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LTC3124 Datasheet(PDF) 7 Page - Linear Technology |
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LTC3124 Datasheet(HTML) 7 Page - Linear Technology |
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7 / 28 page  LTC3124 7 3124f For more information www.linear.com/LTC3124 TYPICAL PERFORMANCE CHARACTERISTICS Output Voltage Ripple at 1.5A Load with Two 10µF Ceramic Capacitors SWA and SWB at 1MHz/Phase SW Pins while Synchronizing to 1.2MHz Short-Circuit Response PIN FUNCTIONS SWB, SWA (Pin 1, Pin 3): Phase B and Phase A Switch Pins. Connect inductors from these pins to the input sup- ply. Keep PCB trace lengths as short and wide as possible to reduce EMI and voltage overshoot. When VOUT ≥ VIN + 2V, internal anti-ringing resistors are connected between VIN and both SWA and SWB after their respective induc- tor currents have dropped to near zero, to minimize EMI. Theseanti-ringingresistorsarealsoactivatedinshutdown and during the sleep periods of Burst Mode operation. PGNDB, PGNDA, PGND (Pin 2, Pin 4, Exposed Pad Pin 17):PowerGround.WhenlayingoutyourPCB,provide a short, direct path between PGND and the output capaci- tors and tie directly to the ground plane. The exposed pad is ground and must be soldered to the PCB ground plane for rated thermal and electrical performance. VIN (Pin 5): Input Supply Pin. The device is powered from VIN if VIN is initially greater than approximately 3.5V, with VINcontinuingtosupplythedevicedowntoapproximately 3V; otherwise the greater of VIN and VOUT supplies the Configured as front page application at TA = 25°C, unless otherwise specified. VOUT 5V/DIV INDUCTOR B CURRENT 2A/DIV INDUCTOR A CURRENT 2A/DIV 100µs/DIV ILOAD = 500mA 3124 G28 SHORT-CIRCUIT APPLIED SHORT-CIRCUIT REMOVED VSWA 5V/DIV VSWB 5V/DIV 500ns/DIV ILOAD = 1500mA 3124 G29 INDUCTOR B CURRENT 500mA/DIV INDUCTOR A CURRENT 500mA/DIV VOUT 20mV/DIV AC-COUPLED 500ns/DIV 3124 G31 VSWA 5V/DIV VSWB 5V/DIV 500ns/DIV ILOAD = 1500mA 3124 G30 |
Similar Part No. - LTC3124_15 |
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Similar Description - LTC3124_15 |
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