LTM8021EV-PBF LINER [Linear Technology], LTM8021EV-PBF Datasheet

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LTM8021EV-PBF

Manufacturer Part Number
LTM8021EV-PBF
Description
36VIN, 500mA Step-Down DC/DC ?Module
Manufacturer
LINER [Linear Technology]
Datasheet
FEATURES
APPLICATIONS
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TYPICAL APPLICATION
Complete Switch Mode Power Supply
Wide Input Voltage Range: 3V to 36V
500mA Output Current
0.8V to 5V Output Voltage
Fixed 1.1MHz Switching Frequency
Current Mode Control
(e4) RoHS Compliant Package with Gold
Pad Finish
Programmable Soft-Start
Tiny, Low Profi le (11.25mm × 6.25mm × 2.82mm)
Surface Mount LGA Package
Automotive Battery Regulation
Power for Portable Products
Distributed Supply Regulation
Industrial Supplies
Wall Transformer Regulation
7V
*RUNNING VOLTAGE RANGE. PLEASE REFER TO THE
APPLICATIONS INFORMATION SECTION FOR START-UP DETAILS.
7V TO
V
IN
36V
IN
*
to 36V
1μF
IN
IN
RUN/SS
, 5V/500mA μModule Regulator
GND
LTM8021
ADJ
OUT
BIAS
19.1k
8021 TA01a
2.2μF
V
5V AT 500mA
OUT
Step-Down DC/DC µModule
DESCRIPTION
The LTM
μModule
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 fi nish the design.
The low profi le 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 profi le (2.82mm)
overmolded Land Grid Array (LGA) package suitable
for automated assembly by standard surface mount
equipment. The LTM8021 is RoHS compliant.
μModule is a trademark of Linear Technology Corporation. All other trademarks are the
property of their respective owners.
, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
TM
®
8021 is a 36V
. Included in the package are the switching
90
80
70
60
50
40
30
1.00
Effi ciency and Power Loss
EFFICIENCY
LOAD CURRENT (mA)
10.00
IN
36V
500mA, step-down DC/DC
100.00
POWER
LOSS
IN
LTM8021
1000.00
, 500mA
8021 TA01b
50
0
450
400
350
300
250
200
150
100
8021fb
1

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LTM8021EV-PBF Summary of contents

Page 1

FEATURES n Complete Switch Mode Power Supply n Wide Input Voltage Range 36V n 500mA Output Current n 0. Output Voltage n Fixed 1.1MHz Switching Frequency n Current Mode Control n (e4) RoHS Compliant Package with ...

Page 2

... Maximum Solder Temperature .............................. 260°C Storage Temperature Range ...................–55°C to 125°C ORDER INFORMATION LEAD FREE FINISH PART MARKING* LTM8021EV#PBF LTM8021V LTM8021IV#PBF LTM8021V Consult LTC Marketing for parts specifi ed with wider operating temperature ranges. *The temperature grade is identifi label on the shipping container. ...

Page 3

ELECTRICAL CHARACTERISTICS erature range, otherwise specifi cations are at T SYMBOL PARAMETER V DC Output Voltage OUT(DC) V Output Voltage Ripple (RMS) OUT(AC_RMS) f Switching Frequency SW I Short-Circuit Output Current OSC I Short-Circuit Input Current ISC ADJ Voltage at ...

Page 4

LTM8021 TYPICAL PERFORMANCE CHARACTERISTICS Effi ciency vs Load Current 1.8V OUT 12V 24V 36V ...

Page 5

TYPICAL PERFORMANCE CHARACTERISTICS Input Current vs Output Current 400 3.3V OUT 350 300 250 V = 2.5V OUT 200 150 V = 1.8V OUT 100 50 0 200 450 0 50 100 150 250 ...

Page 6

LTM8021 PIN FUNCTIONS V (Bank 1): The V pin supplies current to the LTM8021’ internal regulator and to the internal power switch. This pin must be locally bypassed with an external, low ESR capacitor of at least 1μF. ...

Page 7

OPERATION The LTM8021 is a stand alone non-isolated step down switching DC/DC power supply. It can deliver up to 500mA of DC output current with only bulk external input and output capacitors. This module provides a precisely regulated output voltage ...

Page 8

LTM8021 APPLICATIONS INFORMATION Table 1. Recommended Component Values and Confi guration V RANGE V IN OUT 3.4V to 36V 0.8V 3.4V to 36V 1.2V 3.4V to 36V 1.5V 3.4V to 36V 1.8V 3.5V to 36V 36V 2.2V ...

Page 9

APPLICATIONS INFORMATION Capacitor Selection Considerations The C and C capacitor values in Table 1 are the IN OUT minimum recommended values for the associated oper- ating conditions. Applying capacitor values below those indicated in Table 1 is not recommended, and ...

Page 10

LTM8021 APPLICATIONS INFORMATION Soft-Start The RUN/SS pin can be used to soft-start the LTM8021, reducing the maximum input current during start-up. The RUN/SS pin is driven through an external RC fi lter to create a voltage ramp at this pin. ...

Page 11

APPLICATIONS INFORMATION PCB Layout Most of the problems associated with the PCB layout have been alleviated or eliminated by the high level of integration of the LTM8021. The LTM8021 is nevertheless a switching power supply, and care must be taken ...

Page 12

LTM8021 APPLICATIONS INFORMATION CLOSING SWITCH SIMULATES HOT PLUG + LOW IMPEDANCE ENERGIZED 24V SUPPLY + + Figure 5. Ensures Reliable Operation When the LTM8021 is Connected to a Live Supply High Temperature Considerations The die temperature of the LTM8021 must ...

Page 13

TYPICAL APPLICATIONS 0.8V Step-Down Converter LTM8021 OUT 3.4V TO 36V 5V BIAS RUN/SS GND ADJ 1μF *RUNNING VOLTAGE RANGE. PLEASE REFER TO THE APPLICATIONS INFORMATION SECTION FOR START-UP DETAILS. *RUNNING VOLTAGE RANGE. PLEASE REFER ...

Page 14

LTM8021 PACKAGE DESCRIPTION 11.250 aaa Z BSC PAD 1 CORNER PACKAGE TOP VIEW 4 2.540 1.270 0.0000 0.9525 1.270 1.5875 2.540 SUGGESTED PCB LAYOUT TOP VIEW NOTES: 1. DIMENSIONING AND TOLERANCING PER ASME Y14.5M-1994 2. ALL DIMENSIONS ARE IN MILLIMETERS ...

Page 15

PACKAGE DESCRIPTION Information furnished by Linear Technology Corporation is believed to be accurate and reliable. However, no responsibility is assumed for its use. Linear Technology Corporation makes no representa- tion that the interconnection of its circuits as described herein will ...

Page 16

LTM8021 TYPICAL APPLICATION 5.5V TO 36V *RUNNING VOLTAGE RANGE. PLEASE REFER TO THE APPLICATIONS INFORMATION SECTION FOR START-UP DETAILS. RELATED PARTS PART NUMBER DESCRIPTION LTM4600 10A DC/DC μModule LTM4600HVMPV Military Plastic 10A DC/DC μModule LTM4601/ 12A DC/DC μModule with PLL, ...

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