Boost Converter. TPS61251 Datasheet

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TPS61251 Datasheet
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Part TPS61251
Description Boost Converter
Feature TPS61251; Product Folder Order Now Technical Documents Tools & Software Support & Community TPS61251 SLVS.
Manufacture etcTI
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Texas Instruments TPS61251
Product
Folder
Order
Now
Technical
Documents
Tools &
Software
Support &
Community
TPS61251
SLVSAF7C – SEPTEMBER 2010 – REVISED APRIL 2019
TPS61251 Boost Converter for Battery Backup Charging With Adjustable Constant
Current and Snooze Mode
1 Features
1 Resistor Programmable Input Current Limit
– ±10% Current accuracy at 500 mA over full
temperature range
– Programmable from 100 mA up to 1500 mA
• Snooze mode draws only 2 μA (typical) quiescent
current
• Designed to charge large capacitor values in the
Farad range
• Up to 92% Efficiency
• Power good indicates appropriate output voltage
level even in shutdown
• VIN range from 2.3 V to 6 V
• Adjustable output voltage up to 6.5 V
• 100% Duty-cycle mode when VIN > VOUT
• Load disconnect and reverse current protection
• Short-circuit protection
• Typical operating frequency 3.5 MHz
• Available in a 2 × 2-mm WSON-8 package
• Create a custom design using the TPS61251 with
the WEBENCH® Power Designer
2 Applications
• Current limited applications with high peak power
loads (SSD, PCMCIA Tx bursts, memory,
GPRS/GSM Tx)
• Li-Ion applications
• Battery backup applications
• Audio applications
• RF-PA buffer
3 Description
The TPS61251 device provides a power supply
solution for products powered by either a three-cell,
NiCd or NiMH battery, or a one-cell Li-Ion or Li-
polymer battery. The wide input voltage range is ideal
to power portable applications like mobile phones,
solid state drives (SSD) and wireless modems. The
converter is designed to charge large capacitors in
the Farad range to support battery back up
applications. During capacitor charging, the
TPS61251 device is working as a constant current
source until VOUT has reached its programmed value.
The charge current can be programmed by an
external resistor RILIM and provides a ±10% accuracy
for the 500-mA average input current limit.
Device Information(1)
PART NUMBER
PACKAGE
BODY SIZE (NOM)
TPS61251
WSON (8)
2.00 mm × 2.00 mm
(1) For all available packages, see the orderable addendum at
the end of the data sheet.
VIN
2.3 V to
6.0 V
L1
1 μH
C1
10 µF
RILIM
20 kΩ
Simplified Schematic
L VOUT
VIN
EN FB
ILIM
R1
1 MΩ
R2
280 kΩ
CFF
1 nF
R4
1 MΩ
COUT
4.7 µF
VOUT
5.5 V
CBULK
>150 µF
GND
PG
TPS61251
Power Good
Output
1
An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,
intellectual property matters and other important disclaimers. PRODUCTION DATA.



Texas Instruments TPS61251
TPS61251
SLVSAF7C – SEPTEMBER 2010 – REVISED APRIL 2019
www.ti.com
Table of Contents
1 Features .................................................................. 1
2 Applications ........................................................... 1
3 Description ............................................................. 1
4 Revision History..................................................... 2
5 Description (Continued) ........................................ 3
6 Device Options....................................................... 3
7 Pin Configuration and Functions ......................... 4
8 Specifications......................................................... 5
8.1 Absolute Maximum Ratings ...................................... 5
8.2 ESD Ratings.............................................................. 5
8.3 Recommended Operating Conditions....................... 5
8.4 Thermal Information .................................................. 5
8.5 Electrical Characteristics........................................... 6
8.6 Typical Characteristics .............................................. 6
9 Detailed Description .............................................. 8
9.1 Overview ................................................................... 8
9.2 Functional Block Diagram ......................................... 9
9.3 Feature Description................................................... 9
9.4 Device Functional Modes........................................ 11
10 Application and Implementation........................ 12
10.1 Application Information.......................................... 12
10.2 Typical Application ............................................... 12
11 Power Supply Recommendations ..................... 18
12 Layout................................................................... 18
12.1 Layout Guidelines ................................................. 18
12.2 Layout Example .................................................... 18
12.3 Thermal Consideration.......................................... 19
13 Device and Documentation Support ................. 20
13.1 Device Support...................................................... 20
13.2 Development Support ........................................... 20
13.3 Receiving Notification of Documentation Updates 20
13.4 Community Resource............................................ 20
13.5 Trademarks ........................................................... 20
13.6 Electrostatic Discharge Caution ............................ 20
13.7 Glossary ................................................................ 21
14 Mechanical, Packaging, and Orderable
Information ........................................................... 21
4 Revision History
Changes from Revision B (July 2015) to Revision C
Page
• Added "±10% accuracy for the 500-mA average input current limit" to Features and Description ........................................ 1
• Added links for Webench ....................................................................................................................................................... 1
• Added Receiving Notification of Documentation Updates ................................................................................................... 20
Changes from Revision A (May 2015) to Revision B
Page
• Deleted package suffix from device number in the Device Options table. ............................................................................ 3
Changes from Original (September 2010) to Revision A
Page
• Added ESD Ratings table, Feature Description section, Device Functional Modes, Application and Implementation
section, Power Supply Recommendations section, Layout section, Device and Documentation Support section, and
Mechanical, Packaging, and Orderable Information section ................................................................................................. 1
2 Submit Documentation Feedback
Product Folder Links: TPS61251
Copyright © 2010–2019, Texas Instruments Incorporated



Texas Instruments TPS61251
www.ti.com
TPS61251
SLVSAF7C – SEPTEMBER 2010 – REVISED APRIL 2019
5 Description (Continued)
The TPS61251 device in combination with a reservoir capacitor allows the converter to provide high current
pules that would exceed the capability of the suppling circuit (PC slot, USB) and keeps the slot power safely
within its capabilities. During light loads the device automatically enters an enhanced power save mode (snooze
mode), which allows the converter to maintain the required output voltage, while only drawing 2 μA from the
battery. This allows maximum efficiency at lowest quiescent currents.
TPS61251 device allows the use of small inductors and input capacitors to achieve a small solution size. During
shutdown, the load is completely disconnected from the battery and will not discharge either the battery nor the
charged bulk capacitor. The TPS61251 device is available in a 8-pin QFN package measuring 2 × 2 mm (DSG).
6 Device Options
OUTPUT VOLTAGE(1)
Adjustable
PART NUMBER(2)
TPS61251
(1) Contact TI for other fixed output voltage options
(2) For detailed ordering information check the Mechanical, Packaging,
and Orderable Information section at the end of this data sheet.
Copyright © 2010–2019, Texas Instruments Incorporated
Product Folder Links: TPS61251
Submit Documentation Feedback
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