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TPS544B25RVFR Datasheet(PDF) 4 Page - Texas Instruments |
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TPS544B25RVFR Datasheet(HTML) 4 Page - Texas Instruments |
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4 / 100 page  4 TPS544C25, TPS544B25 SLUSC81 – MAY 2015 www.ti.com Product Folder Links: TPS544C25 TPS544B25 Submit Documentation Feedback Copyright © 2015, Texas Instruments Incorporated Pin Functions (continued) NAME NO. DESCRIPTION DATA 4 PMBus DATA pin. See Supported PMBus Commands section. DIFFO 33 Output of the differential remote sense amplifier. FB 34 Feedback pin for the control loop. Negative input of the error amplifier. GND 13 Power stage ground return. 14 15 16 17 18 19 20 PGND 26 Power ground return for controller device. Connect to GND at the thermal tab. PGOOD 36 Power good output. Open drain output that floats up when the device is operating and in regulation. Any fault condition causes this pin to pull low. Please refer to Table 7 for the possible sources to pull down PGOOD pin. RT 40 Frequency-setting resistor. Connect a resistor from this pin to AGND to program the switching frequency. Do not leave this pin floating. SMBALERT 6 SMBus alert pin. See SMBus specification. SW 8 Switched power output of the device. Connect the output averaging filter and bootstrap capacitor to this group of pins. 9 10 11 12 SYNC/RESET_B 39 For switching frequency synchronization or output voltage reset. The SYNC function allows synchronizing the oscillator to an external source that is either slower of faster than the nominal free running oscillator frequency. To use the SYNC function, VSET pin should be pulled up to BP3 or set the FORCE_SYNC bit in register MISC_CONFIG_OPTIONS (MFR_SPECIFIC_32) (F0h) if VSET function is used; if synchronization is not required, pull the SYNC pin to BP3. If the VSET pin is connected to AGND through a valid resistor to configure default output voltage, SYNC/RESET_B is configured as RESET_B function when FORCE_SYNC is not set. Then the logic low on the SYNC/RESET_B pin restores the output voltage to default value set by VSET without power cycling. When SYNC/RESET_B is configured as RESET_B function, there is an internal 200kΩ pull-up resistor to BP3. TSNS/SS 37 External temperature sense signal input or alternatively used to set default soft-start time by connecting a resistor from this pin to AGND. Do not leave this pin floating. Disable TSNS by pulling TSNS to AGND and unsetting SS_DET_DIS in OPTIONS (MFR_SPECIFIC_21) (E5h) in applications where neither is needed. VDD 29 Input power to the controller. Connect a low impedance bypass with a minimum of 1 µF to AGND. The VDD voltage is also used for input feed-forward. VIN and VDD must be the same potential for accurate short circuit protection. VIN 21 Input power to the power stage. Low impedance bypassing of these pins to GND is critical. 22 23 24 25 VOUTS+ 31 Load voltage sensing, positive side. This sensing provides remote sensing for the PMBus interface reporting and the voltage control loop. VOUTS– 32 Load voltage sensing, negative or common side. This sensing provides remote sensing for the PMBus interface reporting and the voltage control loop. VSET 30 Optionally configures default output voltage setting by connecting a resistor from this pin to AGND. See Set Default Output Voltage by VSET for details. If VSET is not used, pull this pin up to BP3. Do not leave this pin floating. Thermal tab Package thermal tab. Connect to GND. The thermal tab must have adequate solder coverage for proper operation. |
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