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TPS62660 Datasheet(PDF) 8 Page - Texas Instruments |
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TPS62660 Datasheet(HTML) 8 Page - Texas Instruments |
8 / 27 page Gate Driver Anti Shoot-Through Power Save Mode Switching Logic + - Frequency Control FB R1 R2 SW GND Soft-Start EN VIN Current Limit Detect Undervoltage Lockout Bias Supply Bandgap Thermal Shutdown Negative Inductor Current Detect VIN MODE V = 0.8 V REF VREF Copyright © 2016, Texas Instruments Incorporated 8 TPS62660, TPS62665 SLVS871D – FEBRUARY 2010 – REVISED JUNE 2016 www.ti.com Product Folder Links: TPS62660 TPS62665 Submit Documentation Feedback Copyright © 2010–2016, Texas Instruments Incorporated 8 Detailed Description 8.1 Overview The TPS6266x is a synchronous step-down converter typically operates at a regulated 6-MHz frequency pulse width modulation (PWM) at moderate to heavy load currents. At light load currents, the TPS6266x converter operates in power-save mode with pulse frequency modulation (PFM). The converter uses 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 feedback loop. The loop response to change in VO is essentially instantaneous, which explains the transient response. The absence of a traditional, high-gain compensated linear loop means that the TPS6266x is inherently stable over a range of L and CO. 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 |
Similar Part No. - TPS62660_16 |
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Similar Description - TPS62660_16 |
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