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MAX8600 Datasheet(PDF) 7 Page - Maxim Integrated Products |
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MAX8600 Datasheet(HTML) 7 Page - Maxim Integrated Products |
7 / 13 page Detailed Description DC Charging The MAX8600/MAX8601 are designed to charge a sin- gle-cell Li+ battery from a DC source voltage between 4.15V and 7V. The precharge current, charge current, and top-off threshold are programmable with RSETI. USB Charging (MAX8601) The MAX8601 contains a USB input that allows opera- tion from either a DC source or a USB port. A USEL input allows the user to select either a 100mA or 500mA maxi- mum charging current when using the USB input. If both VUSB and VDC are valid, the MAX8601 operates from DC. If VDC is invalid (undervoltage/overvoltage), the MAX8601 operates from USB. When charging at 100mA from the USB input, the fast-charge timer is inhibited. EN Charger-Enable Input EN is a logic input (active low) that enables the charger. Drive EN high to disable the charger-control circuitry. Drive EN low or connect to GND for normal operation. Soft-Start To prevent input transients, the rate of change of charging current is limited. When the charger is turned on or when the input source is changed, charge current is ramped from 0 to the set current value in typically 1.2ms. This also means that if charging is taking place from USB, and the DC input is then powered, charge current falls to zero and then is reramped to the DC charge rate. This is done to ensure that the DC source is not subjected to a severe load current step. Charge-current ramp up is also limited when transition- ing from prequal to fast-charge, and when changing the USB charge current from 100mA to 500mA with USEL. There is no di/dt limiting, however, if ISET is changed suddenly using a switch at RSETI. Thermal-Limit Control The MAX8600/MAX8601 feature a thermal limit that reduces the charge current when the die temperature exceeds +100°C. As the temperature increases above +100°C, the IC lowers the charge current by 5%/°C. CHG Charge-Indicator Output CHG is an open-drain output that indicates charger sta- tus. CHG goes low during charge cycles where VBAT is greater than 3V and IBAT is greater than 7.5% of the maximum charge current set by RSETI. When the MAX8600/MAX8601 are used in conjunction with a microprocessor (µP), connect a pullup resistor between CHG and the logic I/O voltage to indicate charge status to the µP. Alternatively, CHG can sink up to 20mA for an LED charge indicator. Fault Indicator ( FLT) The MAX8600/MAX8601 contain an open-drain FLT output to signal the user when a fault occurs. FLT goes low if the charger is in prequal and the prequal timer expires, or if the charger is in fast-charge and the fast- charge time expires. FLT does NOT go low if the THM thermistor temperature is out of range. Toggle EN or the input power to reset the FLT indicator. Power-OK Indicator ( POK) The MAX8600/MAX8601 contain an open-drain POK out- put that goes low when a valid input source is detected at DC or USB (MAX8601 only). A valid input source is one whose voltage is between 4.15V and 7V and exceeds the battery voltage by 320mV. After a valid input has been established, charging is sustained with inputs as low as 3.5V as long as the input voltage remains above the battery voltage by at least 55mV (typ). POK is high impedance when the charger is disabled. Applications Information Figure 2 shows the typical operating circuit for the MAX8601. The following section describes component changes for different charging current and timer durations. Single-/Dual-Input 1-Cell Li+ Chargers with OVP Protection and Programmable Charge Timer _______________________________________________________________________________________ 7 BAT NTC 10k Ω AT +25 °C RSETI 2k Ω CT THM AC ADAPTER 4.5V TO 7V (OVP TO 16V) USB PORT 4.5V TO 5.5V GND USB EN OFF ON FLT TO LOGIC SUPPLY (3.3V) 100k Ω 100k Ω 330 Ω FAULT POWER-OK CCT 0.068 μF 1 μF DC SETI USEL POK CHG MAX8601 500mA 100mA 2.2 μF Figure 2. Typical Operating Circuit for USB/AC-Adapter Input Charger. An RSETI of 2k Ω sets an AC adapter fast-charge of 750mA. |
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