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TPS53311 Datasheet(PDF) 11 Page - Texas Instruments |
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TPS53311 Datasheet(HTML) 11 Page - Texas Instruments |
11 / 22 page 12 11 2 VDD AGND SYNC TPS53311 UDG-10029 1 8 EN PS 4 3 VBST PGD 10 FB L1 1 mH 9 COMP 15 PGND 16 PGND 13 VIN 14 VIN 6 7 5 SW SW SW EN SYNC C8 1 mF R6 2.2 W C6 0.1 mF V IN C2 22 nF R4 4.02 kW C3 100 pF C1 2.2 nF R3 20 W PGD R5 57.6 kW C4 0.1 mF V IN Output all MLCCs C5 22 mF C OUT 3 x 22 mF R1 4.02 kW R2 4.02 kW R7 20 kW TPS53311 www.ti.com SLUSA41 – JUNE 2010 APPLICATION INFORMATION APPLICATION CIRCUIT DIAGRAM Figure 13. Typical 3.3-V input Application Circuit Diagram OVERVIEW The TPS53311 is a high-efficiency switching regulator with two integrated N-channel MOSFETs and is capable of delivering up to 3 A of load current. The TPS53311 provides output voltage between 0.6 V and 0.84 × VIN from 2.9 V to 6.0 V wide input voltage range. This device employs five operation modes to fit various application needs. The master/slave mode enables a two-phase interleaved operation to reduce input ripple. The skip mode operation provides reduced power loss and increases the efficiency at light load. The unique, patented PWM modulator enables smooth light load to heavy load transition while maintaining fast load transient. OPERATION MODE The TPS53311 offers five operation modes determined by the PS pin connections listed in Table 1. Table 1. Operation Mode Selection PS PIN CONNECTION OPERATION MODE AUTO-SKIP AT LIGHT LOAD MASTER/SLAVE SUPPORT GND FCCM Slave Slave 24.3 k Ω to GND DE Slave √ Slave 57.6 k Ω to GND HEF Mode √ 174 k Ω to GND DE Master √ Master Floating or pulled to VDD FCCM Master Master In forced continuous conduction mode (FCCM), the high-side FET is ON during the on-time and the low-side FET is ON during the off-time. The switching is synchronized to the internal clock thus the switching frequency is fixed. In diode emulation mode (DE), the high-side FET is ON during the on-time and low-side FET is ON during the off-time until the inductor current reaches zero. An internal zero-crossing comparator detects the zero crossing of inductor current from positive to negative. When the inductor current reaches zero, the comparator sends a signal to the logic control and turns off the low-side FET. Copyright © 2010, Texas Instruments Incorporated Submit Documentation Feedback 11 Product Folder Link(s) :TPS53311 |
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