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TPS65257RHAT Fiches technique(PDF) 6 Page - Texas Instruments |
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TPS65257RHAT Fiches technique(HTML) 6 Page - Texas Instruments |
6 / 34 page TPS65257 SLVSB32 – SEPTEMBER 2011 www.ti.com TERMINAL FUNCTIONS NAME NO. I/O DESCRIPTION Current limit setting for Buck3. Fit a resistor from this pin to ground to set RLIM3 1 I the peak current limit on the output inductor. Soft start pin for Buck3. Fit a small ceramic capacitor to this pin to set the SS3 2 I converter soft start time. Compensation for Buck3. Fit a series RC circuit to this pin to complete COMP3 3 O the compensation circuit of this converter. Feedback pin for Buck3. Connect a divider set to 0.8 V from the output of FB3 4 I the converter to ground. PB_IN 5 I Push button input (active low) Oscillator set. This resistor sets the frequency of internal autonomous ROSC 6 I clock. Feedback pin for Buck1. Connect a divider set to 0.8 V from the output of FB1 7 I the converter to ground. Compensation pin for Buck1. Fit a series RC circuit to this pin to complete COMP1 8 O the compensation circuit of this converter. Soft-start pin for Buck1. Fit a small ceramic capacitor to this pin to set the SS1 9 I converter soft-start time. Current limit setting pin for Buck1. Fit a resistor from this pin to ground to RLIM1 10 I set the peak current limit on the output inductor. Enable pin for Buck1. A high signal on this pin enables the regulator EN1 11 I Buck. For a delayed start-up add a small ceramic capacitor from this pin to ground. Bootstrap capacitor for Buck1. Fit a 47-nF ceramic capacitor from this pin BST1 12 to the switching node. VIN1 13 I Input supply for Buck1. Fit a 10- µF ceramic capacitor close to this pin. LX1 14, 15 O Switching node for Buck1 LX2 16, 17 O Switching node for Buck2 VIN2 18 I Input supply for Buck2. Fit a 10- µF ceramic capacitor close to this pin. Bootstrap capacitor for Buck2. Fit a 47-nF ceramic capacitor from this pin BST2 19 to the switching node. Enable pin for Buck2. A high signal on this pin enables the regulator. For EN2 20 I a delayed start-up add a small ceramic capacitor from this pin to ground. Current limit setting pin for Buck2. Fit a resistor from this pin to ground to RLIM2 21 I set the peak current limit on the output inductor. Soft-start pin for Buck2. Fit a small ceramic capacitor to this pin to set the SS2 22 I converter soft-start time. Compensation pin for Buck2. Fit a series RC circuit to this pin to complete COMP2 23 O the compensation circuit of this converter. Feedback input for Buck2. Connect a divider set to 0.8 V from the output FB2 24 I of the converter to ground. Forces PWM operation in all converters when set high. If low converters F_PWM 25 will operate in automatic PFM/PWM mode. INT 26 O Open drain interrupt output Power good. Open drain output asserted low after all converters and PGOOD 27 O sequenced and within regulation. Polarity is factory selectable (active high default). Internal supply. Connect a 10- µF ceramic capacitor from this pin to V7V 28 O ground. Internal supply. Connect a 10- µF ceramic capacitor from this pin to V3V 29 O ground. GND 30 Ground IC 31 I This pin should be connected to V7V pin USB_VIN 32 I USB switch Input supply USB_Vo 33 USB switch output USB_EN 34 I Enable input, high turns on the switch 6 Submit Documentation Feedback Copyright © 2011, Texas Instruments Incorporated Product Folder Link(s): TPS65257 |
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