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TPS610997YFFR Fiches technique(PDF) 9 Page - Texas Instruments

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No de pièce TPS610997YFFR
Description  Synchronous Boost Converter with Ultra-Low Quiescent Current
Download  23 Pages
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Fabricant  TI1 [Texas Instruments]
Site Internet  http://www.ti.com
Logo TI1 - Texas Instruments

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Continuous Current Operation at
Heavy Load
Burst Mode Operation at
Light Load
Output Voltage of
Boost Converter
t
VOUT_NOM
VOUT_BST
Continuous Current Operation
300 mA
(typ.)
300 mA
(typ.)
Discontinuous Current Operation
IL
t
9
TPS61099, TPS610994, TPS610997
www.ti.com
SLVSD88C – JULY 2016 – REVISED JANUARY 2017
Product Folder Links: TPS61099 TPS610994 TPS610997
Submit Documentation Feedback
Copyright © 2016–2017, Texas Instruments Incorporated
Feature Description (continued)
boost converter enters into Burst mode. In Burst mode, the boost converter ramps up the output voltage with
several switching cycles. Once the output voltage exceeds a setting threshold, the device stops switching and
goes into a sleep status. In sleep status, the device consumes less quiescent current. It resumes switching when
the output voltage is below the setting threshold. It exits the Burst mode when the output current can no longer
be supported in this mode. Refer to Figure 15 for Burst mode operation details.
To achieve high efficiency, the power stage is realized as a synchronous boost topology. The output voltage
VOUT is monitored via an external or internal feedback network which is connected to the voltage error amplifier.
To regulate the output voltage, the voltage error amplifier compares this feedback voltage to the internal voltage
reference and adjusts the required offset of the inductor current accordingly.
Figure 14. Hysteretic Current Operation
Figure 15. Burst Mode Operation
8.3.2 Under-Voltage Lockout
An under-voltage lockout (UVLO) circuit stops the operation of the converter when the input voltage drops below
the typical UVLO threshold of 0.4 V. A hysteresis of 200 mV is added so that the device cannot be enabled again
until the input voltage goes up to 0.6 V. This function is implemented in order to prevent malfunctioning of the
device when the input voltage is between 0.4 V and 0.6 V.
8.3.3 Enable and Disable
When the input voltage is above UVLO rising threshold and the EN pin is pulled to high voltage, the TPS61099x
is enabled. When the EN pin is pulled to low voltage, the TPS61099x goes into shutdown mode. In shutdown
mode, the device stops switching and the rectifying PMOS fully turns off, providing the completed disconnection
between input and output. Less than 0.5-µA input current is consumed in shutdown mode.


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