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LD3980PM135R Datasheet(PDF) 9 Page - STMicroelectronics |
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LD3980PM135R Datasheet(HTML) 9 Page - STMicroelectronics |
9 / 16 page LD3980 Detailed description 9/16 6 Detailed description The device is a low-dropout, low quiescent current linear regulator designed primarily for battery-powered applications. It supplies a regulated output voltage for load currents up to 300mA. The LD3980 consists of a precision bandgap, error amplifier, output p-channel MOS. The 0.7V bandgap reference is connected to the error amplifier. The error amplifier compares this reference to the feedback voltage and amplifies the difference. The MOSFET driver reads the error signal and applies the appropriate drive to the P-channel pass transistor. If the feedback voltage is lower than reference voltage, the pass transistor is pulled lower, allowing more current to pass and increasing the output voltage. If the feedback voltage is higher than the reference voltage, the pass transistor gate is driven higher, allowing less current to pass the output. The output voltage is feedback through an internal resistor voltage connected to OUT. Additional blocks include an output current limiter, a thermal sensor and shutdown logic. 6.1 Shutdown Drive SHDN low to place the LD3980 in shutdown mode for DFN versions. In shutdown mode, the pass transistor, control circuit, reference and all biases are turned off, reducing the supply current to typically 0.5µA. Connecting SHDN to IN every block is in normal operation. 6.2 Current limit The device includes short-circuit protection. It includes a current limiter that controls the pass transistor's gate voltage to limit the output current to about 600mA. 6.3 Thermal overload protection The Thermal over load protection limits total power dissipation in the device. When the junction temperature (TJ) exceeds +140°C, the thermal sensor sends a signal to the shutdown logic, turning off the pass transistor and allowing the device to cool. The pass transistor turns on again after the device's junction temperature typically cools by 15°C, resulting in a pulsed output during continuous thermal overload conditions. 6.4 Power dissipation Maximum power dissipation of the LD3980 depends on the thermal resistance of the case and circuit board, the temperature difference between the die junction and ambient air, and the rate of air flow. The power dissipated by the device is: PD = IO (VI - VO) The maximum power dissipation is: PMAX = (TJMAX - TA) / θ JA Where: TJMAX = +150°C |
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