Texas Instruments TPS54810 manuale d’uso

TPS54810 SL VS420B − MARCH 2002 − R EVISED FEBRUAR Y 2005 4-V TO 6-V INPUT , 8-A OUTPUT SYNCHRONOUS BUCK PWM SWITCHER WITH INTEGRA TED FETS (SWIFT ™ ) 6,4 mm X 9,7 mm FEA TURES D 30-m Ω MOSFET Switches for High Efficiency at 8-A Continuous Output D 0.9-V to 3.3-V Adjustable Output V oltage Range With 1% Accuracy D Externally Compensated D F[...]

TPS54810 SL VS420B − MARCH 2002 − R EVISED FEBRUAR Y 2005 www.ti.com 2 These devices have limited built-in ESD protection. The leads should be shorted together or the device placed in conductive foam during storage or handling to prevent electrostatic damage to the MOS gates. ORDERING INFORMA TION T A OUTPUT VOL T AGE P ACKAGE P ART NUMBER − [...]

TPS54810 SL VS420B − MARCH 2002 − R EVISED FEBRUARY 2005 www.ti.com 3 ELECTRICAL CHARACTERISTICS T J = − 40 ° C to 125 ° C, V I = 4 V to 6 V unless otherwise noted P ARAMETER TEST CONDITIONS MIN TYP MAX UNIT SUPPL Y VOL T AGE, VIN Input voltage range, VIN 4.0 6.0 V f s = 350 kHz, SYNC ≤ 0.8 V , RT open, PH pin open 11 15.8 I (Q) Quiescent[...]

TPS54810 SL VS420B − MARCH 2002 − R EVISED FEBRUAR Y 2005 www.ti.com 4 ELECTRICAL CHARACTERISTICS CONTINUED T J = − 40 ° C to 125 ° C, V I = 4 V to 6 V unless otherwise noted P ARAMETER TEST CONDITIONS MIN TYP MAX UNIT ERROR AMPLIFIER Error amplifier open loop voltage gain 1 k Ω COMP to AGND (1) 90 11 0 dB Error amplifier unity gain bandw[...]

TPS54810 SL VS420B − MARCH 2002 − R EVISED FEBRUAR Y 2005 www.ti.com 5 1 2 3 4 5 6 7 8 9 10 11 12 13 14 28 27 26 25 24 23 22 21 20 19 18 17 16 15 AGND VSENSE COMP PWRGD BOOT PH PH PH PH PH PH PH PH PH RT SYNC SS/ENA VBIAS VIN VIN VIN VIN VIN PGND PGND PGND PGND PGND PWP P ACKAGE (TOP VIEW) THERMAL PA D T erminal Functions TERMINAL DESCRIPTION N[...]

TPS54810 SL VS420B − MARCH 2002 − R EVISED FEBRUARY 2005 www.ti.com 6 FUNCTIONAL BLOCK DIAGRAM Falling Edge Deglitch Enable Comparator 1.2 V VIN 3.8 V Hysteresis: 0.03 V 2.5 µ s Falling and Rising Edge Deglitch 2.5 µ s VIN UVLO Comparator Hysteresis: 0.16 V Internal/External Slow-Start (Internal Slow-Start T ime = 3.35 ms) Reference VREF = 0.[...]

TPS54810 SL VS420B − MARCH 2002 − R EVISED FEBRUARY 2005 www.ti.com 7 TYPICAL CHARACTERISTICS Figure 1 0 10 20 30 40 50 60 − 40 − 15 10 35 60 85 1 10 135 V I = 5 V , I O = 8 A DRAIN-SOURCE ON-ST A TE RESIST ANCE vs JUNCTION TEMPERA TURE T J − Junction T emperature − ° C Drain Source On-State Reststance − m Ω Figure 2 250 350 450 55[...]

TPS54810 SL VS420B − MARCH 2002 − R EVISED FEBRUARY 2005 www.ti.com 8 APPLICA TION INFORMA TION Figure 9 shows the schematic diagram for a typical TPS54810 application. The TPS54810 (U1) can provide up to 8 A of output current at a nominal output voltage of 1.8 V . For proper thermal performance, the PowerP AD underneath the integrated circuit [...]

TPS54810 SL VS420B − MARCH 2002 − R EVISED FEBRUARY 2005 www.ti.com 9 PCB LA YOUT Figure 10 shows a generalized PCB layout guide for the TPS54810 Th e VIN pins are connected together on the printed-circuit board (PCB) and bypassed with a low-ESR ceramic-bypass capacitor . Care should be taken to minimize the loop area formed by the bypass capac[...]

TPS54810 SL VS420B − MARCH 2002 − R EVISED FEBRUARY 2005 www.ti.com 10 AGND BOOT VSENSE COMP PWRGD PH PH PH PH PH PH PH PH PH RT SYNC SS/ENA VBIAS VIN VIN VIN VIN VIN PGND PGND PGND PGND PGND VOUT PH VIN TOPSIDE GROUND AREA V IA to Ground Plane ANALOG GROUND TRACE EXPOSED POWERP AD AREA COMPENSA TION NETWORK OUTPUT INDUCTO R OUTPUT FILTER CAPAC[...]

TPS54810 SL VS420B − MARCH 2002 − R EVISED FEBRUARY 2005 www.ti.com 11 LA YOUT CONSIDERA TIONS FOR THERMAL PERFORMANCE For operation at full rated load current, the analog ground plane must provide adequate heat dissipating area. A 3 inch by 3 inch plane of 1 ounce copper is recommended, though not mandatory , depending on ambient temperature a[...]

TPS54810 SL VS420B − MARCH 2002 − R EVISED FEBRUARY 2005 www.ti.com 12 PERFORMANCE GRAPHS (FROM APPLICA TION CIRCUIT SHOWN IN FIGURE 9) Fi g ure 12 I O − Output Current − A Efficiency − % EFFICIENCY vs OUTPUT CURRENT 50 55 60 65 70 75 80 85 90 95 100 0246 8 1 0 V I = 5 V V O = 1.8 V f s = 700 kHz Figure 13 0.997 0.998 0.999 1 1.001 1.002 [...]

TPS54810 SL VS420B − MARCH 2002 − R EVISED FEBRUARY 2005 www.ti.com 13 DET AILED DESCRIPTION Under V oltage Lock Out (UVLO) The TPS54810 incorporates an under voltage lockout circuit to keep the device disabled when the input voltage (VIN) is insufficient. During power up, internal circuits are held inactive until VIN exceeds the nominal UVLO t[...]

TPS54810 SL VS420B − MARCH 2002 − R EVISED FEBRUARY 2005 www.ti.com 14 particular application needs. T ype 2 or type 3 compensa- tion can be employed using external compensation components. PWM Control Signals from the error amplifier output, oscillator , and current limit circuit are processed by the PWM control logic. Referring to the interna[...]

PACKAGING INFORMATION Orderable Device Status (1) Package Type Package Drawing Pins Package Qty Eco Plan (2) Lead/Ball Finish MSL Peak Temp (3) TPS54810PWP ACTIVE HTSSOP PWP 28 50 Green (RoHS & no Sb/Br) CU NIPDAU Level-2-260C-1 YEAR TPS54810PWPG4 ACTIVE HTSSOP PWP 28 50 Green (RoHS & no Sb/Br) CU NIPDAU Level-2-260C-1 YEAR TPS54810PWPR ACT[...]

TAPE AND REEL INFORMATION *All dimensions are nominal Device Package Type Package Drawing Pins SPQ Reel Diameter (mm) Reel Width W1 (mm) A0 (mm) B0 (mm) K0 (mm) P1 (mm) W (mm) Pin1 Quadrant TPS54810PWPR HTSSOP PWP 28 2000 330.0 16.4 6.9 10.2 1.8 12.0 16.0 Q1 PACKAGE MATERIALS INFORMATION www.ti.com 11-Mar-2008 Pack Materials-Page 1[...]

*All dimensions are nominal Device Package Type Package Drawing Pins SPQ Length (mm) Width (mm) Height (mm) TPS54810PWPR HTSSOP PWP 28 2000 346.0 346.0 33.0 PACKAGE MATERIALS INFORMATION www.ti.com 11-Mar-2008 Pack Materials-Page 2[...]

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