Linear Technology LTM8021 Manual

FeaTures
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
n
Pad Finish
Programmable Soft-Start
n
Tiny, Low Profile (11.25mm × 6.25mm × 2.82mm)
n
Surface Mount LGA Package
applicaTions
Automotive Battery Regulation
n
Power for Portable Products
n
Distributed Supply Regulation
n
Industrial Supplies
n
Wall Transformer Regulation
n
Typical applicaTion
7V to 36V , 5V/500mA µModule Regulator
IN IN
LTM8021
V *
IN
7V TO
IN
36V
RUN/SS
GND
1µF
*RUNNING VOLTAGE RANGE. PLEASE REFER TO THE
APPLICATIONS INFORMATION SECTION FOR START-UP DETAILS.
V
OUT
OUT
5V AT 500mA
BIAS
ADJ
2.2µF
19.1k
8021 TA01a
For more information
Step-Down DC/DC µModule
DescripTion
The LTM 8021 is a 36V
®
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.
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.
Efficiency and Power Loss
90
80
EFFICIENCY
70
60
50
40
30
1.00
www.linear.com/LTM8021
LTM8021
36V , 500mA
IN
500mA, step-down DC/DC
IN
450
400
350
300
250
200
150
POWER
100
LOSS
50
0
10.00 100.00 1000.00
LOAD CURRENT (mA)
8021 TA01b
8021fd
1