Datasheet

ManualsBrandsTEXAS INSTRUMENTS ManualsPMICsPMIC - DC/DC voltage regulator Boost SC 70 6

10µF

4.7

VIN

VOUT

10µF

GND

TLV61225

OUT

3.3 V

0.8 V to V

OUT

TLV61225

www.ti.com

SLVSAF0 –AUGUST 2010

SINGLE CELL HIGH EFFICIENT STEP-UP CONVERTER IN 6 PIN SC-70 PACKAGE

FEATURES

APPLICATIONS

• Battery Powered Applications

• Up to 94% Efficiency at Typical Operating

Conditions

– 1 to 2 Cell NiMH or Alkaline

– 1 cell Li-Primary

• 5 mA Quiescent Current

• Consumer and Portable Medical Products

• Operating Input Voltage from 0.7 V to 3.3 V

• Personal Care Products

• Pass-Through Function during Shutdown

• More than 40mA Output Current from a 1.2V

Input

• Typical Switch Current Rating 400 mA

• Output Overvoltage Protection

• Overtemperature Protection

• Fixed 3.3 V Output Voltage

• Small 6-pin SC-70 Package

DESCRIPTION

The TLV61225 provides a power-supply solution for products powered by either a single-cell or two-cell alkaline

or NiMH, or one-cell Li-primary battery. Possible output currents depend on the input-to-output voltage ratio. The

boost converter is based on a hysteretic controller topology using synchronous rectification to obtain maximum

efficiency at minimal quiescent currents. The output voltage of this device is set internally to a fixed output

voltage of 3.3 V. The converter can be switched off by a featured enable pin. While being switched off, battery

drain is minimized. The device is offered in a 6-pin SC-70 package (DCK) measuring 2 mm x 2 mm to enable

small circuit layout size.

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.

PRODUCTION DATA information is current as of publication date.

Products conform to specifications per the terms of the Texas

Instruments standard warranty. Production processing does not

necessarily include testing of all parameters.

Summary of content (18 pages)

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TLV61225 www.ti.com SLVSAF0 – AUGUST 2010 SINGLE CELL HIGH EFFICIENT STEP-UP CONVERTER IN 6 PIN SC-70 PACKAGE FEATURES APPLICATIONS • • 1 • • • • • • • • • Up to 94% Efficiency at Typical Operating Conditions 5 mA Quiescent Current Operating Input Voltage from 0.7 V to 3.3 V Pass-Through Function during Shutdown More than 40mA Output Current from a 1.2V Input Typical Switch Current Rating 400 mA Output Overvoltage Protection Overtemperature Protection Fixed 3.
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TLV61225 SLVSAF0 – AUGUST 2010 www.ti.com This integrated circuit can be damaged by ESD. Texas Instruments recommends that all integrated circuits be handled with appropriate precautions. Failure to observe proper handling and installation procedures can cause damage. ESD damage can range from subtle performance degradation to complete device failure.
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TLV61225 www.ti.com SLVSAF0 – AUGUST 2010 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 VIN Maximum minimum input voltage RLoad ≥ 150 Ω, TA = 25°C for startup VOUT TLV61225 output voltage ILH Inductor current ripple ISW switch current limit VOUT = 3.3 V, VIN = 1.
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TLV61225 SLVSAF0 – AUGUST 2010 www.ti.com PIN ASSIGNMENTS DCK PACKAGE (TOP VIEW) VIN FB GND EN L VOUT Terminal Functions TERMINAL NAME NO. I/O DESCRIPTION EN 6 I Enable input (1: enabled, 0: disabled). Must be actively tied high or low. FB 2 I Output voltage sense input. Must be connected to VOUT.
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TLV61225 www.ti.com SLVSAF0 – AUGUST 2010 FUNCTIONAL BLOCK DIAGRAM (TLV61225) L VOUT VOUT VIN Gate Driver VIN Start Up EN Device Control Current Sensor FB GND VREF PARAMETER MEASUREMENT INFORMATION L1 L VIN VOUT VOUT VIN C2 FB EN C1 GND TLV61225 Table 1. List of Components: COMPONENT REFERENCE PART NUMBER MANUFACTURER VALUE C1 GRM188R60J106ME84D Murata 10 mF, 6.3V C2 GRM188R60J106ME84D Murata 10 mF, 6.3V L1 EPL3015-472MLB Coilcraft 4.
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TLV61225 SLVSAF0 – AUGUST 2010 www.ti.com TYPICAL CHARACTERISTICS Table of Graphs FIGURE Minimum of Maximum Output Current Efficiency Input Current Output Voltage Waveforms vs Input Voltage 1 vs Output Current, VIN = [1.2 V; 2.4 V; 3 V] 2 vs Input Voltage, IOUT = [100 uA; 1 mA; 10 mA; 50 mA] 3 vs Input Voltage at No Output Load, Device Enabled 4 vs Output Current, VIN = [1.2 V; 2.4 V] 5 vs Input Voltage, Device Disabled, RLOAD = [1 kΩ; 10 kΩ] 6 Output Voltage Ripple VIN = 1.
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TLV61225 www.ti.com SLVSAF0 – AUGUST 2010 EFFICIENCY vs INPUT VOLTAGE NO LOAD APPLICATION INPUT CURRENT vs INPUT VOLTAGE 100 90 40 IO = 10 mA 35 Device Enabled 80 30 IO = 50 mA IO = 100 mA II - Input Current - mA h - Efficiency - % 70 60 50 IO = 1 mA 40 30 25 20 15 10 20 5 10 0 0.8 1.0 1.2 1.4 1.6 1.8 2.0 2.2 2.4 VI - Input Voltage - V 2.6 2.8 3.0 0 0.8 3.2 1.2 1.4 1.6 1.8 2.0 2.2 2.4 VI - Input Voltage - V 2.6 3.0 2.8 Figure 3. Figure 4.
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TLV61225 SLVSAF0 – AUGUST 2010 www.ti.com OUTPUT VOLTAGE vs OUTPUT CURRENT AND INPUT VOLTAGE LINE TRANSIENT RESPONSE VI = 0.9 V, VO = 3.3 V, RLOAD = 150 W VEN 500 mV/div VI Icoil 200 mV/div 100 mA/div Offset: 1.8 V VL 2 V/div VO 20 mV/div Offset: 3.3 V VI 1.8 to 2.4 V, RLOAD = 100 W, trise = tfall = 20 ms 200 ms/div Figure 9. 8 Submit Documentation Feedback VO 2 V/div 500 ms/div Figure 10.
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TLV61225 www.ti.com SLVSAF0 – AUGUST 2010 DETAILED DESCRIPTION OPERATION The TLV61225 is a high performance, high efficient family of switching boost converters. To achieve high efficiency the power stage is implemented as a synchronous boost topology. For the power switching two actively controlled low RDSon power MOSFETs are used. CONTROLLER CIRCUIT The device is controlled by a hysteretic current mode controller.
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TLV61225 SLVSAF0 – AUGUST 2010 www.ti.com Undervoltage Lockout An implemented undervoltage lockout function (UVLO) stops the operation of the converter if the input voltage drops below the typical undervoltage lockout threshold. This function is implemented in order to prevent malfunctioning of the converter and protect batteries against deep discharge.
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TLV61225 www.ti.com SLVSAF0 – AUGUST 2010 APPLICATION INFORMATION DESIGN PROCEDURE The TLV61225 DC/DC converter is intended for systems powered by a single or dual cell Alkaline or NiMH battery with a typical terminal voltage between 0.7 V and 3.3 V. Additionally, any other voltage source with a typical output voltage between 0.7 V and 3.3 V can be used with the TLV61225. Programming the Output Voltage At fixed voltage versions, the output voltage is programmed by an internal resistor divider.
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TLV61225 SLVSAF0 – AUGUST 2010 C2 ³ www.ti.com L ´ 2 (2) 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 paths.
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PACKAGE OPTION ADDENDUM www.ti.
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PACKAGE MATERIALS INFORMATION www.ti.com 31-Dec-2010 TAPE AND REEL INFORMATION *All dimensions are nominal Device Package Package Pins Type Drawing SPQ Reel Reel A0 Diameter Width (mm) (mm) W1 (mm) B0 (mm) K0 (mm) P1 (mm) W Pin1 (mm) Quadrant TLV61225DCKR SC70 DCK 6 3000 179.0 8.4 2.2 2.5 1.2 4.0 8.0 Q3 TLV61225DCKT SC70 DCK 6 250 179.0 8.4 2.2 2.5 1.2 4.0 8.
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PACKAGE MATERIALS INFORMATION www.ti.com 31-Dec-2010 *All dimensions are nominal Device Package Type Package Drawing Pins SPQ Length (mm) Width (mm) Height (mm) TLV61225DCKR SC70 DCK 6 3000 203.0 203.0 35.0 TLV61225DCKT SC70 DCK 6 250 203.0 203.0 35.
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IMPORTANT NOTICE Texas Instruments Incorporated and its subsidiaries (TI) reserve the right to make corrections, modifications, enhancements, improvements, and other changes to its products and services at any time and to discontinue any product or service without notice. Customers should obtain the latest relevant information before placing orders and should verify that such information is current and complete.