Boost Converter. TPS61291 Datasheet

TPS61291 Converter. Datasheet pdf. Equivalent

TPS61291 Datasheet
Recommendation TPS61291 Datasheet
Part TPS61291
Description Low Iq Boost Converter
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Texas Instruments TPS61291
Product
Folder
Sample &
Buy
Technical
Documents
Tools &
Software
Support &
Community
TPS61291
SLVSBX9A – SEPTEMBER 2014 – REVISED SEPTEMBER 2014
TPS61291 Low Iq Boost Converter with Bypass Operation
1 Features
1 Input Voltage Range 0.9V to 5V
• Startup Voltage 1.5V at 20mA Load
• Pin Selectable Output Voltages: 3.3V, 3V, 2.5V
• 15nA typical Quiescent Current in Bypass Mode
• 5.7μA typical Quiescent Current in Boost Mode
• Bypass Switch from VIN to VOUT
• IOUT > 200mA at 3.3V VOUT, VIN = 1.8V
• Internal Feedback Divider Disconnect (Bypass
Mode)
• Controlled Bypass Transition Prevents Reverse
Current into Battery
• Power-Save Mode at Light Loads
• Overtemperature Protection
• Redundant Overvoltage Protection
• Small 2mm x 2mm SON 6-pin package
2 Applications
• Metering (Gas, Water, Smart Meters)
• Remote Controls
• Home Security / Home Automation
• Single 3V Li-MnO2 or 2 x 1.5V Alkaline Cell
Powered Applications
3 Description
The TPS61291 is a boost converter with pin
selectable output voltages and an integrated bypass
mode. In bypass operation, the device provides a
direct path from the input to the system and allows a
low power micro controller (MCU) such as the
MSP430 to operate directly from a single 3V Li-MnO2
battery or dual alkaline battery cells.
In bypass mode the integrated feedback divider
network for boost mode operation is disconnected
from the output and the quiescent current
consumption drops down to only 15nA (typical).
In boost mode the device provides a minimum output
current of 200mA at 3.3V VOUT from 1.8V VIN. The
boost mode is used for system components which
require a regulated supply voltage and cannot directly
operate from the input source. The boost converter is
based on a current-mode controller using
synchronous rectification to obtain maximum
efficiency and consumes typically 5.7uA from the
output. During startup of the boost converter, the
VSEL pin is read out and the integrated feedback
network sets the output voltage to 2.5V, 3V or 3.3V.
Bypass mode or boost mode operation is controlled
by the system via the EN/BYP pin.
The device integrates an enhanced bypass mode
control to prevent charge, stored in the output
capacitor during boost mode operation, from flowing
back to the input and charging the battery.
The device is packaged in a small 6-pin SON
package (DRV) measuring 2.0mm × 2.0mm x
0.75mm.
Device Information(1)
PART NUMBER
PACKAGE
BODY SIZE (NOM)
TPS61291
SON (6)
2.00 mm x 2.00 mm
(1) For all available packages, see the orderable addendum at
the end of the datasheet.
Simplified Schematic and Efficiency Curves
TPS61291
L = 3.3mH
2 x 1.5V Alkaline /
1 x 3V Li-MnO2
+
-+
+
-
-
VBAT
CIN
10mF
SW Step up
VOUT =
converter VOUT VBAT / 3.3V
VIN
Bypass
VSEL
COUT
22mF
GND
EN/BYP
Subsystem
VCC = 3.3V
MCU
(VCC = VBAT or 3.3V)
100
95
90
85
80
75
70
65
60
55
50
0.01
VIN = 1.2V
VIN = 1.8V
VIN = 2.5V
VIN = 3.0V
0.1 1 10 100
Output Current IOUT [mA]
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 TPS61291
TPS61291
SLVSBX9A – SEPTEMBER 2014 – REVISED SEPTEMBER 2014
www.ti.com
Table of Contents
1 Features .................................................................. 1
2 Applications ........................................................... 1
3 Description ............................................................. 1
4 Revision History..................................................... 2
5 Pin Configuration and Functions ......................... 3
6 Specifications......................................................... 4
6.1 Absolute Maximum Ratings ...................................... 4
6.2 Handling Ratings....................................................... 4
6.3 Recommended Operating Conditions....................... 4
6.4 Thermal Information ................................................. 4
6.5 Electrical Characteristics........................................... 5
6.6 Typical Characteristics .............................................. 6
7 Detailed Description .............................................. 7
7.1 Overview ................................................................... 7
7.2 Functional Block Diagram ......................................... 7
7.3 Feature Description................................................... 7
7.4 Device Functional Modes.......................................... 8
8 Applications and Implementation ...................... 10
8.1 Application Information............................................ 10
8.2 Typical Application .................................................. 10
9 Power Supply Recommendations...................... 16
10 Layout................................................................... 16
10.1 Layout Guidelines ................................................. 16
10.2 Layout Example .................................................... 16
11 Device and Documentation Support ................. 17
11.1 Device Support .................................................... 17
11.2 Documentation Support ........................................ 17
11.3 Trademarks ........................................................... 17
11.4 Electrostatic Discharge Caution ............................ 17
11.5 Glossary ................................................................ 17
12 Mechanical, Packaging, and Orderable
Information ........................................................... 17
4 Revision History
NOTE: Page numbers for previous revisions may differ from page numbers in the current version.
Changes from Original (September 2014) to Revision A
Page
• Changed "Bypass Mode Operation" description ................................................................................................................... 9
• Added sub-section "Controlled Transition into Bypass Mode" .............................................................................................. 9
• Added NOTE to the "Application and Implementation" section. .......................................................................................... 10
• Changed "List of Inductors" table ........................................................................................................................................ 11
2 Submit Documentation Feedback
Product Folder Links: TPS61291
Copyright © 2014, Texas Instruments Incorporated



Texas Instruments TPS61291
www.ti.com
5 Pin Configuration and Functions
DRV Package
6 Pin
Top View
TPS61291
SLVSBX9A – SEPTEMBER 2014 – REVISED SEPTEMBER 2014
SW 1
VOUT 2
VIN 3
6 GND
5 VSEL
4 EN/BYP
NAME
PIN
NO.
SW 1
VOUT
2
VIN 3
EN/BYP
4
VSEL
GND
EXPOSED
THERMAL
PAD
5
6
EN/BYP Pin
high
high
high
low
I/O
I
O
PWR
I
I
PWR
NC
Pin Functions
DESCRIPTION
Switch node of the converter. Connect the inductor between this pin and the input capacitor
CIN.
Boost converter output. Connect the output capacitor COUT between this pin and GND close
to the device.
Input voltage supply pin for the boost converter. Connect the input capacitor CIN between
this pin and GND as close as possible to the device.
Control pin of the device. A high level enables the boost mode operation. A low level
disables the boost converter and enables bypass mode operation. EN/BYP must be actively
terminated high or low. Usually, this pin is controlled by the MCU in the system.
Output voltage selection pin. The logic level of this pin is read out during startup and
internally latched. Connect this pin only to GND, VOUT, or leave it floating.
Ground pin of the device.
Not electrically connected to the IC, but must be soldered to achieve specified thermal
performance. Connect this pad to the GND pin and use it as a central GND plane.
Output Voltage Setting
VSEL Pin at Startup
GND
VOUT
3.3V
VOUT
3.0V
floating
2.5V
GND / VOUT / floating
VOUT = VIN (Bypass Mode)
Mode
Boost Mode Operation
Bypass Mode Operation
Copyright © 2014, Texas Instruments Incorporated
Product Folder Links: TPS61291
Submit Documentation Feedback
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