LTM4611 Datasheet, PDF (1/28 Pages) Linear Technology – Ultralow VIN, 15A DC/DC μModule Regulator

LTM4611
Ultralow V_IN, 15A DC/DC
µModule Regulator
Features
n _{Complete Switch Mode Power Supply}
n _{Input Voltage Range: 1.5V to 5.5V}
n _{15A DC Output}
n _{Output Voltage Range: 0.8V to 5V}
n _{±1.5% Total DC Output Error}
n _{Differential Remote Sensing for Precision}
Regulation
n _{Current Mode Control/ Fast Transient Response}
n _{Overcurrent Foldback Protection}
n _{Parallel Multiple LTM}^®_{4611s for Current Sharing}
n _{Frequency Synchronization}
n _{Selectable Pulse-Skipping or Burst Mode}^® _Operation
n _{Soft-Start/Voltage Tracking}
n _{Up to 94% Efficiency}
n _{Output Overvoltage Protection}
n _{Small 15mm × 15mm × 4.32mm LGA Package}
Applications
n _{Telecom Servers and Networking Equipment}
n _{Storage and ATCA Cards}
n _{General Purpose Point of Load Regulation}
Description
The LTM4611 is a high density 15A output, switch mode
DC/DC buck converter power supply capable of operating
from very low voltage input supplies. Included in the pack-
age are the buck switching controller, power FETs, induc-
tor and loop-compensation components. The LTM4611
delivers up to 15A continuous current at high efficiency
from an input voltage of 1.5V_IN up to 5.5V_IN. The output
voltage is set between 0.8V and 5V by a resistor. Only a
few input and output capacitors are needed.
High switching frequency and a current mode architecture
enable a very fast transient response to line and load
changes without sacrificing stability. The device supports
frequency synchronization, multiphase/current sharing
operation, Burst Mode operation and output voltage
tracking for supply rail sequencing.
The LTM4611 is available in a thermally enhanced 15mm
× 15mm × 4.32mm LGA package. The LTM4611 is PB-free
and RoHS compliant.
L, LT, LTC, LTM, Linear Technology, the Linear logo, Burst Mode, PolyPhase and µModule are
registered trademarks of Linear Technology Corporation. All other trademarks are the property
of their respective owners. Protected by U.S. Patents, including 5481178, 5847554, 6580258,
6304066, 6476589, 6774611, 6677210.
Typical Application
1.5V_IN to 5.5V_IN, 15A Step-Down DC/DC µModule^® Regulator
V_IN
1.5V TO 5.5V
22µF
s3
C_SS
0.1µF
V_IN
PGOOD
TRACK/SS
V_OUT
LTM4611
V_FB
RUN
V_{OUT_LCL}
MODE_PLLIN
SGND
DIFFV_OUT
V_OSNS+
V_OSNS–
GND
V_OUT^**
STEP-DOWN
C_FF* 15A
100µF*
s4
C_P* R_FB**
4611 TA01
*SEE TABLE 5
**SEE TABLE 1
Efficiency vs Load Current
96
94
92
90
88
86
84
82
80
78
0
5
10
LOAD CURRENT (A)
15
4611 TA01b
5V_IN, 3.3V_OUT
3.3V_IN, 2.5V_OUT
2.5V_IN, 1.5V_OUT
2.5V_IN, 1.2V_OUT
3.3V_IN, 1V_OUT
1.5V_IN, 0.9V_OUT
5V_IN, 1V_OUT
4611f