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LTC4215 Datasheet(PDF) 10 Page - Linear Technology |
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LTC4215 Datasheet(HTML) 10 Page - Linear Technology |
10 / 24 page LTC4223-1/LTC4223-2 10 422312f The typical LTC4223 application is in a Carrier board for Advanced Mezzanine Cards (AMC), delivering 3.3V auxiliary and 12V power to the AMC module. A control- ler on the Carrier board sequences the turn-on of power supplies and manages the fault and power-good reports from the LTC4223. The LTC4223 detects board presence during insertion and extraction, allowing power to be delivered in a controlled manner without damaging the connector. The typical LTC4223 application circuit is shown in Figure 1. External component selection is discussed in detail in the Design Example section. APPLICATIONS INFORMATION Turn-On Sequence The power supplies delivered to an AMC module are controlled by the external N-channel pass transistor, Q1 in the 12V power path and an internal pass transistor in the 3.3V auxiliary power path. Sense resistor RS monitors the 12V load current for fault detection and current sensing information. GATE capacitor CG provides gate slew rate control to limit the inrush current. Resistor RG with CG compensates the current control loop while R3 prevents parasitic oscillations in Q1. 422312 F01 12VOUT 12VSENSE 12VGATE 12VIN VCC AUXIN AUXOUT EN AUXON 12ON AUXPGOOD 12PGOOD FAULT 12V 5 21 16 15 12 10 89 6 7 4 11 13 3 58 2 3 4 7 6 1 14 3.3V RS 6m Ω Q1 Si7336ADP PWR MP PS1 PS0 CARRIER AMC CONNECTOR MODULE AMC CONNECTOR TIMER LTC4223-1 GND 12V 7.4A 3.3V 150mA R3 10 Ω R2 51 Ω MP ENABLE PWR ENABLE MP GOOD PWR GOOD FAULT C2 330nF BULK SUPPLY BYPASS CAPACITOR CT 0.1 μF 1 μF RG 47 Ω CG 15nF 3.3V 3.3V INTELLIGENT PLATFORM MANAGEMENT CONTROLLER ENABLE PRESENCE RESET 12IMON R4* 10k 2.2k *OPTIONAL 3.3V 10k R5* 10k R6* 10k 3.3V 3.3V 3.3V BULK SUPPLY BYPASS CAPACITOR LTC1197L VREF CLK DOUT CS +IN –IN VCC GND 3 Figure 1. Advanced Mezzanine Card/MicroTCA Application |
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