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PDF LTM4676A Data sheet ( Hoja de datos )
| Número de pieza | LTM4676A | |
| Descripción | Dual 13A or Single 26A uModule Regulator | |
| Fabricantes | Linear Technology | |
| Logotipo |  |
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LTM4676A
Dual 13A or Single 26A
µModule Regulator with Digital
Power System Management
Features
nn Dual, Fast, Analog Loops with Digital Interface
for
Control and Monitoring
nn Wide Input Voltage Range: 4.5V to 17V
nn Output Voltage Range: 0.5V to 5.5V
nn ±0.5% Maximum DC Output Error Over Temperature
nn ±2.5% Current Readback Accuracy at 10A Load
nn 400kHz PMBus-Compliant I2C Serial Interface
nn Integrated 16-Bit ∆Σ ADC
nn Supports Telemetry Polling Rates Up to 125Hz
nn Constant Frequency Current Mode Control
nn Parallel and Current Share Multiple Modules
nn All 7-Bit Slave Addresses Supported
nn Rail and Global Addressing Supported
nn 16mm × 16mm × 5.01mm BGA Package
Readable Data:
nn Input and Output Voltages, Currents, and Temperatures
nn Running Peak Values, Uptime, Faults and Warnings
nn Onboard EEPROM Fault Log Record
Writable Data and Configurable Parameters:
nn Output Voltage, Voltage Sequencing and Margining
nn Digital Soft-Start/Stop Ramp
nn OV/UV/OT, UVLO, Frequency and Phasing
Applications
nn System Optimization, Characterization and Data Min-
ing in Prototype, Production and Field Environments
Description
The LTM®4676A is a dual 13A or single 26A step-down
µModule® (micromodule) DC/DC regulator with 70ms
turn-on time. It features remote configurability and
telemetry-monitoring of power management parameters
over PMBus— an open standard I2C-based digital interface
protocol . The LTM4676A is comprised of fast analog
control loops, precision mixed-signal circuitry, EEPROM,
power MOSFETs, inductors and supporting components.
The LTM4676A’s 2-wire serial interface allows outputs to
be margined, tuned and ramped up and down at program-
mable slew rates with sequencing delay times. Input and
output currents and voltages, output power, temperatures,
uptime and peak values are readable. 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.
PART
NUMBER
LTM4676
LTM4676A
TURN-ON
START-UP TIME
(MAX) (ms)
170
70
VIN RANGE
(V)
4.5 to 26.5
4.5 to 17
VOUT RANGE (V)
0.5V to 4 (CH0)
0.5 to 5.4 (CH1)
0.5 to 5.5 (Both CH)
PIN-
COMPATIBLE
Yes
See Table 1 and page 22 for more on LTM4676A’s enhancements over
LTM4676's feature set.
L, LT, LTC, LTM, Linear Technology, the Linear logo, µModule 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.
Click to view associated Video Design Idea.
Typical Application
Dual 13A µModule Regulator with Digital
Interface for Control and Monitoring*
VIN
5.75V TO 17V
22µF
×3
ON/OFF CONTROL
FAULT INTERRUPTS,
POWER SEQUENCING
VIN0
VIN1
SVIN
VOUT0
VOSNS0+
RRGGUUPPIINNOO0101LTM4676VAVOVOSSONNUSST01–1
PWM CLOCK AND
TIME-BASE
SYNCHRONIZATION
REGISTER WRITE
PROTECTION
SYNC
SHARE_CLK
WP GND
*FOR COMPLETE CIRCUIT, SEE FIGURE 62
SGND
SCL
SDA
ALERT
4676A TA01a
LOAD0
LOAD1
VOUT0,
ADJUSTABLE
UP TO 13A
100µF
×7
VOUT1,
ADJUSTABLE
UP TO 13A
100µF
×7
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)
4676A TA01b
Input Current Readback
1.5 2.4
1.0 1.6
0.5 0.8
00
0 3 6 9 12
TIME (SEC)
4676A TA01d
Output Current Readback, Varying Load Pattern
15 15
10 10
55
00
0 3 6 9 12
TIME (SEC)
4676A TA01c
Power Stage Temperature Readback
60 60
57 57
54 54
51 51
0 3 6 9 12
TIME (SEC)
4676A TA01e
4676af
For more information www.linear.com/LTM4676A
1
1 page  
LTM4676A
E lectrical Characteristics The l denotes the specifications which apply over the specified internal
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f=ac1t2oVry,-RdeUfNanul=t
5V,
EEPROM
SYMBOL
PARAMETER
CONDITIONS
MIN TYP MAX UNITS
tDELAY(0ms)
∆VOUTn (LS)
Turn-On Delay Time
Peak Output Voltage
Deviation for Dynamic
Load Step
TMTOimFNRe__fDGroEPmLIOAFY_iPnrsR=tO0RPmisAsiGn,gATTOEEdNng_=eRo0ISfxE0Rn1U0=N03n,mtos,Rising Edge of GPIOn.
VMIFNRH_aGvPinIgO_BReeEnSPEOstNaSblEisnh=ed0xf0o0r 0a0t .Least 70ms
Load: 0A to 6.5A and 6.5A to 0A at 6.5A/µs, Figure 62 Circuit,
VOUTn = 1V, VIN = 12V (Note 12)
l 2.75 3.1 3.5
ms
50 mV
tSETTLE
IOUTn(OCL_PK)
Settling Time for
Dynamic Load Step
Output Current Limit,
Peak
Load: 0A to 6.5A and 6.5A to 0A at 6.5A/µs, Figure 62 Circuit,
VOUTn = 1V, VIN = 12V (Note 12)
Cycle-by-Cycle Inductor Peak Current Limit Inception
35 µs
22.5 A
IOUTn(OCL_AVG)
Output Current Limit,
Time Averaged
Time-Averaged Output Inductor Current Limit Inception Threshold,
Commanded by IOUT_OC_FAULT_LIMITn (Note 12)
15.6A; See IO-RB-ACC
Specification (Output Current
Readback Accuracy)
Control Section
VFBCM0
VFBCM1
VOUT-RNG0
Channel 0 Feedback Input
Common Mode Range
VVOOSSNNSS00+–
Valid
Valid
Input
Input
Range
Range
(Referred
(Referred
to
to
SGND)
SGND)
Channel 1 Feedback Input SGND Valid Input Range (Referred to GND)
Common Mode Range VOSNS1 Valid Input Range (Referred to SGND)
Full-Scale Command
Voltage, Range 0
(Notes 7, 15)
VOUTn Commanded to 5.500V, MFR_PWM_MODEn[1] = 0b
Resolution
LSB Step Size
l –0.1
l
l –0.3
l
0.3
5.7
0.3
5.7
5.422
5.576
12
1.375
V
V
V
V
V
Bits
mV
VOUT-RNG1
Full-Scale Command
Voltage, Range 1
(Notes 7, 15)
VROeUsoTnluCtioomn manded to 2.750V, MFR_PWM_MODEn[1] = 1b
LSB Step Size
2.711
2.788
12
0.6875
V
Bits
mV
RVSENSE0+
VOSNS0+ Impedance to
SGND
0.05V ≤ VVOSNS0+ – VSGND ≤ 5.5V
41 kΩ
RVSENSE1
VOSNS1 Impedance to
SGND
0.05V ≤ VVOSNS1 – VSGND ≤ 5.5V
37 kΩ
tON(MIN)
Minimum On-Time
(Note 8 )
90 ns
Analog OV/UV (Overvoltage/Undervoltage) Output Voltage Supervisor Comparators (VOUT_OV/UV_FAULT_LIMIT and VOUT_OV/UV_WARN_LIMIT Monitors)
NOV/UV_COMP
Resolution, Output
Voltage Supervisors
(Note 15)
8 Bits
VOV-RNG
VOU-STP
Output OV Comparator
Threshold Detection
Range
Output OV and UV
Comparator Threshold
Programming LSB Step
Size
(Note 15)
High
Low
Range
Range
Scale,
Scale,
MMFFRR__PPWWMM__MMOODDEEnn[[11]]
=
=
0b
1b
(Note 15)
High Range Scale, MFR_PWM_MODEn[1] = 0b
Low Range Scale, MFR_PWM_MODEn[1] = 1b
1 5.6
0.5 2.7
22
11
V
V
mV
mV
For more information www.linear.com/LTM4676A
4676af
5
5 Page 
LTM4676A
Typical Performance Characteristics TA = 25°C, 12VIN to 1VOUT, unless otherwise noted.
Efficiency vs Load Current at 5VIN
100
Efficiency vs Load Current at 8VIN
100
Efficiency vs Load Current at 12VIN
100
95 95 95
90 90 90
85 85 85
80
75
3.3VOUT, 425kHz
2.5VOUT, 425kHz
70
1.8VOUT, 425kHz
1.5VOUT, 350kHz
65
1.2VOUT, 350kHz
1.0VOUT, 350kHz
60 0.9VOUT, 350kHz
0 2 4 6 8 10 12 14 16 18 20 22 24 26
OUTPUT CURRENT (A)
4676A G01
80 5.0VOUT, 500kHz
75
3.3VOUT, 575kHz
2.5VOUT, 500kHz
70
1.8VOUT, 425kHz
1.5VOUT, 350kHz
65
1.2VOUT, 350kHz
1.0VOUT, 350kHz
60 0.9VOUT, 350kHz
0 2 4 6 8 10 12 14 16 18 20 22 24 26
OUTPUT CURRENT (A)
4676A G02
80 5.0VOUT, 750kHz
75
3.3VOUT, 650kHz
2.5VOUT, 575kHz
70
1.8VOUT, 500kHz
1.5VOUT, 425kHz
65
1.2VOUT, 350kHz
1.0VOUT, 350kHz
60 0.9VOUT, 350kHz
0 2 4 6 8 10 12 14 16 18 20 22 24 26
OUTPUT CURRENT (A)
4676A G03
Single Phase Single Output
Pulse-Skipping (Discontinuous)
Mode Efficiency,
VMIFNR=_SPVWINM=_MVIONnD,EInN[T0V]C=C
Open,
0b
90
Dual Phase Single Output Load
Transient Response,12VIN to 1VOUT
Single Phase Single Output Load
Transient Response,12VIN to 1VOUT
VOUT
VOUT0
80
50mV/DIV
50mV/DIV
AC-COUPLED
AC-COUPLED
70
60
50
12VIN TO 1.5VOUT, 425kHz
40
0 1 2 3 4 5 6 7 8 9 10 11 12 13
OUTPUT CURRENT (A)
4676A G04
Dual Phase Single Output Load
Transient Response, 5VIN to 1VOUT
IOUT
8A/DIV
40µs/DIV
4676A G05
FIGURE 29 CIRCUIT AT 12VIN, INTVCC PIN
OPEN CIRCUIT AND VOUT_COMMANDn SET
TO 1.000V. 0A TO 20A LOAD STEP AT 20A/µs
Dual Output Concurrent Rail
Start-Up/Shutdown
IOUT
4A/DIV
40µs/DIV
FIGURE 62 CIRCUIT AT 12VIN
0A TO 10A LOAD STEP AT 10A/µs
4676A G06
Dual Output Start-Up/Shutdown
with a Pre-Biased Load
VOUT
50mV/DIV
AC-COUPLED
IOUT
8A/DIV
40µs/DIV
FIGURE 29 CIRCUIT AT 5VIN,
VOUT_COMMANDn SET TO 1.000V.
0A TO 20A LOAD STEP AT 20A/µs
VOUT0,
VOUT1
500mV/DIV
VOUT0, VOUT1
500mV/DIV
IOUT0
5A/DIV
IDIODE
1mA/DIV
RUN0, RUN1
5V/DIV
RUN0, RUN1
5V/DIV
4676A G07
2ms/DIV
4676A G08
FIGURE 62 CIRCUIT AT 12VIN, 77mΩ LOAD
ON VOUT0, NO LOAD ON VOUT1.
TON_RISE0 = 3ms, TON_RISE1 = 5.297ms,
TOFF_DELAY1 = 0ms, TOFF_DELAY0 = 2.43ms,
TOFF_FALL1 = 5.328ms, TOFF_FALL0 = 3ms,
ON_OFF_CONFIGn = 0x1E
2ms/DIV
4676A G09
FIGURE 62 CIRCUIT AT 12VIN, 77mΩ LOAD ON
VOUT0, 500Ω ON VOUT1. VOUT1 PRE-BIASED
THROUGH A DIODE. TON_RISE0 = 3ms,
TON_RISE1 = 5.297ms, TOFF_DELAY1 = 0ms,
TOFF_DELAY0 = 2.43ms, TOFF_FALL1 = 5.328ms,
TOFF_FALL0 = 3ms, ON_OFF_CONFIG1 = 0x1F
ON_OFF_CONFIG0 = 0x1E
4676af
For more information www.linear.com/LTM4676A
11
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet LTM4676A.PDF ] | |
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