LTM4675_15 Datasheet, PDF (1/128 Pages) Linear Technology – Dual 9A or Single 18A Module Regulator with Digital Power System Management

LTM4675
Dual 9A or Single 18A
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 9A Load}
nn _{400kHz PMBus-Compliant I}²_{C 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 _{Drop-In Pin-Compatible to Dual 13A LTM4676A}
nn _{16mm × 11.9mm × 3.51mm 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^®4675 is a dual 9A or single 18A 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 LTM4675 is comprised of fast analog
control loops, precision mixed-signal circuitry, EEPROM,
power MOSFETs, inductors and supporting components.
The LTM4675’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 LTM4675 is offered in a 16mm × 11.9mm × 3.51mm
BGA package available with SnPb or RoHS compliant
terminal finish.
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 9A µModule Regulator with Digital
Interface for Control and Monitoring*
V_IN
5.75V TO 17V
22µF
×2
ON/OFF CONTROL
FAULT INTERRUPTS,
POWER SEQUENCING
V_IN0
V_IN1
SV_IN
V_OUT0
V_OSNS0⁺
RUN₀
RUN₁
V_OSNS0–
LTM4675
V_OUT1
GPIO₀
GPIO₁
V_OSNS1
PWM CLOCK AND
TIME-BASE
SYNCHRONIZATION
REGISTER WRITE
PROTECTION
SYNC
SHARE_CLK
WP _GND
*FOR COMPLETE CIRCUIT, SEE FIGURE 60
SGND
SCL
SDA
ALERT
4675 TA01a
LOAD₀
LOAD₁
V_OUT0,
ADJUSTABLE
UP TO 9A
100µF
×4
V_OUT1,
ADJUSTABLE
UP TO 9A
100µF
×4
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
V_OUT0/V_OUT1 During Load Pattern Tests. 10Hz Polling Rate. 12V_IN
Output Voltage Readback, V_OUT Margined 7.5% Low
1.1
1.9
Input Current Readback
1.0
2.0
1.0
1.8
0.5
1.0
0.9
1.7
0.8
0
1.6
3
6
9
12
TIME (s)
4675 TA01b
0
0
0
3
6
9
12
TIME (s)
4675 TA01d
Output Current Readback, Varying Load Pattern
10
10
5
5
0
0
0
3
6
9
12
TIME (s)
4675 TA01c
Power Stage Temperature Readback
60
60
57
57
54
54
51
51
0
3
6
9
12
TIME (SEC)
4675 TA01e
4675f
For more information www.linear.com/LTM4675
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