TPS51221RTVT

TPS51221 www.ti.com............................................................................................................................................... SLVS786A – NOVEMBER 2007 – REVISED MARCH 2009 Fixed Frequency, 99% Duty Cycle Peak Current Mode Notebook System Power Controller FEATURES APPLICATIONS • Input Voltage Range: 4.5 V to 28 V • Output Voltage Range: 1 V to 12 V • Selectable Light Load Operation (Continuous / Auto Skip / Out-Of-Audio™ Skip) • Programmable Droop Compensation • Voltage Servo Adjustable Soft Start • 200 kHz to 1 MHz Fixed Frequency PWM • Current Mode Architecture • 180° Phase Shift Between Channels • Resistor or Inductor DCR Current Sensing • Powergood Output for each channel • OCL/OVP/UVP/UVLO protections • Current Monitor Output for CH1 • Thermal Shutdown (Non-latch) • Output Discharge Function (Disable option) • Integrated Boot Strap MOSFET Switch • QFN32 (RTV) • • 1 2 Notebook Computer System and I/O Bus Point of load in LCD TV, MFP DESCRIPTION The TPS51221 is a dual synchronous buck regulator controller with 2 LDOs. It is optimized for 5-V/3.3-V system controller, enabling designers to cost effectively complete 2-cell to 4-cell notebook system power supply. The TPS51221 supports high efficiency, fast transient response and 99% duty cycle operation. It supports supply input voltage ranging from 4.5 V to 28 V, and output voltages from 1 V to 12 V. Peak current mode supports stability operation with lower ESR capacitor and output accuracy. The high duty (99%) operation and wide input/ output voltage range supports flexible design for small mobile PCs and a wide variety of other applications. The fixed frequency can be adjusted from 200 kHz to 1MHz by a resistor, and each channel runs 180° out of phase. The TPS51221 can also synchronize to the external clock, and the interleaving ratio can be adjusted by its duty. The TPS51221 is available in the 32-pin 5×5 QFN package and is specified from –40°C to 85°C. TYPICAL APPLICATION CIRCUIT VBAT C01 C14 PGND C24 Q12 VO1 2 V5SW 3 RF 4 EN1 5 PGOOD1 6 SKIPSEL1 29 28 27 26 GND VBST2 DRVH1 30 DRVL2 31 DRVL1 1 32 L2 C21 Q22 VREG5 PGND PGND SW1 C11 C22 PGND GND PGND PGND VBST1 VO1 5.0V VBAT Q21 PGND DRVH2 PGND 24 VIN 23 VBAT R01 VREG3 22 C03 GND EN1 PGOOD1 SKIPSEL1 PGOOD2 R24 VREF2 TRIP COMP2 10 11 12 13 14 15 C23 CSN2 17 VFB2 EN 9 IMON1 GND 16 VREG5 IMON1 R21 R23 VO1 C04 GND SKIPSEL2 CSP2 18 CSN1 COMP1 8 EN PGOOD2 20 SKIPSEL2 19 CSP1 VFB1 7 C13 VREG3 3.3V/10mA EN2 PowerPAD R14 R02 EN2 21 TPS51221RTV (QFN32) VO2 3.3V 25 SW2 L1 VREG5 5V/100mA Q11 C12 VO2 R11 R12 R22 C02 R13 GND GND GND GND 1 2 Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet. Out-Of-Audio, PowerPAD are trademarks of Texas Instruments. PRODUCTION DATA information is current as of publication date. Products conform to specifications per the terms of the Texas Instruments standard warranty. Production processing does not necessarily include testing of all parameters. Copyright © 2007–2009, Texas Instruments Incorporated TPS51221 SLVS786A – NOVEMBER 2007 – REVISED MARCH 2009............................................................................................................................................... www.ti.com FUNCTIONAL BLOCK DIAGRAM VIN EN V5SW 4.7V/ 4.5V + + 1.25V + + VREG5 4.7V/ 4.5V VREG3 GND V5OK + 4.2V/ 3.8V Ready GND + THOK 150/ 140 Deg-C VREF2 1.25V GND GND CLK2 OSC RF CLK1 GND 1V +5%/ 10% + PGOOD1 Delay + 1V - 5%/ 10% + 1V -30% GND UVP CLK1 Ready Fault2 OVP + SDN2 1V +15% Fault1 COMP1 Ramp Comp SDN1 + + PWM VFB1 VREG5 EN1 IMON1 1V + Enable/ Soft-start + Filter VFB-AMP VREF2 VBST1 Amp. Ramp Comp + Skip Control Logic DRVH1 (CH1 only) CS-AMP CSN1 SW1 + OCP + CSP1 XCON VREG5 100mV DRVL1 TRIP Discharge Control GND GND 100mV VREF2 N-OCP + GND OOA Ctrl GND SKIPSEL1 Channel-1 Switcher shown 2 Submit Documentation Feedback Copyright © 2007–2009, Texas Instruments Incorporated Product Folder Link(s): TPS51221 TPS51221 www.ti.com............................................................................................................................................... SLVS786A – NOVEMBER 2007 – REVISED MARCH 2009 ORDERING INFORMATION (1) TA PACKAGE ORDERABLE PART NUMBER –40°C to 85°C PLASTIC QUAD FLAT PACK (QFN) TPS51221RTVR (1) TPS51221RTVT 32 MINIMUM ORDER QUANTITY OUTPUT SUPPLY PINS Tape and reel 250 Tape and reel 3000 ECO PLAN Green (RoHS and no Sb/Br) For the most current package and ordering information, see the Package Option Addendum at the end of this document, or see the TI website at www.ti.com. ABSOLUTE MAXIMUM RATINGS (1) over operating free-air temperature range (unless otherwise noted) VALUE UNIT VIN –0.3 to 30 V VBST1, VBST2 –0.3 to 35 V –0.3 to 7 V –5 to 30 V CSP1, CSP2, CSN1, CSN2 –1 to 13.5 V EN, EN1, EN2, VFB1, VFB2, TRIP, SKIPSEL1, SKIPSEL2 VBST1, VBST2 Input voltage range (3) SW1, SW2 (2) –0.3 to 7 V V5SW –1 to 7 V V5SW (to VREG5) (4) –7 to 7 V DRVH1, DRVH2 –5 to 35 V DRVH1, DRVH2 –0.3 to 7 V DRVL1, DRVL2, COMP1, COMP2, VREG5, RF, VREF2, IMON1 PGOOD1, PGOOD2 –0.3 to 7 V (3) Output voltage range (2) –0.3 to 3.6 V Operating junction temperature range, TJ VREG3 –40 to 125 °C Storage temperature, Tst –55 to 150 °C (1) (2) (3) (4) Stresses beyond those listed under absolute maximum ratings may cause permanent damage to the device. These are stress ratings only and functional operation of the device at these or any other conditions beyond those indicated under recommended operating conditions is not implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability. All voltage values are with respect to the network ground terminal unless otherwise noted. Voltage values are with respect to the corresponding SW terminal. When EN is high and V5SW is grounded, or voltage is applied to V5SW when EN is low. DISSIPATION RATINGS (2 oz Trace and Copper Pad with Solder) PACKAGE TA < 25°C POWER RATING DERATING FACTOR ABOVE TA = 25°C TA = 85°C POWER RATING 32 pin RTV 1.7 W 17 mW/°C 0.7 W Submit Documentation Feedback Copyright © 2007–2009, Texas Instruments Incorporated Product Folder Link(s): TPS51221 3 TPS51221 SLVS786A – NOVEMBER 2007 – REVISED MARCH 2009............................................................................................................................................... www.ti.com RECOMMENDED OPERATING CONDITIONS MIN Supply voltage I/O voltage VIN MAX 4.5 28 V5SW –0.8 6 VBST1, VBST2 –0.1 33 DRVH1, DRVH2 –4.0 33 DRVH1, DRVH2 (wrt SW1, 2) –0.1 6 SW1, SW2 –4.0 28 CSP1, CSP2, CSN1, CSN2 –0.8 13 EN, EN1, EN2, VFB1, VFB2, TRIP, DRVL1, DRVL2, COMP1, COMP2, VREG5, RF, VREF2, PGOOD1, PGOOD2, SKIPSEL1, SKIPSEL2, IMON1 –0.1 6 VREG3 –0.1 3.5 –40 85 Operating free-air temperature, TA 4 TYP Submit Documentation Feedback UNIT V V °C Copyright © 2007–2009, Texas Instruments Incorporated Product Folder Link(s): TPS51221 TPS51221 www.ti.com............................................................................................................................................... SLVS786A – NOVEMBER 2007 – REVISED MARCH 2009 ELECTRICAL CHARACTERISTICS over operating free-air temperature range, EN=3.3V, VIN=12V, V5SW=5V (unless otherwise noted) PARAMETER TEST CONDITIONS MIN TYP MAX UNIT 7 15 µA 80 120 µA SUPPLY CURRENT IVINSDN VIN shutdown current VIN shutdown current, TA = 25°C, No Load, EN = 0V, V5SW = 0 V IVINSTBY1 VIN standby current 1 VIN standby current, TA = 25°C, No Load, EN1=EN2=V5SW = 0 V IVBATSTBY Vbat standby current Vbat standby current, TA = 25°C, No Load SKIPSEL2=2V, EN2=open, EN1=V5SW=0V (1) IV5SW V5SW supply current V5SW current, TA = 25°C, No Load, ENx=5V, VFBx=1.05 V 500 µA TRIP = 5 V 1.2 mA TRIP = 0 V 1.4 mA VREF2 OUTPUT VVREF2 VREF2 output voltage IVREF2 < ±10 µA, TA = 25°C 1.98 2.00 2.02 IVREF2 < ±100 µA, 4.5V < VIN < 25 V 1.97 2.00 2.03 V VREG3 OUTPUT V5SW = 0 V, IVREG3 = 0 mA, TA = 25°C 3.279 3.313 3.347 VVREG3 VREG3 output voltage V5SW = 0 V, 0 mA < IVREG3