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LTM4615
Triple Output, Low Voltage
DC/DC μModule Regulator
Dual 4A Output Power Supply with 1.5A VLDO?
Telecom and Networking Equipment
Industrial Power Systems
Low Noise Applications
FPGA, SERDES Power
FEATURES
n
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 f SW
n ± 1% Total DC Output Error
n Small and Very Low Profile Package:
15mm × 15mm × 2.82mm
APPLICATIONS
n
n
n
n
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.
TYPICAL APPLICATION
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.
Efficiency vs Output Current
1.2V at 4A, 1.5V at 4A and 1V at 1A DC/DC μModule ? Regulator
V IN 3V TO 5.5V
91
89
V IN = 3.3V
V OUT1
1.2V
4A
22μF
6.3V
PGOOD1
10μF
6.3V
10k
10k
100μF 1.2V
6.3V
10μF
V IN
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
V OUT3
1V AT 1A
PGOOD3 3.32k
10k
V OUT3
10μF
6.3V
5.76k
100μF
6.3V
V OUT2
1.5V
4A
22μF
6.3V
4615 TA01a
87
85
83
81
79
77
75
0
V OUT2
1.5V
V OUT1
V OUT3 1.2V
1V
(V IN = 1.2V)
1 2 3
OUTPUT CURRENT (A)
4
4615 TA01b
1
For more information www.linear.com/LTM4615
4615fb
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