Datasheet LTM4643 (Analog Devices) - 5

LTM4643
TYPICAL PERFORMANCE CHARACTERISTICS 1.8V Output Transient Response 2.5V Output Transient Response 3.3V Output Transient Response
VOUT VOUT VOUT 50mV/DIV 50mV/DIV 50mV/DIV AC-COUPLED AC-COUPLED AC-COUPLED LOAD STEP LOAD STEP 1A/DIV LOAD STEP 1A/DIV 1A/DIV VIN = 12V 20µs/DIV 4643 G07 VIN = 12V 20µs/DIV 4643 G08 VIN = 12V 20µs/DIV 4643 G09 VOUT = 1.8V VOUT = 2.5V VOUT = 3.3V OUTPUT CAPACITOR = 1 × 47µF CERAMIC CAP OUTPUT CAPACITOR = 1 × 47µF CERAMIC CAP OUTPUT CAPACITOR = 1 × 47µF CERAMIC CAP LOAD STEP = 2A TO 3A WITH 1A/µS SLEW RATE LOAD STEP = 2A TO 3A WITH 1A/µS SLEW RATE LOAD STEP = 2A TO 3A WITH 1A/µS SLEW RATE FEED FORWARD CAP = 100pF FEED FORWARD CAP = 100pF FEED FORWARD CAP = 100pF
Short-Circuit with No Load Start-Up with No Load Applied Start-Up with 3A Load Applied Applied
IIN IIN IIN 0.5A/DIV 0.5A/DIV 0.5A/DIV VOUT 0.5V/DIV VOUT VOUT 0.5V/DIV 0.5V/DIV VIN = 12V 5ms/DIV 4643 G10 VIN = 12V 5ms/DIV 4643 G11 VIN = 12V 5ms/DIV 4643 G12 VOUT = 1.5V VOUT = 1.5V VOUT = 1.5V INPUT CAPACITOR = 1 × 22µF CERAMIC CAP INPUT CAPACITOR = 1 × 22µF CERAMIC CAP INPUT CAPACITOR = 1 × 22µF CERAMIC CAP OUTPUT CAPACITOR = 1 × 47µF CERAMIC CAP OUTPUT CAPACITOR = 1 × 47µF CERAMIC CAP OUTPUT CAPACITOR = 1 × 47µF CERAMIC CAP SOFT START = 0.1µF SOFT START = 0.1µF
Short-Circuit with 3A Load Short-Circuit with 3A Load Applied Applied Output Ripple
IIN IIN 0.5A/DIV 0.5A/DIV VOUT V 5mV/DIV OUT VOUT 0.5V/DIV AC-COUPLED 0.5V/DIV 350kHz BANDWIDTH VIN = 12V 20µs/DIV 4643 G13 VIN = 12V 20µs/DIV 4643 G14 VIN = 12V 2µs/DIV 4643 G15 VOUT = 1.5V VOUT = 1.5V VOUT = 1.5V INPUT CAPACITOR = 1 × 22µF CERAMIC CAP INPUT CAPACITOR = 1 × 22µF CERAMIC CAP OUTPUT CAPACITOR = 2 × 47µF CERAMIC CAP OUTPUT CAPACITOR = 1 × 47µF CERAMIC CAP OUTPUT CAPACITOR = 1 × 47µF CERAMIC CAP Rev D For more information www.analog.com 5 Document Outline Features Applications Description Typical Application Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Decoupling Requirements Operation Applications Information Typical Applications Package Description Package Photo Related Parts