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전자부품 데이터시트 검색엔진 |
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전자부품 데이터시트 검색엔진 |
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MC13883EP4 데이터시트(PDF) 10 Page - Freescale Semiconductor, Inc |
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MC13883EP4 데이터시트(HTML) 10 Page - Freescale Semiconductor, Inc |
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10 / 64 page  Power Architecture MC13883 Technical Data, Rev. 3 10 Freescale Semiconductor The selection of devices appropriate for M1, M2 and M4 should be made carefully because of stability issues. The recommended device for these locations is shown in Table 5. 4.2.2 Serial Path Charging Overview Figure 4. Serial-Path Charging Block Diagram The serial path charging topology has the main charge path to the B+ node and a switch, M3, from the battery to the B+ node. When the battery is above 3.2 V, the charge current will pass to the battery via the B+ node. If the battery is below 3.2 V, FET M3 is opened and the charge path regulator powers the B+ node, so the phone can operate, the on-chip trickle current path simultaneously charges the battery. This way, the phone can turn on even with a deeply discharged battery. There are redundant 1 ohm and 2.2 uF capacitors on the VBUS pin which are required parts for stability reasons. Each of the 2.2 uF capacitors should be X5R or better with a minimum capacitance of 1.3 uF with 5 volts applied. The value of a ceramic capacitor is a function of the voltage applied to it. It should be rated for a high voltage, such as 20 volts to withstand failed chargers. The selection of devices appropriate for M1 and M2 should be made carefully because of stability issues. The recommended device for these locations is shown in Table 5. B+ M3 0.1 Ω Battery CHRGMODE + - OV Comp Batt Voltage Regulator with Current Limit and OV Protection + - VB[2:0] Voltage Error Amp ICHR G [3:0] Chrg In Diff Amp Chrg In Error Amp BP Voltage Regulator and OV Protection VBus (from mini-USB connector) M1 M2 Rs VBUS OV_REF ISENSE CHRGCTRL ICHRG_TR[2:0] + - ICHRG To A/D Convertor Input 4 3 3 Trickle Charge Control OV_ENB + - + - + - OC_ REF + - BP Ref Voltage Error Amp OC Comp Curr Out Diff Amp BATTP BP FET_CTRL BP_FET_BIT BATT_FET_BIT MC13883 One Chip Charging Block From Detection Block BPFET FET Switching Ctrl Logic BATT_FET Turnon Signal to Phone PWR_ON R3a 1 Ohm R3b 1 Ohm 2.2uF 2.2uF VC |
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