Datasheet

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SLVS426 − MAY 2002

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5-V REGULATOR

An internal linear voltage regulator is used for the high-side driver bootstrap. Since the input voltage ranges from 4.5 V to

28 V, this feature offers a fixed bootstrap voltage to simplify the drive design. It is active if the STBY_VREF5 is HIGH and

has a tolerance of 4%. The 5-V regulator is used for powering the low-side driver and the VREF. When this regulator is

disconnected from the MOSFET drivers, it is used only for the source of VREF.

3.3-V REGULATOR

The TPS5130 has a 3.3-V linear regulator. The output is made from the internal 5-V regulator or an external 5 V from the

REG5V_IN pin. The maximum output current of this regulator is limited to 30 mA by an output current limit control. A ceramic

capacitor of 4.7 µF should be connected between the VREF3.3 and GND pins to stabilize the output voltage.

EXTERNAL 5-V INPUT AND 5-V SWITCH

If the internal 5-V switch detects 5-V input from the REG5V_IN pin, the internal 5-V regulator is disconnected from the

MOSFET drivers. The external 5 V is used for both the high-side bootstrap and the low-side driver, thus increasing the

efficiency. When an excess voltage is applied to the REG5V_IN pin, the OVP timer starts to charge the FLT capacitor and

latches all the MOSFET drivers and the LDO at OFF state after a set time.

PHASE INVERTER

The SBRC3 of the TPS5130 operates in the same phase as the internal triangular oscillator output while the SBRC1 and

the SBRC2 operate 180 degrees out of phase. When the SBRC1 and the SBRC3 (or the SBRC2 and the SBRC3) share

the same input power supply, the TPS5130 realizes 180 degrees out of phase operation that reduces input current ripple

and enables the input capacitor value smaller.