DescriptionThe TPS51221 is a dual synchronous buck regulator controller with 2 LDOs. It is optimized for 5V/3.3V system controller, enabling designers to cost effectively complete 2-cells to 4-cells notebook system power supply. TPS51221 supports high efficiency, fast transient response and 99% duty cycle operation. Typical applications include notebook computer system and I/O bus, point of load in LCD TV, MFP.
TPS51221 has sixteen features. (1)Input voltage range: 4.5V to 28V. (2)Output voltage range: 1V to 12V. (3)Selectable light load operation (continuous/ auto skip/ out-of-audio skip). (4)Programmable droop compensation. (5)Voltage servo adjustable soft start. (6)200kHz to 1MHz fixed frequency PWM. (7)Current mode architecture. (8)180° phase shift between channels. (9)Resistor or inductor DCR current sensing. (10)Powergood output for each channel. (11)OCL/ OVP/ UVP/ UVLO protections. (12)Current monitor output for CH1. (13)Thermal shutdown (non-latch). (14)Output discharge function (disable option). (15)Integrated boot strap MOSFET switch. (16)QFN32 (RTV). That are all the main features.
Some absolute maximum ratings of TPS51221 have been concluded into several points as follow. (1)Its input voltage range would be from -0.3V to 30V for VIN and would be from -0.3V to 35V for VBST1, VBST2 and would be from -2V to 30V for SW1, SW2 and would be from -1V to 13.5V for CSP1, CSP2, CSN1, CSN2 and would be from -0.3V to 7V for EN, EN1, EN2, VFB1, VFB2, TRIP, SKIPSEL1, SKIPSEL2. (2)Its output voltage range would be from -2V to 35V for DRVH1, DRVH2 and would be from -0.3V to 7V for DRVL1, DRVL2, COMP1, COMP2, VREG5, RF, VREF2, IMON1 PGOOD1, PGOOD2 and would be from -0.3V to 3.6V for VREG3. (3)Its operating junction temperature range would be from -40°C to 125°C. (4)Its storage temperature range would be from -55°C to 150°C. It should be noted that stresses above those listed in absolute maximum ratings may cause permanent damage to device. And so on. If you have any question or suggestion or want to know more information of TPS51221 please contact us for details. Thank you!
TPS51221 Data Sheet
