Datasheet LTM4650A-1 (Analog Devices) - 3

LTM4650A-1
ELECTRICAL CHARACTERISTICS The
l
denotes the specifications which apply over the specified internal operating temperature range. Specified as each individual output channel. TA = 25°C (Note 2), VIN = 12V and VRUN1, VRUN2 at 5V unless otherwise noted. Per the typical application in Figure 34. SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS Input Specifications
VRUN1, VRUN2 RUN Pin On/Off Threshold RUN Rising 1.1 1.25 1.40 V VRUN1HYS, VRUN2HYS RUN Pin On Hysteresis 150 mV IINRUSH(VIN) Input Inrush Current at Start-Up IOUT = 0A, CIN = 22µF ×3, CSS = 0.01µF, 1 A COUT = 100µF ×3, VOUT1 = 1.2V, VOUT2 = 1.2V, VIN = 12V IQ(VIN) Input Supply Bias Current VIN = 12V, VOUT = 1.2V, Burst Mode Operation 4.5 mA (Both Channels On) VIN = 12V, VOUT = 1.2V, Pulse-Skipping Mode 19 mA VIN = 12V, VOUT= 1.2V, Switching Continuous 115 mA Shutdown, RUN = 0, VIN = 12V 35 µA IS(VIN) Input Supply Current VIN = 5V, VOUT = 1.2V, IOUT = 25A 8.2 A VIN = 12V, VOUT = 1.2V, IOUT = 25A 3.1 A
Output Specifications
IOUT1(DC), IOUT2(DC) Output Continuous Current Range VIN = 12V, VOUT = 1.2V (Note 6) 0 25 A ΔVOUT1(LINE)/VOUT1 Line Regulation Accuracy For Each Output, VOUT = 1.2V, IOUT = 0A, l 0.02 0.1 %/V ΔVOUT2(LINE)/VOUT2 VIN from 4.5V to 16V ΔVOUT1/VOUT1 Load Regulation Accuracy For Each Output, VIN = 12V, VOUT = 1.2V, l 0.1 0.4 % ΔVOUT2/VOUT2 IOUT from 0A to 25A VOUT1(AC), VOUT2(AC) Output Ripple Voltage For Each Output, VIN = 12V, VOUT = 1.2V, 15 mVP-P Frequency = 450kHz, IOUT = 0A, COUT = 100µF ×3 Ceramic, 470µF POSCAP fS (Each Channel) Output Ripple Voltage Frequency VIN = 12V, VOUT = 1.2V, fSET = 1.25V (Note 4) 500 kHz fSYNC (Each Channel) SYNC Capture Range 250 780 kHz ΔVOUTSTART Turn-On Overshoot COUT = 100µF ×3 Ceramic, 470µF POSCAP, 10 mV (Each Channel) VIN = 12V , VOUT = 1.2V, IOUT = 0A tSTART Turn-On Time COUT = 100µF ×3 Ceramic, 470µF POSCAP, 5 ms (Each Channel) VIN = 12V, No Load, TRACK/SS with 0.01µF to GND ΔVOUT(LS) Peak Deviation for Dynamic Load Load: 0% to 50% to 0% of Full Load 30 mV (Each Channel) COUT = 100µF ×3 Ceramic, 470µF POSCAP, VIN = 12V, VOUT = 1.2V tSETTLE Settling Time for Dynamic Load Load: 0% to 50% to 0% of Full Load, 20 µs (Each Channel) Step VIN = 12V, COUT = 100µF ×3 Ceramic, 470µF POSCAP IOUT(PK) (Each Channel) Output Current Limit VIN = 12V, VOUT = 1.2V 30 A
Control Section
VFB1, VFB2 Voltage at VFB Pins IOUT = 0A, VOUT = 1.2V l 0.595 0.600 0.605 V IFB (Note 5) –5 –20 nA VOVL Feedback Overvoltage Lockout l 0.64 0.66 0.68 V ITRACK1, ITRACK2 Track Pin Soft-Start Pull-Up Current TRACK1,TRACK2 Start at 0V 1 1.25 1.5 µA UVLO Undervoltage Lockout (Falling) 3.3 V UVLO Hysteresis 0.6 V tON(MIN) Minimum On-Time (Note 5) 90 ns RFBHI1, RFBHI2 Resistor Between VOUTS1, VOUTS2 60.05 60.4 60.75 kΩ and VFB1, VFB2 Pins for Each Output VPGOOD1, VPGOOD2 Low PGOOD Voltage Low IPGOOD = 2mA 0.1 0.3 V 4650a1f For more information www.linear.com/LTM4650A-1 3 Document Outline Features Applications Typical Application Description Absolute Maximum Ratings Order Information Electrical Characteristics Pin Configuration Typical Performance Characteristics Pin Functions Simplified Block Diagram Decoupling Requirements Operation Applications Information Typical Applications Package Description Typical Application Package Photo Design Resources Related Parts