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LTC4006 Datasheet(PDF) 6 Page - Linear Technology |
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LTC4006 Datasheet(HTML) 6 Page - Linear Technology |
6 / 20 page 6 LTC4006 4006fa PI FU CTIO S CSP (Pin 9): Current Amplifier CA1 Input. This pin and the BAT pin measure the voltage across the sense resistor, RSENSE, to provide the instantaneous current signals re- quired for both peak and average current mode operation. BAT (Pin 10): Battery Sense Input and the Negative Reference for the Current Sense Resistor. A precision internal resistor divider sets the final float potential on this pin. The resistor divider is disconnected during shutdown. CLP (Pin 11): Positive Input to the Supply Current Limiting Amplifier, CL1. The threshold is set at 100mV above the voltage at the CLN pin. When used to limit supply current, a filter is needed to filter out the switching noise. If no current limit function is desired, connect this pin to CLN. CLN (Pin 12): Negative Reference for the Input Current Limit Amplifier, CL1. This pin also serves as the power supply for the IC. A 10 µF to 22µF bypass capacitor should be connected as close as possible to this pin. TGATE (Pin 13): Drives the top external P-channel MOSFET of the battery charger buck converter. PGND (Pin 14): High Current Ground Return for the BGATE Driver. BGATE (Pin 15): Drives the bottom external N-channel MOSFET of the battery charger buck converter. INFET (Pin 16): Drives the Gate of the External Input PFET. RT (Pin 4): Timer Resistor. The timer period is set by placing a resistor, RRT, to GND. The timer period is tTIMER = (1hour • RRT/154k) If this resistor is not present, the charger will not start. GND (Pin 5): Ground for low power circuitry. NTC (Pin 6): A thermistor network is connected from NTC to GND. This pin determines if the battery temperature is safe for charging. The charger and timer are suspended if the thermistor indicates a temperature that is unsafe for charging. The thermistor function may be disabled with a 300k to 500k resistor from DCIN to NTC. ITH (Pin 7): Control Signal of the Inner Loop of the Current Mode PWM. Higher ITH voltage corresponds to higher charging currrent in normal operation. A 6.04k resistor, in series with a capacitor of at least 0.1 µF to GND, provides loop compensation. Typical full-scale output current is 40 µA. Nominal voltage range for this pin is 0V to 3V. IMON (Pin 8): Current Monitoring Output. The voltage at this pin provides a linear indication of charging current. Peak current is equivalent to 1.19V. Zero current is ap- proximately 0.309V. A capacitor from IMON to ground is required to filter higher frequency components. If VBAT < 2.5V/cell, then V(IMON) = 1.19V when conditioning a depleted battery. Any current sourced or sinked from this pin directly affects the charging current accuracy. If this pin is to be monitored, a high impedance input buffer should be used. TEST CIRCUIT – + – + – + EA LT1055 LTC4006 VREF 11.67 µA BAT 10 CSP 9 ITH 0.6V 4006 TC 7 35mV 3k |
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Similar Description - LTC4006 |
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