LTM4676A datasheet(57/136 Pages) LINER

Teilenummer	LTM4676A

Bauteilbeschribung	Dual 13A or Single 26A 關Module Regulator with Digital Power System Management

Download	136 Pages

Scroll/Zoom	100%

Hersteller	LINER [Linear Technology]

Direct Link	http://www.linear.com

Logo

57 / 136 page

LTM4676A

57

4676afa

For more information www.linear.com/LTM4676A

applicaTions inForMaTion

communications are valid in this supply configura-

tion. If SVIN has not been applied to the LTM4676A,

MFR_COMMON[3] will be asserted low, indicating that

NVM has not initialized. If this condition is detected, the

part will only respond to addresses 0x5A and 0x5B. To

initialize the part issue the following set of commands:

global address 0x5B command 0xBD data 0x2B followed

by global address 0x5B command 0xBD and data 0xC4.

Thepartwillnowrespondtothecorrectaddress.Configure

the part as desired then issue a STORE_USER_ALL. When

SVIN is applied a MFR_RESET or RESTORE_USER_ALL,

command must be issued to allow the PWM to be enabled

and valid ADC conversions to be read.

FAULT DETECTION AND HANDLING

The LTM4676A GPIOn pins are configurable to indicate a

varietyoffaultsincludingOV/UV,OC,OT,timingfaults,peak

overcurrentfaults.InadditiontheGPIOnpinscanbepulled

low by external sources to indicate to the LTM4676A the

presence of a fault in some other portion of the system.

The fault response is configurable via PMBus Command

Code names with a _RESPONSE suffix and allows the

following options:

n

Ignore

n

Shut Down Immediately—Latch Off

n

ShutDownImmediately—RetryIndefinitelyattheTime

Interval Specified in MFR_RETRY_DELAYn

Refer to Appendix C and the PMBus specification for

more details.

The OV response is automatic and rapid. If an OV is de-

tected, MTn is turned off and BGn is turned on, until the

OV condition clears.

Fault logging is available on the LTM4676A. The fault

logging is configurable to automatically store data when

a fault occurs that causes the unit to fault off. The header

portion of the fault logging table contains peak values. It

is possible to read these values at any time. This data will

be useful while troubleshooting the fault.

If the LTM4676A internal temperature is in excess of 85°C

or below 0°C, the write into the NVM is not recommended.

The data will still be held in RAM, unless the 3.3V supply

UVLO threshold is reached. If the die temperature exceeds

130°C all NVM communication is disabled until the die

temperature drops below 125°C, with the exception of

the RESTORE_USER_ALL command, which is valid at

any temperature.

OPEN-DRAIN PINS

Note that up to nine pull-up resistors are required for

proper operation of the LTM4676A:

• Three for the SMBus/I2C interface (the SCL, SDA, and

ALERT pins); two, only if the system SMBus host does

not make use of the ALERT interrupt. (These are 5V

tolerant).

• One each for the RUN0 and RUN1 pins (or, just one to

RUN0 and RUN1, if RUN0 and RUN1 are electrically

connected together). (These are 5V tolerant).

• OneeachforGPIO0andGPIO1(or,justonetoGPIO0and

GPIO1, if GPIO0 and GPIO1 are electrically connected

together). (These are 3.3V tolerant).

• One on SHARE_CLK, required, for the LTM4676A to

establish a heartbeat time base for timing-related op-

erations and functions (output voltage ramp-up timing,

voltage margining transition timing, SYNC open-drain

drive frequency). (SHARE CLK is 3.3V tolerant).

• One on SYNC, in order for the LTM4676A to phase lock

to the frequency generated by the open-drain output

of its digital engine. EXCEPTION: in some applications,

it is desirable to drive the LTM4676A’s SYNC pin with

a hard-driven (low impedance) external clock. This

is the only scenario where the LTM4676A does not

require a pull-up resistor on SYNC. However, be aware

that the SYNC pin can be low impedance during NVM

initialization,i.e.,duringdownloadofEEPROMcontents

to RAM (for ~50ms [Note 12] after SVIN power is ap-

plied). Therefore, the hard-driven clock signal should

only be applied to the LTM4676A SYNC pin through a

LTM4676A Datenblatt(PDF) 57 Page - Linear Technology

LTM4676A Datenblatt(HTML) 57 Page - Linear Technology

Ähnliche Teilenummer - LTM4676A

Ähnliche Beschreibung - LTM4676A

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ...More

Datenblatt Download

Link URL