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TPS61200_08 TI | Alldatasheet

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0.3□V□to□5.5□V VOUT 1.8□V□to□5.5□V

10 F/c109

2.2 H/c109

0.1 F/c109

www.ti.com LOW INPUT VOLTAGE SYNCHRONOUS BOOST CONVERTER WITH 1.3-A SWITCHES Power Save Mode for Improved Efficiency at Low Output Power More than 90% Efficiency at Forced fixed Frequency Operation possible 300 mA Output Current at 3.3 V (VIN 2.4 Load Disconnect During Shutdown 600 mA Output Current at V (VIN Overtemperature Protection Automatic Transition between Boost Mode and Small mm x mm QFN-10 Package Down Conversion Mode Device Quiescent Current less than µ A All Single-Cell, Two-Cell and Three-Cell Startup into Full Load at 0.5 V Input Voltage Alkaline, NiCd or NiMH or Single-Cell Li Operating Input Voltage Range from Battery Powered Products 0.3 V to 5.5 V Fuel Cell And Solar Cell Powered Products Programmable Undervoltage Lockout Portable Audio Players Threshold PDAs Output Short Circuit Protection Under all Cellular Phones Operating Conditions Personal Medical Products Fixed and Adjustable Output Voltage Options White LED's from 1.8 V to 5.5 V The TPS6120x devices 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. It is also used in fuel cell or solar cell powered devices where the capability of handling low input voltages is essential. Possible output currents are depending on the input to output voltage ratio. The devices provides output currents up to 600 mA at a 5-V output while using a single-cell Li-Ion or Li-Polymer battery, and discharge it down to 2.5 The boost converter is based on a fixed frequency, pulse-width-modulation (PWM) controller using synchronous rectification to obtain maximum efficiency. At low load currents, the converter enters the Power Save mode to maintain a high efficiency over a wide load current range. The Power Save mode can be disabled, forcing the converter to operate at a fixed switching frequency. The maximum average input current is limited to a value of 1500 mA. The output voltage can be programmed by an external resistor divider, or is fixed internally on the chip. The converter can be disabled to minimize battery drain. During shutdown, the load is completely disconnected from the battery. The device is packaged in a 10-pin QFN PowerPAD package (DRC) measuring mm x mm. Please be aware that an important notice concerning availability, standard warranty, and use in critical sheet. PowerPAD is a trademark of Texas Instruments. PRODUCTION DATA information is current as of publication date. Copyright 2007 2008, Texas Instruments Incorporated Products conform to specifications per the terms of the Texas Instruments standard warranty. Production processing does not necessarily include testing of all parameters.

www.ti.com ABSOLUTE MAXIMUM RATINGS DISSIPATION RATINGS TABLE RECOMMENDED OPERATING CONDITIONS TPS61200 TPS61201 TPS61202 SLVS577B MARCH 2007 REVISED FEBRUARY 2008 These devices have limited built-in ESD protection. The leads should be shorted together or the device placed in conductive foam during storage or handling to prevent electrostatic damage to the MOS gates. AVAILABLE DEVICE OPTIONS (1) PACKAGE OUTPUT VOLTAGE T A PACKAGE (2) PART NUMBER (3) DC/DC MARKING Adjustable BRR TPS61200DRC 3.3 V BRS TPS61201DRC C to C 10-Pin QFN V BRT TPS61202DRC V CER TPS61202DSC (1) Contact the factory to check availability of other fixed output voltage versions. (2) For the most current package and ordering information, see the Package Option Addendum at the end of this document, or see the TI website at www.ti.com (3) The DRC and the DSC package are available taped and reeled. Add R suffix to device type (e.g., TPS61200DRCR or TPS61202DSCR) to order quantities of 3000 devices per reel. It is also available in minireels. Add a T suffix to the device type (i.e. TPS61200DRCT or TPS61202DSCT) to order quantities of 250 devices per reel. over operating free-air temperature range (unless otherwise noted) (1) TPS6120x UNIT V I Input voltage range on VIN, VAUX, VOUT, PS, EN, FB, UVLO 0.3 to V T J Operating junction temperature range to 150 C T stg Storage temperature range to 150 C Human Body Model (HBM) (2) kV ESD Machine Model (MM) (2) 200 V Charged Device Model (CDM) (2) 1.5 kV (1) Stresses beyond those listed under "absolute maximum ratings" may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated under "recommended operating conditions" is not implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability. (2) ESD testing is performed according to the respective JESD22 JEDEC standard. THERMAL RESISTANCE POWER RATING DERATING FACTOR ABOVE PACKAGE Θ JA T A C T A C DRC 48.7 C/W 2054 mW mW/ C MIN NOM MAX UNIT V SS Supply voltage at VIN 0.3 5.5 V T A Operating free air temperature range C T J Operating virtual junction temperature range 125 C Submit Documentation Feedback Copyright 2007 2008, Texas Instruments Incorporated Product Folder Link(s): TPS61200 TPS61201 TPS61202

www.ti.com ELECTRICAL CHARACTERISTICS TPS61200 TPS61201 TPS61202 SLVS577B MARCH 2007 REVISED FEBRUARY 2008 over recommended free-air temperature range and over recommended input voltage range (typical at an ambient temperature range of (unless otherwise noted) DC/DC STAGE PARAMETER TEST CONDITIONS MIN TYP MAX UNIT V I Input voltage range 0.3 5.5 V V I Minimum input voltage at startup 0.5 V V O TPS61200 output voltage range 1.8 5.5 V V FB TPS61200 feedback voltage 495 500 505 mV V OUT TPS61201 output voltage V IN V OUT PS 3.27 3.3 3.33 V V OUT TPS61202 output voltage V IN V OUT PS 4.95 5.0 5.05 V f Oscillator frequency 1250 1650 kHz I SW average switch current limit V OUT 3.3 V 1200 1350 1500 mA Rectifying switch on resistance V OUT 3.3 V 180 m Ω Main switch on resistance V OUT 3.3 V 150 m Ω Line regulation V IN V OUT PS 0.1% 0.5% Load regulation V IN V OUT PS 0.1% 0.5% V IN µ A I O mA, V EN V IN 1.2 Quiescent current V OUT V OUT 3.3 V AUX 3.3 V µ A PS V AUX µ A V IN 0.5 1.5 µ A Shutdown current V EN V IN 1.2 V V AUX µ A Leakage current into L V EN V IN 1.2 V L 1.2 V 0.01 µ A CONTROL STAGE PARAMETER TEST CONDITIONS MIN TYP MAX UNIT V AUX Auxiliary Output Voltage 2.4 5.5 V V IL EN input low voltage V IN 0.8 V 0.1 V IN V V IH EN input high voltage V IN 0.8 V 0.9 V IN V V IL EN input low voltage 0.8 V V IN 1.5 V 0.2 V IN V V IH EN input high voltage 0.8 V V IN 1.5 V 0.8 V IN V V IL EN input low voltage V IN 1.5 V 0.4 V V IH EN input high voltage V IN 1.5 V 1.2 V V IL PS input low voltage 0.4 V V IH PS input high voltage 1.2 V EN, PS input current Clamped on GND or V IN IN 1.5 0.01 0.1 µ A V UVLO Undervoltage lockout threshold for V UVLO decreasing 235 250 265 mV turn off V UVLO Undervoltage lockout threshold for V UVLO increasing 330 350 370 mV turn on UVLO input current V UVLO 0.5 V 0.3 µ A Overvoltage protection threshold 5.5 V Overtemperature protection 140 C Overtemperature hysteresis C Copyright 2007 2008, Texas Instruments Incorporated Submit Documentation Feedback Product Folder Link(s): TPS61200 TPS61201 TPS61202

www.ti.com PIN ASSIGNMENTS PGND L VIN EN GNDVOUT UVLO PS VAUX FB DRC□□PACKAGE (TOP VIEW) TPS61200 TPS61201 TPS61202 SLVS577B MARCH 2007 REVISED FEBRUARY 2008 Terminal Functions TERMINAL I/O NO. EN I Enable input (1: enabled, disabled). FB I Voltage feedback of adjustable versions, must be connected to V OUT at fixed output voltage versions GND Control logic ground PS I Enable/disable Power Save mode disabled, enabled) L I Connection for Inductor UVLO I Undervoltage lockout comparator input, must be connected to VAUX if not used PGND Power ground VIN I Boost converter input voltage VOUT O Boost converter output VAUX O/I Supply voltage for control stage PowerPAD Must be soldered to achieve appropriate power dissipation. Should be connected to PGND. Submit Documentation Feedback Copyright 2007 2008, Texas Instruments Incorporated Product Folder Link(s): TPS61200 TPS61201 TPS61202

www.ti.com VOUT VIN Device Control GND Gate Control VREF T emperature Control Oscillator UVLO FB PGND PGND PGND L Modulator PS Current Sensor V AUX VCC Control VOUT VCC EN PARAMETER MEASUREMENT INFORMATION LVIN EN UVLO PS GND PGND FB V AUX VOUT TPS61200 VIN VOUTC1 TPS61200 TPS61201 TPS61202 SLVS577B MARCH 2007 REVISED FEBRUARY 2008 FUNCTIONAL BLOCK DIAGRAM (TPS61200) List of Components: COMPONENT REFERENCE PART NUMBER MANUFACTURER VALUE any µ X7R Ceramic any x µ X7R Ceramic LPS3015-222ML Coilcraft 2.2 µ H Copyright 2007 2008, Texas Instruments Incorporated Submit Documentation Feedback Product Folder Link(s): TPS61200 TPS61201 TPS61202

www.ti.com TYPICAL CHARACTERISTICS Table of Graphs 200 400 600 800 1000 1200 1400 1600 1800 2000 V -□Input□Voltage□-□VI Maximum□Output□Current□-□mA TPS61201, V =□3.3□VO TPS61200, V =□1.8□VO TPS61202, V =□5□VO 100 0.10 1 10 100 1□k 10□k I -□Output□Current□-□mAO Efficiency□-□% V =□0.9□VI TPS61200 V =□1.8□V, Power□Save Enabled O V =□1.8□VI TPS61200 TPS61201 TPS61202 SLVS577B MARCH 2007 REVISED FEBRUARY 2008 FIGURE Maximum output current vs Input voltage vs Output current (TPS61200), Power Save Enabled vs Output current (TPS61200), Power Save Disabled vs Output current (TPS61201), Power Save Enabled vs Output current (TPS61201), Power Save Disabled vs Output current (TPS61202), Power Save Enabled Efficiency vs Output current (TPS61202), Power Save Disabled vs Input voltage (TPS61201), Power Save Enabled vs Input voltage (TPS61201), Power Save Disabled vs Input voltage (TPS61202), Power Save Enabled vs Input voltage (TPS61202), Power Save Disabled vs Output current (TPS61201) Output voltage vs Output current (TPS61202) Output Voltage TPS61201, Power Save Mode Disabled Output Voltage TPS61202, Power Save Mode Disabled Output Voltage TPS61201, Power Save Mode Enabled Output Voltage TPS61202, Power Save Mode Enabled TPS61201 Load Transient Response Waveforms TPS61202 Load Transient Response TPS61201 Line Transient Response TPS61202 Line Transient Response TPS61201 Startup after Enable TPS61202 Startup after Enable MAXIMUM OUTPUT CURRENT EFFICIENCY vs vs INPUT VOLTAGE OUTPUT CURRENT Figure Figure Submit Documentation Feedback Copyright 2007 2008, Texas Instruments Incorporated Product Folder Link(s): TPS61200 TPS61201 TPS61202

www.ti.com 100 0.10 1 10 100 1□k 10□k I -□Output□Current□-□mAO Efficiency□-□% V =□0.9□VI TPS61201 V =□3.3□V, Power□Save□Enabled O V =□1.8□VI V =□2.4□VI 100 0.10 1 10 100 1□k 10□k I -□Output□Current□-□mAO Efficiency□-□% V =□0.9□VI TPS61200 V =□1.8□V, Power□Save□Disabled O V =□1.8□VI 100 0.10 1 10 100 1□k 10□k I -□Output□Current□-□mAO Efficiency□-□% TPS61201 V =□3.3□V, Power□Save□Disabled O V =□1.8□VI V =□2.4□VI V =□0.9□VI 100 0.10 1 10 100 1□k 10□k I -□Output□Current□-□mAO Efficiency□-□% V =□0.9□VI TPS61202 V =□5□V, Power□Save□Enabled O V =□1.8□VI V =□3.6□VI V =□2.4□VI TPS61200 TPS61201 TPS61202 SLVS577B MARCH 2007 REVISED FEBRUARY 2008 EFFICIENCY EFFICIENCY vs vs OUTPUT CURRENT OUTPUT CURRENT Figure Figure EFFICIENCY EFFICIENCY vs vs OUTPUT CURRENT OUTPUT CURRENT Figure Figure Copyright 2007 2008, Texas Instruments Incorporated Submit Documentation Feedback Product Folder Link(s): TPS61200 TPS61201 TPS61202

www.ti.com V -□Input□Voltage□-□VI I =□10□mAO 100 Efficiency□-□% TPS61201 V =□3.3□V, Power□Save□Enabled O I =□500□mAO I =□100□mAO I =□1000□mAO 100 0.10 1 10 100 1□k 10□k I -□Output□Current□-□mAO Efficiency□-□% V =□0.9□VI TPS61202 V =□5□V, Power□Save□Disabled O V =□1.8□VI V =□3.6□VIV =□2.4□VI V -□Input□Voltage□-□VI I =□10□mAO 100 Efficiency□-□% TPS61202 V =□5□V, Power□Save□Enabled O I =□500□mAO I =□100□mAO I =□1000□mAO V -□Input□Voltage□-□VI I =□10□mAO 100 Efficiency□-□% TPS61201 V =□3.3□V, Power□Save□Disabled O I =□100□mAO I =□500□mAO I =□1000□mAO TPS61200 TPS61201 TPS61202 SLVS577B MARCH 2007 REVISED FEBRUARY 2008 EFFICIENCY EFFICIENCY vs vs OUTPUT CURRENT INPUT VOLTAGE Figure Figure EFFICIENCY EFFICIENCY vs vs INPUT VOLTAGE INPUT VOLTAGE Figure Figure 10. Submit Documentation Feedback Copyright 2007 2008, Texas Instruments Incorporated Product Folder Link(s): TPS61200 TPS61201 TPS61202

www.ti.com V -□Input□Voltage□-□VI I =□10□mAO 100 Efficiency□-□% TPS61202 V =□5□V, Power□Save□Disabled O I =□500□mAO I =□100□mAO I =□1000□mAO 3.27 3.30 3.33 1 10 100 1000 I -□Output□Current□-□mAO V -□Output□Voltage□-□VO V =□2.4□VI TPS61201 V =□3.3□V, Power□Save□Disabled O t□-□Time□-□0.5 s/div/c109 TPS61201 V =□3.3□V, Power□Save□Disabled O Output□Voltage20□mV/div , AC Inductor□Current100□mA/div, AC 4.95 5.05 1 10 100 100 I -□Output□Current□-□mAO V -□Output□Voltage□-□VO V =□2.4□VI TPS61202 V =□5□V, Power□Save□Disabled O TPS61200 TPS61201 TPS61202 SLVS577B MARCH 2007 REVISED FEBRUARY 2008 EFFICIENCY OUTPUT VOLTAGE vs vs INPUT VOLTAGE OUTPUT CURRENT Figure 11. Figure 12. OUTPUT VOLTAGE vs OUTPUT CURRENT OUTPUT VOLTAGE, POWER SAVE MODE DISABLED Figure 13. Figure 14. Copyright 2007 2008, Texas Instruments Incorporated Submit Documentation Feedback Product Folder Link(s): TPS61200 TPS61201 TPS61202

www.ti.com TPS61201 V =□3.3□V, Power□Save□Enabled O V =□1.8□V,□R =□33□kI L /c87 Output□Voltage20□mV/div, AC Inductor□Current100□mA/div ,AC t□-□Time□-□1 s/div/c109 TPS61202 V =□5□V, Power□Save□Disabled O Output□Voltage50□mV/div, AC Inductor□Current200□mA/div ,AC t□-□Time□-□100 s/div/c109 TPS61202 V =□5□V, Power□Save□Enabled O V =□1.8□V,□R =□55□kI L /c87 Output□Voltage20□mV/div , AC Inductor□Current200□mA/div, AC TPS61201 V =□3.3□VO Output□V oltage 50□mV/div , AC Output□Current 50□mA/div TPS61200 TPS61201 TPS61202 SLVS577B MARCH 2007 REVISED FEBRUARY 2008 OUTPUT VOLTAGE, POWER SAVE MODE DISABLED OUTPUT VOLTAGE IN POWER SAVE MODE Figure 15. Figure 16. OUTPUT VOLTAGE IN POWER SAVE MODE LOAD TRANSIENT RESPONSE Figure 17. Figure 18. Submit Documentation Feedback Copyright 2007 2008, Texas Instruments Incorporated Product Folder Link(s): TPS61200 TPS61201 TPS61202

www.ti.com TPS61202 V =□5□VO Output□Voltage100□mV/div, AC Output□Current 100□mA/div TPS61201 V =□3.3□VO Input□Voltage500□mV/div , AC Output□Voltage50□mV/div, AC TPS61202 V =□5□VO Input□Voltage500□mV/div, AC Output□V oltage 20□mV/div , AC t□-□Time□-□100 s/div/c109 TPS61201 V =□3.3□VO Voltage□at□L 2□V/div,□DC Inductor□Current□500□mA/div,□DC Enable□5□V/div,□DC Voltage□at□VAUX□2□V/div,□DC Output□Voltage□2□V/div,□DC TPS61200 TPS61201 TPS61202 SLVS577B MARCH 2007 REVISED FEBRUARY 2008 LOAD TRANSIENT RESPONSE LINE TRANSIENT RESPONSE Figure 19. Figure 20. LINE TRANSIENT RESPONSE START-UP AFTER ENABLE Figure 21. Figure 22. Copyright 2007 2008, Texas Instruments Incorporated Submit Documentation Feedback Product Folder Link(s): TPS61200 TPS61201 TPS61202

www.ti.com t□-□Time□-□100 s/div/c109 TPS61201 V =□3.3□VO Voltage□at□L 2□V/div,□DC Inductor□Current□500□mA/div,□DC Enable□5□V/div,□DC Voltage□at□VAUX□2□V/div,□DC Output□Voltage□2□V/div,□DC TPS61200 TPS61201 TPS61202 SLVS577B MARCH 2007 REVISED FEBRUARY 2008 START-UP AFTER ENABLE Figure 23. Submit Documentation Feedback Copyright 2007 2008, Texas Instruments Incorporated Product Folder Link(s): TPS61200 TPS61201 TPS61202

www.ti.com DETAILED topology. The average inductor current is regulated by a fast current regulator loop which is controlled by a voltage control loop. The controller also uses input and output voltage feedforward. Changes of input and output voltage are monitored and can immediately change the duty cycle in the modulator to achieve a fast response to those errors. The voltage error amplifier gets its feedback input from the FB pin. For adjustable output voltages, a resistive voltage divider must be connected to that pin. For fixed output voltages, FB must be connected to the output voltage to directly sense the voltage. Fixed output voltage versions use a trimmed internal resistive divider. The feedback voltage is compared with the internal reference voltage to generate a stable and accurate output voltage. The controller circuit also senses the average input current as well as the peak input current. Thus, the maximum input power is controlled as well as the maximum peak current to achieve a safe and stable operation under all possible conditions. To protect the device from overheating, an internal temperature sensor is implemented. The device uses three internal N-channel MOSFETs to maintain synchronous power conversion at all possible operating conditions. This enables the device to keep high efficiency over a wide input voltage and output power range. To avoid ground shift problems due to the high currents in the switches, two separate ground pins GND and PGND are used. The reference for all control functions is the GND pin. The power switches are connected to PGND. Both grounds must be connected on the PCB at only one point ideally close to the GND pin. Due to the 3-switch topology, the load is always disconnected from the input during shutdown of the converter. A boost converter only regulates output voltages which are higher than the input voltage. This device operates differently. For example, it is able to regulate V at the output with two fresh alkaline cells at the input having a total cell voltage of 3.2 Another example is powering white LEDs with a forward voltage of 3.6 V from a fully charged Li-Ion cell with an output voltage of 4.2 To control these properly, a Down Conversion mode is implemented. If the input voltage reaches or exceeds the output voltage, the converter automatically changes to a Down Conversion mode. In this mode, the control circuit changes the behavior of the two rectifying switches. While continuing switching it sets the voltage drop across the rectifying switches as high as needed to regulate the output voltage. This means the power losses in the converter increase. This must be taken into account for thermal consideration. The Power Save (PS) pin can be used to select different operation modes. To enable Power Save mode the PS pin must be set low. Power Save mode is used to improve efficiency at light load. If Power Save mode is enabled, the converter stops operating if the average inductor current decreases below about 300 mA and the output voltage is at or above its nominal value. If the output voltage decreases below its nominal value, the device ramps up the output voltage again by starting operation using a programmed average inductor current higher than required by the current load condition. Operation can last for one or several pulses. The converter stops operating once the conditions for stopping operation are met again. The Power Save mode can be disabled by programming high at the PS pin. In Down Conversion mode, Power Save mode is always enabled and the device cannot be forced into fixed frequency operation at light loads. The PS input supports standard logic thresholds. The device is put into operation when EN is set high. It is put into a Shutdown mode when EN is set to GND. In Shutdown mode, the regulator stops switching, all internal control circuitry including the low-battery comparator is switched off, and the load is disconnected from the input. This also means that the output voltage can drop below the input voltage during shutdown. During start-up of the converter, the duty cycle and the peak current are limited in order to avoid high peak currents drawn from the battery. Copyright 2007 2008, Texas Instruments Incorporated Submit Documentation Feedback Product Folder Link(s): TPS61200 TPS61201 TPS61202

www.ti.com Softstart and Short-Circuit Protection Undervoltage Lockout Overtemperature Protection TPS61200 TPS61201 TPS61202 SLVS577B MARCH 2007 REVISED FEBRUARY 2008 After being enabled, the device starts operating. At first it keeps the main output VOUT disconnected, and charges the capacitor at VAUX. If the capacitor at VAUX is charged to about 2.5 the device switches to normal operation. This means VOUT is turned on and the capacitor at VOUT is charged while the load connected to the device is supplied. To ramp up the output voltage in a controlled way, the average current limit is set to 400 mA and rise proportional to the increase of the output voltage. At an output voltage of about 1.2 the current limit is at its nominal value. If the output voltage does not increase, the current limit will not increase. There is no timer implemented. Thus the output voltage overshoot at startup, as well as the inrush current, is kept at a minimum. The device ramps up the output voltage in a controlled manner even if a large capacitor is connected at the output. When the output voltage does not increase above 1.2 the device assumes a short-circuit at the output, and keeps the current limit low to protect itself and the application. When there is a short at the output during operation, the current limit is decreased accordingly. An undervoltage lockout function prevents the main output at VOUT from being supplied if the voltage at UVLO drops below 0.25 When using a resistive divider at the voltage to be monitored, for example the supply voltage, any threshold for the monitored voltage can be programmed. If in undervoltage lockout mode, the device still maintains its supply voltage at VAUX, but it is not turned off until EN is programmed low. This undervoltage lockout function is implemented in order to prevent the malfunctioning of the converter. The device has a built-in temperature sensor which monitors the internal IC temperature. If the temperature exceeds the programmed threshold (see electrical characteristics table), the device stops operating. As soon as the IC temperature has decreased below the programmed threshold, it starts operating again. There is a built-in hysteresis to avoid unstable operation at IC temperatures at the overtemperature threshold. Submit Documentation Feedback Copyright 2007 2008, Texas Instruments Incorporated Product Folder Link(s): TPS61200 TPS61201 TPS61202

www.ti.com APPLICATION INFORMATION DESIGN PROCEDURE Programming the Output Voltage OUT FB VR1 = R2 x - 1V /c230 /c246 /c231 /c247 /c232 /c248 (1) LVIN EN UVLO PS GND PGND FB V AUX VOUT TPS61200 VIN VOUTC1 Programming the UVLO Threshold Voltage TPS61200 TPS61201 TPS61202 SLVS577B MARCH 2007 REVISED FEBRUARY 2008 The TPS6120x 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 0.7 V and 5.5 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 Additionally, any other voltage source like solar cells or fuel cells with a typical output voltage between 0.3 V and 5.5 V can power systems where the TPS6120x is used. Within the TPS6120X family, there are fixed and adjustable output voltage versions available. To properly configure the fixed output voltage devices, the FB pin is used to sense the output voltage. This means that it must be connected directly to VOUT. At the adjustable output voltage versions, an external resistor divider is used to adjust the output voltage. The resistor divider must be connected between VOUT, FB and GND. When the output voltage is regulated properly, the typical value of the voltage at the FB pin is 500 mV. The maximum recommended value for the output voltage is 5.5 The current through the resistive divider should be about 100 times greater than the current into the FB pin. The typical current into the FB pin is 0.01 µ and the voltage across the resistor between FB and GND, R is typically 500 mV. Based on those two values, the recommended value for R should be lower than 500 k Ω in order to set the divider current at µ A or higher. It is recommended to keep the value for this resistor in the range of 200 k Ω The value of the resistor connected between VOUT and FB, R1, depending on the needed output voltage OUT can be calculated using Equation If as an example, an output voltage of 3.3 V is needed, a 1-M Ω resistor should be chosen for R when for R a 180-k Ω has been selected. Figure 24. Typical Application Circuit for Adjustable Output Voltage Option The UVLO input can be used to shut down the main output if the supply voltage is getting too low. The internal reference threshold is typically 250 mV. If the supply voltage should cause the shutdown when it is dropping below 250 mV, it can be connected directly to the UVLO pin. If the shutdown has already happen at higher voltages, a resistor divider can be used. and in Figure show an example of how to monitor the input voltage of the circuit. The current through the resistive divider should be about 100 times greater than the current into the UVLO pin. The typical current into the UVLO pin is 0.01 µ and the voltage across is equal to the UVLO voltage threshold that is generated on-chip, which has a value of 250 mV. The recommended value for is; therefore, in the range of 250 k Ω From this, the value of resistor R3, depending on the desired shutdown voltage V INMIN, can be calculated using Equation Copyright 2007 2008, Texas Instruments Incorporated Submit Documentation Feedback Product Folder Link(s): TPS61200 TPS61201 TPS61202

www.ti.com INMIN UVLO VR3 = R4 x - 1V /c230 /c246 /c231 /c247 /c231 /c247 /c232 /c248 (2) Inductor Selection MIN IN sL = V x 0.5 A /c109 (3) /c40 /c41IN OUT INOUT OUTLMAX IN OUT V x V VV x II = + 0.8 x V 2 x V x f x L /c45 (4) Capacitor Selection Input Capacitor Output Capacitor OUT FC = 5 x L x H /c109 /c109 (5) TPS61200 TPS61201 TPS61202 SLVS577B MARCH 2007 REVISED FEBRUARY 2008 To make sure that the TPS6120X devices can operate, an inductor must be connected between pin VIN and pin To estimate the minimum inductance value Equation can be used. In Equation the minimum inductance, L MIN for boost mode operation is calculated. V IN is the maximum input voltage. The recommended inductor value range is between 1.5 µ H and 4.7 µ The minimum inductor value should not be below 1.5 µ even if Equation yields in something lower. Using 2.2 µ H is recommended anyway for getting best performance over the whole input and output voltage range. With the chosen inductance value, the peak current for the inductor in steady state operation can be calculated. Equation shows how to calculate the peak current I This would be the critical value for the current rating for selecting the inductor. It also needs to be taken into account that load transients and error conditions may cause higher inductor currents. The following inductor series from different suppliers have been used with TPS6120x converters: Table List of Inductors VENDOR INDUCTOR SERIES LPS3015 Coilcraft LPS4012 Murata LQH3NP Tajo Yuden NR3015 Wurth Elektronik WE-TPC Typ S At least a 4.7 µ F input capacitor is recommended to improve transient behavior of the regulator and EMI behavior of the total power supply circuit. A ceramic capacitor placed as close as possible to the VIN and PGND pins of the IC is recommended. For the output capacitor, it is recommended to use small ceramic capacitors placed as close as possible to the VOUT and PGND pins of the IC. If, for any reason, the application requires the use of large capacitors which can not be placed close to the IC, using a smaller ceramic capacitor in parallel to the large one is recommended. This small capacitor should be placed as close as possible to the VOUT and PGND pins of the IC. To get an estimate of the recommended minimum output capacitance, Equation can be used. A capacitor with a value in the range of the calculated minimum should be used. This is required to maintain control loop stability. There are no additional requirements regarding minimum ESR. There is also no upper limit for the output capacitance value. Larger capacitors cause lower output voltage ripple as well as lower output voltage drop during load transients. Submit Documentation Feedback Copyright 2007 2008, Texas Instruments Incorporated Product Folder Link(s): TPS61200 TPS61201 TPS61202

www.ti.com Capacitor at VAUX Layout Considerations THERMAL INFORMATION P D(MAX) /C0043 TJ(MAX) /C0042TA R /C0113JA /C0043125°C /C004285°C 48.7°C /C0324W /C0043820 mW (6) TPS61200 TPS61201 TPS61202 SLVS577B MARCH 2007 REVISED FEBRUARY 2008 Between the VAUX pin and GND a capacitor must be connected. This capacitor is used to maintain and filter the control supply voltage. It is charged during startup and before the main output VOUT is turned on. To ensure stable operation, using at least 0.1 µ F is recommended. At output voltages below 2.5 the capacitance should be in the range of µ Since this capacitor is also used as a snubber capacitor for the main switch, using a ceramic capacitor with low ESR is important. 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. The input and output capacitor, as well as the inductor should be placed as close as possible to the IC. Use a common ground node for power ground and a different one for control ground to minimize the effects of ground noise. Connect these ground nodes at any place close to one of the ground pins of the IC. The feedback divider should be placed as close as possible to the control ground pin of the IC. To lay out the control ground, it is recommended to use short traces as well, separated from the power ground traces. This avoids ground shift problems, which can occur due to superimposition of power ground current and control ground current. 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. Three basic approaches for enhancing thermal performance are listed below. Improving the power dissipation capability of the PCB design Improving the thermal coupling of the component to the PCB Introducing airflow in the system The maximum recommended junction temperature J of the TPS6120x devices is 125 The thermal resistance of the 10-pin QFN package (DRC) is R θ JA 48.7 C/W, if the PowerPAD is soldered. Specified regulator operation is assured to a maximum ambient temperature T A of Therefore, the maximum power dissipation is about 820 mW. More power can be dissipated if the maximum ambient temperature of the application is lower. Copyright 2007 2008, Texas Instruments Incorporated Submit Documentation Feedback Product Folder Link(s): TPS61200 TPS61201 TPS61202

Orderable Device Status(1) Package Type Package Drawing Pins Package Qty Eco Plan(2) Lead/Ball FinishMSL Peak Temp (3) TPS61200DRCR ACTIVE SON DRC 10 3000 Green (RoHS & no Sb/Br) CU NIPDAU Level-2-260C-1 YEAR TPS61200DRCRG4 ACTIVE SON DRC 10 3000 Green (RoHS & no Sb/Br) CU NIPDAU Level-2-260C-1 YEAR TPS61200DRCT ACTIVE SON DRC 10 250 Green (RoHS & no Sb/Br) CU NIPDAU Level-2-260C-1 YEAR TPS61200DRCTG4 ACTIVE SON DRC 10 250 Green (RoHS & no Sb/Br) CU NIPDAU Level-2-260C-1 YEAR TPS61201DRCR ACTIVE SON DRC 10 3000 Green (RoHS & no Sb/Br) CU NIPDAU Level-2-260C-1 YEAR TPS61201DRCRG4 ACTIVE SON DRC 10 3000 Green (RoHS & no Sb/Br) CU NIPDAU Level-2-260C-1 YEAR TPS61201DRCT ACTIVE SON DRC 10 250 Green (RoHS & no Sb/Br) CU NIPDAU Level-2-260C-1 YEAR TPS61201DRCTG4 ACTIVE SON DRC 10 250 Green (RoHS & no Sb/Br) CU NIPDAU Level-2-260C-1 YEAR TPS61202DRCR ACTIVE SON DRC 10 3000 Green (RoHS & no Sb/Br) CU NIPDAU Level-2-260C-1 YEAR TPS61202DRCRG4 ACTIVE SON DRC 10 3000 Green (RoHS & no Sb/Br) CU NIPDAU Level-2-260C-1 YEAR TPS61202DRCT ACTIVE SON DRC 10 250 Green (RoHS & no Sb/Br) CU NIPDAU Level-2-260C-1 YEAR TPS61202DRCTG4 ACTIVE SON DRC 10 250 Green (RoHS & no Sb/Br) CU NIPDAU Level-2-260C-1 YEAR TPS61202DSCR ACTIVE SON DSC 10 3000 Green (RoHS & no Sb/Br) CU NIPDAU Level-2-260C-1 YEAR TPS61202DSCRG4 ACTIVE SON DSC 10 3000 Green (RoHS & no Sb/Br) CU NIPDAU Level-2-260C-1 YEAR TPS61202DSCT ACTIVE SON DSC 10 250 Green (RoHS & no Sb/Br) CU NIPDAU Level-2-260C-1 YEAR TPS61202DSCTG4 ACTIVE SON DSC 10 250 Green (RoHS & no Sb/Br) CU NIPDAU Level-2-260C-1 YEAR (1)The marketing status values are defined as follows: ACTIVE: Product device recommended for new designs. LIFEBUY: TI has announced that the device will be discontinued, and a lifetime-buy period is in effect. NRND: Not recommended for new designs. Device is in production to support existing customers, but TI does not recommend using this part in a new design. PREVIEW: Device has been announced but is not in production. Samples may or may not be available. OBSOLETE: TI has discontinued the production of the device. (2)Eco Plan - The planned eco-friendly classification: Pb-Free (RoHS), Pb-Free (RoHS Exempt), or Green (RoHS & no Sb/Br) - please check http://www.ti.com/productcontentfor the latest availability information and additional product content details. TBD: The Pb-Free/Green conversion plan has not been defined. Pb-Free (RoHS):TI's terms "Lead-Free" or "Pb-Free" mean semiconductor products that are compatible with the current RoHS requirements for all 6 substances, including the requirement that lead not exceed 0.1% by weight in homogeneous materials. Where designed to be soldered at high temperatures, TI Pb-Free products are suitable for use in specified lead-free processes. Pb-Free (RoHS Exempt):This component has a RoHS exemption for either 1) lead-based flip-chip solder bumps used between the die and package, or 2) lead-based die adhesive used between the die and leadframe. The component is otherwise considered Pb-Free (RoHS compatible) as defined above. Green (RoHS & no Sb/Br):TI defines "Green" to mean Pb-Free (RoHS compatible), and free of Bromine (Br) and Antimony (Sb) based flame retardants (Br or Sb do not exceed 0.1% by weight in homogeneous material) PACKAGE OPTION ADDENDUM www.ti.com 11-Apr-2008 Addendum-Page 1

(3) MSL, Peak Temp. -- The Moisture Sensitivity Level rating according to the JEDEC industry standard classifications, and peak solder temperature. Important Information and Disclaimer:The information provided on this page represents TI's knowledge and belief as of the date that it is provided. TI bases its knowledge and belief on information provided by third parties, and makes no representation or warranty as to the accuracy of such information. Efforts are underway to better integrate information from third parties. TI has taken and continues to take reasonable steps to provide representative and accurate information but may not have conducted destructive testing or chemical analysis on incoming materials and chemicals. TI and TI suppliers consider certain information to be proprietary, and thus CAS numbers and other limited information may not be available for release. In no event shall TI's liability arising out of such information exceed the total purchase price of the TI part(s) at issue in this document sold by TI to Customer on an annual basis. PACKAGE OPTION ADDENDUM www.ti.com 11-Apr-2008 Addendum-Page 2

*All dimensions are nominal Device Package Type Package Drawing Pins SPQ Reel Diameter (mm) Reel Width W1 (mm) A0 (mm) B0 (mm) K0 (mm) P1 (mm) W (mm) Pin1 Quadrant PACKAGE MATERIALS INFORMATION www.ti.com 6-Nov-2008 Pack Materials-Page 1

*All dimensions are nominal Device Package Type Package Drawing Pins SPQ Length (mm) Width (mm) Height (mm) TPS61200DRCR SON DRC 10 3000 346.0 346.0 29.0 TPS61200DRCT SON DRC 10 250 190.5 212.7 31.8 TPS61201DRCR SON DRC 10 3000 346.0 346.0 29.0 TPS61201DRCT SON DRC 10 250 190.5 212.7 31.8 TPS61202DRCR SON DRC 10 3000 346.0 346.0 29.0 TPS61202DRCT SON DRC 10 250 190.5 212.7 31.8 TPS61202DSCR SON DSC 10 3000 346.0 346.0 29.0 TPS61202DSCT SON DSC 10 250 346.0 346.0 29.0 PACKAGE MATERIALS INFORMATION www.ti.com 6-Nov-2008 Pack Materials-Page 2

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Summary

LOW INPUT VOLTAGE SYNCHRONOUS BOOST CONVERTER WITH 1.3-A SWITCHES

Description