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TPS62050DGSG4 Datasheet(PDF) 11 Page - Texas Instruments |
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TPS62050DGSG4 Datasheet(HTML) 11 Page - Texas Instruments |
11 / 25 page V I (min) + VO(max) ) IO(max) r DS(on) (max) ) RL IO(max) = Maximum output current plus inductor ripple current rDS(on)(max) = Maximum P-Channel switch rDS(on) RL = DC resistance of the inductor VO(max) = Nominal output voltage plus maximum output voltage tolerance , nominal 0.8% 1.6% –1.6% t VO TPS62052, TPS62054 TPS62056, TPS62050, TPS62051 www.ti.com SLVS432E – SEPTEMBER 2002 – REVISED JUNE 2011 Figure 17. Power-Save Mode Output Voltage Thresholds The converter enters the fixed frequency PWM mode again as soon as the output voltage falls below the comp low 2 threshold set to 1.6% below VO, nominal. Soft-Start The TPS6205x has an internal soft-start circuit that limits the inrush current during start-up. This prevents possible voltage drops of the input voltage if a battery or a high impedance power source is connected to the input of the TPS6205x. The soft-start is implemented as a digital circuit increasing the switch current in steps of 200 mA, 400 mA, 800 mA and then the typical switch current limit of 1.2 A. Therefore the start-up time mainly depends on the output capacitor and load current. Typical start-up time with a 22-µF output capacitor and a 200-mA load current is 1 ms. 100% Duty Cycle Low Dropout Operation The TPS6205x offers the lowest possible input to output voltage difference while still maintaining operation with the use of the 100% duty cycle mode. In this mode, the P-channel switch is constantly turned on. This is particularly useful in battery powered applications to achieve longest operation time by taking full advantage of the whole battery voltage range, i.e. The minimum input voltage to maintain regulation depends on the load current and output voltage and can be calculated as: Enable and Overtemperature Protection Logic low on EN forces the TPS6205x into shutdown. In shutdown, the power switch, drivers, voltage reference, oscillator, and all other functions are turned off. The supply current is reduced to less than 2 µA in the shutdown mode. When the device is in thermal shutdown, the bandgap is forced to stay on even if the device is set into shutdown by pulling EN to GND. As soon as the temperature drops below the threshold, the device automatically starts again. If an output voltage is present when the device is disabled, which could be an external voltage source or super cap, the reverse leakage current is specified under electrical characteristics. Pulling the enable pin high starts up the TPS6205x with the soft-start as described under the paragraph soft-start. If the EN pin is connected to any voltage other than VI or GND, an increased leakage current of typically 10 µA and up to 20 µA can occur. Copyright © 2002–2011, Texas Instruments Incorporated Submit Documentation Feedback 11 Product Folder Links: TPS62052 TPS62054 TPS62056 TPS62050 TPS62051 |
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