JAJSHL2 June 2019 TPS652170
PRODUCTION DATA.
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The TPS652170 device has a linear charger for Li+ batteries, and TI recommends that a battery is included in designs for ideal performance. However, the device can operate without a battery attached. Three basic use cases are available for operation without a battery:
Figure 61 shows the connection of the input power supply to the device for 5-V only operation, with 20-V input overvoltage protection. Figure 62 shows the connection of the input power supply to the device for 5-V only operation without 20-V input overvoltage protection. Table 37 lists the functional differences between both setups.
RESOURCE IMPACTED | POWER SUPPLIED THROUGH AC PIN
(CASE (1) AND (2)) |
POWER SUPPLIED THROUGH BAT PIN
(CASE (3)) |
---|---|---|
Input protection | The maximum operating input voltage is 5.8 V, but the device is protected from input overvoltage up to 20 V. | The maximum operating input voltage is 5.5 V. |
Power efficiency | The input current for DC/DC converters passes through AC-SYS power-path switch (approximately 150 mΩ). | The internal power path is bypassed to minimize I2R losses. |
BATTEMP bit | The BATTEMP bit (bit 0 in register 0x03) always reads 1, but has no effect on operation of the device. | The BATTEMP bit (bit 0 in register 0x03) always reads 0. |
Output rail status on initial power connection | The LDO1 regulator is automatically powered up when the AC pin is connected to the 5-V supply, and the device goes to the WAIT PWR_EN state. If the PWR_EN pin is not asserted within 5 s, the LDO1 regulator turns OFF. | The LDO1 regulator is OFF when the BAT pin is connected to the 5-V supply. The PB_IN pin must be pulled low to go to the WAIT PWR_EN state. The PB_IN pin cannot stay low for greater than 8 s or a reset will occur. |
Response to input overvoltage | Device goes to the OFF state.(1) | Not applicable |
Power path | In an application with one source of input power, if the input power drops below UVLO and recovers before reaching 100 mV, the rising edge may not be detected by the device. This condition, known as a brownout, can cause a lockup of the device in which the I2C is responsive but SYS is not connected to the AC or USB through the power path. (2) | Not applicable |