LTM8061 datasheet(7/20 Pages) LINER

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LTM8061

8061f

PIN FUNCTIONS

GND (Bank 1): Power and Signal Ground Return.

BAT (Bank 2): Battery Charge Current Output Bus. The

charge function operates to achieve the final float voltage

at this pin. The auto-restart feature initiates a new charge

cycle when the voltage at the BAT pin falls 2.5% below

the float voltage. Once the charge cycle is terminated, the

input bias current of the BAT pin is reduced to minimize

battery discharge while the charger remains connected.

In most applications, connect BIAS to BAT.

VINA (Bank 3): Anode of Input Reverse Protection Schottky

Diode. Connect the input power here if input voltage

protection is desired.

VINC/CLP (Bank 4): This pad bank connects to the cathode

of the input reverse protection diode. In addition, system

current levels can be monitored by connecting a sense

resistor from this pin to the VIN pin. Additional system

load is drawn from the VIN pin connection, and maximum

system load is achieved when VVINC/CLP – VVIN= 50mV. The

LTM8061 servos the charge current required to maintain

programmed maximum system current. If this function is

not desired, connect the VINC/CLP pin to the VIN pin (see

the Applications Information section). Do not raise this

pin above VIN + 0.5V.

VIN (Bank 5): Charger Input Supply. Apply CIN here. Con-

nect the input power here if no input power rectification

is required.

BIAS (Pin G7): The BIAS pin connects to the internal power

bus. Connect to a power source greater than 2.5V and less

than 10V. In most applications, connect BIAS to BAT.

CHRG (Pin K7): Open-Collector Charger Status Output.

Typically pulled up through a resistor to a reference volt-

age. This status pin can be pulled up to voltages as high

as VIN and can sink currents up to 10mA. During a battery

charge cycle, CHRG is pulled low. When the charge cycle

terminates, the CHRG pin becomes high impedance. If

the internal timer is used for termination, the pin stays

low during the charge cycle until the charge current drops

below a C/10 rate even though the charger will continue to

top off the battery until the end-of-charge timer terminates

the charge cycle. A temperature fault also causes this pin

to be pulled low (see the Applications Information sec-

tion). If RUN is low, or the LTM8061 is otherwise powered

down, the state of the CHRG pin is invalid.

NTC (Pin H6): Battery Temperature Monitor Pin. This pin

is the input to the NTC (negative temperature coefficient)

thermistor temperature monitoring circuit. This function is

enabled by connecting a 10kΩ,

β = 3380 NTC thermistor

from the NTC pin to ground. The pin sources 50μA, and

monitors the voltage across the 10kΩ thermistor. When

the voltage on this pin is above 1.36V (T < 0°C) or below

0.29V (T > 40°C), charging is disabled and the CHRG and

FAULT pins are both pulled low. If internal timer termina-

tion is being used, the timer is paused, suspending the

charge cycle. Charging resumes when the voltage on NTC

returns to within the 0.29V to 1.36V active region. There

is approximately 5°C of temperature hysteresis associated

with each of the temperature thresholds. The temperature

monitoring function remains enabled while thermistor

resistance to ground is less than 250kΩ. If this function

is not desired, leave the NTC pin unconnected.

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