LTM4615_15 Datasheet, PDF (1/24 Pages) Linear Technology – Triple Output, Low Voltage DC/DC Module Regulator

LTM4615
Triple Output, Low Voltage
DC/DC µModule Regulator
Features
n _{Dual 4A Output Power Supply with 1.5A VLDO™}
n _{Short-Circuit and Overtemperature Protection}
n _{Power Good Indicators}
Switching Regulators Section—Current Mode Control
n _{Input Voltage Range: 2.375V to 5.5V}
n _{4A DC Typical, 5A Peak Output Current Each}
n _{0.8V Up to 5V Output Each, Parallelable}
n _{±2% Total DC Output Error}
n _{Output Voltage Tracking}
n _{Up to 95% Efficiency}
n _{Programmable Soft-Start}
VLDO Section
n _{VLDO, 1.14V to 3.5V Input Range}
n _{VLDO, 0.4V to 2.6V, 1.5A Output}
n _{VLDO, 40dB Supply Rejection at fSW}
n _{±1% Total DC Output Error}
n _{Small and Very Low Profile Package:}
15mm × 15mm × 2.82mm
Applications
n _{Telecom and Networking Equipment}
n _{Industrial Power Systems}
n _{Low Noise Applications}
n _{FPGA, SERDES Power}
L, LT, LTC, LTM, Linear Technology, the Linear logo, µModule and PolyPhase are registered
trademarks and VLDO and LTpowerCAD are trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners. Protected by U.S. Patents
including 5481178, 6580258, 6304066, 6127815, 6498466, 6611131, 6724174.
Description
The LTM^®4615 is a complete 4A dual output switching
mode DC/DC power supply plus an additional 1.5A VLDO
(very low dropout) linear regulator. Included in the pack-
age are the switching controllers, power FETs, inductors,
a 1.5A regulator and all support components. The dual 4A
DC/DC converters operate over an input voltage range of
2.375V to 5.5V, and the VLDO operates from a 1.14V to
3.5V input. The LTM4615 supports output voltages rang-
ing from 0.8V to 5V for the DC/DC converters, and 0.4V
to 2.6V for the VLDO. The three regulator output voltages
are set by a single resistor for each output. Only bulk input
and output capacitors are needed to complete the design.
The low profile package (2.82mm) enables utilization of
unused space on the bottom of PC boards for high density
point of load regulation. High switching frequency and a
current mode architecture enables a very fast transient
response to line and load changes without sacrificing
stability. The device supports output voltage tracking for
supply rail sequencing.
Additional features include overvoltage protection, over-
current protection, thermal shutdown and programmable
soft-start. The power module is offered in a space saving
and thermally enhanced 15mm × 15mm × 2.82mm LGA
package. The LTM4615 is RoHS compliant with Pb-free
finish.
Typical Application
V_OUT1
1.2V
4A
1.2V at 4A, 1.5V at 4A and 1V at 1A DC/DC µModule^® Regulator
PGOOD1
10µF
6.3V
10k
22µF
6.3V
10k ^VIN
100µF 1.2V
6.3V
10µF
V_IN 3V TO 5.5V
V_IN1
PGOOD1
V_OUT1
FB1
TRACK1
RUN/SS1
LDO_IN
EN3
GND1
LTM4615
GND2
V_IN2
PGOOD2
V_OUT2
FB2
TRACK2
RUN/SS2
LDO_OUT
FB3
PGOOD3
GND3
PGOOD2
10µF
6.3V
10k
V_{IN VOUT3}
1V AT 1A
PGOOD3
10k
V_OUT3
3.32k
5.76k
10µF
6.3V
100µF
6.3V
V_OUT2
1.5V
4A
22µF
6.3V
4615 TA01a
For more information www.linear.com/LTM4615
Efficiency vs Output Current
91
V_IN = 3.3V
89
87
V_OUT2
1.5V
85
83
V_OUT3
81
1V
(V_IN = 1.2V)
79
V_OUT1
1.2V
77
75
0
1
2
3
4
OUTPUT CURRENT (A)
4615 TA01b
4615fb
1