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TPS62260 Datasheet(PDF) 8 Page - Texas Instruments |
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TPS62260 Datasheet(HTML) 8 Page - Texas Instruments |
8 / 33 page Outputvoltage Vout (PWM) Vout +1% PFMComparator threshold VoltagePositioning Lightload PFMMode moderatetoheavyload PWMMode TPS62260, TPS62261, TPS62262, TPS62263 SLVS763E – JUNE 2007 – REVISED JULY 2015 www.ti.com Feature Description (continued) Figure 5. Power Save Mode Operation With Automatic Mode Transition 8.3.2 Undervoltage Lockout The undervoltage lockout circuit prevents the device from malfunctioning at low input voltages and from excessive discharge of the battery and disables the output stage of the converter. The undervoltage lockout threshold is typically 1.85 V with falling VIN. 8.3.3 Mode Selection The MODE pin allows mode selection between forced PWM mode and power save mode. Connecting this pin to GND enables the power save mode with automatic transition between PWM and PFM mode. Pulling the MODE pin high forces the converter to operate in fixed frequency PWM mode even at light load currents. This allows simple filtering of the switching frequency for noise sensitive applications. In this mode, the efficiency is lower compared to the power save mode during light loads. The condition of the MODE pin can be changed during operation and allows efficient power management by adjusting the operation mode of the converter to the specific system requirements. 8.3.4 Enable The device is enabled by setting the EN pin to high. During the start up time tStart Up the internal circuits are settled and the soft start circuit is activated. The EN input can be used to control power sequencing in a system with various DC/DC converters. The EN pin can be connected to the output of another converter, to drive the EN pin high and getting a sequencing of supply rails. With EN = GND, the device enters shutdown mode in which all internal circuits are disabled. In fixed output voltage versions, the internal resistor divider network is then disconnected from FB pin. 8.3.5 Thermal Shutdown As soon as the junction temperature, TJ, exceeds 140°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 below the thermal shutdown hysteresis. 8 Submit Documentation Feedback Copyright © 2007–2015, Texas Instruments Incorporated Product Folder Links: TPS62260 TPS62261 TPS62262 TPS62263 |
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Similar Description - TPS62260_15 |
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