ltc1473l Linear Technology Corporation, ltc1473l Datasheet
ltc1473l
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ltc1473l Summary of contents
Page 1
... N-channel MOSFET switches while an internal undervoltage lock-out circuit keeps the system alive down to 2.8V. The LTC1473L senses current to limit inrush between the batteries and the system supply capacitor during switch- over transitions or during fault conditions. A user-pro- grammable timer monitors the time the MOSFET switches are in current limit and latches them off when the pro- grammed time is exceeded ...
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... GS SAB1 SAB2 C = 1000pF (Note 6) GS SAB1 SAB2 C = 1000pF (Note 6) GS SAB1 SAB2 U W ORDER PART NUMBER 16 GA1 15 SAB1 14 GB1 LTC1473LCGN + 13 SENSE – 12 SENSE 11 GA2 GN PART MARKING 10 SAB2 9 GB2 1473L = 150 MIN TYP MAX 2.8 9 – 100 200 7.5 8.5 9 ...
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... Temperature 2.75 2.70 2.65 START-UP THRESHOLD 2.60 2.55 2.50 SHUTDOWN 2.45 THRESHOLD 2.40 2.35 2.30 2.25 – 60 –40 – 100 TEMPERATURE ( C) 1473 G05 LTC1473L + – when BSENSE BSENSE = 0V. Gate rise times are measured from 1V to SENSE DC Supply Current vs V SENSE 400 + 350 DIODE IN1 IN2 + – 300 V – ...
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... LTC1473L W U TYPICAL PERFOR A CE CHARACTERISTICS Turn-Off Delay and Gate Fall Time vs Temperature 2 2 1000pF LOAD SAB 1.8 GATE FALL 1.6 TIME 1.4 1.2 TURN-OFF DELAY 1.0 0.8 0.6 0.4 –60 –40 – 100 0 TEMPERATURE ( C) 1473 G07 Logic Input Threshold Voltage vs Temperature 2.0 1.8 1.6 1 10V 1 2.8V 0.6 0.4 0.2 0 – 60 –40 – ...
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... MIN 0 – 0.3 0 – 0.3 0 – 0.3 1.16 – 0.3 2.8 9 – 0.3 10.2 20 – 0 – 0 – 0 – 0 – 0 – 0 – 0 – 0 – 0 – 0.3 LTC1473L switching GG ABSOLUTE MAX (V) MAX ...
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... LTC1473L CTIO S GB1, GA1 (Pins 14, 16): Switch Gate Drivers. GA1 and GB1 drive the gates of the first back-to-back external N-channel switches CTIO AL DIAGRA IN1 1 IN2 2 DIODE TIMER 4 TO GATE DRIVERS + GND 8 6 SAB1 (Pin 15): Source Return. The SAB1 pin is connected to the sources and SW B1 ...
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... U OPERATIO The LTC1473L is responsible for low-loss switching and isolation for a dual supply system, where during a power backup situation, a battery pack can be connected or disconnected seamlessly. Smooth switching between in- put power sources is accomplished with the help of low-loss N-channel switches. They are driven by special ...
Page 8
... Using Tantalum Capacitors The inrush (and “outrush”) current of the load capacitor is limited by the LTC1473L, i.e., the current flowing both in and out of the capacitor during transitions from one input power source to another is limited. In many applications, ...
Page 9
... The supply to V comes from the main power SW A1 BAT1 ON DCIN Figure 4. LTC1473L PowerPath Switches in 2-Diode Mode W U sources, DCIN and BAT1 through two common cathode Schottky diodes as shown in Figure 1.) The 2-diode mode is asserted by applying an active low to the DIODE input. COMPONENT SELECTION ...
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... LTC1473L U U APPLICATIO S I FOR ATIO power dissipated in the switches is never allowed to rise above the manufacturers’ recommended level. Inrush Current Sense Resistor, R SENSE A small valued sense resistor (current shunt) is used by the two switch pair drivers to measure and limit the inrush or short-circuit current flowing through the conducting switch pair ...
Page 11
... C1 and C2 can be ceramic capacitors. DCIN LTC1473L + V + (8. GATE DRIVERS SWITCHING REGULATOR GND *COILCRAFT 1812LS-105 XKBC. (708) 639-6400 Figure 5. V Step-Up Switching Regulator GG LTC1473L output and should be at least 1 F and rated GG BAT1 L1* 1mH 25V 25V 1473 F05 regu ...
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... GND 47.55k 12.45k 1k * L1A, L1B ARE TWO 33 H WINDINGS ON A SINGLE INDUCTOR: COILTRONICS CTX33-3 ** TOKIN CERAMIC 1E22ZY5U-C203-F 12 LTC1473L with Battery Charger DCIN 3.3V D1 100mA BAT54C 1 IN1 C1 2 LOGIC IN2 22 F DRIVEN 25V 3 DIODE 4 TIMER TIMER ...
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... R21 164k 0.1% LTC1473L 30V OS-CON L1* R SENSE 10 H 0.015 C + OUT M2 R1 100 F D2 105k 10V MBRS140T3 1% 3 SGND Si9926DY LTC1473L 16 1 IN1 GA1 15 2 IN2 SAB1 DIODE GB1 SENSE 0.033 TIMER SENSE – V SENSE GA2 ...
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... IN2 SAB1 DRIVEN 3 14 DIODE GB1 TIMER SENSE – V SENSE GA2 GG 1mH SAB2 8 9 GND GB2 Si4966DY LTC1473L 16 GA1 15 SAB1 14 R GB1 SENSE 0. SENSE 12 + – SENSE 11 GA2 10 SAB2 9 GB2 1473 TA05 Si4966DY Si4966DY R SENSE 0.015 3. OUT ...
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... TYP 0.016 – 0.050 0.008 – 0.012 (0.406 – 1.270) (0.203 – 0.305) Hot Swap is a trademark of Linear Technology Corporation LTC1473L DOCKING CONNECTOR 5V LONG PIN Q1 Si9926DY 16 GA1 15 SAB1 14 R3 GB1 0 ...
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... High Efficiency, Minimal External Components to Fast Charge Lithium, NiMH and NiCd Batteries Power Supply Backup Using a Single NiCd Cell 550kHz Operation, 100% Duty Cycle, V 2-Phase Switching, 5V Standby in Shutdown, Fault Protection Charges Lithium, NiCd and NiMH Batteries, 28-Lead SSOP Q1 Si9926DY LTC1473L 1 16 IN1 GA1 2 15 SAB1 ...