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TPS62403 Datasheet(PDF) 18 Page - Texas Instruments |
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TPS62403 Datasheet(HTML) 18 Page - Texas Instruments |
18 / 39 page www.ti.com 95% 5% tRAMP t Startup EN VOUT 100% Duty Cycle Low Dropout Operation Vin min + Voutmax ) Ioutmax RDSonmax ) RL (3) Under-Voltage Lockout MODE SELECTION TPS62400 ,, TPS62401 TPS62403 SLVS681C – JUNE 2006 – REVISED DECEMBER 2006 DETAILED DESCRIPTION (continued) Figure 32. Soft Start The converters offer a low 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. The minimum input voltage to maintain regulation depends on the load current and output voltage, and can be calculated as: with: Ioutmax = maximum output current plus inductor ripple current RDSonmax = maximum P-channel switch RDSon. RL = DC resistance of the inductor Voutmax = nominal output voltage plus maximum output voltage tolerance With decreasing load current, the device automatically switches into pulse skipping operation in which the power stage operates intermittently based on load demand. By running cycles periodically the switching losses are minimized and the device runs with a minimum quiescent current, maintaining high efficiency. The under-voltage lockout circuit prevents the device from malfunctioning at low input voltages, and from excessive discharge of the battery, and disables the converters. The under-voltage lockout threshold is typically 1.5V; maximum of 2.35V. In case the default register values are overwritten by the Interface, the new values in the registers REG_DEF_1_High, REG_DEF_1_Low and REG_DEF_2 remain valid as long the supply voltage does not fall below the under-voltage lockout threshold, independent of whether the converters are disabled. The MODE/DATA pin allows mode selection between forced PWM Mode and Power Save Mode for both converters. Furthermore, this pin is a multipurpose pin and provides (besides Mode selection) a one-pin interface to receive serial data from a host to set the output voltage. This is described in the EasyScale™ Interface section. Connecting this pin to GND enables the automatic PWM and power save mode operation. The converters operates in fixed-frequency PWM mode at moderate-to-heavy loads, and in the PFM mode during light loads, maintaining high efficiency over a wide load current range. 18 Submit Documentation Feedback |
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