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TPS62700YZF Datasheet(PDF) 6 Page - Texas Instruments |
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TPS62700YZF Datasheet(HTML) 6 Page - Texas Instruments |
6 / 25 page ) R R ( I V V L MAX _ DSON MAX _ OUT MIN _ OUT MIN _ IN + ´ + = (1) ENABLE SHORT-CIRCUIT PROTECTION THERMAL SHUTDOWN UNDERVOLTAGE LOCKOUT CLOCK DITHERING TYPICAL CHARACTERISTICS TPS62700, TPS62701 SLVS784B – DECEMBER 2007 – REVISED JUNE 2008................................................................................................................................................... www.ti.com With further decreases of VIN, the High-Side MOSFET switch is turned on completely. In this case, the converter offers a low input-to-output voltage difference. This is particularly useful in battery-powered applications to achieve longest operation time by taking full advantage of the entire battery voltage range. The minimum input voltage to maintain regulation depends on the load current and output voltage, and can be calculated as: With: IOUT_MAX = maximum output current plus inductor ripple current RDSON_MAX = maximum P-channel switch RDSON. RL = DC resistance of the inductor VOUT_MAX = nominal output voltage plus maximum output voltage tolerance The device is enabled by setting the EN pin to high and at first the internal circuits are settled. Afterwards the device activates the soft start circuit and ramps up the output voltage. The output voltage is ramped up from 0 V to 3.09 V within typically 190 µs after the EN pin changes from low to high. A low signal at the EN pin sets the device in Shutdown Mode with less than 2 µA current consumption. The High-Side and Low-Side MOSFET switches are protected with maximum output current = ILIMF in case a short circuit on the output occurs. When the High-Side MOSFET switch reaches its current limit, it is turned off, and the Low-Side MOSFET switch is turned on. The High-Side MOSFET switch can only turn on again, after the current in the Low-Side MOSFET switch decreases below its current limit. As soon as the junction temperature, TJ, exceeds 150°C (typical) the device goes into thermal shutdown. In this mode, the High-Side and Low-Side MOSFETs are turned-off. The device continues its operation when the junction temperature falls by typical 20°C. The device stops operation at typ. 1.5 V with falling input voltage and starts operation at typ. 1.7 V with rising input voltage. This prevents malfunction of the device due to low input voltage. In order to reduce switch frequency harmonics in the higher RF bands, the TPS62701 has a built-in clock-dithering circuit. Typical Characteristic Graphs FIGURE Switching Frequency vs Input Voltage (VIN) Figure 1 RDSON vs VIN, N-Channel Figure 2 RDSON vs VIN, P-Channel Figure 3 Shutdown Current (ISD) vs Temperature Figure 4 Quiescent Current (IQ) into AVIN vs VIN Figure 5 EN High Threshold Voltage vs VIN Figure 6 Efficiency vs Output Current Figure 7 Efficiency vs Output Current Figure 8 Efficiency vs Output Voltage Figure 9 Efficiency vs Output Voltage Figure 10 6 Submit Documentation Feedback Copyright © 2007–2008, Texas Instruments Incorporated Product Folder Link(s): TPS62700 TPS62701 |
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