Datasheet LTM4645 (Analog Devices) - 3

LTM4645
e lecTrical characTerisTics The
l
denotes the specifications which apply over the specified internal operating temperature range, otherwise specifications are at TA = 25°C (Note 2). VIN = 12V, per the typical application. SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
VIN Input DC Voltage l 4.7 15 V VOUT(RANGE) Output Voltage Range VIN = 4.7V to 15V l 0.6 1.8 V VOUT(DC) Output Voltage, Total Variation CIN = 22µF × 4, COUT = 100µF Ceramic, 470µF POSCAP, with Line and Load RFB = 60.4k, MODE = GND,VIN = 4.7V to 15V, IOUT = 0A to 25A l 1.186 1.200 1.214 V
Input Specifications
IQ(VIN) Input Supply Bias Current VIN = 12V, VOUT = 1.2V, Burst Mode Operation, IOUT = 0A 11 mA VIN = 12V, VOUT = 1.2V, Pulse-Skipping Mode, IOUT = 0A 25 mA VIN = 12V, VOUT = 1.2V, Switching Continuous, IOUT = 0A 170 mA Shutdown, RUN = 0, VIN = 12V 90 µA IS(VIN) Input Supply Current VIN = 12V, VOUT = 1.2V, IOUT = 25A 3.0 A
Output Specifications
IOUT(DC) Output Continuous Current VIN = 12V, VOUT = 1.2V (Note 4) 0 25 A Range ∆VOUT(LINE)/VOUT Line Regulation Accuracy VOUT = 1.2V, VIN from 4.7V to 15V, IOUT = 0A l 0.005 0.05 %/V ∆VOUT(LOAD)/ VOUT Load Regulation Accuracy VOUT = 1.2V, IOUT = 0A to 25A, VIN = 12V (Note 4) l 0.1 0.3 % VOUT(AC) Output Ripple Voltage COUT = 100µF Ceramic × 6, 15 mV VIN = 12V, VOUT = 1.2V, IOUT = 0A ∆VOUT(START) Turn-On Overshoot COUT = 100µF Ceramic × 6, 20 mV VIN = 12V, VOUT = 1.2V, IOUT = 0A tSTART Turn-On Time COUT = 100µF Ceramic × 6 5 ms VIN = 12V, VOUT = 1.2V, No Load, TRACK/SS = 0.01µF ∆VOUTLS Peak Deviation for Dynamic Load: 0% to 50% to 0% of Full Load, 36 mV Load COUT = 100µF Ceramic × 6, VIN = 12V, VOUT = 1.2V tSETTLE Settling Time for Dynamic Load: 0% to 50% to 0% of Full Load, 15 µs Load Step COUT = 100µF Ceramic × 6, VIN = 12V, VOUT = 1.2V IOUTPK Output Current Limit VIN = 12V, VOUT = 1.2V 35 A
Control Specifications
VFB Voltage at VFB Pin IOUT = 0A, VOUT = 1.2V l 594 600 606 IFB Current at VFB Pin (Note 7) –30 –100 nA ITRACK/SS Track Pin Soft-Start Pull-Up TRACK/SS = 0V 1.25 µA Current tON(MIN) Minimum On-Time (Note 3) 90 ns RFBHI Resistor Between VOUT_LCL 60.05 60.40 60.75 kΩ and VFB Pins VRUN RUN Pin On Threshold VRUN Rising 1.2 1.35 1.45 V VRUNHYS RUN Pin On Hysteresis 180 mV UVLO Undervoltage Lockout VINTVCC Falling 4 V UVLOHYS UVLO Hysteresis 400 mV VHIZB HIZB Pin On Threshold VHIZB Rising 2.3 V VHIZBHYS HIZB Pin On Hysteresis 800 mV 4645f For more information www.linear.com/LTM4645 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 Typical Applications Package Description Package Photo Design Resources Related Parts