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TPS65270RGET Datasheet(PDF) 5 Page - Texas Instruments |
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TPS65270RGET Datasheet(HTML) 5 Page - Texas Instruments |
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5 / 25 page  TPS65270 www.ti.com SLVSAX7C – AUGUST 2011 – REVISED APRIL 2012 TERMINAL FUNCTIONS NO. NO. NAME DESCRIPTION (HTSSOP) (QFN) Enable for Buck 1. Logic high enables the Buck 1; Logic low disables Buck 1. If pin is left open a weak internal pull-up to V5V will allow for EN1 1 16 automatic enable; For a delayed start-up add a small ceramic capacitor from this pin to ground. Feedback voltage for Buck 1. Connect a resistor divider to set 0.8 V from FB1 2 17 the output of the converter to ground. Soft start input for Buck 1. An internal 5-µA charging current is sourcing to SS1 3 18 this pin. Connect a small ceramic capacitor to this pin to set the Buck 1 soft start time. Loop compensation pin for Buck 1. Connect a series RC circuit to this pin COMP1 4 19 to compensate the control loop of this converter. Low power operation mode. With active high, Buck 1 and Buck 2 operate LOW_P 5 20 at pulse skipping mode at light load; active low forces both Buck 1 and Buck 2 to PWM mode; this pin can’t be left open. Internal 6.5-V power supply bias. Connect a 10-µF ceramic capacitor from VCC 6 21 this pin to ground. AGND 7 22 Analog ground. Connect all GND pins and power pad together. Oscillator frequency setup. Connect a resistor to ground to set the ROSC 8 23 frequency of internal oscillator clock. Loop compensation pin for Buck 2. Connect a series RC circuit to this pin COMP2 9 24 to compensate the control loop of this converter. Soft start input for Buck 2. An internal 5-µA charging current is sourcing to SS2 10 1 this pin. Connect a small ceramic capacitor to this pin to set the Buck 1 soft start time. Feedback voltage for Buck 2. Connect a resistor divider to set 0.8 V from FB2 11 2 the output of the converter to ground. Enable for Buck 2. Logic high enables the Buck 2. Logic low disables Buck 2. If pin is left open a weak internal pull-up to V5V will allow for EN2 12 3 automatic enable; For a delayed start-up add a small ceramic capacitor from this pin to ground. Bootstrapped power supply to high side floating gate driver in Buck 2. BST2 13 4 Connect a 47-nF ceramic capacitor from this pin to the switching node pin LX2. Input supply for Buck 2. Connect a 10-µF ceramic capacitor close to this VIN2 14 5 pin. LX2 15, 16 6, 7 Switching node connecting to inductor for Buck 2. GND 17, 18, 19, 20 8, 9, 10, 11 Power ground for Buck 1 and Buck 2. LX1 21, 22 12, 13 Switching node connecting to inductor for Buck 1. Input supply for Buck 1. Conne ct a 10-µF ceramic capacitor close to this VIN1 23 14 pin. Bootstrapped power supply to high side floating gate driver in Buck 1. BST1 24 15 Connect a 47-nF ceramic capacitor from this pin to the switching node pin LX1. Must be soldered to PCB for optimal thermal performance. Have thermal Thermal Pad vias on the PCB to enhance power dissipation. Copyright © 2011–2012, Texas Instruments Incorporated Submit Documentation Feedback 5 Product Folder Link(s): TPS65270 |
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