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MAX77301EVKIT Datasheet(PDF) 4 Page - Maxim Integrated Products |
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MAX77301EVKIT Datasheet(HTML) 4 Page - Maxim Integrated Products |
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4 / 15 page  Maxim Integrated │ 4 www.maximintegrated.com Evaluates: MAX77301 MAX77301 Evaluation Kit Adapter Detection When an adapter is present on the USB receptacle (P1), the IC examines the external device to identify the type of adapter connected. The possible adapter types are: ● Dedicated charger ● USB charger (host or hub) ● USB 2.0 low power (host or hub) ● USB 2.0 high power (host or hub) Each of these different devices has different current capa- bility, as shown in Table 2. When an adapter is connected, the IC performs a series of tests to identify the type of device connected. Refer to the flow charts in the MAX77301 IC data sheet for more details. Smart Power Selector The Smart Power Selector seamlessly distributes power between the external adapter input (BUS), the battery (BAT+), and the system load (SYS). The Smart Power Selector basic functions are: 1) With both an external adapter and battery connected: a) When the system load requirements are less than the input-current limit, the battery is charged with residual power from the input. b) When the system load requirements exceed the input-current limit, the battery supplies supplemen- tal current to the load. 2) With the battery connected and no external power in- put, the system is powered from the battery. 3) With an external power input connected and no battery, the system is powered from BUS. If the junction temperature starts to get too hot (110°C, typ), the charging rate is reduced. If this is insufficient to cool down the IC, the input-current limit is then reduced. SYS Regulation Voltage The IC always regulates SYS to 140mV (typ) above BAT+, with a minimum voltage programmable from 3.4V to 4.5V, regardless of what device is connected. The 3.4V minimum voltage regulation reduces the ripple on SYS during peak load conditions where the input-current limit is tripped. Figure 1. Smart Power Selector Table 2. Adapter Types ADAPTER TYPE OUTPUT VOLTAGE OUTPUT CURRENT Dedicated charger 4.75V to 5.25V at ILOAD < 500mA; 2.0V to 5.25V for ILOAD ≥ 500mA 500mA to 1.8A Charger downstream port 4.75V to 5.25V at ILOAD < 500mA; 2.0V to 5.25V for ILOAD ≥ 500mA 500mA to 900mA for low-speed and full-speed operation; 500mA to 1.5A for low-speed and full-speed operation Apple 500mA 4.75V to 5.25V at ILOAD < 500mA 500mA (max) Apple 1A 4.75V to 5.25V at ILOAD < 1A 1A (max) Apple 2A 4.75V to 5.25V at ILOAD < 2A 2A (max) Sony 500mA 4.75V to 5.25V at ILOAD < 500mA 500mA (max) Sony 500mA type B 4.75V to 5.25V at ILOAD < 500mA 500mA (max) USB 2.0 low power 4.25V to 5.25V 100mA (max) USB 2.0 high power 4.75V to 5.25V 500mA (max) BUS BUS_DGND BAT+ BAT- CHARGE CURRENT Q2 CHARGE AND SYS LOAD SWITCH LOAD CURRENT GND Q1 SYS SYS_DGND SYSTEM LOAD 1-CELL Li+ MAX77301 |
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