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SI3401-X-GM Datasheet(PDF) 7 Page - Silicon Laboratories |
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SI3401-X-GM Datasheet(HTML) 7 Page - Silicon Laboratories |
7 / 20 page Si3400/Si3401 Rev. 0.9 7 VDD accuracy @ 0.8 mA 36 V < VPORT < 57 V 4.5 — 5.5 V Softstart charging current — 12 — µA Thermal Shutdown Junction temperature — 160 — ºC Thermal Shutdown Hysteresis — — 25 ºC Table 5. Total Power Dissipation Description Condition Min Typ Max Units Power Dissipation VPORT = 50 V, VOUT =5V, 2A — 1.2 — W Power Dissipation* VPORT = 50 V, VOUT = 5 V, 2 A w/ diode bridges bypassed —0.7 — W *Note: Silicon Laboratories recommends the on-chip diode bridges be bypassed when output power requirements are >10 W (Si3401) or in thermally-constrained applications. For more information, see “AN313: Using the Si3400 and Si3401 in High Power Applications”. Table 6. Package Thermal Characteristics Parameter Symbol Test Condition Typ Units Thermal resistance (junction to ambient) θJA Still air; assumes a minimum of nine thermal vias are connected to a 2 in2 heat spreader plane for the package “pad” node (VNEG). 44 °C/W Table 4. Electrical Characteristics (Continued) Parameter Description Min Typ Max Unit Notes: 1. Transient surge defined in IEC60060 as a 1000 V impulse of either polarity applied to CT1–CT2 or SP1–SP2. The shape of the impulse shall have a 300 ns full rise time and a 50 µs half fall time with 201 Ω source impedance. 2. The classification currents are guaranteed only when recommended RCLASS resistors are used, as specified in Table 10. 3. IPORT includes full operating current of switching regulator controller. 4. The PD interface includes dual-level input current limit. At turn-on, before the HSO load capacitor is charged, the current limit is set at the inrush level. After the capacitor has been charged within ~1.25 V of VNEG, the operating current limit is engaged. This higher current limit remains active until the UVLO lower limit has been tripped or until the hotswap switch is sufficiently current-limited to cause a foldback of the HSO voltage. 5. See “AN296: Using the Si3400/01 PoE PD Controller in Isolated and Non-Isolated Designs” for more information. 6. Applies to non-isolated applications only (VOUT on schematic in Figure 1). |
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