Datasheet LTM4615 (Analog Devices) - 9

LTM4615
siMpliFieD block DiagraM Switching Regulator Block Diagram
PGOOD VIN VIN 2.375V TO 5.5V 4.7µF 22µF 6.3V 6.3V RSS 1M RUN/SS CSS CSSEXT 1000pF M1 0.47µH V V CONTROL, DRIVE OUT OUT TRACK 4.99k TRACK 1.5V POWER FETS SUPPLY 470pF 4.7µF 4A M2 5.76k COMP 6.3V 22µF RFBHI 6.3V INTERNAL 4.99k ×3 COMP GND FB SW R 4615 F01a FB 5.76k
VLDO Block Diagram
BOOST3 5V BOOST LDO_IN V 4.7µF IN 1.14V TO 3.5V 4.7µF 10µF 0.4V + GND3 6.3V GND3 – LDO_OUT V CONTROL OUT 1V GND3 4.7µF EN3 10µF 1.5A LDO_RHI 6.3V ENABLE 4.99k GND3 FB3 PGOOD3 RFBLDO POWER GOOD 3.32k GND3 10k 4615 F01b GND 1V
Figure 1. Simplified LTM4615 Block Diagram of Each Switching Regulator Channel and the VLDO Decoupling requireMenTs TA = 25°C. Use Figure 1 configuration for each channel. SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
CIN External Input Capacitor Requirement IOUT = 4A 22 µF (VIN = 2.375V to 5.5V, VOUT = 1.5V) COUT External Output Capacitor Requirement IOUT = 4A 66 100 µF (VIN = 2.375V to 5.5V, VOUT = 1.5V) LDO_IN LDO Input Capacitance IOUT = 1A 4.7 10 µF LDO_OUT LDO Output Capacitance IOUT = 1A 10 µF 4615fb For more information www.linear.com/LTM4615 9 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