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TC1189 Datasheet(PDF) 7 Page - Microchip Technology |
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TC1189 Datasheet(HTML) 7 Page - Microchip Technology |
7 / 16 page 2002 Microchip Technology Inc. DS21364B-page 7 TC1188/TC1189 FIGURE 3-2: Functional Block Diagram. 3.4 Shutdown The SHDN input is used to turn off the LDO P-Channel pass MOSFET and internal bias. When shutdown, the typical quiescent current consumed by the LDO is 0.1 nA. A logic low (< 0.4V) at the SHDN input will cause the device to operate in the shutdown mode. A logic high (> 2.0V) at the SHDN input will cause the device to operate in the normal mode. 3.5 Current Limit The LDO output current is monitored internal to the TC1188/TC1189. The internal current sense will limit the LDO output current to a typical value of 280 mA. The current limit can range from approximately 50 mA to 410 mA from device to device. The internal current limit protects the device from a continuous output short circuit. 3.6 Thermal Overload Protection Integrated thermal protection circuitry shuts the TC1188/TC1189 off when the internal die temperature exceeds approximately 170°C. The regulator output remains off until the internal die temperature drops to approximately 150°C. 3.7 Operating Region and Power Dissipation The internal power dissipation to the LDO is primarily determined by the input voltage, output voltage and output current. The following equation is used to approximate the worst case for power dissipation: EQUATION The maximum power dissipation is a function of the maximum ambient temperature, TA(MAX), the maximum junction temperature, TJ(MAX), and the package thermal resistance from junction to air, θJA. The 5-Pin SOT23A package has a θJA of approximately 220°C/Watt. EQUATION Bandgap Reference MOS Driver With ILIMIT Thermal Sensor Shutdown Logic Error + – VIN SHDN GND VOUT PMOS Pass GND N (TC1189 Only) Amplifier Transistor PD = VIN(MAX) - VOUT(MIN) x ILOAD(MAX) Where: P D = Worst case internal power dissipation. V IN (MAX) = Maximum input voltage. V OUT (MIN) = Minimum output voltage. I LOAD (MAX) = Maximum output current. PD = (TJ(MAX) - TA(MAX))/θJA Where all terms are previously defined. |
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