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LTM4615 Datasheet, PDF (1/24 Pages) Linear Technology – Triple Output, Low Voltage DC/DC μModule Regulator | |||
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LTM4615
Triple Output, Low Voltage
DC/DC µModule Regulator
FEATURES
n Dual 4A Output Power Supply with 1.5A VLDOâ¢
n Short-Circuit and Overtemperature Protection
n Power Good Indicators
Switching Regulators SectionâCurrent 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% Efï¬ciency
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 Proï¬le Package:
15mm à 15mm à 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 and μModule are registered trademarks of
Linear Technology Corporation. VLDO is a trademark 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 package 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 ranging 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 proï¬le 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 sacriï¬cing
stability. The device supports output voltage tracking for
supply rail sequencing.
Additional features include overvoltage protection,
foldback overcurrent protection, thermal shutdown and
programmable soft-start. The power module is offered in
a space saving and thermally enhanced 15mm à 15mm
à 2.82mm LGA package. The LTM4615 is Pb-free and
RoHS compliant.
TYPICAL APPLICATION
VOUT1
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
VIN 3V TO 5.5V
VIN1
PGOOD1
VOUT1
FB1
TRACK1
RUN/SS1
LDO_IN
EN3
GND1
LTM4615
GND2
VIN2
PGOOD2
VOUT2
FB2
TRACK2
RUN/SS2
LDO_OUT
FB3
PGOOD3
GND3
PGOOD2
10μF
6.3V
10k
VIN VOUT3
1V AT 1A
PGOOD3
10k
VOUT3
3.32k
5.76k
10μF
6.3V
100μF
6.3V
VOUT2
1.5V
4A
22μF
6.3V
4615 TA01a
Efï¬ciency vs Output Current
91
VIN = 3.3V
89
87
VOUT2
1.5V
85
83
VOUT3
81
1V
(VIN = 1.2V)
79
VOUT1
1.2V
77
75
0
1
2
3
4
LOAD CURRENT (A)
4615 TA01b
4615f
1
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