Datasheet

LTM8021
3
8021fc
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 LTM8021E is guaranteed to meet performance specifi cations
from 0°C to 125°C internal. Specifi cations over the full –40°C to 125°C
internal operating temperature range are assured by design, characteriza-
The l denotes the specifi cations which apply over the full operating temp-
erature range, otherwise specifi cations are at T
A
= 25°C, V
IN
= 10V, V
RUN/SS
= 10V, V
BIAS
= 3V, R
ADJ
= 31.6k.
tion and correlation with statistical process controls. The LTM8021I is
guaranteed to meet specifi cations over the full –40°C to 125°C internal
operating temperature range. Note that the maximum internal temperature
is determined by specifi c operating conditions in conjunction with board
layout, the rated package thermal resistance and other environmental
factors.
Note 3: Guaranteed by design.
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
V
OUT(DC)
DC Output Voltage V
IN
= 24V, 0 ≤ I
OUT
≤ 500mA
R
ADJ
= 31.6k, 0.1% 3.3 V
V
OUT(AC_RMS)
Output Voltage Ripple (RMS) V
IN
= 24V, I
OUT
= 250mA
C
OUT
= 2.2μF, V
BIAS
= V
OUT
1mV
f
SW
Switching Frequency I
OUT
= 500mA 0.9 1.1 1.3 MHz
I
OSC
Short-Circuit Output Current V
IN
= 36V, V
BIAS
= V
OUT
= 0V 900 mA
I
ISC
Short-Circuit Input Current V
IN
= 36V, V
BIAS
= V
OUT
= 0V 25 mA
ADJ Voltage at ADJ Pin R
ADJ
Open
l
0.79 0.80 0.83 V
V
BIAS(MIN)
Minimum BIAS Voltage for Proper
Operation
I
OUT
= 500mA 2.2 3 V
I
ADJ
Current Out of ADJ Pin V
OUT
= 5V, V
ADJ
= 0V, RUN/SS = 0V 50 μA
I
RUN/SS
RUN/SS Pin Current V
RUN/SS
= 2.5V, R
ADJ
Open 23 μA
V
IH(RUN/SS)
RUN/SS Input High Voltage R
ADJ
Open, I
OUT
= 500mA 1.6 V
V
IL(RUN/SS)
RUN/SS Input Low Voltage R
ADJ
Open, I
OUT
= 500mA 0.5 V
R
FB
Internal Feedback Resistor RUN/SS = V
BIAS
= V
ADJ
= 0V 100
kΩ