Datasheet LTM4639 (Analog Devices) - 5

LTM4639
TYPICAL PERFORMANCE CHARACTERISTICS 2.5V Input Efficiency Graph 3.3V Efficiency Graph 5V Efficiency Graph
100 100 100 95 95 95 90 90 90 85 85 85 EFFICIENCY (%) 5V TO 3.3V 80 EFFICIENCY (%) 80 EFFICIENCY (%) 3.3V TO 2.5V 80 5V TO 2.5V 2.5V TO 1.8V 3.3V TO 1.8V 5V TO 1.8V 75 2.5V TO 1.5V 75 3.3V TO 1.5V 75 5V TO 1.5V CPWR = 5V 2.5V TO 1.2V C 3.3V TO 1.2V PWR = 5V C 5V TO 1.2V PWR = VIN FREQ = 350kHz 2.5V TO 1V FREQ = 400kHz 3.3V TO 1V FREQ = 500kHz 5V TO 1V 70 70 70 0 2 4 6 8 10 12 14 16 18 20 0 2 4 6 8 10 12 14 16 18 20 0 2 4 6 8 10 12 14 16 18 20 OUTPUT CURRENT (A) OUTPUT CURRENT (A) OUTPUT CURRENT (A) 4637 G01 4639 G02 4639 G03
2.5V to 1V with 7.5A/µs Load 2.5V to 1.2V with 7.5A/µs Load 7V Efficiency Graph Step, CPWR = 5V Step, CPWR = 5V
100 95 VOUT VOUT VP-P = 80mV VP-P = 80mV 90 85 LOAD LOAD 7V TO 5V STEP STEP EFFICIENCY (%) 80 7V TO 3.3V 0A TO 7.5A 0A TO 7.5A 7V TO 2.5V 7V TO 1.8V 75 7V TO 1.5V 4639 G05 4639 G06 CPWR = VIN 7V TO 1.2V 50µs/DIV 50µs/DIV FREQ = 550kHz 7V TO 1V COMPA CONNECTED TO COMPB COMPA CONNECTED TO COMPB 70 0 C C 2 4 6 8 10 12 14 16 18 20 FF = 180pF, CBOT = 22pF, CCOMPA = 180pF FF = 180pF, CBOT = 22pF, CCOMPA = 180pF C C OUTPUT CURRENT (A) OUT = 100µF CER ×2, OUT = 100µF CER ×2, 680µF 2.5V 6mΩ POSCAP ×2 680µF 2.5V 6mΩ POSCAP ×2 4639 G03
2.5V to 1.5V with 7.5A/µs Load 3.3V to 1V with 7.5A/µs Load 3.3V to 1.2V with 7.5A/µs Load Step, CPWR = 5V Step, CPWR = 5V Step, CPWR = 5V
VOUT VOUT VOUT VP-P = VP-P = 80mV VP-P = 80mV 80mV LOAD LOAD LOAD STEP STEP STEP 0A TO 0A TO 7.5A 0A TO 7.5A 7.5A 50µs/DIV 4639 G07 50µs/DIV 4639 G08 50µs/DIV 4639 G09 COMPA CONNECTED TO COMPB COMPA CONNECTED TO COMPB COMPA CONNECTED TO COMPB CFF = 180pF, CBOT = 22pF, CCOMPA = 180pF CFF = 180pF, CBOT = 22pF, CCOMPA = 180pF CFF = 180pF, CBOT = 22pF, CCOMPA = 180pF COUT = 100µF CER ×2, COUT = 100µF CER ×2, COUT = 100µF CER ×2, 680µF 2.5V 6mΩ POSCAP ×2 680µF 2.5V 6mΩ POSCAP ×2 680µF 2.5V 6mΩ POSCAP ×2 4639f For more information www.linear.com/LTM4639 5