Datasheet LTC3618 (Analog Devices) - 5

LTC3618
Typical perForMance characTerisTics TA = 25°C, VIN = 3.3V, f = 1MHz, Figure 3 Circuit, unless otherwise noted. Efficiency vs Input Voltage Efficiency vs Load Current Efficiency vs Load Current VDDQ = 1.8V
100 100 100 VMODE/SYNC = SVIN VMODE/SYNC = SVIN 90 90 90 80 80 80 70 70 70 60 60 60 50 50 50 VMODE/SYNC = SVIN 40 40 40 EFFICIENCY (%) EFFICIENCY (%) EFFICIENCY (%) 30 30 30 ILOAD = 200mA I 20 20 LOAD = 300mA VOUT = 2.5V V 20 TT = 0.75V ILOAD = 1A 10 VOUT = 1.8V 10 VTT = 0.9V 10 ILOAD = 2A VOUT = 1.5V VTT = 1.25V ILOAD = 3A 0 0 0 0.01 0.1 1 10 0.01 0.1 1 10 2.25 2.75 3.25 3.75 4.25 4.75 5.25 LOAD CURRENT (A) LOAD CURRENT (A) INPUT VOLTAGE (V) 3618 G01 3618 G02 3618 G03
Efficiency vs Input Voltage VTT = 0.9V VOUT Load Regulation Input Voltage Line Regulation
100 1.0 0.5 90 0.8 0.4 80 0.6 0.3 70 0.4 0.2 V VTT = 0.9V TT = 0.9V 60 0.2 0.1 (%) (%) 50 V 0 DDQ = 1.8V 0 VDDQ = 1.8V OUT OUT 40 ∆V –0.2 ∆V –0.1 EFFICIENCY (%) 30 ILOAD = 200mA –0.4 –0.2 I 20 LOAD = 300mA I –0.6 LOAD = 1A –0.3 10 ILOAD = 2A –0.4 I –0.8 LOAD = 3A 0 –1.0 –0.5 2.25 2.75 3.25 3.75 4.25 4.75 5.25 –3 –2 –1 0 1 2 3 2.25 2.75 3.25 3.75 4.25 4.75 5.25 INPUT VOLTAGE (V) LOAD CURRENT (A) INPUT VOLTAGE (V) 3618 G04 3618 G05 3618 G06
Forced Continuous Mode Load Step Transient with Operation (FCM) Pulse-Skipping Mode FCM Internal Compensation
VDDQ 200mV/DIV SW1 SW1 IL L1 L1 2A/DIV 1A/DIV 1A/DIV SW2 SW2 ILOAD L2 L2 2A/DIV 1A/DIV 1A/DIV 3618 G07 V 3618 G08 3618 G09 DDQ = 1.8V 400ns/DIV VDDQ = 1.8V 400ns/DIV VIN = 5V 10µs/DIV VTT = 0.9V VTT = 0.9V VDDQ = 1.8V NO LOAD NO LOAD ILOAD = 0A TO 3A VTT IS ALWAYS IN FORCED CONTINUOUS MODE 3618fc For more information www.linear.com/LTC3618 5 Document Outline Features Applications Description Typical Application Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Typical Performance Characteristics Pin Functions Functional Block Diagram Operation Applications Information Typical Applications Package Description Revision History Typical Application Related Parts