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sbas221d ? december 2001 ? revised april 2003 features wide input range: 1.8v to 5.5v automatic step-up/step-down operation low input current ripple low output voltage ripple minimum number of external components ? no inductors 1mhz internal oscillator allows small 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 applications smart card readers sim card supplies cellular phones portable communication devices personal digital assistants notebook and palm-top computers modems electronic games handheld meters pcmcia cards card buses white led drivers lcd displays battery backup supplies 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 65 a with no load, and less than 1 a 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. reg710 used in white led backlight application www.ti.com please be aware that an important notice concerning availability, standard warranty, and use in critical applications of t exas instruments semiconductor products and disclaimers thereto appears at the end of this data sheet. copyright ? 2001?2003, texas instruments incorporated
sbas221d ? december 2001 ? revised april 2003 www.ti.com 2 absolute maximum ratings (1) supply voltage ? 0.3v to +6.0v . . . . . . . . . . . . . . . . . . . . . . . . . . . enable input ? 0.3v to v in . . . . . . . . . . . . . . . . . . . . . . . . . . . . . output short-circuit duration indefinite . . . . . . . . . . . . . . . . . . . . . operating temperature range ? 55 c to +125 c . . . . . . . . . . . . . . . storage temperature range ? 65 c to +150 c . . . . . . . . . . . . . . . . junction temperature ? 55 c to +150 c . . . . . . . . . . . . . . . . . . . . . lead temperature (soldering, 3s) +240 c . . . . . . . . . . . . . . . . . . . note: (1) stresses above these ratings may cause permanent damage. expo- sure to absolute maximum conditions for extended periods may degrade device reliability. electrostatic discharge sensitivity this integrated circuit can be damaged by esd. texas instru- ments 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 product output voltage package-lead package designator (1) specified temperature range package marking (2) ordering number transport media, quantity 5.5v out p ut 55v tsot23 6 ddc 40 cto+85 c r10h reg71055ddct tape and reel, 250 5 . 5v o u tp u t reg71055ddc 5.5v tsot23 ? 6 ddc ? 40 c to +85 c r10h reg71055ddcr tape and reel, 3000 5v out p ut 50v sot23 6 dbv 40 cto+85 c r10b reg710na-5/250 tape and reel, 250 5v o u tp u t reg710na-5 5.0v sot23 ? 6 dbv ? 40 c to +85 c r10b reg710na-5/3k tape and reel, 3000 3.3v out p ut 33v sot23 6 dbv 40 cto+85 c r10c reg710na-3.3/250 tape and reel, 250 3 . 3v o u tp u t reg710na-3.3 3.3v sot23 ? 6 dbv ? 40 c to +85 c r10c reg710na-3.3/3k tape and reel, 3000 3v out p ut 30v sot23 6 dbv 40 cto+85 c r10d reg710na-3/250 tape and reel, 250 3v o u tp u t reg710na-3 3.0v sot23 ? 6 dbv ? 40 c to +85 c r10d reg710na-3/3k tape and reel, 3000 2.7v out p ut 27v sot23 6 dbv 40 cto+85 c r10f reg710na-2.7/250 tape and reel, 250 2 . 7v o u tp u t reg710na-2.7 2.7v sot23 ? 6 dbv ? 40 c to +85 c r10f reg710na-2.7/3k tape and reel, 3000 2.5v out p ut 25v sot23 6 dbv 40 cto+85 c r10g reg710na-2.5/250 tape and reel, 250 2 . 5v o u tp u t reg710na-2.5 2.5v sot23 ? 6 dbv ? 40 c to +85 c r10g 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 b e marked on reel. pin configuration top view tsot23/sot23 simplified block diagram
sbas221d ? december 2001 ? revised april 2003 www.ti.com 3 electrical characteristics boldface limits apply over the specified temperature range, t a = ? 40 c to +85 c at t a = +25 c, v in = v out /2 + 0.75v, i out = 10ma, c in = c out = 2.2 f, c pump = 0.22 f, v enable = 1.3v, unless otherwise noted. parameter conditions reg710na units parameter conditions min typ max units input voltage tested startup reg71055 see conditions under output voltage with a resistive load not lower than ty p ical v out /i out 3.0 5.5 v reg710-5 w i t h a res i st i ve l oa d not l ower t h an typ i ca l v out /i out . 2.7 5.5 v all other models 1.8 5.5 v output voltage reg71055 i out 10ma, 3.0v v in 5.5v 5.2 5.5 5.8 v i out 30ma, 3.25v v in 5.5v 5.2 5.5 5.8 v reg710-5 i out 10ma, 2.7v v in 5.5v 4.7 5.0 5.3 v i out 30ma, 3.0v v in 5.5v 4.7 5.0 5.3 v i out 60ma, 3.3v v in 4.2v 4.6 5.0 5.4 v reg710-3.3 i out 10ma, 1.8v v in 5.5v 3.10 3.3 3.50 v i out 30ma, 2.2v v in 5.5v 3.10 3.3 3.50 v reg710-3 i out 10ma, 1.8v v in 5.5v 2.82 3.0 3.18 v i out 30ma, 2.2v v in 5.5v 2.82 3.0 3.18 v reg710-2.7 i out 10ma, 1.8v v in 5.5v 2.54 2.7 2.86 v i out 30ma, 2.0v v in 5.5v 2.54 2.7 2.86 v reg710-2.5 i out 10ma, 1.8v v in 5.5v 2.35 2.5 2.65 v i out 30ma, 2.0v v in 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) i out = 10ma, v in = 1.8v, reg710 ? 3.3 90 % ripple voltage (4) i out = 30ma 35 mvp ? p enable control v in = 1.8v to 5.5v logic high input voltage 1.3 v in 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) i out = 0ma 65 100 a in shutdown mode v in = 1.8v to 5.5v, enable = 0v 0.01 1 a temperature range specification ambient temperature t a ? 40 +85 c operating ambient temperature t a ? 55 +125 c storage ambient temperature t a ? 65 +150 c thermal resistance, ja 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 freque ncy during an active period. (3) see efficiency curves for other v in /v out configurations. (4) effective series resistance (esr) of capacitors is < 0.1 ? .
sbas221d ? december 2001 ? revised april 2003 www.ti.com 4 typical characteristics at t a = +25 c, v in = v out /2 + 0.75v, i out = 5ma, c in = c out = 2.2 f, c pump = 0.22 f, v enable = 1.3v, unless otherwise noted.
sbas221d ? december 2001 ? revised april 2003 www.ti.com 5 typical characteristics (cont.) at t a = +25 c, v in = v out /2 + 0.75v, i out = 5ma, c in = c out = 2.2 f, c pump = 0.22 f, v enable = 1.3v, unless otherwise noted.
sbas221d ? december 2001 ? revised april 2003 www.ti.com 6 typical characteristics (cont.) at t a = +25 c, v in = v out /2 + 0.75v, i out = 5ma, c in = c out = 2.2 f, c pump = 0.22 f, v enable = 1.3v, unless otherwise noted.
sbas221d ? december 2001 ? revised april 2003 www.ti.com 7 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 au- tomatic 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 opera- tion is shown in figure 1. transistors q 1 and q 3 are held off, q 4 is on, and q 2 is switched as needed to maintain a regu- lated output voltage. 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 c pump charges to v out . during the second half cycle the fet switched are config- ured as shown in figure 2b, and the voltage on c pump is added to v out . 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 cur- rents 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 cur- rent ripple. input capacitor (c in ) supplies most of the charge required by input current peaks. protection the regulator has thermal shutdown circuitry that protects it from damage caused by overload conditions. the ther- mal protection circuitry disables the output when the junc- tion 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 pro- vides current limit to protect itself and the load. shutdown mode a control pin on the regulator can be used to place the de- vice into an energy-saving shutdown mode. in this mode, the output is disconnected from the input as long as v in is greater than or equal to minimum v in and the input quies- cent current is reduced to 1 a maximum. figure 2. simplified schematic of the reg710 operating in the step-up or boost mode
table 1. suggested capacitors sbas221d ? december 2001 ? revised april 2003 www.ti.com 8 capacitor selection for minimum output voltage ripple, the output capacitor c out should be a ceramic, surface-mount type. tantalum capacitors generally have a higher effective series resist- ance (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 (c in and c pump , 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. figure 3. typical operating circuit with light loads or higher input voltage, a smaller 0.1 f pump capacitor (c pump ) and smaller 1 f input and output capacitors (c in and c out , respectively) can be used. to minimize output voltage ripple, increase the output capaci- tor, c out , to 10 f or larger. 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 cur- rent, and the internal operation mode of the device. the approximate efficiency is given by: efficiency (%) = v out /(2 v in ) 100 (step-up operating mode) 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 t ypical characteristics section for various loads and input voltages. table 2. operating mode change versus v in product operating mode product operating mode changes at v in 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 large transient currents flow in the v in , v out , 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. 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. figure 4. suggested pcb design for minimum ripple dielectric package rated manufacturer part number value tolerance dielectric material package size rated working manufacturer part number value tolerance material size working voltage kemet c1206c255k8rac 2.2 f 10% x7r 1206 10v c1206c224k8rac 0.22 f 10% x7r 1206 10v panasonic ecj ? 2yboj225k 2.2 f 10% x5r 805 6.3v ecj ? 2vbic224k 0.22 f 10% x7r 805 16v ecj ? 2vbic104 0.1 f 10% x7r 805 16v taiyo yuden emk316bj225kl 2.2 f 10% x7r 1206 16v tkm316bj224kf 0.22 f 10% x7r 1206 25v
sbas221d ? december 2001 ? revised april 2003 www.ti.com 9 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
sbas221d ? december 2001 ? revised april 2003 www.ti.com 10 figure 8. reg710 with negative bias supply
sbas221d ? december 2001 ? revised april 2003 www.ti.com 11 dbv (r-pdso-g6) plastic small-outline 0,10 m 0,20 0,95 0 ? 8 0,25 0,55 0,35 gage plane 0,15 nom 4073253-5/g 01/02 2,60 3,00 0,50 0,25 1,50 1,70 4 6 3 1 2,80 3,00 1,45 0,95 0,05 min seating plane 6x 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. d. leads 1, 2, 3 may be wider than leads 4, 5, 6 for package orientation.
sbas221d ? december 2001 ? revised april 2003 www.ti.com 12 ddc (r ? pdso ? g6) plastic small-outline 0,20 seating plane 1,00 max 0,84 0,01 0,10 0,90 1 2,90 6 0,95 1,60 3 0,45 0,30 4 2,80 4204403-3/b 07/02 0,25 0,25 0 ? 8 m 0,20 0,12 gage plane 0,30 0,50 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.
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

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