Datasheet LTM4615 (Analog Devices)

LTM4615 Triple Output, Low Voltage DC/DC µModule Regulator
FeaTures DescripTion
n
Dual 4A Output Power Supply with 1.5A VLDO™
The LTM®4615 is a complete 4A dual output switching n Short-Circuit and Overtemperature Protection mode DC/DC power supply plus an additional 1.5A VLDO n Power Good Indicators (very low dropout) linear regulator. Included in the pack- age are the switching controllers, power FETs, inductors,
Switching Regulators Section—Current Mode Control
n a 1.5A regulator and all support components. The dual 4A
Input Voltage Range: 2.375V to 5.5V
n DC/DC converters operate over an input voltage range of
4A DC Typical, 5A Peak Output Current Each
n 2.375V to 5.5V, and the VLDO operates from a 1.14V to
0.8V Up to 5V Output Each, Parallelable
n 3.5V input. The LTM4615 supports output voltages rang- ±
2% Total DC Output Error
n ing from 0.8V to 5V for the DC/DC converters, and 0.4V
Output Voltage Tracking
n to 2.6V for the VLDO. The three regulator output voltages Up to 95% Efficiency n are set by a single resistor for each output. Only bulk input Programmable Soft-Start and output capacitors are needed to complete the design.
VLDO Section
n
VLDO, 1.14V to 3.5V Input Range
The low profile package (2.82mm) enables utilization of n
VLDO, 0.4V to 2.6V, 1.5A Output
unused space on the bottom of PC boards for high density n
VLDO, 40dB Supply Rejection at f
point of load regulation. High switching frequency and a
SW
n ±
1% Total DC Output Error
current mode architecture enables a very fast transient n Small and Very Low Profile Package: response to line and load changes without sacrificing 15mm × 15mm × 2.82mm stability. The device supports output voltage tracking for supply rail sequencing.
applicaTions
Additional features include overvoltage protection, over- n Telecom and Networking Equipment current protection, thermal shutdown and programmable n Industrial Power Systems soft-start. The power module is offered in a space saving n Low Noise Applications and thermally enhanced 15mm × 15mm × 2.82mm LGA n FPGA, SERDES Power package. The LTM4615 is RoHS compliant with Pb-free finish. 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 Efficiency vs Output Current 1.2V at 4A, 1.5V at 4A and 1V at 1A DC/DC µModule
®
Regulator
91 VIN = 3.3V V 89 IN 3V TO 5.5V PGOOD1 PGOOD2 87 V 10µF 10µF OUT2 1.5V 6.3V 6.3V V 85 10k IN1 VIN2 10k V PGOOD1 OUT1 PGOOD2 VOUT2 83 V 1.2V V OUT1 OUT1 V 1.5V OUT2 VOUT3 1.2V 4A FB1 LTM4615 4A 22µF FB2 EFFICIENCY (%) 81 1V 6.3V VIN TRACK1 (V 10k TRACK2 V 22µF IN 5.76k IN = 1.2V) RUN/SS1 VOUT3 6.3V RUN/SS2 79 1V AT 1A 100µF 1.2V LDO_IN LDO_OUT 100µF 6.3V 10µF 77 EN3 FB3 6.3V 6.3V PGOOD3 PGOOD3 3.32k 75 10µF GND1 GND2 GND3 10k 0 1 2 3 4 4615 TA01a V OUTPUT CURRENT (A) OUT3 4615 TA01b 4615fb For more information www.linear.com/LTM4615 1 Document Outline Features Description Applications Typical Application Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Typical Performance Characteristics Pin Functions Simplified Block Diagram Decoupling Requirements Operation Applications Information Package Description Revision History Package Photograph Related Parts