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LTM4676A Arkusz danych(PDF) 23 Page - Linear Technology

Numer części LTM4676A
Szczegółowy opis  Dual 13A or Single 26A 關Module Regulator with Digital Power System Management
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Producent  LINER [Linear Technology]
Strona internetowa  http://www.linear.com
Logo LINER - Linear Technology

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LTM4676A
23
4676afa
For more information www.linear.com/LTM4676A
operaTion
Table 1 provides a summary of LTM4676A’s supported
PMBuscommands,aswellasadirectcomparisontothose
of the LTM4676. For details on the supported commands,
payloads and data formats see Appendix C: PMBus Com-
mand Details.
For introductory information about the PMBus Specifica-
tion, see Appendix A: Similarity Between PMBus, SMBus
and I2C 2-Wire Interface. For information about the data
communication link layer and timing diagrams, see Ap-
pendix B: PMBus Serial Digital Interface.
Major features of the LTM4676A strictly from a DC/DC
converter power delivery point of view are as follows:
n
Up to 13A Output Current Delivery from Each of Two
Integrated Power Stages (See Front Page Figure)—or
Up to 26A Output, Combined (See Figure  35 and
Figure 42).
n
Wide Input Voltage Range: DC/DC Step-Down Con-
version from 5.75V to 26.5V Input (See Figure 69).
n
DC/DCStep-DownConversionfrom4.5Vto5.75VInput,
Connecting SVIN to INTVCC (See Figure 35).
n
DC/DCStep-DownConversionPossiblefromLessThan
4.5V Input When an Auxiliary 5V Bias Supply Powers
SVIN and INTVCC (See Figure 37).
n
Output Voltage Range: 0.5V to 5.5V on both VOUT0 and
VOUT1.
n
Differential Remote Sensing of VOUT0 (VOSNS0+/
VOSNS0–). For paralleled outputs, the VOSNS0+/VOSNS0–
pin-pair can be configured as the feedback path for
both VOUT0 and VOUT1 (see Figure 42 and, optionally,
MFR_PWM_CONFIG[7]).
n
Start-Up Into a Pre-Biased Load Without Sinking
Current.
n
Four LTM4676As Can Be Paralleled to Deliver Up to
100A (See Figure 39).
n
OneLTM4676ACanBeParalleledwithThreeLTM4620A
or LTM4630 Modules to Deliver Up to 130A; Infer
Rail Status and Telemetry of Paralleled LTM4620A or
LTM4630 via the Sole LTM4676A (See Figure 40).
n
Discontinuous Mode Operation Available for Higher
Light-Load Efficiency (MFR_PWM_MODEn[0]).
n
Output Current Limit and Overvoltage Protection.
n
Three Integrated Temperature Sensors, Over/Under-
temperature Protection.
n
Constant Frequency Peak Current Mode Control.
n
Configurable Switching Frequency, 250kHz to 1MHz;
Synchronizable to External Clock; Seven Configurable
Channel Phase Interleaving Settings.
n
Internal Loop Compensation Provided; External Loop
Compensation Can Be Applied, if Preferred.
n
Integrated Snubber Capacitors Enable EMI Reduction
by Placing External Snubber Resistors Adjacent to the
Module (see Figures 32 and 33).
n
Low Profile (16mm × 16mm × 5.01mm) BGA Package
PowerSolutionRequiresOnlyInputandOutputCapaci-
tors; at Most, Nine Pull-Up Resistors for Open-Drain
Digital Signals; at Most, Six Pull-Down Resistors to
Configure All Possible Pin-Strapping Options.
Features of the LTM4676A that enable power system
management, rail sequencing, and fault monitoring and
reporting are as follows:
n
I2C-basedPMBus/SMBus2-WireSerialCommunication
Interface (SDA, SCL) with ALERT Interrupt Pin, SCL
Clock Capable of 400kHz Bus Communication Speeds
with Clock Low Extending—or 100kHz, Otherwise.
n
Configurable Output Voltage.
n
Configurable Input Undervoltage Comparators
(UVLO Rising, UVLO Falling).
n
Configurable Switching Frequency.
n
Configurable Current Limit.
n
Configurable Output Over/Undervoltage Comparators.
n
Configurable Turn-On and Turn-Off Delay Times.
n
Configurable Output Ramp Rise and Fall Times.
n
Non-Volatile Configuration Memory (NVM EEPROM)
with ECC to Configure Aforementioned Settings, and
More—Yielding Standalone Operation, if Desired, and


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