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LTC4002-4.2 Datasheet(PDF) 6 Page - Linear Technology |
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LTC4002-4.2 Datasheet(HTML) 6 Page - Linear Technology |
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6 / 16 page  LTC4002-4.2 6 400242i PI FU CTIO S COMP (Pin 1/Pin 1): Compensation, Soft-Start and Shut- down Control Pin. The COMP pin is the control signal of the inner loop of the current mode PWM. Charging begins when the COMP pin reaches 800mV. The recommended compen- sation components are a 0.47 µF (or larger) capacitor and a 2.2k series resistor. A 100 µA current into the compen- sation capacitor also sets the soft-start slew rate. Pulling the COMP pin below 350mV will shut down the charger. VCC (Pin 2/Pin 2): Positive Supply Voltage Input. VCC can range from 4.7V to 24V. A 0.1 µF or higher capacitor is required at the VCC pin with the lead length kept to a mini- mum. A 10 µF low ESR capacitor is also required at the source pins of the power P-channel MOSFET. GATE (Pin 3/Pin 3): Gate Drive Output. Driver Output for the P-Channel MOSFET. The voltage at this pin is internally clamped to 8V below VCC, allowing a low voltage MOSFET with gate-to-source breakdown voltage of 8V or less to be used. PGND, SGND, Exposed Pad, GND (Pins 4, 5, 11/4): IC Ground. CHRG (Pin 6/Pin 5): Open-Drain Charge Status Output. When the battery is being charged, the CHRG pin is pulled low by an internal N-channel MOSFET. When the charge current drops to 25% of the full-scale current for more than 120 µs, the N-channel MOSFET turns off and a 25µA cur- rent source is connected from the CHRG pin to GND. When the timer runs out or the input supply is removed, the 25 µA current source is turned off and the CHRG pin becomes high impedance. BAT (Pin 7/Pin 6): Battery Sense Input. A bypass capaci- tor of 22 µF is required to minimize ripple voltage. An internal resistor divider, which is disconnected in sleep mode, sets the final float voltage at this pin. If the battery connection is opened when charging, an overvoltage circuit will limit the charger output voltage to 10% above the programmed float voltage. When VBAT is within 250mV of VCC, the LTC4002-4.2 is forced into sleep mode, dropping ICC to 10µA. SENSE (Pin 8/Pin 7):Current Amplifier Sense Input. A sense resistor, RSENSE, must be connected between the SENSE and BAT pins. The maximum charge current is equal to 100mV/RSENSE. NTC (Pin 9/Pin 8): NTC (Negative Temperature Coefficient) Thermistor Input. With an external 10k Ω NTC thermistor to ground, this pin senses the temperature of the battery pack and stops the charger when the temperature is out of range. When the voltage at this pin drops below 350mV at Undervoltage Lockout Threshold vs Temperature End-of-Charge Ratio vs VCC VCC (V) 5 21 25 29 10 15 20 25 400242 G21 TEMPERATURE ( °C) –50 25 400242 G22 4.2 –25 0 50 4.0 4.4 75 100 125 VCC RISING TYPICAL PERFOR A CE CHARACTERISTICS T A = 25°C, VCC = 10V unless otherwise noted. (DFN/SO-8) |
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Similar Description - LTC4002-4.2 |
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