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TPS62622 Datasheet(PDF) 7 Page - Texas Instruments

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No. de pieza TPS62622
Descripción Electrónicos  600-mA, 6-MHz High-Efficiency Step-Down Converter In Chip Scale Packaging
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Fabricante Electrónico  TI1 [Texas Instruments]
Página de inicio  http://www.ti.com
Logo TI1 - Texas Instruments

TPS62622 Datasheet(HTML) 7 Page - Texas Instruments

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background image
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
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