Datasheet LTM4608A (Analog Devices) - 9

LTM4608A
SIMPLIFIED BLOCK DIAGRAM
SVIN INTERNAL VIN VIN FILTER TRACK + 2.7 TO 5.5V 10µF 10µF 10µF CIN MGN BSEL M1 SW PGOOD MODE 0.22µH POWER VOUT V RUN OUT CONTROL 1.5V CLKIN CLKOUT 22µF 22pF COUT M2 PHMODE GND ITH INTERNAL 10k COMP PLLLPF FB RFB INTERNAL 6.65k FILTER ITHM SGND 4608A BD
Figure 1. Simplified LTM4608A Block Diagram Table 1. Decoupling Requirements. TA = 25°C, Block Diagram Configuration SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
CIN External Input Capacitor Requirement IOUT = 8A 10 µF (VIN = 2.7V to 5.5V, VOUT = 1.5V) COUT External Output Capacitor Requirement IOUT = 8A 100 µF (VIN = 2.7V to 5.5V, VOUT = 1.5V)
OPERATION
The LTM4608A is a standalone nonisolated switch mode The LTM4608A has an integrated constant frequency cur- DC/DC power supply. It can deliver up to 8A of DC output rent mode regulator and built-in power MOSFET devices current with few external input and output capacitors. with fast switching speed. The typical switching frequency This module provides precisely regulated output voltage is 1.5MHz. For switching noise sensitive applications, it programmable via one external resistor from 0.6V DC to can be externally synchronized from 0.75MHz to 2.25MHz. 5.0V DC over a 2.7V to 5.5V input voltage. The typical Even spread spectrum switching can be implemented in application schematic is shown in Figure 18. the design to reduce noise. 4608afe For more information www.linear.com/LTM4608A 9 Document Outline Features Applications Description Typical Application Absolute Maximum Ratings Order Information Typical Performance Characteristics Pin Functions Simplified Block Diagram Operation Applications Information Typical Applications Package Description Package Photo Revision History Package Description Related Parts