MAX77751

3.15A USB-C Autonomous Charger

for 1-Cell Li+ Batteries

www.maximintegrated.com

Maxim Integrated | 34

Figure 12. System Configuration for Temperature Management

If the system does not have an MCU which can get the INOKB signal from the MAX77751 and provide the enable or

disable signal to ITOPOFF of the MAX77751, the circuit depicted in Figure 13 can provide the same function which the

MCU does in Figure 12. The Hot and Cold Temperature Detection portion of the circuit detects if the temperature is

greater than the hot threshold or less than the cold threshold

signal (Active High) to the INOKB Control portion of the circuit, which can control the disable signal according to the

INOKB status. If INOKB is high (i.e., the charger input is not valid), the disable signal from the temperature detection part

is blocked. If INOKB is low (i.e., the charger input is valid), the disable signal passes through the INOKB Control part and

reach the ITOPOFF pin of the MAX77751. If the output of the temperature detection part is high (i.e., the disable signal)

when INOKB is low, ITOPOFF is pulled low, and battery charging through the MAX77751 is disabled.

ITOPOFF

RTOPOFF

GPIO

(OPEN DRAIN

OUTPUT)

MCU

MAX77751

INOKB

GPIO

(INPUT)

ADC

THERMISTOR