LTM8031EVPBF LINER [Linear Technology], LTM8031EVPBF Datasheet

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LTM8031EVPBF

Manufacturer Part Number
LTM8031EVPBF
Description
Ultralow Noise EMC 36V, 1A DC/DC ?Module Regulator
Manufacturer
LINER [Linear Technology]
Datasheet
APPLICATIONS
TYPICAL APPLICATION
FEATURES
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7VDC TO 36VDC
Complete Step-Down Switch Mode Power Supply
Wide Input Voltage Range: 3.6V to 36V
1A Output Current
0.8V to 10V Output Voltage
Switching Frequency from 200kHz to 2.4MHz
EN55022 Class B Compliant
Current Mode Control
(e4) RoHS Compliant Package with Gold Pad Finish
Programmable Soft-Start
Low Profi le (9mm × 15mm × 2.82mm)
Surface Mount LGA Package
Automotive Battery Regulation
Power for Portable Products
Distributed Supply Regulation
Industrial Supplies
Wall Transformer Regulation
Ultralow Noise 5V/1A DC/DC μModule Regulator
V
IN
*
*RUNNING VOLTAGE RANGE.
SEE APPLICATIONS FOR START-UP DETAILS
1μF
44.2k
V
FIN
RUN/SS
SHARE
RT
IN
SYNC GND
LTM8031
PGOOD
BIAS
ADJ
OUT
AUX
8031 TA01a
47.5k
10μF
V
5V
1A
OUT
DC/DC µModule Regulator
Ultralow Noise EMC 36V, 1A
DESCRIPTION
The LTM
36V, 1A DC/DC μModule
meet the radiated emissions requirements of EN55022.
Conducted emission requirements can be met by adding
standard fi lter components. Included in the package are the
switching controller, power switches, inductor, fi lters and
all support components. Operating over an input voltage
range of 3.6V to 36V, the LTM8031 supports an output
voltage range of 0.8V to 10V, and a switching frequency
range of 200kHz to 2.4MHz, each set by a single resistor.
Only the bulk input and output fi lter capacitors 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 density point of load regulation.
The LTM8031 is packaged in a thermally enhanced, compact
(9mm × 15mm) and low profi le (2.82mm) overmolded land
grid array (LGA) package suitable for automated assembly
by standard surface mount equipment. The LTM8031 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.
®
8031 is an electromagnetic compatible (EMC)
–10
80
70
60
50
40
30
20
10
0
0
V
IN
LTM8031 EMI Performance
100
= 36V
200
300
FREQUENCY (MHz)
400
®
500
buck converter designed to
600 700
800
8031 TA01b
LTM8031
900
1000
EN55022
CLASS B
LIMIT
8031fa
1

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LTM8031EVPBF Summary of contents

Page 1

FEATURES n Complete Step-Down Switch Mode Power Supply n Wide Input Voltage Range: 3.6V to 36V n 1A Output Current n 0.8V to 10V Output Voltage n Switching Frequency from 200kHz to 2.4MHz n EN55022 Class B Compliant n Current ...

Page 2

LTM8031 ABSOLUTE MAXIMUM RATINGS (Note FIN, RUN/SS Voltage ..........................................40V IN ADJ, RT, SHARE Voltage ............................................. AUX .................................................................10V OUT Current from AUX ................................................100mA PGOOD, SYNC ..........................................................30V BIAS ..........................................................................25V V + BIAS .................................................................56V IN Maximum Junction Temperature ...

Page 3

ELECTRICAL CHARACTERISTICS temperature range, otherwise specifi cations are at T SYMBOL PARAMETER V Input DC Voltage IN V Output DC Voltage OUT I Continuous Output DC Current OUT I V Quiescent Current Q(VIN BIAS Quiescent Current Q(BIAS) ΔV ...

Page 4

LTM8031 TYPICAL PERFORMANCE CHARACTERISTICS 3.3V Effi ciency OUT 100 12V IN 50 24V IN 36V 200 400 600 800 OUTPUT CURRENT (mA) 8031 G01 Input Current vs Output Current, 3.3V OUT ...

Page 5

TYPICAL PERFORMANCE CHARACTERISTICS Minimum V vs Output Current OUT 12 11 RUN/ RUNNING OR RUN/SS TOGGLED 200 400 800 600 OUTPUT CURRENT (mA) 8031 G10 Output ...

Page 6

LTM8031 TYPICAL PERFORMANCE CHARACTERISTICS Radiated Emissions 36V 10V AT 1A OUT –10 0 100 200 300 400 500 FREQUENCY (MHz) PIN FUNCTIONS V (Bank 3): ...

Page 7

PIN FUNCTIONS SYNC (Pin L6): This is the external clock synchronization input. Ground this pin for low ripple Burst Mode at low output loads. Tie to a stable voltage source greater than 0.7V to disable Burst Mode operation. Do not ...

Page 8

LTM8031 OPERATION The LTM8031 is a standalone nonisolated step-down switching DC/DC power supply. It can deliver output current with only bulk external input and output capacitors. This module provides a precisely regulated output voltage programmable ...

Page 9

APPLICATIONS INFORMATION Table 1. Recommended Component Values and Confi guration (See Typical Performance Characteristics for Load Conditions OUT IN 3.6V to 36V 0.82V 1μF 0805 50V 3.6V to 36V 1.20V 1μF 0805 50V 3.6V to 36V ...

Page 10

LTM8031 APPLICATIONS INFORMATION may have only a small fraction of their nominal capaci- tance resulting in much higher output voltage ripple than expected. Ceramic capacitors are also piezoelectric. In Burst Mode operation, the LTM8031’s switching frequency depends on the load ...

Page 11

APPLICATIONS INFORMATION than 56V. If BIAS power is applied from a remote or noisy voltage source, it may be necessary to apply a decoupling capacitor locally to the LTM8031. Load Sharing Two or more LTM8031s may be paralleled to produce ...

Page 12

LTM8031 APPLICATIONS INFORMATION Shorted Input Protection Care needs to be taken in systems where the output will be held high when the input to the LTM8031 is absent. This may occur in battery charging applications or in battery back-up systems ...

Page 13

APPLICATIONS INFORMATION GND C OUT AUX OPTIONAL CAPACITOR V OUT GND Figure 3. Layout Showing Suggested External Components, GND Plane and Thermal Vias Hot-Plugging Safely The small size, robustness and low impedance of ceramic capacitors make them an attractive option ...

Page 14

LTM8031 APPLICATIONS INFORMATION CLOSING SWITCH SIMULATES HOT PLUG + LOW IMPEDANCE ENERGIZED 24V SUPPLY + 0.1μF + 22μF 35V AI.EI. Figure 4. A Well Chosen Input Network Prevents Input Voltage Overshoot and Ensures Reliable Operation When the LTM8031 is Hot-Plugged ...

Page 15

TYPICAL APPLICATIONS 3.6V TO 15V 9V TO 24V 0.82V Step-Down Converter OUT IN 1μF FIN LTM8031 AUX RUN/SS BIAS SHARE PGOOD RT SYNC GND ADJ 69.8k 5.11M 8031 TA02 *RUNNING VOLTAGE RANGE. SEE APPLICATIONS FOR START-UP ...

Page 16

LTM8031 TYPICAL APPLICATIONS 3.6V TO 36V 4.75V TO 36V 6.8V TO 36V 16 2.5V Step-Down Converter OUT IN 1μF FIN LTM8031 AUX RUN/SS 3.3V BIAS SHARE PGOOD RT SYNC GND ADJ 61.9k 115k 8031 TA04 *RUNNING ...

Page 17

TYPICAL APPLICATIONS 10.5V TO 36V Two LTM8031s Operating in Parallel (Also See the LTM8032, 2A Pin Compatible) 11.5V TO 36V OPTIONAL SYNC TIE TO GND IF NOT USED 8V Step-Down Converter OUT IN FIN LTM8031 AUX ...

Page 18

LTM8031 PACKAGE DESCRIPTION aaa Z PAD 1 CORNER 4 15.00 BSC X 9.00 Y BSC PACKAGE TOP VIEW 6.350 5.080 3.810 2.540 1.270 0.000 1.270 2.540 3.810 5.080 6.350 SUGGESTED PCB LAYOUT TOP VIEW 18 LGA Package 71-Lead (15mm × ...

Page 19

PACKAGE DESCRIPTION Table 3. LTM8031 Pinout (Sorted by Pin Number) PIN SIGNAL DESCRIPTION ...

Page 20

LTM8031 PACKAGE PHOTOGRAPH RELATED PARTS PART NUMBER DESCRIPTION LTM4606 Ultralow Noise 6A DC/DC μModule Regulator LTM4612 Ultralow Noise High V OUT LTM8023 36V, 2A DC/DC μModule Regulator LTM8025 36V, 3A DC/DC μModule Regulator LTM8032 36V, 2A EMC DC/DC μModule Regulator ...

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