Datasheet LTM4657 (Analog Devices) - 5

LTM4657
TYPICAL PERFORMANCE CHARACTERISTICS Start-Up with No Load Current Start-Up with 8A Load Current
RUN RUN 5V/DIV 5V/DIV PGOOD PGOOD 5V/DIV 5V/DIV VOUT VOUT 1V/DIV 1V/DIV IIN IIN 200mA/DIV 500mA/DIV 2ms/DIV 4657 G09 2ms/DIV 4657 G10 VIN = 12V, VOUT = 1V, fSW = 500kHz, VIN = 12V, VOUT = 1V, fSW = 500kHz, COUT = 2× 100µF + 22µF CERAMIC CAP; COUT = 2× 100µF + 22µF CERAMIC CAP; COMPa = COMPb COMPa = COMPb CFF = 100pF, MODE: CCM, IOUT = 0A CFF = 100pF, MODE: CCM, IOUT = 8A
Short-Circuit with No Load Short-Circuit with 8A Load Applied Applied
IIN IIN 1A/DIV 1A/DIV VOUT VOUT 1V/DIV 1V/DIV 100µs/DIV 4657 G11 100µs/DIV 4657 G12 VIN = 12V, VOUT = 1.5V, fSW = 650kHz, VIN = 12V, VOUT = 1.5V, fSW = 650kHz, COUT = 2× 100µF + 22µF CERAMIC CAP; COUT = 2× 100µF + 22µF CERAMIC CAP; COMPa = COMPb COMPa = COMPb CFF = 100pF CFF = 100pF
Steady-State Output Voltage Ripple Start Into Pre-Biased Output
RUN 5V/DIV PGOOD V 5V/DIV OUT 20mV/DIV VOUT AC-COUPLED 2V/DIV IIN 200mA/DIV 1µs/DIV 4657 G13 2ms/DIV 4657 G14 VIN = 12V, VOUT = 1V, fSW = 500kHz, VIN = 12V, VO = 1.2V TO 3.3V, fSW = 1000kHz, COUT = 2× 100µF + 22µF CERAMIC CAP; COUT = 2× 100µF + 22µF CERAMIC CAP; COMPa = COMPb COMPa = COMPb CFF = 100pF, MODE: CCM, IOUT = 8A CFF = 100pF, MODE: CCM, IO = 0A MEASURED ACROSS 22µF CERAMIC CAP Rev 0 For more information www.analog.com 5 Document Outline Features Applications Typical Application Description Absolute Maximum Ratings Order Information Electrical Characteristics Pin Configuration Typical Performance Characteristics Pin Functions Block Diagram Decoupling Requirements Operation Applications Information Package Description Package Photo Design Resources Related Parts