LTM4623_15 Datasheet, PDF (1/26 Pages) Linear Technology – Ultrathin 20VIN, 3A Step-Down DC/DC Module Regulator

LTM4623
Ultrathin 20V_IN, 3A Step-Down
DC/DC µModule Regulator
Features
nn _{<2mm Height, Complete Solution in <1cm}²
(Single-Sided PCB) or 0.5cm² (Dual-Sided PCB)
nn _{Wide Input Voltage Range: 4V to 20V}
nn _{Input Voltage Down to 2.375V with External Bias}
nn _{0.6V to 5.5V Output Voltage}
nn _{3A DC Output Current}
nn _{±1.5% Maximum Total DC Output Voltage Error}
nn _{Current Mode Control, Fast Transient Response}
nn _{Low EMI EN55022 Class B Compliant}
nn _{External Frequency Synchronization}
nn _{Multiphase Operation with Current Sharing}
nn _{Output Voltage Tracking}
nn _{Selectable Discontinuous Mode}
nn _{Power Good Indicator}
nn _{Overvoltage, Overcurrent and Overtemperature Pro-}
tection
nn _{Ultrathin 6.25mm × 6.25mm × 1.82mm LGA Package}
Applications
nn _{PCIe and Backside PCB Mounting}
nn _{Telecom, Datacom, Networking and Industrial}
Equipment
nn _{Data Storage Rack Units and Cards}
Description
The LTM^®4623 is a complete 3A step-down switching
mode µModule (micromodule) regulator in a tiny ultrathin
6.25mm × 6.25mm × 1.82mm LGA package. Included in the
package are the switching controller, power FETs, inductor
and support components. Operating over an input voltage
range of 4V to 20V or 2.375V to 20V with an external bias
supply, the LTM4623 supports an output voltage range
of 0.6V to 5.5V, set by a single external resistor. Its high
efficiency design delivers 3A continuous output current.
Only ceramic input and output capacitors are needed.
The LTM4623 supports selectable discontinuous mode
operation and output voltage tracking for supply rail se-
quencing. Its high switching frequency and current mode
control enable a very fast transient response to line and
load changes without sacrificing stability.
Fault protection features include overvoltage, overcurrent
and overtemperature protection.
The LTM4623 is RoHS compliant with Pb free finish.
L, LT, LTC, LTM, µModule, Linear Technology and the Linear logo are registered trademarks
and LTpowerCAD is a trademark of Linear Technology Corporation. All other trademarks are the
property of their respective owners.
Typical Application
3A, 1.5V Output DC/DC µModule^® Step-Down Regulator
V_IN
4V TO 20V
10µF
25V
0.1µF
CLKIN CLKOUT
V_IN
V_OUT
SV_IN
RUN _LTM4623
INTV_CC
PGOOD
MODE
COMP
PHMODE
FB
TRACK/SS
FREQ
GND SGND
V_OUT
1.5V
47µF _3A
6.3V
40.2k
4623 TA01a
1.5V Output Efficiency vs Load Current
95
90
85
80
75
70
65
V_IN = 5V
V_IN = 12V
60
0 0.5 1 1.5 2 2.5 3
LOAD CURRENT (A)
4623 TA01b
For more information www.linear.com/LTM4623
4623fa
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