Datasheet

LTM8021
3
8021fd
For more information www.linear.com/LTM8021
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 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,
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, R
ADJ
= 31.6k.
characterization and correlation with statistical process controls. The
LTM8021I is guaranteed to meet specifications over the full –40°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: 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
1 mV
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
kW