYNC(BIAS)
SYNC Pin Bias Current V
SYNC
= 0V, V
BIAS
= 0V 0.1 µA
V
IN(RIPPLE)
550kHz Narrowband Conducted Emission
1MHz Narrowband Conducted Emission
3MHz Narrowband Conducted Emission
V
IN
= 24V, V
OUT
= 3.3V, I
OUT
= 1A, f
SW
= 550kHz,
5µH LISN
83
63
51
dBµV
dBµV
dBµV
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.