LTC4357 LINER [Linear Technology], LTC4357 Datasheet
LTC4357
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LTC4357 Summary of contents
Page 1
... Schottky diode. When used in diode-OR and high current diode applications, the LTC4357 reduces power consump- tion, heat dissipation, voltage loss and PC board area. The LTC4357 easily ORs power sources to increase total system reliability. In diode-OR applications, the LTC4357 controls the forward voltage drop across the MOSFET to ensure smooth current transfer from one path to the other without oscillation ...
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... LTC4357 ABSOLUTE MAXIMUM RATINGS Supply Voltages IN, OUT, V ........................................ –0.3V to 100V DD Output Voltage GATE (Note 3) ........................ V Operating Ambient Temperature Range LTC4357C ................................................ 0°C to 70°C LTC4357I.............................................. –40°C to 85°C PIN CONFIGURATION TOP VIEW OUT GATE 3 DCB PACKAGE 6-LEAD (2mm × 3mm) PLASTIC DFN = 125° ...
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... Note 2: All currents into pins are positive, all voltages are referenced to GND unless otherwise specifi ed. Note 3: An internal clamp limits the GATE pin to a minimum of 10V above IN or 100V above GND. Driving this pin to voltages beyond this clamp may damage the device. LTC4357 MIN TYP MAX UNITS l – ...
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... LTC4357 TYPICAL PERFORMANCE CHARACTERISTICS V Current ( 800 OUT 600 400 200 (V) DD 4357 G01 GATE Current vs Forward Drop vs Δ GATE(UP 2.5V GATE 0 –25 –50 – 100 V (mV) SD 4357 G04 FET Turn-Off Time vs Initial ...
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... It connects to the drain of the N-channel MOSFET. The voltage sensed at this pin is used to control the source-drain voltage across the MOSFET Positive Supply Input. The LTC4357 is powered from DD the V pin. Connect this pin to OUT either directly or DD through an RC hold-up circuit ...
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... MOSFET gate is driven lower by a weak pull-down in an attempt to maintain the drop at 25mV. If the load current reverses and the voltage across IN to OUT is more negative than –25mV the LTC4357 responds by pulling the MOSFET gate low with a strong pull-down. ...
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... ORing MOSFET conducts. Meanwhile, the LTC4357 charges its MOSFET gate with 20μA until the forward drop is reduced to 25mV. If instead this supply was delivering load current at the time of the fault, its associ- ...
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... LTC4357 APPLICATIONS INFORMATION V Hold-Up Circuit DD In the event of an input short, parasitic inductance between the input supply of the LTC4357 and the load bypass capacitor may cause V to glitch below its minimum DD operating voltage. This causes the turn-off time (t increase. To preserve the fast turn-off time, local output bypassing of 39μ ...
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... OUT OUT GATE Figure 4. Layout Considerations Solar Panel Charging a Battery FDB3632 100Ω IN GATE OUT V LTC4357 DD 0.1μF GND LTC4357 OUT OUT 4357 F04 + 12V LOAD BATTERY 4357 TA02 ...
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... TYPICAL APPLICATIONS MMBD1205 MMBD1205 10 –12V Reverse Input Protection Si4874DY V IN2 12V IN GATE OUT LTC4357 V DD GND –48V Reverse Input Protection FDB3672 V IN2 48V IN GATE OUT LTC4357 V DD GND V OUT 12V 10A C LOAD 4357 F03 V OUT 48V 10A C LOAD SMAT70A 4357 F05 4357fb ...
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... NOTE 6) 0.200 REF 0.75 0.05 MS8 Package 8-Lead Plastic MSOP (Reference LTC DWG # 05-08-1660 Rev F) DETAIL “A” 0.254 (.010) 0 – 6 TYP GAUGE PLANE 0.53 0.152 (.021 .006) DETAIL “A” 0.18 (.007) SEATING LTC4357 R = 0.115 0.40 0.10 TYP TYP 3.00 0.10 1.65 0.10 (2 SIDES) (2 SIDES) PIN 1 NOTCH R0.20 OR 0.25 45 CHAMFER 3 1 ...
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... GATE OUT LTC4357 V DD GND FDB3632 IN GATE OUT LTC4357 V DD GND PLUG-IN CARD CONNECTOR 2 COMMENTS Negative High Voltage Supplies From –10V to –80V Active Current Limiting, Supplies From 9V to 80V UV/OV Monitor, –10V to –80V Operation, MSOP Package Active Current Limiting, Supplies From –20V to –80V Fast Active Current Limiting, Supplies From – ...