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TPS61041 Fiches technique(PDF) 4 Page - Texas Instruments |
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TPS61041 Fiches technique(HTML) 4 Page - Texas Instruments |
4 / 27 page I LIM 4 I LIM 2 TPS61040 TPS61041 SLVS413F – OCTOBER 2002 – REVISED DECEMBER 2010 www.ti.com SOFT START All inductive step-up converters exhibit high inrush current during start-up if no special precaution is made. This can cause voltage drops at the input rail during start up and may result in an unwanted or early system shut down. The TPS61040/41 limits this inrush current by increasing the current limit in two steps starting from for 256 cycles to for the next 256 cycles, and then full current limit (see Figure 14). ENABLE Pulling the enable (EN) to ground shuts down the device reducing the shutdown current to 1 mA (typical). Because there is a conductive path from the input to the output through the inductor and Schottky diode, the output voltage is equal to the input voltage during shutdown. The enable pin needs to be terminated and should not be left floating. Using a small external transistor disconnects the input from the output during shutdown as shown in Figure 18. UNDERVOLTAGE LOCKOUT An undervoltage lockout prevents misoperation of the device at input voltages below typical 1.5 V. When the input voltage is below the undervoltage threshold, the main switch is turned off. THERMAL SHUTDOWN An internal thermal shutdown is implemented and turns off the internal MOSFETs when the typical junction temperature of 168°C is exceeded. The thermal shutdown has a hysteresis of typically 25°C. This data is based on statistical means and is not tested during the regular mass production of the IC. ABSOLUTE MAXIMUM RATINGS over operating free-air temperature (unless otherwise noted) (1) UNIT Supply voltages on pin VIN (2) –0.3 V to 7 V Voltages on pins EN, FB (2) –0.3 V to VIN + 0.3 V Switch voltage on pin SW (2) 30 V Continuous power dissipation See Dissipation Rating Table TJ Operating junction temperature –40°C to 150°C Tstg Storage temperature –65°C to 150°C (1) Stresses beyond those listed under absolute maximum ratings may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated under recommended operating conditions is not implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability. (2) All voltage values are with respect to network ground terminal. DISSIPATION RATING TABLE DERATING TA ≤ 25°C FACTOR TA = 70°C TA = 85°C PACKAGE RqJA POWER RATING ABOVE POWER RATING POWER RATING TA = 25°C DBV 250°C/W 357 mW 3.5 mW/°C 192 mW 140 mW DDC, DRV 76°C/W 1300 mW 13 mW/°C 688 mW 500 mW 4 Submit Documentation Feedback Copyright © 2002–2010, Texas Instruments Incorporated Product Folder Link(s): TPS61040 TPS61041 |
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