SBAS221D – DECEMBER 2001 – REVISED APRIL 2003 FEATURES D Wide Input Range: 1.8V to 5.5V D Automatic Step-Up/Step-Down Operation D Low Input Current Ripple D Low Output Voltage Ripple D Minimum Number of External ComponentsNo Inductors D 1MHz Internal Oscillator Allows Small D D D D D Capacitors Shutdown Mode Thermal and Current Limit Protection Six Output Voltages Available: 5.5V, 5.0V, 3.3V, 3.0V, 2.7V, 2.5V Small Packages: – SOT23-6 – TSOT23-6 (REG71055 Only) Evaluation Modules Available: REG710EVM-33, REG710EVM-5 DESCRIPTION The REG710 is a switched capacitor voltage converter, that produces a regulated, low-ripple output voltage from an unregulated input voltage. A wide-input supply voltage of 1.8V to 5.5V makes the REG710 ideal for a variety of battery sources, such as single cell Li-Ion, or two and three cell nickel- or alkaline-based chemistries. The input voltage may vary above and below the output voltage and the output will remain in regulation. It works equally well for step-up or step-down applications without the need for an inductor, providing low EMI DC/DC conversion. The high switching frequency allows the use of small surface-mount capacitors, saving board space and reducing cost. The REG710 is thermally protected and current limited, protecting the load and the regulator during fault conditions. Typical ground pin current (quiescent current) is 65µA with no load, and less than 1µA in shutdown mode. The 5.5V version of the REG710 is available in a thin TSOT23-6 package. All other versions are available in a small SOT23-6 package. APPLICATIONS D Smart Card Readers D SIM Card Supplies D Cellular Phones D Portable Communication Devices D Personal Digital Assistants D Notebook and Palm-Top Computers D Modems D Electronic Games D Handheld Meters D PCMCIA Cards D Card Buses D White LED Drivers D LCD Displays D Battery Backup Supplies REG710 Used in White LED Backlight Application 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. Copyright 2001–2003, Texas Instruments Incorporated ! "#$%$" & '%%" & $# '() $" * %$' & $"#$% $ & # $"& % %& $# +& !"&%'"& &"% %%",* %$' $" %$ &&"- $& "$ " &&%), " )' &"- $# )) %%&* www.ti.com www.ti.com SBAS221D – DECEMBER 2001 – REVISED APRIL 2003 ABSOLUTE MAXIMUM RATINGS(1) Supply Voltage . . . . . . . . . . . Enable Input . . . . . . . . . . . . Output Short-Circuit Duration . . Operating Temperature Range . Storage Temperature Range . . Junction Temperature . . . . . . . Lead Temperature (soldering, 3s) . . . . . . . . . . . . . . . . –0.3V to +6.0V . . . . . . . . . . . . . . . . . –0.3V to VIN . . . . . . . . . . . . . . . . . . . Indefinite . . . . . . . . . . . . . . –55°C to +125°C . . . . . . . . . . . . . . –65°C to +150°C . . . . . . . . . . . . . . –55°C to +150°C . . . . . . . . . . . . . . . . . . . +240°C NOTE: (1) Stresses above these ratings may cause permanent damage. Exposure to absolute maximum conditions for extended periods may degrade device reliability. ELECTROSTATIC DISCHARGE SENSITIVITY 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. Precision integrated circuits may be more susceptible to damage because very small parametric changes could cause the device not to meet its published specifications. PACKAGE ORDERING INFORMATION OUTPUT VOLTAGE PACKAGE-LEAD PACKAGE DESIGNATOR(1) SPECIFIED TEMPERATURE RANGE PACKAGE MARKING(2) 5.5V Output REG71055DDC 5 5V 5.5V TSOT23 6 TSOT23–6 DDC –40°C 40°C to +85°C R10H 5V Output REG710NA-5 5 0V 5.0V SOT23 6 SOT23–6 DBV 40°C to +85°C –40°C R10B 3.3V Output REG710NA-3.3 3 3V 3.3V SOT23 6 SOT23–6 DBV –40°C 40°C to +85°C R10C 3V Output REG710NA-3 3 0V 3.0V SOT23 6 SOT23–6 DBV 40°C to +85°C –40°C R10D 2.7V Output REG710NA-2.7 2 7V 2.7V SOT23 6 SOT23–6 DBV –40°C 40°C to +85°C R10F 2.5V Output REG710NA-2.5 2 5V 2.5V SOT23 6 SOT23–6 DBV –40°C 40°C to +85°C R10G PRODUCT ORDERING NUMBER TRANSPORT MEDIA, QUANTITY REG71055DDCT Tape and Reel, 250 REG71055DDCR Tape and Reel, 3000 REG710NA-5/250 Tape and Reel, 250 REG710NA-5/3K Tape and Reel, 3000 REG710NA-3.3/250 Tape and Reel, 250 REG710NA-3.3/3K Tape and Reel, 3000 REG710NA-3/250 Tape and Reel, 250 REG710NA-3/3K Tape and Reel, 3000 REG710NA-2.7/250 Tape and Reel, 250 REG710NA-2.7/3K Tape and Reel, 3000 REG710NA-2.5/250 Tape and Reel, 250 REG710NA-2.5/3K Tape and Reel, 3000 NOTES: (1) For the most current specifications and product information, refer to our web site at www.ti.com. (2) Voltage will be marked on reel. SIMPLIFIED BLOCK DIAGRAM PIN CONFIGURATION Top View 2 TSOT23/SOT23 www.ti.com SBAS221D – DECEMBER 2001 – REVISED APRIL 2003 ELECTRICAL CHARACTERISTICS Boldface limits apply over the specified temperature range, TA = –40 C to +85 C At TA = +25°C, VIN = VOUT/2 + 0.75V, IOUT = 10mA, CIN = COUT = 2.2µF, CPUMP = 0.22µF, VENABLE = 1.3V, unless otherwise noted. REG710NA PARAMETER CONDITIONS MIN TYP MAX UNITS INPUT VOLTAGE Tested Startup See conditions under Output Voltage with a resistive load not lower than typical VOUT/IOUT. REG71055 REG710-5 All Other Models 3.0 5.5 V 2.7 5.5 V 1.8 5.5 V OUTPUT VOLTAGE REG71055 REG710-5 REG710-3.3 REG710-3 REG710-2.7 REG710-2.5 IOUT ≤ 10mA, 3.0V ≤ VIN ≤ 5.5V 5.2 5.5 5.8 V IOUT ≤ 30mA, 3.25V ≤ VIN ≤ 5.5V 5.2 5.5 5.8 V IOUT ≤ 10mA, 2.7V ≤ VIN ≤ 5.5V 4.7 5.0 5.3 V IOUT ≤ 30mA, 3.0V ≤ VIN ≤ 5.5V 4.7 5.0 5.3 V IOUT ≤ 60mA, 3.3V ≤ VIN ≤ 4.2V 4.6 5.0 5.4 V IOUT ≤ 10mA, 1.8V ≤ VIN ≤ 5.5V 3.10 3.3 3.50 V IOUT ≤ 30mA, 2.2V ≤ VIN ≤ 5.5V 3.10 3.3 3.50 V IOUT ≤ 10mA, 1.8V ≤ VIN ≤ 5.5V 2.82 3.0 3.18 V IOUT ≤ 30mA, 2.2V ≤ VIN ≤ 5.5V 2.82 3.0 3.18 V IOUT ≤ 10mA, 1.8V ≤ VIN ≤ 5.5V 2.54 2.7 2.86 V IOUT ≤ 30mA, 2.0V ≤ VIN ≤ 5.5V 2.54 2.7 2.86 V IOUT ≤ 10mA, 1.8V ≤ VIN ≤ 5.5V 2.35 2.5 2.65 V IOUT ≤ 30mA, 2.0V ≤ VIN ≤ 5.5V 2.35 2.5 2.65 V OUTPUT CURRENT Nominal 30 mA Short Circuit(1) 100 mA OSCILLATOR FREQUENCY(2) 1.0 MHz EFFICIENCY(3) IOUT = 10mA, VIN = 1.8V, REG710–3.3 90 % RIPPLE VOLTAGE(4) IOUT = 30mA 35 mVp–p ENABLE CONTROL VIN = 1.8V to 5.5V Logic High Input Voltage 1.3 VIN V Logic Low Input Voltage –0.2 0.4 V Logic High Input Current 100 nA Logic Low Input Current 100 nA THERMAL SHUTDOWN Shutdown Temperature 160 °C Shutdown Recovery 140 °C SUPPLY CURRENT (Quiescent Current) IOUT = 0mA 65 100 µA In Shutdown Mode VIN = 1.8V to 5.5V, Enable = 0V 0.01 1 µA TEMPERATURE RANGE Specification Ambient Temperature TA –40 +85 °C Operating Ambient Temperature TA –55 +125 °C Storage Ambient Temperature TA –65 +150 Thermal Resistance, JA °C SOT23–6 200 °C/W TSOT23–6 220 °C/W (1) The supply current is twice the output short-circuit current. (2) The converter regulates by enabling and disabling periods of switching cycles. The switching frequency is the oscillator frequency during an active period. (3) See efficiency curves for other VIN/VOUT configurations. (4) Effective Series Resistance (ESR) of capacitors is < 0.1Ω. 3 www.ti.com SBAS221D – DECEMBER 2001 – REVISED APRIL 2003 TYPICAL CHARACTERISTICS At TA = +25°C, VIN = VOUT/2 + 0.75V, IOUT = 5mA, CIN = COUT = 2.2µF, CPUMP = 0.22µF, VENABLE = 1.3V, unless otherwise noted. 4 www.ti.com SBAS221D – DECEMBER 2001 – REVISED APRIL 2003 TYPICAL CHARACTERISTICS (Cont.) At TA = +25°C, VIN = VOUT/2 + 0.75V, IOUT = 5mA, CIN = COUT = 2.2µF, CPUMP = 0.22µF, VENABLE = 1.3V, unless otherwise noted. 5 www.ti.com SBAS221D – DECEMBER 2001 – REVISED APRIL 2003 TYPICAL CHARACTERISTICS (Cont.) At TA = +25°C, VIN = VOUT/2 + 0.75V, IOUT = 5mA, CIN = COUT = 2.2µF, CPUMP = 0.22µF, VENABLE = 1.3V, unless otherwise noted. 6 www.ti.com SBAS221D – DECEMBER 2001 – REVISED APRIL 2003 THEORY OF OPERATION The REG710 regulated charge pump provides a regulated output voltage for input voltages ranging from less than the output to greater than the output. This is accomplished by automatic mode switching within the device. When the input voltage is greater than the required output, the unit functions as a variable frequency switch-mode regulator. This operation is shown in Figure 1. Transistors Q1 and Q3 are held off, Q4 is on, and Q2 is switched as needed to maintain a regulated output voltage. During the second half cycle the FET switched are configured as shown in Figure 2B, and the voltage on CPUMP is added to VOUT. The output voltage is regulated by skipping clock cycles as necessary. PEAK CURRENT REDUCTION In normal operation, the charging of the pump and output capacitors usually leads to relatively high peak input currents which can be much higher than that of the average load current. The regulator incorporates circuitry to limit the input peak current, lowering the total EMI production of the device and lowering output voltage ripple and input current ripple. Input capacitor (CIN) supplies most of the charge required by input current peaks. PROTECTION Figure 1. Simplified Schematic of the REG710 Operating in the Step-Down Mode When the input voltage is less than the required output voltage, the device switches to a step-up or boost mode of operation, as shown in Figure 2. A conversion clock of 50% duty cycle is generated. During the first half cycle the FET switches are configured as shown in Figure 2A, and CPUMP charges to VOUT. The regulator has thermal shutdown circuitry that protects it from damage caused by overload conditions. The thermal protection circuitry disables the output when the junction temperature reached approximately 160°C, allowing the device to cool. When the junction temperature cools to approximately 140°C, the output circuitry is automatically reenabled. Continuously running the regulator into thermal shutdown can degrade reliability. The regulator also provides current limit to protect itself and the load. SHUTDOWN MODE A control pin on the regulator can be used to place the device into an energy-saving shutdown mode. In this mode, the output is disconnected from the input as long as VIN is greater than or equal to minimum VIN and the input quiescent current is reduced to 1µA maximum. Figure 2. Simplified Schematic of the REG710 Operating in the Step-Up or Boost Mode 7 www.ti.com SBAS221D – DECEMBER 2001 – REVISED APRIL 2003 The approximate efficiency is given by: Efficiency (%) = VOUT/(2 × VIN) × 100 (step-up operating mode) CAPACITOR SELECTION For minimum output voltage ripple, the output capacitor COUT should be a ceramic, surface-mount type. Tantalum capacitors generally have a higher Effective Series Resistance (ESR) and may contribute to higher output voltage ripple. Leaded capacitors also increase ripple due to the higher inductance of the package itself. To achieve best operation with low input voltage and high load current, the input and pump capacitors (CIN and CPUMP, respectively) should also be surface-mount ceramic types. In all cases, X7R or X5R dielectric are recommended. See the typical operating circuit shown in Figure 3 for component values. or V OUT V IN 100 (step-down operating mode) Table 2 lists the approximate values of the input voltage at which the device changes internal operating mode. See efficiency curves in the Typical Characteristics section for various loads and input voltages. Table 2. Operating Mode Change Versus VIN PRODUCT OPERATING MODE CHANGES AT VIN OF REG710-2.5 > 3.2V REG710-2.7 > 3.4V REG710-3 > 3.7V REG710-3.3 > 4.0V REG710-5 Step-Up Only LAYOUT Figure 3. Typical Operating Circuit Large transient currents flow in the VIN, VOUT, and GND traces. To minimize both input and output ripple, keep the capacitors as close as possible to the regulator using short, direct circuit traces. With light loads or higher input voltage, a smaller 0.1µF pump capacitor (CPUMP) and smaller 1µF input and output capacitors (CIN and COUT, respectively) can be used. To minimize output voltage ripple, increase the output capacitor, COUT, to 10µF or larger. A suggested PCB routing is shown in Figure 4. The trace lengths from the input and output capacitors have been kept as short as possible. The capacitors listed in Table 1 can be used with the REG710. This is only a representative list of those parts that are compatible. EFFICIENCY The efficiency of the charge pump regulator varies with the output voltage version, the applied input voltage, the load current, and the internal operation mode of the device. Figure 4. Suggested PCB Design for Minimum Ripple Table 1. Suggested Capacitors PART NUMBER VALUE TOLERANCE DIELECTRIC MATERIAL PACKAGE SIZE RATED WORKING VOLTAGE C1206C255K8RAC C1206C224K8RAC 2.2µF 0.22µF ±10% ±10% X7R X7R 1206 1206 10V 10V Panasonic ECJ–2YBOJ225K ECJ–2VBIC224K ECJ–2VBIC104 2.2µF 0.22µF 0.1µF ±10% ±10% ±10% X5R X7R X7R 805 805 805 6.3V 16V 16V Taiyo Yuden EMK316BJ225KL TKM316BJ224KF 2.2µF 0.22µF ±10% ±10% X7R X7R 1206 1206 16V 25V MANUFACTURER Kemet 8 www.ti.com SBAS221D – DECEMBER 2001 – REVISED APRIL 2003 APPLICATION CIRCUITS Figure 5. REG710 Circuit for Step-Up Operation from 1.8V to 5.0V with 10mA Output Current Figure 6. REG710 Circuit for Doubling the Output Current Figure 7. REG710 Circuit for Driving LEDs 9 www.ti.com SBAS221D – DECEMBER 2001 – REVISED APRIL 2003 Figure 8. REG710 with Negative Bias Supply 10 www.ti.com SBAS221D – DECEMBER 2001 – REVISED APRIL 2003 DBV (R-PDSO-G6) PLASTIC SMALL-OUTLINE 0,95 6X 6 0,50 0,25 0,20 M 4 1,70 1,50 1 0,15 NOM 3,00 2,60 3 Gage Plane 3,00 2,80 0,25 0°–8° 0,55 0,35 Seating Plane 1,45 0,95 0,05 MIN 0,10 4073253-5/G 01/02 NOTES: A. B. C. D. All linear dimensions are in millimeters. This drawing is subject to change without notice. Body dimensions do not include mold flash or protrusion. Leads 1, 2, 3 may be wider than leads 4, 5, 6 for package orientation. 11 www.ti.com SBAS221D – DECEMBER 2001 – REVISED APRIL 2003 DDC (R–PDSO–G6) PLASTIC SMALL-OUTLINE 0,45 0,30 0,95 6 0,20 M 4 0,20 0,12 2,80 1,60 Gage Plane 1 3 0,25 2,90 0°– 8° 0,50 0,30 0,90 0,84 1,00 MAX Seating Plane 0,10 0,01 0,25 4204403-3/B 07/02 NOTES: A. All linear dimensions are in millimeters. B. This drawing is subject to change without notice. C. Body dimensions do not include mold flash or protrusion. 12 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. All products are sold subject to TI’s terms and conditions of sale supplied at the time of order acknowledgment. TI warrants performance of its hardware products to the specifications applicable at the time of sale in accordance with TI’s standard warranty. Testing and other quality control techniques are used to the extent TI deems necessary to support this warranty. Except where mandated by government requirements, testing of all parameters of each product is not necessarily performed. TI assumes no liability for applications assistance or customer product design. Customers are responsible for their products and applications using TI components. To minimize the risks associated with customer products and applications, customers should provide adequate design and operating safeguards. TI does not warrant or represent that any license, either express or implied, is granted under any TI patent right, copyright, mask work right, or other TI intellectual property right relating to any combination, machine, or process in which TI products or services are used. Information published by TI regarding third–party products or services does not constitute a license from TI to use such products or services or a warranty or endorsement thereof. Use of such information may require a license from a third party under the patents or other intellectual property of the third party, or a license from TI under the patents or other intellectual property of TI. Reproduction of information in TI data books or data sheets is permissible only if reproduction is without alteration and is accompanied by all associated warranties, conditions, limitations, and notices. Reproduction of this information with alteration is an unfair and deceptive business practice. TI is not responsible or liable for such altered documentation. Resale of TI products or services with statements different from or beyond the parameters stated by TI for that product or service voids all express and any implied warranties for the associated TI product or service and is an unfair and deceptive business practice. TI is not responsible or liable for any such statements. Mailing Address: Texas Instruments Post Office Box 655303 Dallas, Texas 75265 Copyright 2003, Texas Instruments Incorporated