Linear Technology LTM8021, Manual, Page: 1 / 18

LTM8021
1
8021fd
For more information www.linear.com/LTM8021
Typical applicaTion
FeaTures
applicaTions
DescripTion
36V
IN
, 500mA
Step-Down DC/DC µModule
The LTM
®
8021 is a 36V
IN
500mA, step-down DC/DC
µModule
®
. Included in the package are the switching
controller, power switches, inductor, and all support
components. Operating over an input voltage range of 3V
to 36V, the LTM8021 supports an output voltage range of
0.8V to 5V, set by a single resistor. Only an output and
bulk input capacitor are needed to finish the design.
The low profile package (2.82mm) enables utilization of
unused space on the bottom of PC boards for high den-
sity point of load regulation. A built-in soft-start timer is
adjustable with just a resistor and capacitor.
The LTM8021 is packaged in a thermally enhanced,
compact (11.25mm
×
6.25mm) and low profile (2.82mm)
overmolded land grid array (LGA) package suitable
for automated assembly by standard surface mount
equipment. The LTM8021 is RoHS compliant.
7V
IN
to 36V
IN
, 5V/500mA µModule Regulator
n
Complete Switch Mode Power Supply
n
Wide Input Voltage Range: 3V to 36V
n
500mA Output Current
n
0.8V to 5V Output Voltage
n
Fixed 1.1MHz Switching Frequency
n
Current Mode Control
n
(e4) RoHS Compliant Package with Gold
Pad Finish
n
Programmable Soft-Start
n
Tiny, Low Profile (11.25mm × 6.25mm × 2.82mm)
Surface Mount LGA Package
n
Automotive Battery Regulation
n
Power for Portable Products
n
Distributed Supply Regulation
n
Industrial Supplies
n
Wall Transformer Regulation
Efficiency and Power Loss
LTM8021
8021 TA01a
V
IN
*
7V TO
36V
V
OUT
5V AT 500mA
1µF 2.2µF
19.1k
RUN/SS
IN
GND ADJ
BIAS
OUT
*RUNNING VOLTAGE RANGE. PLEASE REFER TO THE
APPLICATIONS INFORMATION SECTION FOR START-UP DETAILS.
0
POWER LOSS (mW)
100
200
300
450
400
50
150
250
350
8021 TA01b
LOAD CURRENT (mA)
1.00
30
EFFICIENCY (%)
40
50
70
60
10.00 100.00
90
80
1000.00
POWER
LOSS
EFFICIENCY
L
, LT, LTC, LTM, µModule, PolyPhase, Linear Technology and the Linear logo are registered
trademarks of Linear Technology Corporation. All other trademarks are the property of their
respective owners.