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TPS65010RGZT Datasheet(PDF) 24 Page - Texas Instruments |
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TPS65010RGZT Datasheet(HTML) 24 Page - Texas Instruments |
24 / 63 page ![]() TPS65010 SLVS149C – JUNE 2003 – REVISED SEPTEMBER 2015 www.ti.com where • IO(max) = maximum output current plus inductor ripple current • rDS(on)max= maximum P-channel switch rDSon. • RL = DC resistance of the inductor • VO(max)= nominal output voltage plus maximum output voltage tolerance (2) 7.3.2.6 Active Discharge When Disabled When the CORE and MAIN converters are disabled, due to an UVLO, BATT_COVER or OVERTEMP condition, it is possible to actively pull down the outputs. This feature is disabled per default and is individually enabled through the VDCDC1 and VDCDC2 registers in the serial interface. When this feature is enabled, the core and main outputs are discharged by a 400- Ω (typical) load. 7.3.2.7 Power Good Monitoring Both the MAIN and CORE converters have power good comparators. Each comparator indicates when the relevant output voltage has dropped 10% below its target value, with 5% hysteresis. The outputs of these comparators are available in the REGSTATUS register through the serial interface. A maskable interrupt is generated when any voltage rail drops below the 10% threshold. The comparators are disabled when the converters are disabled. 7.3.2.8 Overtemperature Shutdown The MAIN and CORE converters are automatically shut down if the temperature exceeds the trip point (see the electrical characteristics). This detection is only active if the converters are in PWM mode, either by setting FPWM = 1, or if the output current is high enough that the device runs in PWM mode automatically. 7.3.3 Low-Dropout Voltage Regulators The low-dropout voltage regulators are designed to operate with low value ceramic input and output capacitors. They operate with input voltages down to 1.8 V. The LDOs offer a maximum dropout voltage of 300 mV at rated output current. Each LDO sports a current limit feature. Both LDOs are enabled per default, both LDOs can be disabled or programmed through the serial interface using the VREGS1 register. The LDO outputs (when enabled) are monitored by power good comparators, the outputs of which are available through the serial interface. The LDOs also have reverse conduction prevention when disabled. This allows the possibility to connect external regulators in parallel in systems with a backup battery. 7.3.3.1 Power Good Monitoring Both the LDO1 and LDO2 linear regulators have power good comparators. Each comparator indicates when the relevant output voltage has dropped 10% below it's target value, with 5% hysteresis. The outputs of these comparators are available in the REGSTATUS register through the serial interface. An interrupt is generated when any voltage rail drops below the 10% threshold. The LDO2 comparator is disabled when LDO2 is disabled. The LDO1 power good comparator is always active since it generates the system reset signal, RESPWRON, see the System Reset and Control Signal Section below. This also allows the possibility to monitor VLDO1, even if it is provided by an external regulator. 7.3.3.2 Enable and Sequencing Enabling and sequencing of the DC-DC converters and LDOs is described in the power-up sequencing section. The OMAP1510 processor from Texas Instruments requires that the core power supply is enabled before the I/O power supply, which means that the CORE converter should power up before the MAIN converter. This is achieved by connecting PS_SEQ to GND. 7.3.4 Undervoltage Lockout The undervoltage lockout circuit for the four regulators on TPS65010 prevents the device from malfunctioning at low input voltages and from excessive discharge of the battery. Basically it prevents the converter from turning on the power switch or rectifier FET under undefined conditions. The undervoltage threshold voltage is set by default to 3.25 V. After power-up, the threshold voltage can be reprogrammed through the serial interface. The undervoltage lockout comparator compares the voltage on the VCC pin with the UVLO threshold. When the VCC 24 Submit Documentation Feedback Copyright © 2003–2015, Texas Instruments Incorporated Product Folder Links: TPS65010 |
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