LTM8021 Datasheet, PDF (1/16 Pages) Linear Technology – 36VIN, 500mA Step-Down DC/DC μModule

LTM8021
36V_IN, 500mA
Step-Down DC/DC µModule
FEATURES
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
APPLICATIONS
n _{Automotive Battery Regulation}
n _{Power for Portable Products}
n _{Distributed Supply Regulation}
n _{Industrial Supplies}
n _{Wall Transformer Regulation}
DESCRIPTION
The LTM^®8021 is a 36V_IN 500mA, step-down DC/DC
μModule^TM. 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.
, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
μModule is a trademark of Linear Technology Corporation. All other trademarks are the
property of their respective owners.
TYPICAL APPLICATION
7V_IN to 36V_IN, 5V/500mA μModule Regulator
V_IN*
7V TO
36V
LTM8021
IN
OUT
RUN/SS
GND
BIAS
ADJ
1μF
19.1k
V_OUT
5V AT 500mA
2.2μF
8021 TA01a
*RUNNING VOLTAGE RANGE. PLEASE REFER TO THE
APPLICATIONS INFORMATION SECTION FOR START-UP DETAILS.
Efficiency and Power Loss
90
450
400
80
350
EFFICIENCY
70
300
250
60
200
50
150
POWER
40
LOSS
100
50
30
1.00
10.00
100.00
LOAD CURRENT (mA)
0
1000.00
8021 TA01b
8021fb
1