Datasheet LTM4608A (Analog Devices) - 5

LTM4608A
TYPICAL PERFORMANCE CHARACTERISTICS Efficiency vs Load Current Efficiency vs Load Current Efficiency vs Load Current
100 100 100 CONTINUOUS MODE CONTINUOUS MODE CONTINUOUS MODE 95 95 95 90 90 90 85 85 85 EFFICIENCY (%) 80 EFFICIENCY (%) 80 EFFICIENCY (%) 80 5VIN 1.2VOUT 5VIN 1.5VOUT 3.3VIN 1.2VOUT 75 5VIN 1.8VOUT 75 3.3VIN 1.5VOUT 75 2.7VIN 1.0VOUT 5VIN 2.5VOUT 3.3VIN 1.8VOUT 2.7VIN 1.5VOUT 5VIN 3.3VOUT 3.3VIN 2.5VOUT 2.7VIN 1.8VOUT 70 70 70 0 2 4 6 8 0 2 4 6 8 0 1 2 3 4 5 6 7 LOAD CURRENT LOAD CURRENT LOAD CURRENT (A) 4608A G01 4608A G02 4608A G03
Burst Mode Efficiency with 5V Input VIN to VOUT Step-Down Ratio VIN to VOUT Step-Down Ratio
100 4.0 4.0 3.5 3.5 90 3.0 3.0 80 2.5 2.5 (V) (V) 70 2.0 2.0 V OUT V OUT 1.5 1.5 EFFICIENCY (%) 60 1.0 1.0 VOUT = 1.5V IOUT = 8A VOUT = 1.8V 50 IOUT = 6A VOUT = 1.8V VOUT = 2.5V 0.5 VOUT = 1.2V VOUT = 2.5V 0.5 VOUT = 1.2V VOUT = 2.5V VOUT = 3.3V VOUT = 1.5V VOUT = 3.3V VOUT = 1.5V VOUT = 3.3V 40 0 0 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 1.1 2 3 4 5 6 2 3 4 5 6 LOAD CURRENT (A) VIN (V) VIN (V) 4608A G04 4608A G05 4608A G06
Supply Current vs VIN Load Transient Response Load Transient Response
1.6 1.4 ILOAD 1A/DIV 1.2 ILOAD VO = 1.2V PULSE-SKIPPING MODE VIN 2A/DIV 1 2V/DIV VOUT VOUT 0.8 20mV/DIV 20mV/DIV AC COUPLED AC COUPLED Y CURRENT (mA) 0.6 VO = 1.2V BURST MODE SUPPL 0.4 V 4608A G08 4608A G09 IN = 5V 20µs/DIV VIN = 5V 20µs/DIV 0.2 VOUT = 3.3V, RFB = 2.21k VOUT = 2.5V, RFB = 3.09k 2A/µs STEP 2.5A/µs STEP 0 COUT = 100µF X5R COUT = 100µF X5R 2.5 3 3.5 4 4.5 5 5.5 C1 = 100pF, C3 = 22pF FROM FIGURE 18 C1 = 120pF, C3 = 47pF FROM FIGURE 18 INPUT VOLTAGE (V) 4608A G07 4608afe For more information www.linear.com/LTM4608A 5 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