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MC13883EP4 Scheda tecnica(PDF) 11 Page - Freescale Semiconductor, Inc |
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MC13883EP4 Scheda tecnica(HTML) 11 Page - Freescale Semiconductor, Inc |
11 / 64 page Power Architecture MC13883 Technical Data, Rev. 3 Freescale Semiconductor 11 4.2.3 Single-Path Charging Figure 5. Single-Path Charging Block Diagram As implied by its name, a single-path charging topology has only one path from the charger to B+. The phone operates from the voltage at the battery terminals during charge, if the battery is significantly discharged, the phone will not turn on until the battery has charged to 3.2 V. There are redundant 1 Ω 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. Table 5. FET Combinations M1 M2 M4 Combination 1 Si8401 Si8401 Si8401 or FDZ291P Combination 2 Si8415 Si8401 Si8401 or FDZ291P Combination 3 FDZ293P FDZ293P Si8401 or FDZ293P B+ 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 |
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