Datasheet LTM4612 (Analog Devices) - 3

LTM4612
ELECTRICAL CHARACTERISTICS The
l
denotes the specifications which apply over the specified internal operating temperature range, otherwise specifications are at TA = 25°C, VIN = 24V, unless otherwise noted (Note 2). Per Typical Application (front page) configuration. SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
IQ(VIN) Input Supply Bias Current VIN = 36V, VOUT = 12V, Switching Continuous 57 mA VIN = 24V, VOUT = 12V, Switching Continuous 48 mA Shutdown, RUN = 0, VIN = 36V 50 µA IS(VIN) Input Supply Current VIN = 36V, VOUT = 12V, IOUT = 5A 1.85 A VIN = 24V, VOUT = 12V, IOUT = 5A 2.72 A VINTVCC Internal VCC Voltage VIN = 36V, RUN > 2V, IOUT = 0A 4.7 5 5.5 V
Output Specifications
IOUT(DC) Output Continuous Current Range VIN = 24V, VOUT = 12V (Note 4) 0 5 A DVOUT(LINE) Line Regulation Accuracy VOUT = 12V, FCB = 0V, VIN = 22V to 36V, V I 0.05 0.3 % OUT OUT = 0A l DVOUT(LOAD) Load Regulation Accuracy VOUT = 12V, FCB = 0V, IOUT = 0A to 5A (Note 4) V V 0.3 0.6 % OUT IN = 36V l VIN = 24V l 0.3 0.6 % VIN(AC) Input Ripple Voltage IOUT = 0A, CIN = 2 × 10µF X5R Ceramic and 1 × 100µF Electrolytic, 1 × 10µF X5R Ceramic on VD Pins VIN = 24V, VOUT = 5V 7.2 mVP-P VIN = 24V, VOUT = 12V 3.4 mVP-P VOUT(AC) Output Ripple Voltage IOUT = 0A, COUT = 2 × 22µF, 2 × 47µF X5R Ceramic VIN = 24V, VOUT = 5V 17.5 mVP-P VIN = 24V, VOUT = 12V 12.5 mVP-P fS Output Ripple Voltage Frequency IOUT = 1A, VIN = 24V, VOUT = 12V 940 kHz DVOUT(START) Turn-On Overshoot, COUT = 200µF, VOUT = 12V, IOUT = 0A TRACK/SS = 10nF VIN = 36V 20 mV VIN = 24V 20 mV tSTART Turn-On Time, TRACK/SS = Open COUT = 300µF, VOUT = 12V, IOUT = 1A Resistive Load VIN = 36V 0.5 ms VIN = 24V 0.5 ms DVOUT(LS) Peak Deviation for Dynamic Load Load: 0% to 50% to 0% of Full Load COUT = 2 × 22µF Ceramic, 150µF Bulk 153 mV VIN = 24V, VOUT = 12V tSETTLE Settling Time for Dynamic Load Step Load: 0% to 50% to 0% of Full Load, VIN = 24V 37 µs IOUT(PK) Output Current Limit COUT = 200µF VIN = 36V, VOUT = 12V 9 A VIN = 24V, VOUT = 12V 9 A
Control Section
VFB Voltage at VFB Pin IOUT = 0A, VOUT = 12V l 0.591 0.6 0.609 V VRUN RUN Pin On/Off Threshold 1 1.5 1.9 V ISS/TRACK Soft-Start Charging Current VSS/TRACK = 0V –1 –1.5 –2 µA VFCB Forced Continuous Threshold 0.57 0.6 0.63 V IFCB Forced Continuous Pin Current VFCB = 0V –1 –2 µA tON(MIN) Minimum On-Time (Note 3) 50 100 ns tOFF(MIN) Minimum Off-Time (Note 3) 250 400 ns RPLLIN PLLIN Input Resistor 50 kW 4612fc For more information www.linear.com/LTM4612 3 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 Package Description Revision History Package Photograph Related Parts