LLTC4100EG 데이터 시트보기 (PDF) - Linear Technology

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LLTC4100EG

Smart Battery Charger Controller

Linear Technology 

LTC4100

Pin Functions

VLIM (Pin 14): An external resistor is connected between

this pin and GND. The value of the external resistor pro-

grams the range and resolution of the charging voltage.

This is a digital, not an analog, function.

THB (Pin 15): SafetySignal Force/Sense Pin to Smart

Battery. See description of operation for more detail. The

maximum allowed combined capacitance on THA, THB and

SafetySignal is 1nF (see Figure 4). A series resistor 54.9k

needs to be connected between this pin and the battery’s

SafetySignal for this circuit to work correctly.

THA (Pin 16): SafetySignal Force/Sense Pin to Smart

Battery. See description of operation for more detail. The

maximum allowed combined capacitance on THA, THB

and SafetySignal is 1nF (see Figure 4). A series resistor

1130Ω needs to be connected between this pin and the

battery’s SafetySignal for this circuit to work correctly.

VDD (Pin 17): Power Supply Input for the LTC4100 Digital

Circuitry. Bypass this pin with 0.1µF. Typically between

3.3V and 5VDC.

VSET (Pin 18): Tap Point of the Programmable Resistor

Divider, which Provides Battery Voltage Feedback to the

Charger.

ITH (Pin 19): Control Signal of the Inner Loop of the Current

Mode PWM. Higher ITH corresponds to higher charging

current in normal operation. A 0.0015µF capacitor to GND

filters out PWM ripple. Typical full-scale output current

is 40µA. Nominal voltage range for this pin is 0V to 3V.

IDC (Pin 20): Bypass to GND with a 0.068µF Capacitor.

CSP (Pin 21): Current Amplifier CA1 Input. This pin and

the BAT pin measure the voltage across the sense resis-

tor, RSENSE, to provide the instantaneous current signals

required for both peak and average current mode operation.

BAT (Pin 22): Battery Sense Input and the Negative Refer-

ence for the Current Sense Resistor. A bypass capacitor

of at least 10µF is required.

CLN (Pin 23): Negative Input to the Input Current Limiting

Circuit Block. If no current limit function is desired, connect

this pin to CLP. The threshold is set at 100mV below the

voltage at the CLP pin. When used to limit supply current,

a filter is needed to filter out the switching noise.

CLP (Pin 24): Positive Input to the Input Current Limiting

Circuit Block. This pin also serves as a power supply for

the IC.

4100fc

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For more information www.linear.com/LTC4100

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