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TPS61220 Datasheet(PDF) 11 Page - Texas Instruments

Part # TPS61220
Description  TPS6122x Low Input Voltage, 0.7V Boost Converter With 5.5關A Quiescent Current
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Manufacturer  TI [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI - Texas Instruments

TPS61220 Datasheet(HTML) 11 Page - Texas Instruments

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background image
I
L
t
200mA
(typ.)
ContinuousCurrentOperation
DiscontinuousCurrentOperation
200mA
(typ.)
Current
Sensor
Gate
Driver
Device
Control
GND
EN
FB
VOUT
L
VREF
VIN
Device
Control
StartUp
VIN
VOUT
Current
Sensor
Gate
Driver
Device
Control
GND
EN
FB
VOUT
L
VREF
VIN
Device
Control
StartUp
VIN
VOUT
TPS61220, TPS61221, TPS61222
www.ti.com
SLVS776B – JANUARY 2009 – REVISED NOVEMBER 2014
10 Detailed Description
10.1 Overview
The TPS6122x is a high performance, high efficient family of switching boost converters. To achieve high
efficiency, the power stage is realized as a synchronous-boost topology. For the power switching, two actively-
controlled low-RDSon power MOSFETs are implemented.
10.2 Functional Block Diagrams
Figure 23. Functional Block Diagram (Adjustable
Figure 24. Functional Block Diagram (Fixed Output
Version)
Voltage Version)
10.3 Feature Description
10.3.1
Controller Circuit
The device 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 200 mA and adjusting the offset of this inductor
current depending on the output load. If the required average input current is lower than the average inductor
current defined by this constant ripple current, the inductor current becomes discontinuous to keep the efficiency
high under low-load conditions.
Figure 25. Hysteretic Current Operation
The output voltage VOUT is monitored via the 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. In fixed output voltage devices, an
internal feedback network is used to program the output voltage. In adjustable versions an external resistor
divider is required.
The self-oscillating hysteretic current mode architecture is inherently stable and allows fast response to load
variations. This architecture also allows using a wide range of inductor and capacitor values.
Copyright © 2009–2014, Texas Instruments Incorporated
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Product Folder Links: TPS61220 TPS61221 TPS61222


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