Datasheet LT3651-8.2, LT3651-8.4 (Analog Devices) - 8
| Fabricante | Analog Devices |
| Descripción | Monolithic 4A High Voltage 2-Cell Li-Ion Battery Charger |
| Páginas / Página | 24 / 8 — PIN FUNCTIONS. SHDN (Pin 27):. VIN (Pins 32, 33, 34):. RNG/SS (Pin 35):. … |
| Formato / tamaño de archivo | PDF / 354 Kb |
| Idioma del documento | Inglés |
PIN FUNCTIONS. SHDN (Pin 27):. VIN (Pins 32, 33, 34):. RNG/SS (Pin 35):. ILIM (Pin 28):. CLP/CLN (Pin 29/Pin 30):. RT (Pin 36):
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LT3651-8.2/LT3651-8.4
PIN FUNCTIONS
and can sink currents up to 10mA when enabled. CHRG ply to the CLP pin, connecting a sense resistor from the is pulled low during a battery charging cycle. When the CLP pin to the CLN pin and then connecting CLN to VIN. charge cycle is terminated, the CHRG pin becomes high The system load is then delivered from the CLN pin. The impedance. If the internal timer is used for termination, LT3651-8.2/LT3651-8.4 servo the maximum charge cur- the pin stays low during the charging cycle until the charge rent required to maintain programmed maximum system current drops below a C/10 rate, or approximately 10% current. The system current limit is set as a function of of the maximum charge current. A temperature fault also the voltage on the ILIM pin and the input current sense causes this pin to be pulled low. resistor. This function is disabled by shorting CLP, CLN
SHDN (Pin 27):
Shutdown Pin. This pin can be used for and VIN together. precision UVLO functions. When this pin rises above the
VIN (Pins 32, 33, 34):
Charger Input Supply. These pins 1.20V threshold, the part is enabled. The pin has 95mV of provide power for the LT3651-8.2/LT3651-8.4. Charge voltage hysteresis. When in shutdown mode, all charging current for the battery flows into these pins. IVIN is less functions are disabled. When the SHDN pin is pulled below than 100µA after charge termination. Connect the pins 0.4V, the IC enters a low current shutdown mode where together. the VIN pin current is reduced to 17µA. Typical SHDN pin
RNG/SS (Pin 35):
Charge Current Range and Soft-Start input bias current is 10nA. Connect the pin to VIN if the Pin. This pin allows for setting and dynamic adjustment shutdown function is not desired. of the maximum charge current, and can be used to em-
ILIM (Pin 28):
Input Current Limit Programming. This pin ploy a soft-start function. The voltage on this pin sets the allows for setting and dynamic adjustment of the system maximum charge current by setting the maximum voltage input current limit, and can be used to employ a soft-start across the charge current sense resistor, RSENSE , placed function. The voltage on this pin sets the maximum input between SENSE and BAT. current by setting the maximum voltage across the input The effective range on the pin is 0V to 1V. 50µA is sourced current sense resistor, placed between CLP and CLN. from this pin usually to a resistor (RRNG/SS) to ground. The effective range on the pin is 0V to 1V. 50µA is sourced VRNG/SS represents approximately 10 times the maximum from this pin usually to a resistor (RILIM) to ground. VIILIM voltage across the charge current sense resistor. If no RRNG/ represents approximately 11 times the maximum voltage SS is used the part will default to maximum charge current. across the input current sense resistor. If no RILIM is used Soft-start functionality for charge current can be imple- the part will default to maximum input current. mented by connecting a capacitor (CRNG/SS) from RNG/SS Soft-start functionality for input current can be imple- to ground. The soft-start capacitor and the programming mented with a capacitor (CILIM) from ILIM to ground. The resistor can be implemented in parallel. The RNG/SS pin soft-start capacitor and the programming resistor can be is pulled low during fault conditions, allowing graceful implemented in parallel. recovery from faults if CRNG/SS is used.
CLP/CLN (Pin 29/Pin 30):
System Current Limit Positive
RT (Pin 36):
Switcher Oscillator Timer Set Pin. A resis- and Negative Input. System current levels are monitored tor from this pin to ground sets the switcher oscillator by connecting a sense resistor from the input power sup- frequency. Typically this is 54.9k for fOSC = 1MHz. 36518284fa 8 For more information www.linear.com/LT3651-8.2 Document Outline Features Applications Description Typical Application Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Operation Applications Information Typical Applications Typical Application Related Parts
PIN FUNCTIONS
and can sink currents up to 10mA when enabled. CHRG ply to the CLP pin, connecting a sense resistor from the is pulled low during a battery charging cycle. When the CLP pin to the CLN pin and then connecting CLN to VIN. charge cycle is terminated, the CHRG pin becomes high The system load is then delivered from the CLN pin. The impedance. If the internal timer is used for termination, LT3651-8.2/LT3651-8.4 servo the maximum charge cur- the pin stays low during the charging cycle until the charge rent required to maintain programmed maximum system current drops below a C/10 rate, or approximately 10% current. The system current limit is set as a function of of the maximum charge current. A temperature fault also the voltage on the ILIM pin and the input current sense causes this pin to be pulled low. resistor. This function is disabled by shorting CLP, CLN
SHDN (Pin 27):
Shutdown Pin. This pin can be used for and VIN together. precision UVLO functions. When this pin rises above the
VIN (Pins 32, 33, 34):
Charger Input Supply. These pins 1.20V threshold, the part is enabled. The pin has 95mV of provide power for the LT3651-8.2/LT3651-8.4. Charge voltage hysteresis. When in shutdown mode, all charging current for the battery flows into these pins. IVIN is less functions are disabled. When the SHDN pin is pulled below than 100µA after charge termination. Connect the pins 0.4V, the IC enters a low current shutdown mode where together. the VIN pin current is reduced to 17µA. Typical SHDN pin
RNG/SS (Pin 35):
Charge Current Range and Soft-Start input bias current is 10nA. Connect the pin to VIN if the Pin. This pin allows for setting and dynamic adjustment shutdown function is not desired. of the maximum charge current, and can be used to em-
ILIM (Pin 28):
Input Current Limit Programming. This pin ploy a soft-start function. The voltage on this pin sets the allows for setting and dynamic adjustment of the system maximum charge current by setting the maximum voltage input current limit, and can be used to employ a soft-start across the charge current sense resistor, RSENSE , placed function. The voltage on this pin sets the maximum input between SENSE and BAT. current by setting the maximum voltage across the input The effective range on the pin is 0V to 1V. 50µA is sourced current sense resistor, placed between CLP and CLN. from this pin usually to a resistor (RRNG/SS) to ground. The effective range on the pin is 0V to 1V. 50µA is sourced VRNG/SS represents approximately 10 times the maximum from this pin usually to a resistor (RILIM) to ground. VIILIM voltage across the charge current sense resistor. If no RRNG/ represents approximately 11 times the maximum voltage SS is used the part will default to maximum charge current. across the input current sense resistor. If no RILIM is used Soft-start functionality for charge current can be imple- the part will default to maximum input current. mented by connecting a capacitor (CRNG/SS) from RNG/SS Soft-start functionality for input current can be imple- to ground. The soft-start capacitor and the programming mented with a capacitor (CILIM) from ILIM to ground. The resistor can be implemented in parallel. The RNG/SS pin soft-start capacitor and the programming resistor can be is pulled low during fault conditions, allowing graceful implemented in parallel. recovery from faults if CRNG/SS is used.
CLP/CLN (Pin 29/Pin 30):
System Current Limit Positive
RT (Pin 36):
Switcher Oscillator Timer Set Pin. A resis- and Negative Input. System current levels are monitored tor from this pin to ground sets the switcher oscillator by connecting a sense resistor from the input power sup- frequency. Typically this is 54.9k for fOSC = 1MHz. 36518284fa 8 For more information www.linear.com/LT3651-8.2 Document Outline Features Applications Description Typical Application Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Operation Applications Information Typical Applications Typical Application Related Parts