TPS61251 Converter Datasheet

TPS61251 Datasheet, PDF, Equivalent


Part Number

TPS61251

Description

Boost Converter

Manufacture

etcTI

Total Page 30 Pages
Datasheet
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TPS61251
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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.

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


Features Product Folder Order Now Technical Doc uments Tools & Software Support & Com munity TPS61251 SLVSAF7C – SEPTEMBER 2010 – REVISED APRIL 2019 TPS61251 B oost Converter for Battery Backup Charg ing With Adjustable Constant Current an d Snooze Mode 1 Features •1 Resistor Programmable Input Current Limit – 10% Current accuracy at 500 mA over fu ll temperature range – Programmable f rom 100 mA up to 1500 mA • Snooze mod e draws only 2 μA (typical) quiescent current • Designed to charge large ca pacitor values in the Farad range • U p to 92% Efficiency • Power good indi cates 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 w hen VIN > VOUT • Load disconnect and reverse current protection • Short-ci rcuit protection • Typical operating frequency 3.5 MHz • Available in a 2 × 2-mm WSON-8 package • Create a cus tom design using the TPS61251 with the WEBENCH® Power Designer 2 Applications • Current limited app.
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