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TPS62622 Datasheet(PDF) 7 Page - Texas Instruments |
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TPS62622 Datasheet(HTML) 7 Page - Texas Instruments |
7 / 28 page GateDriver Anti Shoot-Through PowerSaveMode SwitchingLogic + - Frequency Control FB R1 R2 SW GND Soft-Start EN VIN CurrentLimit Detect Undervoltage Lockout BiasSupply Bandgap Thermal Shutdown NegativeInductor CurrentDetect VIN MODE V = 0.8 V REF VREF TPS62620, TPS62621, TPS62622 TPS62623, TPS62624, TPS62625 www.ti.com SLVS848D – JULY 2009 – REVISED OCTOBER 2015 8 Detailed Description 8.1 Overview The TPS6262x synchronous step-down DC/DC converters typically operate at a regulated 6-MHz frequency pulse width modulation (PWM) mode at moderate to heavy load currents. At light load currents, the TPS6262x converters operate in power-save mode with pulse frequency modulation (PFM). The converters use a unique frequency locked ring oscillating modulator to achieve best-in-class load and line response and allows the use of tiny inductors and small ceramic input and output capacitors. At the beginning of each switching cycle, the P-channel MOSFET switch is turned on and the inductor current ramps up rising the output voltage until the main comparator trips, then the control logic turns off the switch. One key advantage of the non-linear architecture is that there is no traditional feed-back loop. The loop response to change in VOUT is essentially instantaneous, which explains the transient response. The absence of a traditional, high-gain compensated linear loop means that the TPS6262x converters are inherently stable over a range of L and COUT. Although this type of operation normally results in a switching frequency that varies with input voltage and load current, an internal frequency lock loop (FLL) holds the switching frequency constant over a large range of operating conditions. Combined with best in class load and line transient response characteristics, the low quiescent current of the device (ca. 31 μA) allows to maintain high efficiency at light load, while preserving fast transient response for applications requiring tight output regulation. 8.2 Functional Block Diagram Copyright © 2009–2015, Texas Instruments Incorporated Submit Documentation Feedback 7 |
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