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TPS61097-33

0.9 V to 3.3V

VOUT

GND

VIN

+3.3V

OUT

TPS61097

www.ti.com

SLVS872C –JUNE 2009– REVISED DECEMBER 2011

LOW INPUT VOLTAGE SYNCHRONOUS BOOST CONVERTER

WITH LOW QUIESCENT CURRENT

Check for Samples: TPS61097

FEATURES

• Up to 95% Efficiency at Typical Operating APPLICATIONS

Conditions

• MSP430 Applications

• Connection from Battery to Load via Bypass

• All Single-Cell, Two-Cell, and Three-Cell

Switch in Shutdown Mode

Alkaline, NiCd, NiMH, or Single-Cell Li-Battery

• Typical Shutdown Current Less Than 5 nA

Powered Products

• Typical Quiescent Current Less Than 5 μA

• Personal Medical Products

• Operating Input Voltage Range

• Fuel Cell and Solar Cell Powered Products

From 0.9 V to 5.5 V

• PDAs

• Power-Save Mode for Improved Efficiency at

• Mobile Applications

Low Output Power

• White LEDs

• Overtemperature Protection

• Small 2.8-mm x 2.9-mm 5-Pin SOT-23 Package

(6-Pin for Adjustable)

DESCRIPTION

The TPS61097 provide a power supply solution for products powered by either a single-cell, two-cell, or

three-cell alkaline, NiCd, or NiMH, or one-cell Li-Ion or Li-polymer battery. They can also be used in fuel cell or

solar cell powered devices where the capability of handling low input voltages is essential. Possible output

currents depend on the input-to-output voltage ratio. The devices provides output currents up to 100 mA at a

3.3-V output while using a single-cell Li-Ion or Li-Polymer battery. The boost converter is based on a

current-mode controller using synchronous rectification to obtain maximum efficiency. The maximum average

input current is limited to a value of 350 mA. The output voltage can be programmed by an external resistor

divider, or it is fixed internally on the chip. The converter can be disabled to minimize battery drain. During

shutdown, the battery is connected to the load to enable battery backup of critical functions on the load. The

fixed output device is packaged in a 5-pin SOT-23 package (DBV) measuring 2.8 mm × 2.9 mm.

Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas

Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

UNLESS OTHERWISE NOTED this document contains

PRODUCTION DATA information current as of publication date.

Products conform to specifications per the terms of Texas

Instruments standard warranty. Production processing does not

necessarily include testing of all parameters.

Summary of content (27 pages)

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TPS61097 SLVS872C – JUNE 2009 – REVISED DECEMBER 2011 www.ti.com LOW INPUT VOLTAGE SYNCHRONOUS BOOST CONVERTER WITH LOW QUIESCENT CURRENT Check for Samples: TPS61097 FEATURES 1 • • • • • • • • APPLICATIONS Up to 95% Efficiency at Typical Operating Conditions Connection from Battery to Load via Bypass Switch in Shutdown Mode Typical Shutdown Current Less Than 5 nA Typical Quiescent Current Less Than 5 μA Operating Input Voltage Range From 0.9 V to 5.
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TPS61097 SLVS872C – JUNE 2009 – REVISED DECEMBER 2011 www.ti.com ORDERING INFORMATION PACKAGE (3) TA –40°C to 85°C (1) 5-pin SOT-23 – DBV (1) (2) ORDERABLE PART NUMBER Reel of 3000 TPS61097-33DBVR Reel of 250 TPS61097-33DBVT TOP-SIDE MARKING NFSK For the most current package and ordering information, see the Package Option Addendum at the end of this document, or see the TI web site at www.ti.com. Contact the factory for availability of other fixed output voltage versions.
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TPS61097 SLVS872C – JUNE 2009 – REVISED DECEMBER 2011 www.ti.com ELECTRICAL CHARACTERISTICS over recommended free-air temperature range and over recommended input voltage range (typical at an ambient temperature range of 25°C) (unless otherwise noted) DC/DC STAGE PARAMETER TEST CONDITIONS MIN TYP MAX 0.9 VIN Input voltage VOUT TPS61097-33 VIN = 1.2 V , IOUT = 10 mA 3.20 3.30 3.40 V ISW Switch current limit VOUT = 3.3 V 200 350 475 mA Rectifying switch on resistance VOUT = 3.3 V 1.
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TPS61097 SLVS872C – JUNE 2009 – REVISED DECEMBER 2011 www.ti.com PIN ASSIGNMENTS FIXED OUTPUT VOLTAGE DBV PACKAGE (TOP VIEW) VIN 1 GND 2 EN 3 5 L 4 VOUT Terminal Functions TERMINAL NAME 4 NO. I/O DESCRIPTION Fixed VIN 1 I Boost converter input voltage GND 2 EN 3 I Enable input (1 = enabled, 0 = disabled). EN must be actively terminated high or low.
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TPS61097 SLVS872C – JUNE 2009 – REVISED DECEMBER 2011 www.ti.com FUNCTIONAL BLOCK DIAGRAM (FIXED OUTPUT VERSION) Bypass Switch P N L VOUT Rectifying Switch Thermal Shutdown Startup Circuit N Driver VIN Undervoltage Lockout Bypass Switch Control Main Switch Control Logic Current Sense EN Overvoltage Protection GND 1.
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TPS61097 SLVS872C – JUNE 2009 – REVISED DECEMBER 2011 www.ti.com PARAMETER MEASUREMENT INFORMATION L L1 TPS61097-33 VOUT VOUT +3.3V C2 VIN 0.9 V to 3.3V VIN C1 EN GND C1 10 μF C2 10 μF L 10 μH Table 1. List of Components 6 REFERENCE MANUFACTURER PART NO.
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TPS61097 SLVS872C – JUNE 2009 – REVISED DECEMBER 2011 www.ti.com TYPICAL CHARACTERISTICS Table 2. Table of Graphs FIGURE Maximum Output Current Efficiency Input Current Startup Voltage Output Voltage Waveforms vs Input Voltage 1 vs Output Current 2 vs Input Voltage 3 vs Input Voltage (Device Enabled, No Output Load, VOUT = 3.
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TPS61097 SLVS872C – JUNE 2009 – REVISED DECEMBER 2011 www.ti.com EFFICIENCY vs INPUT VOLTAGE INPUT CURRENT vs INPUT VOLTAGE 100 20 IOUT = 10 mA 90 18 80 16 IIN – Input Current – µA Efficiency – % 70 IOUT = 100 µA 60 IOUT = 5 mA IOUT = 100 mA 50 IOUT = 50 mA 40 30 20 Device Enabled No Output Load VOUT = 3.3 V 14 12 10 8 6 4 COUT = 10 µF, ceramic L = 10 µH 10 2 0 0 0.9 1.2 1.5 1.8 2.1 2.4 2.7 3.0 0.9 1.2 1.5 1.8 2.1 2.4 VIN – Input Voltage – V Figure 4.
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TPS61097 SLVS872C – JUNE 2009 – REVISED DECEMBER 2011 www.ti.com STARTUP VOLTAGE vs OUTPUT CURRENT OUTPUT VOLTAGE vs OUTPUT CURRENT 0.725 3.32 COUT = 10 µF, ceramic L = 10 µH VIN = 1.8 V 3.30 VOUT – Output Voltage – V Startup Voltage – V 0.720 0.715 0.710 VIN = 0.9 V VIN = 1.2 V 3.26 VIN = 1.5 V VIN = 1.8 V 3.24 0.700 3.20 10 VIN = 3.0 V 3.28 3.22 1 VIN = 2.5 V VIN = 2.7 V 0.705 0 1 100 VIN = 2.1 V 10 100 IOUT – Output Current – mA 1000 IOUT – Output Current – mA Figure 7.
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TPS61097 SLVS872C – JUNE 2009 – REVISED DECEMBER 2011 www.ti.com OUTPUT VOLTAGE RIPPLE Inductor Current VIN = 1.8 V IOUT = 50 mA COUT = 10 µF, ceramic L = 10 µH VOUT Figure 10. LOAD TRANSIENT RESPONSE IOUT VIN = 1.2 V IOUT = 6 mA to 50 mA VOUT Figure 11.
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TPS61097 SLVS872C – JUNE 2009 – REVISED DECEMBER 2011 www.ti.com LINE TRANSIENT RESPONSE VIN Offset 1.8 V VIN = 1.8 V to 2.4 V RLOAD = 100 W VOUT Figure 12. SWITCHING WAVEFORM, CONTINUOUS MODE VIN = 1.8 V IOUT = 50 mA Inductor Current Inductor Voltage VOUT Figure 13.
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TPS61097 SLVS872C – JUNE 2009 – REVISED DECEMBER 2011 www.ti.com SWITCHING WAVEFORM, DISCONTINUOUS MODE VIN = 1.8 V IOUT = 10 mA Inductor Current Inductor Voltage VOUT Figure 14. STARTUP AFTER ENABLE VIN = 1.2 V IOUT = 10 mA VOUT VEN Figure 15.
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TPS61097 SLVS872C – JUNE 2009 – REVISED DECEMBER 2011 www.ti.com STARTUP AFTER ENABLE VIN = 1.8 V IOUT = 10 mA VOUT VEN Figure 16.
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TPS61097 SLVS872C – JUNE 2009 – REVISED DECEMBER 2011 www.ti.com DETAILED DESCRIPTION Operation The TPS61097 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. Controller Circuit The device is controlled by a hysteretic current mode controller.
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TPS61097 www.ti.com SLVS872C – JUNE 2009 – REVISED DECEMBER 2011 If the output voltage drops below the input voltage the backgate diode of the rectifying switch gets forward biased and current starts flow through it. Because this diode cannot be turned off, the load current is only limited by the remaining DC resistances. As soon as the overload condition is removed, the converter automatically resumes normal operation and enters the appropriate soft start mode depending on the operating conditions.
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TPS61097 SLVS872C – JUNE 2009 – REVISED DECEMBER 2011 www.ti.com APPLICATION INFORMATION Design Procedure The TPS61097 DC/DC converters are intended for systems powered by a single up to triple cell Alkaline, NiCd, NiMH battery with a typical terminal voltage between 0.9 V and 5.5 V. They can also be used in systems powered by one-cell Li-Ion or Li-Polymer with a typical voltage between 2.5 V and 4.2 V.
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TPS61097 SLVS872C – JUNE 2009 – REVISED DECEMBER 2011 www.ti.com Equation 3 provides an easy way to estimate whether the device is operating in continuous or discontinuous operation. As long as the equation is true, continuous operation is typically established. If the equation becomes false, discontinuous operation is typically established. VOUT ´ IOUT > 0.
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TPS61097 SLVS872C – JUNE 2009 – REVISED DECEMBER 2011 www.ti.com Table 4. Recommended Output Capacitors 18 VENDOR CAPACITOR SERIES Murata GRM188R60J106M47D 10μF 6.
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TPS61097 SLVS872C – JUNE 2009 – REVISED DECEMBER 2011 www.ti.com Layout Considerations As for all switching power supplies, the layout is an important step in the design, especially at high peak currents and high switching frequencies. If the layout is not carefully done, the regulator could show stability problems as well as EMI problems. Therefore, use wide and short traces for the main current path and for the power ground tracks.
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TPS61097 SLVS872C – JUNE 2009 – REVISED DECEMBER 2011 www.ti.com Figure 20. PCB Top View Thermal Information Implementation of integrated circuits in low-profile and fine-pitch surface-mount packages typically requires special attention to power dissipation. Many system-dependent issues such as thermal coupling, airflow, added heat sinks and convection surfaces, and the presence of other heat-generating components affect the power-dissipation limits of a given component.
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TPS61097 SLVS872C – JUNE 2009 – REVISED DECEMBER 2011 www.ti.com REVISION HISTORY Changes from Revision B (December 2009) to Revision C Page • Deleted Fixed Output Voltage Options from 1.8V to 5.0V .................................................................................................... 1 • Deleted adjustable output feature from DESCRIPTION. ......................................................................................................
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PACKAGE OPTION ADDENDUM www.ti.
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PACKAGE MATERIALS INFORMATION www.ti.com 4-Jun-2014 TAPE AND REEL INFORMATION *All dimensions are nominal Device TPS61097-33DBVR Package Package Pins Type Drawing SPQ SOT-23 3000 DBV 5 Reel Reel A0 Diameter Width (mm) (mm) W1 (mm) 180.0 8.4 Pack Materials-Page 1 3.23 B0 (mm) K0 (mm) P1 (mm) 3.17 1.37 4.0 W Pin1 (mm) Quadrant 8.
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PACKAGE MATERIALS INFORMATION www.ti.com 4-Jun-2014 *All dimensions are nominal Device Package Type Package Drawing Pins SPQ Length (mm) Width (mm) Height (mm) TPS61097-33DBVR SOT-23 DBV 5 3000 202.0 201.0 28.
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IMPORTANT NOTICE Texas Instruments Incorporated and its subsidiaries (TI) reserve the right to make corrections, enhancements, improvements and other changes to its semiconductor products and services per JESD46, latest issue, and to discontinue any product or service per JESD48, latest issue. Buyers should obtain the latest relevant information before placing orders and should verify that such information is current and complete.