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TPS610993YFFR Datasheet(PDF) 8 Page - Texas Instruments

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No. de pieza TPS610993YFFR
Descripción Electrónicos  Synchronous Boost Converter with Ultra-Low Quiescent Current
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Fabricante Electrónico  TI1 [Texas Instruments]
Página de inicio  http://www.ti.com
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TPS610993YFFR Datasheet(HTML) 8 Page - Texas Instruments

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Current
Sense
Boost
Gate Driver
Pulse
Modulator
B2
B1
A1
Logic
Control
C1
REF
SW
EN
VOUT
VIN
Pass-Through
VPSTH
C2
TPS61099x
TPS61099
(1)
Thermal
Shutdown
OCP
UVLO
Down Mode
VDOWN
Startup
Protection
(OCP, OVP)
OVP
A2
FB
GND
Copyright © 2016, Texas Instruments Incorporated
8
TPS61099, TPS610994, TPS610997
SLVSD88C – JULY 2016 – REVISED JANUARY 2017
www.ti.com
Product Folder Links: TPS61099 TPS610994 TPS610997
Submit Documentation Feedback
Copyright © 2016–2017, Texas Instruments Incorporated
8 Detailed Description
8.1 Overview
The TPS61099x synchronous step-up converter is designed for alkaline battery, coin-cell battery, Li-ion or Li-
polymer battery powered systems, which requires long battery running time and tiny solution size. The
TPS61099x can operate with a wide input voltage from 0.7 V to 5.5 V. It only consumes 1 µA quiescent current
and can achieve high efficiency under light load condition.
The TPS61099x operates in a hysteretic control scheme with typical 1-A peak switch current limit. The
TPS61099x provides the true shutdown function and the load is completely disconnected from the input so as to
minimize the leakage current. It also adopts Down Mode and Pass-Through operation when input voltage is
close to or higher than the regulated output voltage. The TPS61099x family is available in both adjustable and
fixed output voltage versions. Adjustable version offers programmable output voltage for flexible applications
while fixed versions offer minimal solution size and achieve up to 75% high efficiency under 10-µA load.
8.2 Functional Block Diagrams
(1)
Internal FB resistor divider is implemented in fixed output voltage versions.
Figure 13. Functional Block Diagram
8.3 Feature Description
8.3.1
Boost Controller Operation
The TPS61099x boost converter is controlled by a hysteretic current mode controller. This controller regulates
the output voltage by keeping the inductor ripple current constant in the range of 300 mA and adjusting the offset
of this inductor current depending on the output load. Since the input voltage, output voltage and inductor value
all affect the rising and falling slopes of inductor ripple current, the switching frequency is not fixed and is
determined by the operation condition. If the required average input current is lower than the average inductor
current defined by this constant ripple, the inductor current goes discontinuously to keep the efficiency high under
light load condition. Figure 14 illustrates the hysteretic current operation. If the load current is reduced further, the


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