LTM8008HVPBF LINER [Linear Technology], LTM8008HVPBF Datasheet

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LTM8008HVPBF

Manufacturer Part Number
LTM8008HVPBF
Description
72VIN, 6 Output DC/DC SEPIC ?Module Regulator
Manufacturer
LINER [Linear Technology]
Datasheet
FeaTures
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applicaTions
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L, LT, LTC, LTM, Linear Technology, the Linear logo and µModule are registered trademarks of
Linear Technology Corporation. All other trademarks are the property of their respective owners.
Typical applicaTion
One SEPIC Converter with Six Linear Regulators
Wide Input Voltage Range: 3V to 72V, 6V Start
Wide Operating Temperature: –40°C to 150°C
(H-Grade)
Current Mode Control Provides Excellent Transient
Response
Programmable Operating Frequency
(100kHz to 1MHz) with One External Resistor
Synchronizeable to an External Clock
Programmable Input Undervoltage Lockout with
Hysteresis
Programmable Soft-Start
Small 15mm × 15mm × 2.82mm LGA Package
Automotive Converters
Industrial Converters
Telecom Power Supplies
3V TO 72V
4.7µF
V
IN
L1: COUPLED INDUCTOR, COILCRAFT MSD1278T-472ML
42.2k
4.99k
22nF
4.7µH
Six Output DC/DC µModule Regulator
L1A
V
SS
RT
V
SYNC
IN
C
RUN
INTV
LTM8008
SW
CC
4.7µF
GND
10µF
V
V
V
V
V
V
DescripTion
The LTM
six post regulators. The SEPIC controller’s fixed frequency,
current-mode architecture results in stable operation over
a wide range of supply and output voltages and features
soft-start and frequency foldback functions to limit inductor
current during start-up and output short-circuit.
The LTM8008 also includes six high performance, fixed
output LDOs for post-regulation: one 5V at 500mA, one
3.3V at 300mA, and four 5V at 150mA. The output of the
SEPIC controller is internally set to 5.6V for optimal ef-
ficiency. In addition to providing these outputs, the SEPIC
converter can supply up to an additional 500mA to the
system load.
The LTM8008 is packaged in a thermally enhanced, compact
(15mm × 15mm) and low profile (2.82mm) over-molded
land grid array (LGA) package suitable for automated
assembly by standard surface mount equipment. The
LTM8008 is Pb-free and RoHS compliant.
OUT1
OUT2
OUT3
OUT4
OUT5
OUT6
SPV
SEPIC µModule Regulator
SBR3U100LP-7
72V
22µF
®
8008 is a 72V
4.7µH
L1B
10µF
IN
10µF
, 6 Output DC/DC
10µF
8008 TA01
IN
, µModule
10µF
10µF
5V AT 500mA
5V AT 150mA
5V AT 150mA
5V AT 150mA
5V AT 150mA
3.3V AT 300mA
®
SEPIC converter with
LTM8008
8008fa
1

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LTM8008HVPBF Summary of contents

Page 1

FeaTures One SEPIC Converter with Six Linear Regulators n Wide Input Voltage Range 72V, 6V Start n Wide Operating Temperature: –40°C to 150°C n (H-Grade) Current Mode Control Provides Excellent Transient n Response Programmable Operating Frequency n (100kHz ...

Page 2

LTM8008 absoluTe MaxiMuM raTings (Note .....................................................................80V IN RUN .................................................................... INTV SYNC, SPV, INTV .................................................... ......................................................................... ............................................................................1.5V V Relative to SPV ...................................±20 OUT1,2,3,4,5,6 Operating Internal Temperature (Note 2) .................................................. –40°C to ...

Page 3

V = 14V, RUN = 14V, otherwise specifications are PARAMETER Switching Frequency Minimum Off Time Minimum On Time SYNC Input Low SYNC Input High SS Sourcing Current SS Sink Current Under Fault RUN Threshold ...

Page 4

LTM8008 Typical perForMance characTerisTics V vs Load OUT1 5.018 5.016 5.014 5.012 5.010 5.008 5.006 5.004 5.002 5.000 0 100 200 300 400 LOAD CURRENT (mA) 8008 G01 SPV vs Percentage of LDO Load 5.625 5.620 5.615 5.610 5.605 0 ...

Page 5

Typical perForMance characTerisTics V Current Limit OUT2,3,4,5 vs Temperature 600 500 SHORT-CIRCUIT 400 V DROPS 1% OUT 300 200 100 0 –40 – 100 120 140 TEMPERATURE (°C) 8008 G10 RUN Threshold vs Temperature 1.210 ...

Page 6

LTM8008 pin FuncTions V (K4, L4): Input Supply Pin. Must be locally bypassed IN with a 0.22μF or larger capacitor placed close to the pin. RUN (F1, F2): Shutdown and Undervoltage Detect Pin. An accurate 1.21V (nominal) falling threshold with ...

Page 7

DiagraM V IN INTV CC RUN SS SYNC operaTion The LTM8008 is a SEPIC equipped with six high perfor- mance linear post regulators. The device contains the SEPIC power MOSFET, controller, linear regulators and optimized ...

Page 8

LTM8008 applicaTions inForMaTion Running Input Voltage Versus Start Voltage In normal operation the LTM8008 SEPIC Converter output SPV is used to run the INTV internal biasing through CC a rectifying diode (see the Block Diagram). This allows the internal MOSFET ...

Page 9

In an actual application, most of the INTV is used to drive the gate capacitance of the power MOSFET. The power dissipation can be a significant concern when the internal MOSFET is being driven at a high frequency ...

Page 10

LTM8008 applicaTions inForMaTion SS pin, initiating a soft-start operation. The soft-start in- terval is set by the soft-start capacitor selection according to the equation: 1.25V • 10µA Thermal Lockout If LTM8008 internal temperature reaches 165°C ...

Page 11

Connect all of the GND connections to as large a copper pour or plane area as possible on the top layer. Avoid breaking the ground connection between the external components and the LTM8008. 5. For good heatsinking, ...

Page 12

LTM8008 applicaTions inForMaTion X7R. The Z5U and Y5V dielectrics are good for providing high capacitances in a small package, but they tend to have strong voltage and temperature coefficients. When used with a 5V regulator, a 16V 10μF Y5V capacitor ...

Page 13

DescripTion PIN NAME PIN NAME A1 SPV C1 GND GND OUT6 GND OUT6 A4 GND C4 GND GND OUT5 GND OUT4 A7 GND C7 GND A8 V ...

Page 14

LTM8008 package DescripTion bbb // 6.350 5.080 3.810 2.540 1.585 1.270 0.955 0.000 1.270 2.540 3.810 5.080 6.350 8008fa ...

Page 15

REV DATE DESCRIPTION A 2/11 Removed “RUN Threshold to I 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 ...

Page 16

LTM8008 Typical applicaTion 72V 4.7µF 42.2k 4.99k L1: COUPLED INDUCTOR, COILCRAFT MSD1278T-472ML relaTeD parTs PART NUMBER DESCRIPTION LTM8027 60V, 4A DC/DC µModule Regulator LTC3824 60V, 40µA I DC/DC Regulator Q For an H-Grade Product Portfolio go ...

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