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TPS61001DGS Datasheet(PDF) 5 Page - Texas Instruments |
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TPS61001DGS Datasheet(HTML) 5 Page - Texas Instruments |
5 / 22 page TPS61000, TPS61001, TPS61002, TPS61003, TPS61004, TPS61005, TPS61006, TPS61007 SINGLE- AND DUAL-CELL BOOST CONVERTER WITH START-UP INTO FULL LOAD SLVS279C – MARCH 2000 – REVISED APRIL 2003 5 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 detailed description (continued) under-voltage lockout An under-voltage lockout function prevents the device start-up if the supply voltage on VBAT is lower than approximately 0.7 V. This undervoltage lockout function is implemented in order to prevent the malfunctioning of the converter. When in operation and the battery is being discharged, the device automatically enters the shutdown mode if the voltage on VBAT drops below approximately 0.7 V. If the EN pin is hardwired to VBAT and if the voltage at VBAT drops temporarily below the UVLO threshold voltage, the device switches off and does not start up again automatically, even if the supply voltage rises above 0.9 V. The device starts up again only after a signal change from low to high on EN or if the battery voltage is completely removed. low Battery detector circuit (LBI and LBO) The low-battery detector circuit is typically used to supervise the battery voltage and to generate an error flag when the battery voltage drops below a user-set threshold voltage. The function is active only when the device is enabled. When the device is disabled, the LBO pin is high impedance. The LBO pin goes active low when the voltage on the LBI pin decreases below the set threshold voltage of 500 mV ±15 mV, which is equal to the internal reference voltage. The battery voltage, at which the detection circuit switches, can be programmed with a resistive divider connected to the LBI pin. The resistive divider scales down the battery voltage to a voltage level of 500 mV, which is then compared to the LBI threshold voltage. The LBI pin has a built-in hysteresis of 10 mV. See the application section for more details about the programming of the LBI threshold. If the low-battery detection circuit is not used, the LBI pin should be connected to GND (or to VBAT) and the LBO pin can be left unconnected. Do not let the LBI pin float. low-EMI switch The device integrates a circuit which removes the ringing that typically appears on the SW-node when the con- verter enters the discontinuous current mode. In this case, the current through the inductor ramps to zero and the Schottky diode stops conducting. Due to remaining energy that is stored in parasitic components of the diode, inductor, and switch, a ringing on the SW pin is induced. The integrated antiringing switch clamps this voltage internally to VBAT and therefore dampens this ringing. The antiringing switch is turned on by a comparator that monitors the voltage between SW and VOUT. This voltage indicates when the diode is reverse biased. The ringing on the SW-node is damped to a large degree, reducing the electromagnetic interference generated by the switching regulator to a very great extent. adjustable output voltage (TPS61000 and TPS61007 only) The accuracy of the internal voltage reference, the controller topology, and the accuracy of the external resistor divider determine the accuracy of the adjustable output voltage versions. The reference voltage has an accuracy of ±4% over line, load, and temperature. The controller switches between fixed frequency and pulse-skip mode, depending on load current. This adds an offset to the output voltage that is equivalent to 1% of VO. Using 1% accurate resistors for the feedback divider, a total accuracy of ±6% can be achieved over the complete temperature and output current range. The TPS61007 is an improved adjustable output voltage version. Ground shift in the feedback loop was eliminated by adding a separate ground pin for the feedback resistor divider (FBGND). |
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