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MCP73871 Datasheet(PDF) 18 Page - Microchip Technology |
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MCP73871 Datasheet(HTML) 18 Page - Microchip Technology |
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18 / 36 page  MCP73871 DS20002090F-page 18 2008-2022 Microchip Technology Inc. and its subsidiaries Table 4-1 shows the chip behavior based upon the operating conditions. TABLE 4-1: CHIP BEHAVIOR REFERENCE TABLE 4.1 UnderVoltage Lockout (UVLO) An internal undervoltage lockout (UVLO) circuit monitors the input voltage and keeps the charger in shutdown mode until the input supply rises above the UVLO threshold. In the event a battery is present when the input power is applied, the input supply must rise approximately 100 mV above the battery voltage before the MCP73871 device becomes operational. The UVLO circuit places the device in Shutdown mode if the input supply falls to within approximately 100 mV of the battery voltage. The UVLO circuit is always active. At any time the input supply is below the UVLO threshold or falls within approximately 100 mV of the voltage at the VBAT pin, the MCP73871 device is placed in Shutdown mode. During any UVLO condition, the battery reverse discharge current is less than 2 µA. 4.2 System Load Sharing The system load sharing feature gives the system output pin (OUT) priority, allowing the system to power- up with deeply depleted battery packs. With the SEL input active-low, the MCP73871 device is designed to provide system power and Li-Ion battery charging from a USB input while adhering to the current limits governed by the USB specification. With the SEL input active-high, the MCP73871 device limits the total supply current to 1.8A (system power and charge current combined). FIGURE 4-2: System Load Sharing Diagram. VIN ?VBAT CE VBAT ?VOUT State 1 VBAT >VIN 00 0 — Shutdown OFF OFF 2 1 Battery powered system ON 3 VIN >VBAT 0 0 X — Shutdown OFF 4 VIN >VBAT 1 0 0 — Shutdown ON OFF OFF 5 1 Battery powered system ON 6 1 0 VBAT <VOUT Standby ON OFF ON OFF 7 VBAT >VOUT IN + BAT powered system ON 8 1 VBAT <VOUT IN powered, Charge possible OFF ON/OFF 9 VBAT >VOUT IN + BAT powered system ON OFF 0.2 Ideal Diode, Synchronous Switch Direction Control 0.2 Current Limit Direction Control Charge FET System Power FET VBAT IN OUT Charge Control |
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