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MC13883 Datasheet(PDF) 9 Page - Freescale Semiconductor, Inc |
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MC13883 Datasheet(HTML) 9 Page - Freescale Semiconductor, Inc |
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9 / 64 page  Power Architecture MC13883 Technical Data, Rev. 3 Freescale Semiconductor 9 4.2.1 Dual-Path Charging Overview Figure 3. Dual-Path Charging Block Diagram The basic feature of dual-path charging that sets it apart from single-path charging topologies is the fact that there are two separate current paths from the external charger input (VBUS) to the internal phone B+ supply rail (B+). One of these is a current-limited path through external FET’s M1 and M2 to the battery positive terminal. This path is used to charge the battery and therefore is called the charge path. The second path is a non-charging path through D1 and M4 to the B+ node, (BP pin). (B+ is the main phone supply node from which most other internal phone power rails are derived, MC13883 pin BP is attached to it.) The basic supply path when a charger is not attached to the phone is from the battery through M3 to B+. The charge current is sensed through an external sense resistor (nominally 100 m Ω) limited to a current set by register bits ICHRG[3:0] via control of M1 and M2 through the CHRGCTRL pin. 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. 0.1 Ω Battery CHRGMODE + - OV Comp Batt Voltage Regulator with Current Limit and OV Protection + - VB[2:0] Voltage Error Amp ICHRG [3:0] Chrg In Diff Amp Chrg In Error Amp B+ BP Voltage Regulator and OV Protection VBUS (from mini-USB connector) M1 M2 M3 M4 D1 Rs VBUS OV_REF ISENSE CHRGCTRL BPFET + - ICHRG To A/D Convertor Input 4 3 OV_ENB + - + - + - OC_ REF + - BP Ref Voltage Error Amp OC Comp BP Curr Out Diff Amp FET Switching Ctrl Logic ICHRG_TR[2:0] 3 Trickle Charge Control BATT_FET BATTP FET_CTRL BP_FET_BIT BATT_FET_BIT From Detection Block MC13883 One Chip Charging Block Turnon Signal to Phone PWR_ON R3a 1 Ohm R3b 1 Ohm 2.2uF 2.2uF |
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