Datasheet LTM4639 (Analog Devices) - 3

LTM4639
ELECTRICAL CHARACTERISTICS The
l
denotes the specifications which apply over the specified internal operating temperature range (Note 2), otherwise specifications are at TA = 25°C. VIN = 3.3V, CPWR = 5V, per the typical application in Figure 22. SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS Input Specifications
VRUN RUN Pin On Threshold VRUN Rising 1.1 1.25 1.4 V VRUNHYS RUN Pin On Hysteresis 130 mV IQ(VIN) Input Supply Bias Current VIN = 7V, VOUT = 1.5V, Burst Mode Operation, IOUT = 0.1A 25 mA VIN = 7V, VOUT = 1.5V, Pulse-Skipping Mode, IOUT = 0.1A 35 mA VIN = 7V, VOUT = 1.5V, Switching Continuous, IOUT = 0.1A 68 mA Shutdown, RUN = 0, VIN = CPWR = 7V 45 µA IS(VIN) Input Supply Current VIN = 3.3V, VOUT = 1.5V, IOUT = 20A, CPWR = 5V 10.35 A VIN = 7V, VOUT = 1.5V, IOUT = 20A, CPWR = 5V 4.93 A IPWR(IN) Control Power Current 3.3VIN to 1.5VOUT at 0A Load, CPWR = 5V 28 mA
Output Specifications
IOUT(DC) Output Continuous Current VIN = 3.3V, VOUT = 1.5V (Note 4) 0 20 A Range ∆VOUT (Line) Line Regulation Accuracy VOUT = 1.5V, VIN from 2.375V to 7V, CPWR = 5V, l 0.02 0.04 %/V VOUT IOUT = 0A ∆VOUT (Load) Load Regulation Accuracy VOUT = 1.5V, IOUT = 0A to 20A, VIN = 3.3V, CPWR = 5V l 0.1 0.3 % VOUT (Note 4) VOUT(AC) Output Ripple Voltage IOUT = 0A, COUT = 100µF Ceramic, 470µF POSCAP 20 mVP-P VIN = 3.3V, VOUT = 1.5V, CPWR = 5V ∆VOUT(START) Turn-On Overshoot COUT = 100µF Ceramic, 470µF POSCAP, 15 mV VOUT = 1.5V, IOUT = 0A, VIN = 3.3V, CPWR = 5V tSTART Turn-On Time COUT = 100µF Ceramic, 470µF POSCAP, 0.6 ms No Load, TRACK/SS = 0.001µF, VIN = 3.3V, CPWR = 5V ∆VOUTLS Peak Deviation for Load: 5A to 12.5A Load Step, 1µs Rise Time 30 mV Dynamic Load COUT = 100µF × 2 Ceramic, COUT × 2 POSCAP, VIN = 3.3V, VOUT = 1.5V, CPWR = 5V tSETTLE Settling Time for Dynamic Load: 5A to 12.5A Load Step, 3.3V, VIN = 5V, VOUT = 1.5V 30 µs Load Step COUT = 100µF × 2 Ceramic, 680µF POSCAP IOUTPK Output Current Limit VIN = 3.3V, VOUT = 1.5V 30 A VIN = 7V, VOUT = 1.5V 30 A
Control Section
VFB Voltage at VFB Pin IOUT = 0A, VOUT = 1.5V l 0.594 0.60 0.606 V IFB Current at VFB Pin (Note 7) –12 –25 nA VOVL Feedback Overvoltage l 0.65 0.67 0.69 V Lockout ITRACK/SS Track Pin Soft-Start Pull- TRACK/SS = 0V 1.0 1.2 1.4 µA Up Current tON(MIN) Minimum On-Time (Note 3) 100 ns RFBHI Resistor Between VOUT_LCL 60.05 60.40 60.75 kΩ and VFB Pins
Remote Sense Amplifier
V + OSNS , Common Mode Input VIN = 3.3V, Run > 1.4V, CPWR = 5V 0 3.6 V VOSNS– CM RANGE Range VDIFF_OUT(MAX) Maximum DIFF_OUT IDIFF_OUT = 300µA INTVCC – 1.4 V Voltage V + OS Input Offset Voltage VOSNS = VDIFF_OUT = 1.5V, IDIFF_OUT = 100µA 2.5 mV 4639f For more information www.linear.com/LTM4639 3