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TPS51222RTVT Datasheet(PDF) 8 Page - Texas Instruments |
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TPS51222RTVT Datasheet(HTML) 8 Page - Texas Instruments |
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8 / 42 page  TPS51222 SLUS908 – JANUARY 2009............................................................................................................................................................................................... www.ti.com PIN FUNCTIONS (continued) PIN I/O DESCRIPTION NAME NO. SKIPSEL1 6 Skip mode selection pin. GND: Continuous conduction mode I VREF2: Auto Skip SKIPSEL2 19 VREG3: OOA Auto Skip, maximum 7 skips (suitable for fsw < 400kHz) VREG5: OOA Auto Skip, maximum 15 skips (suitable for equal to or greater than 400kHz) SW2 25 I/O High-side MOSFET gate driver returns. SW1 32 VREG5 switchover power supply input pin. When EN1 is high, PGOOD1 indicates GOOD and V5SW voltage is higher than 4.8 V, switch-over function is enabled. V5SW 2 I Note: When switch-over is enabled, VREG5 output voltage is approximately equal to the V5SW input voltage. VBST1 31 Supply inputs for high-side N-channel FET driver (boot strap terminal). Connect a capacitor (0.1- µF or I greater is recommended) from this pin to respective SW terminal. Additional SB diode from VREG5 to this VBST2 26 pin is an optional. VFB1 9 SMPS voltage feedback Inputs. Connect the feedback resistors divider, and should be referred to (signal) I GND. VFB2 16 VIN 23 I Supply input for 5-V and 3.3-V linear regulator. Typically connected to VBAT. VREF2 13 O 2-V reference output. Bypass to (signal) GND with 0.22- µF of ceramic capacitance. Always alive 3.3 V, 10 mA low dropout linear regulator output. Bypass to (signal) GND with more than 1- µF VREG3 22 O ceramic capacitance. Runs from VIN supply or from VREG5 when it is switched over to V5SW input. 5-V, 100-mA low dropout linear regulator output. Bypass to (power) GND using a 10- µF ceramic capacitor. Runs from VIN supply. Internally connected to VBST and DRVL. Shuts off with EN. Switches over to V5SW VREG5 29 O when 4.8 V or above is provided. Note: When switch-over (see above V5SW) is enabled, VREG5 output voltage is approximately equal to V5SW input voltage. 8 Submit Documentation Feedback Copyright © 2009, Texas Instruments Incorporated Product Folder Link(s) :TPS51222 |
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