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LTC4008 Datasheet(PDF) 10 Page - Linear Technology |
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LTC4008 Datasheet(HTML) 10 Page - Linear Technology |
10 / 48 page LTC1760 10 1760fa GB1O (Pin 8): BAT1 Output Switch Gate Drive. Together with GB1I, this pin drives the gate of the P-channel switch in series with the BAT1 input switch. GB1I (Pin 9): BAT1 Input Switch Gate Drive. Together with GB1O, this pin drives the gate of the P-channel switch connected to the BAT1 input. GB2O (Pin 10): BAT2 Output Switch Gate Drive. Together with GB2I, this pin drives the gate of the P-channel switch in series with the BAT2 input switch. GB2I (Pin 11): BAT2 Input Switch Gate Drive. Together with GB2O, this pin drives the gate of the P-channel switch connected to the BAT2 input. CLP (Pin 36): The Positive Input to the Supply Current Limiting Amplifier CL1. The threshold is set at 100mV above the voltage at the DCIN pin. When used to limit supply current, a filter is needed to filter out the switching noise. Battery Charging Related VSET (Pin 13): The Tap Point of a Programmable Resistor Divider which Provides Battery Voltage Feedback to the Charger. A capacitor from CSN to VSET and from VSET to GND provide necessary compensation and filtering for the voltage loop. ITH (Pin 14): The Control Signal of the Inner Loop of the Current Mode PWM. Higher ITH voltage corresponds to higher charging current in normal operation. A capacitor of at least 0.1μF to GND filters out PWM ripple. Typical full-scale output current is 30μA. Nominal voltage range for this pin is 0V to 2.4V. ISET (Pin 15): A capacitor from ISET to GND is required to filterhigherfrequencycomponentsfromthedelta-sigmaIDAC. ILIMIT (Pin 32): An external resistor (RILIMIT) is connected between this pin and GND. The value of the external resis- tor programs the range and resolution of the programmed charger current. VLIMIT (Pin 33): An external resistor (RVLIMIT)is connected between this pin and GND. The value of the external resis- tor programs the range and resolution of the voltage DAC. CSN (Pin 34): Current Amplifier CA1 Input. Connect this to the common output of the charger MUX switches. CSP (Pin 35): Current Amplifier CA1 Input. This pin and the CSN pin measure the voltage across the charge cur- rent sense resistor, RSENSE, to provide the instantaneous current signals required for both peak and average current mode operation. COMP1 (Pin 37): The Compensation Node for the Am- plifier CL1. A capacitor is required from this pin to GND if input current amplifier CL1 is used. At input adapter current limit, this node rises to 1V. By forcing COMP1 to GND, amplifier CL1 will be defeated (no adapter current limit). COMP1 can source 10μA. BGATE (Pin 39): Drives the gate of the bottom external MOSFET of the battery charger buck converter. SW (Pin 42): PWM Switch Node. Connected to the source of the top external MOSFET. Used as reference for top gate driver. BOOST (Pin 43): Supply to Topside Floating Driver. The bootstrap capacitor is returned to this pin. Voltage swing at this pin is from a diode drop below VCC to (DCIN + VCC). TGATE (Pin 44): Drives the gate of the top external MOSFET of the battery charger buck converter. SCH1 (Pin 45), SCH2 (Pin 48): Charger MUX N-Channel Switch Source Returns. These two pins are connected to the sources of the back-to-back switch pairs Q3/Q4 and Q9/Q10 (see Typical Applications). A small pull-down cur- rent source returns these nodes to 0V when the switches are turned off. GCH1 (Pin 46), GCH2 (Pin 47): Charger MUX N-Channel Switch Gate Drives. These two pins drive the gates of the back-to-back switch pairs, Q3/Q4 and Q9/Q10, between the charger output and the two batteries (see Typical Applications). External Power Supply Pins VPLUS (Pin 1): Supply. The VPLUS pin is connected via four internal diodes to the DCIN, SCN, BAT1, and BAT2 pins. Bypass this pin with a 0.1μF capacitor and a 1μF capacitor (see Typical Applications for complete circuit). BAT1 (Pin 3), BAT2 (Pin 2): These two pins are the inputs from the two batteries for power to the LTC1760. PIN FUNCTIONS |
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Similar Description - LTC4008 |
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