LTM4676A_15 Datasheet, PDF (1/130 Pages) Linear Technology – Dual 13A or Single 26A Module Regulator with Digital Power System Management

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 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 _{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
V_IN RANGE
(V)
4.5 to 26.5
4.5 to 17
V_OUT 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*
V_IN
5.75V TO 17V
22µF
×3
ON/OFF CONTROL
FAULT INTERRUPTS,
POWER SEQUENCING
V_IN0
V_IN1
SV_IN
V_OUT0
V_OSNS0⁺
RUN₀
RUN₁
V_OSNS0–
LTM4676A
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 62
SGND
SCL
SDA
ALERT
4676A TA01a
LOAD₀
LOAD₁
V_OUT0,
ADJUSTABLE
UP TO 13A
100µF
×7
V_OUT1,
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
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
1.5
2.4
1.0
1.8
1.0
1.6
0.9
1.7
0.5
0.8
0.8
0
1.6
3
6
9
12
TIME (SEC)
4676A TA01b
0
0
0
3
6
9
12
TIME (SEC)
4676A TA01d
Output Current Readback, Varying Load Pattern
15
15
10
10
5
5
0
0
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
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