LTC4352 LINER [Linear Technology], LTC4352 Datasheet
LTC4352
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LTC4352 Summary of contents
Page 1
... The ideal diode function permits low loss power ORing and supply holdup applications. The LTC4352 regulates the forward voltage drop across the MOSFET to ensure smooth current transfer in diode-OR applications. A fast turn-on reduces the load voltage droop during supply switch-over ...
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... For more information on tape and reel specifi cations, go to: 2 FAULT, STATUS Currents..........................................5mA Operating Ambient Temperature Range LTC4352C ................................................ 0°C to 70°C LTC4352I.............................................. –40°C to 85°C Storage Temperature Range ................... –65°C to 150°C Lead Temperature (Soldering, 10 sec) MS Package ...................................................... 300°C ...
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... FAULT Pulls Low – OUT Note 3: Internal clamps limit the GATE and CPO pins to a minimum of 5V above, and a diode below SOURCE. Driving these pins to voltages beyond the clamp may damage the device. LTC4352 , Open, unless otherwise noted. IN OUT IN ...
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... LTC4352 TYPICAL PERFORMANCE CHARACTERISTICS V Open, unless otherwise noted Current vs Voltage IN 1.6 1.2 0.8 0 (V) IN 4352 G01 OUT Current vs Voltage 300 250 200 150 100 50 0 – (V) OUT 4352 G04 STATUS, FAULT Output Low Voltage vs Current 1 0 ...
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... SOURCE (Pin 12): MOSFET Gate Drive Return. Connect this pin to the source of the external N-channel MOSFET switch. EXPOSED PAD (Pin 13, DD Package Only): Exposed Pad may be left open or connected to device ground may be pulled CC LTC4352 using an external pull-up. Tie to GND or leave ) of the ISS 4352f 5 ...
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... LTC4352 FUNCTIONAL DIAGRAM CP4 – – + 2.57V CP3 – FAULT + CP2 0.5V – OV FAULT + OV 4 CP1 *DD PACKAGE ONLY CHARGE V PUMP CC + 4.1V LDO – GATE OFF ENABLE REVERSE 25mV CURRENT DISABLE + LDO V LOW CC – CP5 0.7V GATE SOURCE OPEN MOSFET ...
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... OPERATION The LTC4352 controls either single or back-to-back N-channel MOSFETs in order to emulate an ideal diode. Dual MOSFETs eliminate current fl ow from the input to the output in an input undervoltage or overvoltage condition. When enabled, an amplifi er (AMP) monitors the voltage between the V and OUT pins, and drives the GATE pin. ...
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... MOSFET, thereby matching the function and performance of an ideal diode. Power Supply Confi guration The LTC4352 can operate with supplies down to 0V. This requires powering the V external supply in the 2. range. If not always present, a series 470Ω resistor or Schottky diode limits ...
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... CPO voltage to 6.7V above SOURCE, while the fi nal GATE voltage is determined by the forward drop servo amplifi er. MOSFET Selection The LTC4352 drives N-channel MOSFETs to conduct the load current. The important features of the MOSFET are its threshold voltage, the maximum drain-source voltage BV ...
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... Figure 5. 5V Ideal Diode with UV and OV Protection 10 Inrush Control The LTC4352 can be used for inrush control in applications where the input supply is hot-plugged. See Figure 6. The CPO capacitor is omitted, since fast turn-on with stored charge is not desired here. Undervoltage holds the gate off till the short pin makes contact. 40μ ...
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... C2. Q1 Si7336ADP TO LOAD 5V V GATE OUT IN 12V SOURCE LTC4352 0.1μF CPO GND 4352 F07 LTC4352 of the MOSFET to achieve the DS(ON) V 50mV FWD = 5mΩ 10A LOAD of 4mΩ and BV DS(ON) 2 • (10A) • 4mΩ = 0.4W DS(ON the Si7336ADP is about ISS ...
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... See Figure also important to put C1, the bypass capacitor for the V pin, as close as possible between V CC Also place C2 near the CPO and SOURCE pins. Surge suppressors, when used, should be mounted close to the LTC4352 using short lead lengths. CURRENT FLOW Q1 SO ...
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... TYPICAL APPLICATIONS 12V GND BACKPLANE Plug-in Card Supply Holdup Using Ideal Diode at Input Q1 Si7336ADP HOT SWAP CONTROLLER SOURCE V GATE OUT IN LTC4352 GND CONNECTORS PLUG-IN CARD LTC4352 TO LOAD + C HOLDUP GND 4352 TA02 13 4352f ...
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... LTC4352 PACKAGE DESCRIPTION 0.70 ±0.05 2.38 ±0.05 3.50 ±0.05 2.10 ±0.05 1.65 ±0.05 PACKAGE OUTLINE 0.25 ± 0.05 0.45 BSC 2.25 REF RECOMMENDED SOLDER PAD PITCH AND DIMENSIONS APPLY SOLDER MASK TO AREAS THAT ARE NOT SOLDERED 14 DD Package 12-Lead Plastic DFN (3mm × 3mm) (Reference LTC DWG # 05-08-1725 Rev A) 3.00 ±0.10 ...
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... MOLD FLASH, PROTRUSIONS OR GATE BURRS SHALL NOT EXCEED 0.152mm (.006") PER SIDE 4. DIMENSION DOES NOT INCLUDE INTERLEAD FLASH OR PROTRUSIONS. INTERLEAD FLASH OR PROTRUSIONS SHALL NOT EXCEED 0.152mm (.006") PER SIDE 5. LEAD COPLANARITY (BOTTOM OF LEADS AFTER FORMING) SHALL BE 0.102mm (.004") MAX LTC4352 4.039 ± 0.102 (.159 ± .004) (NOTE 3) 0.406 ± ...
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... CPO SOURCE V GATE OUT IN STATUS LTC4352 FAULT OV REV GND 4352 TA03 COMMENTS N-Channel, 4.75V to 30V/3.3V to 10V, SSOP-16 Three N-Channel Drivers 28V, SSOP-36 N-Channel, 1.5V to 12V, Share Bus, SSOP-16 N-Channel, 1.2V to 18V, UV, OV, MSOP-10 Dual N-Channel, –4.5V to –80V, SO-8, DFN-8 Dual N-Channel 80V, SO-16, DFN-14 N-Channel 80V, MSOP-8, DFN-6 Internal N-Ch ...