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LTC4052EMS8E-4.2 Datasheet(PDF) 4 Page - Linear Technology |
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LTC4052EMS8E-4.2 Datasheet(HTML) 4 Page - Linear Technology |
4 / 12 page LTC4052-4.2 4 405242f PI FU CTIO S SENSE (Pin 1): Overcurrent Sense Input. A sense resistor (RSENSE) should be connected from VIN to the SENSE pin to program the current limit level. When overcurrent limit is tripped, the pass transistor immediately turns off and turns back on after a 640ms time-out period (CTIMER = 0.1 µF). The on-off cycle will continue as long as the overcurrent condition persists or until the timer runs out. If overcurrent protection is not needed, short SENSE to VIN. ACPR (Pin 2): AC Wall Adapter Present Open-Drain Out- put. When the input voltage (wall adapter) is applied to the LTC4052, this pin is pulled to ground by an internal N-channel MOSFET capable of driving an LED. VIN (Pin 3): Positive Input Supply Voltage (4.5V ≤ VIN ≤ 10V). Bypass this pin with a 1 µF capacitor in series with a 4.7 Ω resistor. GND (Pin 4): Electrical Ground Connection and provides a thermal path from the IC to the PC board copper. The exposed backside of the package is also ground and must be soldered to the PC board for maximum power dissipa- tion. TIMER (Pin 5): Timer Set Pin. The timer period is pro- grammed by a capacitor (CTIMER) to ground. The timer period is: tTIMER = (CTIMER • 3Hr)/(0.1µF). The minimum ON time, minimum OFF time and the overcurrent time-out period all scale with tTIMER. CHRG (Pin 6): Charge Status Open-Drain Output. When a depleted battery is being charged, the CHRG pin is pulled to ground by an internal N-channel MOSFET capable of driving an LED. Once the duty cycle at the GATE pin drops below 10%, the N-MOSFET turns off and a weak 40 µA current source to ground turns on to indicate a near end- of-charge C/10 condition. When a time-out occurs or the input supply is removed, the CHRG pin becomes high impedance. GATE (Pin 7): Gate Drive Output Pin for Internal and External Pass Transistors. An external N-MOSFET transis- tor can be connected in parallel with the internal transistor to reduce the on-resistance for higher charge current. In this case, an external blocking diode on VIN is required to prevent damage to the battery if VIN is shorted to ground. A 10 µAcurrentsourcepullsthispinuptothechargepump voltage when turned on and a 40 µA current source pulls it down to ground to turn it off. If an overcurrent condition is detected, the GATE pin is immediately pulled to ground. The voltage at this pin is internally clamped to 12V above the GND pin. TYPICAL PERFOR A CE CHARACTERISTICS TEMPERATURE ( °C) –50 105.8 105.6 105.4 105.2 105.0 104.8 104.6 25 75 4053 G07 –25 0 50 100 125 TEMPERATURE ( °C) –50 100 4053 G08 050 650 600 550 500 450 400 350 300 250 –25 25 75 125 VBAT = 4V VBAT = 2.6V Overcurrent Sense Voltage Switch On-Resistance vs Temperature |
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