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TPS65279V Datasheet(PDF) 8 Page - Texas Instruments |
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TPS65279V Datasheet(HTML) 8 Page - Texas Instruments |
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8 / 46 page  TPS65279V SLVSBW1B – FEBRUARY 2013 – REVISED JANUARY 2014 www.ti.com TERMINAL FUNCTIONS NO. NO. NAME DESCRIPTION (HTSSOP) (QFN) EN1, EN2 1, 2 32, 33 Enable pin. Adjust the input under-voltage lockout with two resistors. PGND2 3, 4 34, 35, 36 Power ground of Buck 2, place the input capacitor’s ground pin as close as possible to this pin. PVIN2 5, 6 1, 2 Power input. Input power supply to the power switches of the power converter 2. ADDR 7 3 I2C address configuration pin. Connect this pin to low, high or leave it open to select different I2C slave address. MODE 8 4 Operation mode control pin. Connect this pin to ground to choose forced PWM mode without current sharing; leave the pin open for pulse skipping mode (PSM) operation at light load condition; connect this pin to V7V to choose forced PWM mode and current sharing with paralleling two bucks. V7V 9 5 Internal low-drop linear regulator (LDO) output to power internal driver and control circuits. Decouple this pin to power ground with a minimum 1-µF ceramic capacitor. Output regulates to typical 6.3 V for optimal conduction on-resistances of internal power MOSFETs. In PCB design, the power ground and analog ground should have one-point common connection at the (-) terminal of V7V bypass capacitor. If VIN is lower than 6.3 V, V7V will be slightly lower than VIN. VIN 10 6 Power supply of the internal LDO and controllers PVIN1 11, 12 7, 8 Power input. Input power supply to the power switches of the power converter 1. PGND1 13, 14 9, 10, 11 Power ground of Buck 1, place the input capacitor’s ground pin as close as possible to this pin. SDA 15 12 I2C interface data pin SCL 16 13 I2C interface clock pin FB1 17 14 Feedback sensing pin for the external feedback resistors in Buck 1. Before I2C controlled VID selection is enabled, an external resistor divider connects to this pin to pre-set the output voltage. VOUT1 18 15 Buck 1 output voltage sensing pin; When I2C controlled VID selection is enabled, output voltage can be programmed from 0.68 V to 1.95 V with 10-mV steps. In current sharing application, this pin is the output voltage sensing pin. BST1 19 16 Add a bootstrap capacitor between BST1 and LX1. The voltage on this capacitor carries the gate drive voltage for the high-side MOSFET. LX1 20, 21 17, 18, 19 Switching node of Buck 1 SS1 22, 27 20, 25 Soft-start and voltage tracking in Buck 1. An external capacitor connected to this pin sets the internal voltage reference rise time. Since the voltage on this pin overrides the internal reference, it can be used for tracking and sequencing. In current sharing application, this pin serves as the soft-start pin. COMP1 23 21 Error amplifier output and loop compensation pin for Buck 1. Connect frequency compensation to this pin; In current sharing application, this pin serves as the compensation pin. ROSC 24 22 Oscillator frequency programmable pin. Connect an external resistor to set the switching frequency. When connected to an external clock, the internal oscillator synchronizes to the external clock. AGND 25 23 Analog ground of the controllers COMP2 26 24 Error amplifier output and loop compensation pin for Buck 2. Connect frequency compensation to this pin. In current sharing application, connect this pin to ground. SS2 27 25 Soft-start and voltage tracking in Buck 2. An external capacitor connected to this pin sets the internal voltage reference rise time. Since the voltage on this pin overrides the internal reference, it can be used for tracking and power sequencing. In current sharing application, connect this pin to ground. LX2 28, 29 26, 27, 28 Switching nodes 8 Submit Documentation Feedback Copyright © 2013–2014, Texas Instruments Incorporated Product Folder Links: TPS65279V |
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