LTM8021IV#PBF Linear Technology, LTM8021IV#PBF Datasheet

IC DC/DC UMODULE 500MA 35-LGA

LTM8021IV#PBF

Manufacturer Part Number
LTM8021IV#PBF
Description
IC DC/DC UMODULE 500MA 35-LGA
Manufacturer
Linear Technology
Series
µModuler
Type
Point of Load (POL) Non-Isolatedr
Datasheet

Specifications of LTM8021IV#PBF

Design Resources
LTM8021 Spice Model
Output
0.8 ~ 5 V
Number Of Outputs
1
Power (watts)
2.5W
Mounting Type
Surface Mount
Voltage - Input
3 ~ 36 V
Package / Case
35-LGA
1st Output
0.8 ~ 5 VDC @ 500mA
Size / Dimension
0.44" L x 0.25" W x 0.11" H (11.25mm x 6.25mm x 2.82mm)
Power (watts) - Rated
2.5W
Operating Temperature
-40°C ~ 125°C
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
3rd Output
-
2nd Output
-

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Quantity
Price
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Part Number:
LTM8021IV#PBF
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LT
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LTM8021IV#PBF
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LINEAR
Quantity:
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FEATURES
APPLICATIONS
n
n
n
n
n
n
n
n
n
n
n
n
n
n
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.
L, LT, LTC, LTM, μModule, Linear Technology and the Linear logo are registered trademarks of
Linear Technology Corporation. All other trademarks are the property of their respective owners.
®
®
. Included in the package are the switching
8021 is a 36V
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
, 500mA
1000.00
8021 TA01b
50
0
450
400
350
300
250
200
150
100
8021fc
1

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LTM8021IV#PBF Summary of contents

Page 1

... The LTM8021 is RoHS compliant. L, LT, LTC, LTM, μModule, Linear Technology and the Linear logo are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. 90 ...

Page 2

... 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. For more information on lead free part marking, go to: This product is only offered in trays. For more information go to: ELECTRICAL CHARACTERISTICS erature range, otherwise specifi ...

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 standalone nonisolated 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 programmable via ...

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

... LTM8021. However, these capacitors can cause problems if the LTM8021 is plugged into a live supply (see the Linear Technology Application Note 88 for a complete discussion). The low loss ceramic capacitor combined with stray inductance in series with the power ...

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 not infringe on existing patent rights. LTM8021 Pinout (Sorted by Pin Number) ...

Page 16

... LTM4608 8A Low V DC/DC μModule IN LTM8020 36V, 200mA DC/DC μModule LTM8022 1A, 36V DC/DC μModule LTM8023 2A, 36V DC/DC μModule PolyPhase is a trademark of Linear Technology Corporation Linear Technology Corporation 16 1630 McCarthy Blvd., Milpitas, CA 95035-7417 (408) 432-1900 FAX: (408) 434-0507 ● 3.3V Step-Down Converter LTM8021 V ...

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