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TPS61236 Datasheet(PDF) 16 Page - Texas Instruments

No. de Pieza. TPS61236
Descripción  TPS6123x 8-A Valley Current Synchronous Boost Converters with Constant Current Output Feature
Descarga  38 Pages
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Fabricante  TI1 [Texas Instruments]
Página de inicio  http://www.ti.com
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TPS61236 Datasheet(HTML) 16 Page - Texas Instruments

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SW
VIN
EN
VOUT
FB
CC
AGND
L1
1 PH
C1
10 PF
R1
1M
Ÿ
R2
332k
Ÿ
C2
22 PF x 3
OFF
ON
PGND
Li-Ion
Battery
VOUT
Up to 3.0 A at 5 V
TPS61236P
VDD
R4
1M
Ÿ
R3
41.2k
Ÿ
R5
1M
Ÿ
C3
10 nF
INACT
C4
1 PF
Copyright © 2016, Texas Instruments Incorporated
16
TPS61235P, TPS61236P
SLVSCK4A – SEPTEMBER 2015 – REVISED MAY 2016
www.ti.com
Product Folder Links: TPS61235P TPS61236P
Submit Documentation Feedback
Copyright © 2015–2016, Texas Instruments Incorporated
9 Applications and Implementation
NOTE
Information in the following applications sections is not part of the TI component
specification, and TI does not warrant its accuracy or completeness. TI’s customers are
responsible for determining suitability of components for their purposes. Customers should
validate and test their design implementation to confirm system functionality.
9.1 Application Information
The TPS6123x family is designed to operate from an input voltage supply range from 2.3-V to (VOUT – 0.6)-V,
and the maximum output voltage can be up to 5.5-V. The device operates in PWM mode under medium to heavy
load conditions and in power save mode under light load condition. In PWM mode, the TPS6123x converter
operates with 1-MHz switching frequency which provides a controlled frequency variation over the input voltage
range. As load current decreases, the converter enters PFM mode, reducing switching frequency and minimizing
IC quiescent current to achieve high efficiency over the entire load current range. The TPS6123x also supports a
constant current output feature to limit the maximum output current at a programmed value.
9.2 Typical Applications
9.2.1 TPS61236P 3-V to 4.35-V Input, 5-V Output Voltage, 3-A Maximum Output Current
This example illustrates how to use the TPS61236P to generate a 5-V output voltage from a Li-ion battery input
and how to use the CC function to limit maximum output current to 3-A for the entire input voltage range.
Figure 16. TPS61236P 5-V Output with 3-A Constant Output Current
9.2.1.1 Design Requirements
The design parameters for the TPS61236P 5-V 3-A constant output current design are listed in Table 1.
Table 1. TPS61236P 5-V 3-A Constant Output Current Design Parameters
DESIGN PARAMETERS
EXAMPLE VALUES
Input voltage range
3 V to 4.35 V
Output voltage
5 V
Output current limit
3 A
Operating frequency
1 MHz


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