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Analog Devices Semiconductor Electronic Components Datasheet

LTC3886EUKG Datasheet

60V Dual Output Step-Down Controller

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LTC3886/LTC3886-1
60V Dual Output
Step-Down Controller with Digital
Power System Management
FEATURES
DESCRIPTION
n PMBus/I2C Compliant Serial Interface
n Telemetry Read-Back Includes VIN, IIN, VOUT, IOUT,
Temperature and Faults
n Programmable Voltage, Current Limit, Digital
Soft-Start/Stop, Sequencing, Margining, OV/UV/OC,
Frequency, and Control Loop Compensation
n Output Error Less Than ±0.5% Over Temperature
n Integrated 16-Bit ADC and 12-Bit DAC
n Integrated High Side Current Sense Amplifier
n Internal EEPROM with ECC and Fault Logging
n Integrated N-Channel MOSFET Gate Drivers
Power Conversion
n Wide VIN Range: 4.5V to 60V
n VOUT0, VOUT1 Range: 0.5V to 13.8V
n Analog Current Mode Control
n Accurate PolyPhase® Current Sharing for
Up to 6 Phases (100kHz to 750kHz)
n Available in a 52-Lead (7mm × 8mm) QFN Package
APPLICATIONS
The LTC®3886/LTC3886-1 is a dual PolyPhase DC/DC syn-
chronous step-down switching regulator controller with
I2C-based PMBus compliant serial interface. This controller
employs a constant-frequency, current-mode architecture,
with high voltage input and output capability along with
programmable loop compensation. The LTC3886 is sup-
ported by the LTpowerPlay® software development tool with
graphical user interface (GUI).
The EXTVCC pin supports voltages up to 14V allowing for
optimized circuit efficiency and die temperature, and for
the controller output to supply the chip power. Switching
frequency, output voltage, and device address can be
programmed both by digital interface as well as external
configuration resistors. Parameters can be set via the
digital interface or stored in EEPROM. Both outputs have
an independent power good indicator and FAULT function.
The LTC3886 can be configured for discontinuous (pulse-
skipping) mode or continuous inductor current mode.
The LTC3886-1 also includes a sequencing off feature to
discharge very large output capacitors.
n Telecom, Datacom, and Storage Systems
n Industrial and Point of Load Applications
All registered trademarks and trademarks are the property of their respective owners. Protected
by U.S. Patents including 5481178, 5705919, 5929620, 6100678, 6144194, 6177787, 5408150,
6580258, 6304066, 7420359, 8786268 Patent Pending. Licensed under U.S. Patent 7000125
and other related patents worldwide.
TYPICAL APPLICATION
VOUT0
5V
15A
+
530µF
5mΩ
10µF
0.1µF
INTVCC VIN IIN+ IIN–
TG0
TG1
1µF
0.1µF
3.1µH
6.81k
1µF
10nF
BOOST0 BOOST1
SW0
SW1
PMBus
INTERFACE
BG0
BG1
LTC3886*
SDA
FAULT0
SCL
FAULT1
ALERT
PGOOD0
RUN0
PGOOD1
RUN1 SHARE_CLK
6.81k
ISENSE0+
0.22µF
ISENSE0–
ISENSE1+
ISENSE1–
EVVXSSEETNNVSSCEEC00+–
TSNS0
VSENSE1
TSNS1
ITH0
ITHR0
ITH1
ITHR1
4700pF
VDD33 GND VDD25
FAULT MANAGEMENT
TO/FROM
OTHER ADI DEVICES
0.22µF 7.5k
2200pF
10nF
220pF
1µF
1µF 220pF
10µF
VIN
18V TO 48V
6.82µH
7.5k
1µF
VOUT1
12V
15A
+
530µF
*SOME DETAILS OMITTED FOR CLARITY
3886 TA01a
Document Feedback
For more information www.analog.com
Efficiency and Power Loss
vs Load Current
100
9
90
VIN = 48V
VOUT = 12V
8
80 fSW = 150kHz
7
70
6
60
5
50
4
40
30
3
20
2
10
0
0.01
0.1
EFFICIENCY 1
POWER LOSS
0
1
10
100
LOAD CURRENT (A)
3883 TA01b
Rev G
1


Analog Devices Semiconductor Electronic Components Datasheet

LTC3886EUKG Datasheet

60V Dual Output Step-Down Controller

No Preview Available !

LTC3886/LTC3886-1
TABLE OF CONTENTS
Features...................................................... 1
Power Conversion.................................................1
Applications................................................. 1
Typical Application ......................................... 1
Description.................................................. 1
Absolute Maximum Ratings............................... 4
Order Information........................................... 4
Pin Configuration........................................... 4
Electrical Characteristics.................................. 5
Typical Performance Characteristics................... 10
Pin Functions............................................... 13
Block Diagram.............................................. 15
Operation................................................... 16
Overview.................................................................. 16
Main Control Loop................................................... 16
EEPROM.................................................................. 17
Power-Up and Initialization...................................... 17
Soft-Start................................................................. 18
Time-Based Sequencing.......................................... 18
Event-Based Sequencing......................................... 19
Shutdown................................................................ 19
Light-Load Current Operation..................................20
PWM Loop Compensation.......................................20
Switching Frequency and Phase..............................20
Output Voltage Sensing........................................... 21
Output Current Sensing........................................... 21
Input Current Sensing.............................................. 21
PolyPhase Load Sharing..........................................22
External/Internal Temperature Sense.......................22
RCONFIG (Resistor Configuration) Pins...................23
Fault Handling..........................................................23
Status Registers and ALERT Masking.................. 24
Mapping Faults to FAULT Pins.............................26
Power Good Pins.................................................26
CRC Protection ...................................................26
Serial Interface........................................................26
Communication Protection ................................. 27
Device Addressing................................................... 27
Responses to VOUT and IOUT Faults/Warnings......... 27
Output Overvoltage Fault Response.................... 27
Output Undervoltage Response .......................... 28
Peak Output Overcurrent Fault Response............ 28
Responses to Timing Faults..................................... 28
Responses to VIN OV Faults..................................... 28
Responses to OT/UT Faults...................................... 28
Internal Overtemperature Fault/Warn
Response............................................................. 28
External Overtemperature and Undertemperature
Fault Response ...................................................29
Responses to External Faults ..................................29
Fault Logging...........................................................29
Bus Timeout Protection...........................................29
Similarity Between PMBus, SMBus and I2C
2-Wire Interface.......................................................30
PMBus Serial Digital Interface.................................30
PMBus Command Summary............................. 35
PMBus Commands..................................................35
*Data Format...........................................................40
Applications Information................................. 41
Current Limit Programming..................................... 41
ISENSE+ and ISENSE– Pins.......................................... 41
Low Value Resistor Current Sensing........................ 42
Inductor DCR Current Sensing.................................43
Slope Compensation and Inductor Peak Current.....44
Inductor Value Calculation.......................................44
Inductor Core Selection...........................................45
Power MOSFET and Optional Schottky Diode
Selection.................................................................. 45
CIN and COUT Selection............................................46
Variable Delay Time, Soft-Start and Output Voltage
Ramping.................................................................. 46
Digital Servo Mode.................................................. 47
Soft Off (Sequenced Off).........................................48
INTVCC Regulator..................................................... 49
Topside MOSFET Driver Supply (CB, DB).................50
Undervoltage Lockout..............................................50
Rev G
2
For more information www.analog.com


Part Number LTC3886EUKG
Description 60V Dual Output Step-Down Controller
Maker Analog Devices
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