Datasheet LTM4650A (Analog Devices) - 3

LTM4650A
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
VIN Input DC Voltage l 4.5 16 V VOUT Output Voltage l 0.6 5.5 V VOUT1(DC), Output Voltage, Total DC Variation CIN = 22µF × 3, COUT = 100µF × 1 Ceramic, l 1.188 1.2 1.212 V VOUT2(DC) with Line and Load (Note 8) 470µF POSCAP VIN = 4.5V to 16V, VOUT = 1.2V, IOUT = 0A to 25A
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 7) 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 (Note 7) 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 SYNC Capture Range 250 780 kHz (Each Channel) 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) Output Current Limit VIN = 12V, VOUT = 1.2V 30 A (Each Channel)
Control Section
VFB1, VFB2 Voltage at VFB Pins IOUT = 0A, VOUT = 1.2V l 0.595 0.600 0.605 V IFB (Note 6) –5 –20 nA VOVL Feedback Overvoltage Lockout l 0.64 0.66 0.68 V 4650afb For more information www.linear.com/LTM4650A 3