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TPS6213xA-Q1 Datasheet(PDF) 11 Page - Texas Instruments |
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TPS6213xA-Q1 Datasheet(HTML) 11 Page - Texas Instruments |
11 / 37 page ( ) ns L V V I I OUT IN LIMF typ peak 30 ) ( × - + = PD L LIMF typ peak t L V I I × + = ) ( 11 TPS62130A-Q1, TPS62133A-Q1, TPS6213013A-Q1 www.ti.com SLVSCC2B – MAY 2014 – REVISED NOVEMBER 2016 Product Folder Links: TPS62130A-Q1 TPS62133A-Q1 TPS6213013A-Q1 Submit Documentation Feedback Copyright © 2014–2016, Texas Instruments Incorporated Feature Description (continued) (1) Maximum allowed voltage is 7V. Therefore it's recommended to connect it to VOUT, not VIN. Using a very small capacitor (or leaving SS/TR pin un-connected) provides fastest startup behavior. The TPS6213xA-Q1 can start into a pre-biased output. During monotonic pre-biased startup, both of the power MOSFETs are not allowed to turn on until the device's internal ramp sets an output voltage above the pre-bias voltage. As long as the output is below about 0.5V, a reduced current limit of typically 1.6A is set internally. If the device is set to shutdown (EN=GND), undervoltage lockout or thermal shutdown, an internal resistor pulls the SS/TR pin down to ensure a proper low level. Returning from those states causes a new startup sequence as set by the SS/TR connection. A voltage supplied to SS/TR can be used for tracking a master voltage. The output voltage will follow this voltage in both directions up and down (see Application and Implementation). 9.3.6 Current Limit And Short Circuit Protection The TPS6213xA-Q1 is protected against heavy load and short circuit events. If a short circuit is detected (VOUT drops below 0.5V), the current limit is reduced to 1.6A typically. If the output voltage rises above 0.5V, the device runs in normal operation again. At heavy loads, the current limit determines the maximum output current. If the current limit is reached, the high-side FET turns off. Avoiding shoot through current, the low-side FET switches on to allow the inductor current to decrease. The low-side current limit is typically 3.5A. The high-side FET turns on again, only if the current in the low-side FET has decreased below the low-side current limit threshold. The output current of the device is limited by the current limit (see Electrical Characteristics). Due to internal propagation delay, the actual current can exceed the static current limit during that time. The dynamic current limit can be calculated as follows: where • ILIMF is the static current limit, specified in the Electrical Characteristics, • L is the inductor value, • VL is the voltage across the inductor (VIN - VOUT) and • tPD is the internal propagation delay. (4) The current limit can exceed static values, especially if the input voltage is high and very small inductances are used. The dynamic high side switch peak current can be calculated as follows: spacing (5) 9.3.7 Power Good (PG) The TPS6213xA-Q1 has a built in power good (PG) function to indicate whether the output voltage has reached its appropriate level or not. The PG signal can be used for startup sequencing of multiple rails. The PG pin is an open-drain output that requires a pull-up resistor (to any voltage below 7V). It can sink 2mA of current and maintain its specified logic low level. TPS6213xA-Q1 features PG=Low when the device is turned off due to EN, UVLO or thermal shutdown and can be used to actively discharge VOUT (see Figure 37). VIN must remain present for the PG pin to stay Low. If unused, the PG pin may be left floating. 9.3.8 Pin-Selectable Output Voltage (DEF) The output voltage of the TPS6213xA-Q1 can be increased by 5% above the nominal voltage by setting the DEF pin to High (1). When DEF is Low, the device regulates to the nominal output voltage. Increasing the nominal voltage allows adapting the power supply voltage to the variations of the application hardware. More detailed information on voltage margining using TPS6213xA-Q1 can be found in SLVA489. A pull down resistor of about 400kOhm is internally connected to the pin, to ensure a proper logic level if the pin is high impedance or floating after initially set to Low. The resistor is disconnected if the pin is set High. |
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