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PDF LTM4677 Data sheet ( Hoja de datos )
| Número de pieza | LTM4677 | |
| Descripción | Dual 18A or Single 36A uModule Regulator | |
| Fabricantes | Linear Technology | |
| Logotipo |  |
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LTM4677
Features
Dual 18A or Single 36A
µModule Regulator with Digital
Power System Management
Description
n Dual, Fast, Analog Loops with Digital Interface
for
Control and Monitoring
n Wide Input Voltage Range: 4.5V to 16V
n Output Voltage Range: 0.5V to 1.8V
n ±0.5% Maximum DC Output Error Over Temperature
n ±2.5% Current Readback Accuracy
n Pin Compatible with LTM4676A (Dual 13A, Single 26A)
n 400kHz PMBus-Compliant I2C Serial Interface
n Supports Telemetry Polling Rates up to 125Hz
n Integrated 16-Bit ∆Σ ADC
n Constant Frequency Current Mode Control
n Parallel and Current Share Multiple Modules
n 16mm × 16mm × 5.01mm BGA Package
Readable Data:
n Input and Output Voltages, Currents, and Temperatures
n Running Peak Values, Uptime, Faults and Warnings
n Onboard EEPROM Fault Log Record
Writable Data and Configurable Parameters:
n Output Voltage, Voltage Sequencing and Margining
n Digital Soft-Start/Stop Ramp
n OV/UV/OT, UVLO, Frequency and Phasing
Applications
n System Optimization, Characterization and Data Min-
ing in Prototype, Production and Field Environments
n Telecom, Datacom, and Storage Systems
The LTM®4677 is a dual 18A or single 36A step-down
µModule® (power module) DC/DC regulator featuring
remote configurability and telemetry-monitoring of power
management parameters over PMBus— an open standard
I2C-based digital interface protocol. The LTM4677 is
comprised of fast analog control loops, precision mixed-
signal circuitry, EEPROM, power MOSFETs, inductors and
supporting components.
The LTM4677’s 2-wire serial interface allows outputs to be
margined, tuned and ramped up and down at programmable
slew rates with sequencing delay times. Input and output
currents and voltages, output power, temperatures, uptime
and peak values are readable. Custom configuration of
the EEPROM contents is not required. At start-up, output
voltages, switching frequency, and channel phase angle
assignments can be set by pin-strapping resistors. The
LTpowerPlay™ GUI and DC1613 USB-to-PMBus converter
and demo kits are available.
The LTM4677 is pin compatible with the LTM4676A (dual
13A) and is offered in a 16mm × 16mm × 5.01mm BGA pack-
age available with SnPb or RoHS compliant terminal finish.
L, LT, LTC, LTM, Linear Technology, the Linear logo, µModule, Burst Mode and PolyPhase
are registered trademarks and LTpowerPlay is a trademark of Linear Technology Corporation.
All other trademarks are the property of their respective owners. Protected by U.S. Patents
including 5408150, 5481178, 5705919, 5929620, 6144194, 6177787, 6580258, 7420359,
8163643. Licensed under U.S. Patent 7000125 and other related patents worldwide.
Typical Application
Dual 18A µModule Regulator with Digital
Interface for Control and Monitoring*
VIN
5.75V TO 16V 22µF
×4
ON/OFF CONTROL
FAULT INTERRUPTS,
POWER SEQUENCING
VIN0
VIN1
SVIN
VOUT0
VOSNS0+
RUN0
RUN1
GPIO0
GPIO1
VOSNS0–
LTM4677 VOUT1
VOSNS1
PWM CLOCK AND
TIME-BASE
SYNCHRONIZATION
REGISTER WRITE
PROTECTION
SYNC
SHARE_CLK
WP GND
*FOR COMPLETE CIRCUIT, SEE FIGURE 55
SGND
SCL
SDA
ALERT
4677 TA01a
LOAD0
VOUT0,
ADJUSTABLE
UP TO 18A
100µF
×6
LOAD1
VOUT1,
ADJUSTABLE
UP TO 18A
100µF
×6
I2C/SMBus I/F WITH
PMBus COMMAND SET
TO/FROM IPMI OR OTHER
BOARD MANAGEMENT
CONTROLLER
Using PMBus and LTpowerPlay to Monitor Telemetry and Margin
VOUT0/VOUT1 During Load Pattern Tests. 10Hz Polling Rate. 12VIN
Output Voltage Readback, VOUT Margined 7.5% Low
1.1 1.9
1.0 1.8
0.9 1.7
0.8
0
1.6
3 6 9 12
TIME (SEC)
4677 TA01b
Input Current Readback
1.5 2.4
1.0 1.6
0.5 0.8
00
0 3 6 9 12
TIME (SEC)
4677 TA01d
Output Current Readback, Varying Load Pattern
15 15
10 10
55
00
0 3 6 9 12
TIME (SEC)
4677 TA01c
Power Stage Temperature Readback
60 60
57 57
54 54
51 51
0 3 6 9 12
TIME (SEC)
4677 TA01e
4677f
For more information www.linear.com/LTM4677
1
1 page  
LTM4677
E lectrical Characteristics The l denotes the specifications which apply over the specified internal
FoseRpteEtirQnaUgtisEnNganCtedYm_pSpeWer rTIaeTtsCutrHeC=irrac5nu0gi0tek1H(,Nzuoantnleed2sVs).OoSUthpTneerccwiofiimseedmnaaosntdeeeaddc.htoin1d.i0v0id0uVaulnoluetspsuot tchhearnwniesel (nNootteed4. )C.oTnAfi=gu2r5e°dCw, VitIhN
f=ac1t2oVry,-RdeUfNanul=t
5V,
EEPROM
SYMBOL
PARAMETER
CONDITIONS
MIN
VIN
Input DC Voltage
Test Circuit 1
Test Circuit 2; VIN_OFF < VIN_ON = 4.25V
l 5.75
l 4.5
VOUTn
Range of Output Voltage
Regulation
VOUTn(DC)
Output Voltage, Total
Variation with Line and
Load
Input Specifications
VOUT0 Differentially Sensed on VOSNS0+/VOSNS0– Pin-Pair;
VOUT1 Differentially Sensed on VOSNS1/SGND Pin-Pair;
Commanded by Serial Bus or with Resistors Present at Start-Up on
VOUTnCFG and/or VTRIMnCFG
Digital Servo Engaged (MFR_PWM_MODEn[6] = 1b)
DV(MOigUFiTtRan_lCPSoWemrMvmo_aDMnisOdeeDndEgntao[g11e].d0=0(1M0bVF),R(VN_OPoUtWeTnM5L)_oMwORDaEnng[6e] = 0b)
l 0.5
l 0.5
l 0.995
0.985
IINRUSH(VIN)
IQ(SVIN)
IS(VINn,PSM)
Input Inrush Current at
Start-Up
Test Circuit
TON_RISEn
1=,3VmOUsTn
=1V,
VIN
=
12V;
No
Load
Besides
Capacitors;
Input Supply Bias Current FoRSrchUeuNdtndCo=own5ntVi,n,RuRUoUuNNs01M=-noR=dU0eN,V1M=FR0V_PWM_MODEn[0] = 1b
Input Supply Current in
Pulse-Skipping Mode
Operation
Pulse-Skipping
IOUTn = 100mA
Mode,
MFR_PWM_MODEn[0]
=
0b,
IS(VINn,FCM)
IS(VINn,SHUTDOWN)
Input Supply Current in
Forced-Continuous Mode
Operation
Input Supply Current in
Shutdown
Forced Continuous Mode, MFR_PWM_MODEn[0] = 1b
IIOOUUTTnn
=
=
100mA
18A
Shutdown, RUNn = 0V
Output Specifications
IOUTn
Output Continuous
Current Range
(Note 6)
0
∆VOUTn(LINE)
VOUTn
Line Regulation Accuracy
IDDS(OMViiUggFITiiNttRnaaa_=llnPSS0dWeeArrVM,vvIooN5_n.ED7MEn5isOlgVeeDacn≤gtEgrenViacd[gI1aN(el]lMd≤y=F(S11MR6hb_VoF)P,Rr,tFWV_eRdOPMEUWTQ_ToMMULgEoe_OtNwMDhCeOERYrnDa_[anE6Sngn]dW[e=6IIN]T1T=Cb)VH0Cb=C)
Open Circuit;
350kHz
(Note 5)
l
∆VOUTn(LOAD)
VOUTn
Load Regulation
Accuracy
Digital Servo Engaged (MFR_PWM_MODEn[6] = 1b)
Digital Servo
0(NAo≤teIO5U)Tn ≤
1D8isAe,nVgOaUgTedLo(wMFRRa_nPgWe, M(M_FMRO_DPEWnM[6_] M= O0Db)En[1]
=
1b)
l
VOUTn(AC)
fS (Each Channel)
∆VOUTn(START)
tSTART
Output Voltage Ripple
VOUTn Ripple Frequency
Turn-On Overshoot
Turn-On Start-Up Time
FREQUENCY_SWITCH Set to 500kHz (0xFBE8)
TON_RISEn = 3ms (Note 12)
Time from VIN Toggling from 0V to 12V to Rising Edge of GPIOn.
TMOFNR__DGEPLIOAY_Pn R=O0PmAsG,ATTOENn_=R0ISxE0n10=03, ms,
MFR_GPIO_RESPONSEn = 0x0000
l 462.5
l
TYP
1.000
1.000
400
40
20
20
35
1.9
50
0.03
0.03
0.03
0.2
10
500
8
60
MAX
16
5.75
1.8
1.8
1.005
1.015
18
±0.2
0.5
537.5
70
UNITS
V
V
V
V
V
V
mA
mA
mA
mA
mA
A
µA
A
%/V
%/V
%
%
mVP-P
kHz
mV
ms
For more information www.linear.com/LTM4677
4677f
5
5 Page 
Electrical Characteristics
Note 3: The LTM4677’s EEPROM temperature range for valid write
commands is 0°C to 85°C. To achieve guaranteed EEPROM data retention,
execution of the “STORE_USER_ALL” command—i.e., uploading RAM
contents to NVM—outside this temperature range is not recommended.
However, as long as the LTM4677’s EEPROM temperature is less than
130°C, the LTM4677 will obey the STORE_USER_ALL command. Only
when EEPROM temperature exceeds 130°C, the LTM4677 will not act
on any STORE_USER_ALL transactions: instead, the LTM4677 NACKs
the serial command and asserts its relevant CML (communications,
memory, logic) fault bits. EEPROM temperature can be queried prior
to commanding STORE_USER_ALL; see the Applications Information
section.
Note 4: The two power inputs—VIN0 and VIN1—and their respective power
outputs—VOUT0 and VOUT1—are tested independently in production. A
shorthand notation is used in this document that allows these parameters
to be refered to by “VINn” and “VOUTn”, where n is permitted to take on a
value of 0 or 1. This italicized, subscripted “n ” notation and convention
is extended to encompass all such pin names, as well as register names
with channel-specific, i.e., paged data. For example, VOUT_COMMANDn
refers to the VOUT_COMMAND command code data located in Pages 0
and 1, which in turn relate to Channel 0 (VOUT0) and Channel 1 (VOUT1).
Registers containing non-page-specific data, i.e., whose data is “global” to
the module or applies to both of the module's Channels lack the italicized,
subscripted “n ”, e.g., FREQUENCY_SWITCH.
Note 5: VOUTn (DC) and line and load regulation tests are performed in
production with digital servo disengaged (MFR_PWM_MODEn[6] = 0b)
and low VOUTn range selected MFR_PWM_MODEn[1] = 1b. The digital
servo control loop is exercised in production (setting MFR_PWM_
MODEn[6] = 1b), but convergence of the output voltage to its final settling
value is not necessarily observed in final test—due to potentially long
time constants involved—and is instead guaranteed by the output voltage
readback accuracy specification. Evaluation in application demonstrates
capability; see the Typical Performance Characteristics section.
Note 6: See output current derating curves for different VIN, VOUT, and TA,
located in the Applications Information section.
Note 7: Even though VOUT0 and VOUT1 are specified for 6V absolute
maximum, the maximum recommended command voltage to regulate
output channels 0 and 1 is: 1.8V with VOUT range-setting bit is set to “low
range”, MFR_PWM_MODEn[1] = 1b.
LTM4677
Note 8: Minimum on-time is tested at wafer sort.
Note 9: Data conversion is performed in round-robin (cyclic) fashion. All
telemetry signals are continuously digitized, and reported data is based on
measurements not older than 100ms, typical.
Note 10: The following telemetry parameters are formatted in PMBus-
defined “Linear Data Format”, in which each register contains a word
comprised of 5 most significant bits—representing a signed exponent, to
be raised to the power of 2—and 11 least significant bits—representing
a signed mantissa: input voltage (on SVIN), accessed via the READ_VIN
command code; output currents (IOUTn), accessed via the READ_IOUTn
command codes; module input current (IVIN0 + IVIN1 + ISVIN), accessed via
the READ_IIN command code; channel input currents (IVINn + 1/2 • ISVIN),
accessed via the MFR_READ_IINn command codes;and duty cycles of
channel 0 and channel 1 switching power stages, accessed via the
READ_DUTY_CYCLEn command codes. This data format limits the
resolution of telemetry readback data to 10 bits even though the internal
ADC is 16 bits and the LTM4677’s internal calculations use 32-bit words.
Note 11: The absolute maximum rating for the SVIN pin is 18V. Input
voltage telemetry (READ_VIN) is obtained by digitizing a voltage scaled
down from the SVIN pin.
Note 12: These typical parameters are based on bench measurements and
are not production tested.
Note 13: EEPROM endurance and retention are guaranteed by wafer-level
testing for data retention. The minimum retention specification applies
for devices whose EEPROM has been cycled less than the minimum
endurance specification, and whose EEPROM data was written to at 0°C
≤ TJ ≤ 85°C. The RESTORE_USER_ALL or MFR_RESET is valid over
the entire operating temperature range and does not influence EEPROM
characteristics.
Note 14: Channel 0 OV/UV comparator threshold accuracy for
MFR_PWM_MODEn[1] = 1b tested in ATE at VVOSNS0+ – VVOSNS0– =
0.5V and 1.8V. 1V condition tested at IC-Level, only. Channel 1 OV/UV
comparator threshold accuracy for MFR_PWM_MODEn[1] = 1b tested
in ATE with VVOSNS1-VSGND = 0.5V and 1.8V. 1.5V condition tested at
IC-level, only.
Note 15: Tested at IC-level ATE.
For more information www.linear.com/LTM4677
4677f
11
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet LTM4677.PDF ] | |
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