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LTC3558EUD-PBF Datasheet(PDF) 11 Page - Linear Technology |
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LTC3558EUD-PBF Datasheet(HTML) 11 Page - Linear Technology |
11 / 32 page LTC3558 11 3558f PIN FUNCTIONS GND (Pin 1): Ground. Connect to Exposed Pad (Pin 21). BAT (Pin 2): Charge Current Output. Provides charge cur- rent to the battery and regulates final float voltage to 4.2V. MODE (Pin 3): MODE Pin for Switching Regulators. When held high, both regulators operate in Burst Mode Opera- tion. When held low, the buck regulator operates in pulse skip mode and the buck-boost regulator operates in PWM mode. This pin is a high impedance input; do not float. FB1 (Pin 4): Buck Regulator Feedback Voltage Pin. Re- ceives feedback by a resistor divider connected across the output. EN1 (Pin 5): Enable Input Pin for the Buck Regulator. This pin is a high impedance input; do not float. Active high. SW1 (Pin 6): Buck Regulator Switching Node. External inductor connects to this node. PVIN1 (Pin 7): Input Supply Pin for Buck Regulator. Con- nect to BAT and PVIN2. A single 10μF input decoupling capacitor to GND is required. PVIN2 (Pin 8): Input Supply Pin for Buck-Boost Regulator. Connect to BAT and PVIN1. A single 10μF input decoupling capacitor to GND is required. SWAB2 (Pin 9): Switch Node for Buck-Boost Regulator Connected to the Internal Power Switches A and B. External inductor connects between this node and SWCD2. SWCD2 (Pin 10): Switch Node for Buck-Boost Regulator Connected to the Internal Power Switches C and D. External inductor connects between this node and SWAB2. VOUT2 (Pin 11): Regulated Output Voltage for Buck-Boost Regulator. SUSP (Pin 12): Suspend Battery Charging Operation. A voltage greater than 1.2V on this pin puts the battery char- ger in suspend mode, disables the charger and resets the termination timer. A weak pull-down current is internally applied to this pin to ensure it is low at power-up when the input is not being driven externally. FB2 (Pin 13): Buck-Boost Regulator Feedback Voltage Pin. Receives feedback by a resistor divider connected across the output. VC2 (Pin 14): Output of the Error Amplifier and Voltage Compensation Node for the Buck-Boost Regulator. Ex- ternal Type I or Type III compensation (to FB2) connects to this pin. EN2 (Pin 15): Enable Input Pin for the Buck-Boost Regu- lator. This pin is a high impedance input; do not float. Active high. HPWR (Pin 16): High Current Battery Charging Enabled. A voltage greater than 1.2V at this pin programs the BAT pin current at 100% of the maximum programmed charge current. A voltage less than 0.4V sets the BAT pin current to 20% of the maximum programmed charge current. When used with a 1.74k PROG resistor, this pin can toggle between low power and high power modes per USB specification. A weak pull-down current is internally applied to this pin to ensure it is low at power-up when the input is not being driven externally. NTC (Pin 17): Input to the NTC Thermistor Monitoring Circuit. The NTC pin connects to a negative temperature coefficient thermistor which is typically co-packaged with the battery pack to determine if the battery is too hot or too cold to charge. If the battery temperature is out of range, charging is paused until the battery temperature re-enters the valid range. A low drift bias resistor is required from VCC to NTC and a thermistor is required from NTC to ground. To disable the NTC function, the NTC pin should be tied to ground. PROG (Pin 18): Charge Current Program and Charge Current Monitor Pin. Charge current is programmed by connecting a resistor from PROG to ground. When charg- ing in constant-current mode, the PROG pin servos to 1V if the HPWR pin is pulled high, or 200mV if the HPWR pin is pulled low. The voltage on this pin always represents the BAT pin current through the following formula: I PROG R BAT PROG = •800 CHRG (Pin 19): Open-Drain Charge Status Output. The CHRG pin indicates the status of the battery charger. Four possible states are represented by CHRG charging, not charging (i.e., the charge current is less than one-tenth |
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