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the information in this document is subject to change without notice. before using this document, please confirm that this is the latest version. not all products and/or types are available in every country. please check with an nec electronics sales representative for availability and additional information. 2000, 2001, 2007 bipolar analog integrated circuit pc2918, 2925, 2926 three-terminal low drop out voltage regulator data sheet document no. g14983ej5v0ds00 (5th edition) date published august 2007 ns printed in japan the mark shows major revised points. the revised points can be easily searched by copying an "" in the pdf file and specifying it in the "find what:" field. description the pc2918, 2925 and 2926 are three-terminal low dro pout voltage regulators with the 1-a output. the pc2918 outputs 1.8 v, the pc2925 outputs 2.5 v and the pc2926 outputs 2.6 v. since these regulators use a pnp transistor for the output stag e, they achieve a low dropout voltage of 0.7 v typ. at i o = 1 a and minimize the power dissipation of the ic. as a result, these regulators c an be used to realize sets with lower voltage and power dissipation. features ? output current capacity: 1 a ? low dropout voltage v dif = 0.5 v max. (i o = 0.5 a) ? output voltage accuracy: v o 2% ? on-chip saturation protector rising edge of input voltage (at low input voltage) ? on-chip over-current limi ter and thermal protection ? on-chip output transistor sa fe operation area protection pin configurations (marking side) notes 1. no.2 pin and no.4 fin are common gnd. 2. no.2 pin is cut. no.2 pin and no.4 fin are common gnd. pc2918hf, pc2925hf, pc2926hf: isolated to-220 (mp-45g) pc2918hb, pc2925hb, pc2926hb: sc-64 (mp-3) pc2918t, pc2925t, pc2926t: sc-63 (mp-3z) 3 2 1 1: input 2: gnd 3: output 4 3 2 1 1: input 2: gnd 3: output 4: gnd (fi n) note1 4 3 2 1 1: input 2: gnd 3: output 4: gnd (fin) note2
data sheet g14983ej5v0ds 2 pc2918, 2925, 2926 block diagram start-up circuit reference voltage thermal shut down error amp. drive circuit saturation protection safe operating area protection output gnd input over-current protection
data sheet g14983ej5v0ds 3 pc2918, 2925, 2926 ordering information part number package output voltage marking pc2918hf isolated to-220 (mp-45g) 1.8 v 2918 pc2918hb sc-64 (mp-3) 1.8 v 2918 pc2918t sc-63 (mp-3z) 1.8 v 2918 pc2925hf isolated to-220 (mp-45g) 2.5 v 2925 pc2925hb sc-64 (mp-3) 2.5 v 2925 pc2925t sc-63 (mp-3z) 2.5 v 2925 pc2926hf isolated to-220 (mp-45g) 2.6 v 2926 pc2926hb sc-64 (mp-3) 2.6 v 2926 pc2926t sc-63 (mp-3z) 2.6 v 2926 remark tape-packaged products have the symbol -e1, or -e2 suffixed to the part number. pb-free products have the symbol -az, or -ay suffixed to the part nu mber. refer to the following table for details. part number note1 package package type pc29xxhf isolated to-220 (mp-45g) ? packed in envelop pc29xxhf-az note2 isolated to-220 (mp-45g) ? packed in envelop pc29xxhb sc-64 (mp-3) ? packed in envelop pc29xxhb-az note2 sc-64 (mp-3) ? packed in envelop pc29xxhb-ay note3 sc-64 (mp-3) ? packed in envelop pc29xxt-e1 sc-63 (mp-3z) ? 16 mm wide embossed taping ? pin 1 on draw-out side ? 2000 pcs/reel pc29xxt-e1-az note2 sc-63 (mp-3z) ? 16 mm wide embossed taping ? pin 1 on draw-out side ? 2000 pcs/reel pc29xxt-e1-ay note3 sc-63 (mp-3z) ? 16 mm wide embossed taping ? pin 1 on draw-out side ? 2000 pcs/reel pc29xxt-e2 sc-63 (mp-3z) ? 16 mm wide embossed taping ? pin 1 at take-up side ? 2000 pcs/reel pc29xxt-e2-az note2 sc-63 (mp-3z) ? 16 mm wide embossed taping ? pin 1 at take-up side ? 2000 pcs/reel pc29xxt-e2-ay note3 sc-63 (mp-3z) ? 16 mm wide embossed taping ? pin 1 at take-up side ? 2000 pcs/reel notes 1. xx stands for symbols that indicate the output voltage. 2. pb-free (this product does not contai n pb in the external electrode.) 3. pb-free (this product does not contain pb in the external electrode, sn100% plating.)
data sheet g14983ej5v0ds 4 pc2918, 2925, 2926 absolute maximum ratings (t a = 25 c, unless otherwise specified) rating parameter symbol pc2918hf, pc2925hf, pc2926hf pc2918hb, pc2925hb, pc2926hb, pc2918t, pc2925t, pc2926t unit input voltage v in 20 v internal power dissipation (t c = 25 c) note p t 15 10 w operating ambient temperature t a ? 30 to + 85 c operating junction temperature t j ? 30 to + 150 c storage temperature t stg ? 55 to + 150 c thermal resistance (junction to case) r th(j-c) 7 12.5 c/w thermal resistance (junction to ambient) r th(j-a) 65 125 c/w note internally limited. when the operati ng junction temperature rises above 150 c, the internal circuit shuts down the output voltage. caution product quality may suffer if the absolute maximum rating is exceeded even momentarily for any parameter. that is, the absolute maximum ratings are rated values at which the product is on the verge of suffering physical damage, and therefore the product must be used under conditions that ensure that the absolute maximum ratings are not exceeded. typical connection + d 2 d 1 c in c out input output pc2918, 2925, 2926 c in : 0.1 f or higher. be sure to connect c in to prevent parasitic oscillation. set this value according to the length of the line between the regulator and the input pin. use of a film capacitor or other capacitor with first-rate voltage and temperature characteristics is recommended . if using a laminated ceramic capacitor, it is necessary to ensure that c in is 0.1 f or higher for the voltage and temperature range to be used. c out : 10 f or higher. be sure to connect c out to prevent oscillation and improve excessive load regulation. place c in and c out as close as possible to the ic pins (within 1 to 2 cm). also, use an electrolytic capacitor with low impedance characteristics if consider ing use at sub-zero temperatures. d 1 : if the output pin has a higher voltage than the input pin, connect a diode. d 2 : if the output pin has a lower voltage than the gnd pin, connect a schottky barrier diode. caution make sure that no voltage is applied to the output pin from external.
data sheet g14983ej5v0ds 5 pc2918, 2925, 2926 recommended operating conditions parameter symbol type number min. typ. max. unit pc2918 2.8 16 v pc2925 3.5 16 v input voltage v in pc2926 3.6 16 v output current i o all 0 1 a operating ambient temperature t a all ? 30 + 85 c operating junction temperature t j all ? 30 + 125 c caution use of conditions other than the above-liste d recommended operating conditions is not a problem as long as the absolute maximum ratings are not exceeded. however, since the use of such conditions diminishes the margin of safety, careful evaluation is required before such conditions are used. moreover, using the max. value for al l the recommended operating conditions is not guaranteed to be safe. electrical characteristics pc2918 (t j = 25 c, v in = 2.8 v, i o = 0.5 a, c in = 0.1 f, c out = 10 f, unless otherwise specified) parameter symbol conditions min. typ. max. unit 1.764 1.8 1.836 v output voltage v o 2.8 v v in 5 v, 0 a i o 1 a, 0 c t j 125 c (1.71) (1.854) v line regulation reg in 2.8 v v in 16 v 6 25 mv load regulation reg l 0 a i o 1 a 7 30 mv i o = 0 a 2 4 ma quiescent current i bias i o = 1 a 20 60 ma v in = 2.4 v, i o = 0 a 10 30 ma startup quiescent current i bias(s) v in = 2.4 v, i o = 1 a 80 ma quiescent current change i bias 2.8 v v in 16 v, 0 c t j 125 c 2.9 20 ma output noise voltage v n 10 hz f 100 khz 40 v r.m.s. ripple rejection r?r f = 120 hz, 2.8 v v in 9 v 45 60 db i o = 0.5 a 0.25 0.5 v dropout voltage v dif i o = 1 a, 0 c t j 125 c 0.7 v v in = 2.8 v 1.2 1.7 3.0 a short circuit current i oshort v in = 16 v 1.2 a v in = 2.8 v 1.0 1.5 3.0 a peak output current i opeak v in = 16 v 1.1 a temperature coefficient of output voltage v o / t i o = 5 ma, 0 c t j 125 c ? 0.4 mv/ c remark values in parentheses have been measured during pr oduct design and are provided as reference values.
data sheet g14983ej5v0ds 6 pc2918, 2925, 2926 pc2925 (t j = 25 c, v in = 3.5 v, i o = 0.5 a, c in = 0.1 f, c out = 10 f, unless otherwise specified) parameter symbol conditions min. typ. max. unit 2.45 2.5 2.55 v output voltage v o 3.5 v v in 5 v, 0 a i o 1 a, 0 c t j 125 c (2.375) (2.575) v line regulation reg in 3.5 v v in 16 v 6 25 mv load regulation reg l 0 a i o 1 a 7 30 mv i o = 0 a 2 4 ma quiescent current i bias i o = 1 a 20 60 ma v in = 2.4 v, i o = 0 a 10 30 ma startup quiescent current i bias(s) v in = 3.0 v, i o = 1 a 80 ma quiescent current change i bias 3.5 v v in 16 v, 0 c t j 125 c 2.9 20 ma output noise voltage v n 10 hz f 100 khz 40 v r.m.s. ripple rejection r?r f = 120 hz, 3.5 v v in 9 v 45 60 db i o = 0.5 a 0.25 0.5 v dropout voltage v dif i o = 1 a, 0 c t j 125 c 0.7 v v in = 3.5 v 1.2 1.7 3.0 a short circuit current i oshort v in = 16 v 1.2 a v in = 3.5 v 1.0 1.5 3.0 a peak output current i opeak v in = 16 v 1.1 a temperature coefficient of output voltage v o / t i o = 5 ma, 0 c t j 125 c ? 0.5 mv/ c remark values in parentheses have been measured during pr oduct design and are provided as reference values. pc2926 (t j = 25 c, v in = 3.6 v, i o = 0.5 a, c in = 0.1 f, c out = 10 f, unless otherwise specified) parameter symbol conditions min. typ. max. unit 2.548 2.6 2.652 v output voltage v o 3.6 v v in 5 v, 0 a i o 1 a, 0 c t j 125 c (2.470) (2.678) v line regulation reg in 3.6 v v in 16 v 6 25 mv load regulation reg l 0 a i o 1 a 7 30 mv i o = 0 a 2 4 ma quiescent current i bias i o = 1 a 20 60 ma v in = 2.4 v, i o = 0 a 10 30 ma startup quiescent current i bias(s) v in = 3.0 v, i o = 1 a 80 ma quiescent current change i bias 3.6 v v in 16 v, 0 c t j 125 c 2.9 20 ma output noise voltage v n 10 hz f 100 khz 40 v r.m.s. ripple rejection r?r f = 120 hz, 3.6 v v in 9 v 45 60 db i o = 0.5 a 0.25 0.5 v dropout voltage v dif i o = 1 a, 0 c t j 125 c 0.7 v v in = 3.6 v 1.2 1.7 3.0 a short circuit current i oshort v in = 16 v 1.2 a v in = 3.6 v 1.0 1.5 3.0 a peak output current i opeak v in = 16 v 1.1 a temperature coefficient of output voltage v o / t i o = 5 ma, 0 c t j 125 c ? 0.5 mv/ c remark values in parentheses have been measured during pr oduct design and are provided as reference values.
data sheet g14983ej5v0ds 7 pc2918, 2925, 2926 typical characteristics (reference values) 50 85 100 150 5 10 15 20 0 1.0 1.92 p d - total power dissipation - w t a - operating ambient temperature - ?c 0 p d vs. t a solid line: pc29xxhf broken line: pc29xxhb, pc29xxt with infinite heatsink without heatsink 50 25 0 ? 25 ? 50 0 100 150 i o = 5 ma ? 50 50 pc2925 pc2918 v o vs. t j v o - output voltage change - mv t j - operating junction temperature - c 2.0 1.5 1.0 0.5 0 i o = 5 ma 0 1 2 3 4 5 6 7 8 i o = 0.5 a i o = 1 a t j = 25?c v o vs. v in ( pc2918) v o - output voltage - v v in - input voltage - v 50 40 30 20 10 0 0 5 10 15 20 i o = 0 a i o = 1 a i o = 0.5 a t j = 25?c i bias (i bias(s) ) vs. v in ( pc2918) i bias - quiescent current - ma v in - input voltage - v 3.0 2.0 1.0 0 i o = 5 ma 0 1 2 3 4 5 6 7 8 i o = 0.5 a i o = 1 a t j = 25?c v o - output voltage - v v in - input voltage - v v o vs. v in ( pc2925) 50 40 30 20 10 0 0 5 10 15 20 i o = 0 a i o = 1 a i o = 0.5 a t j = 25?c i bias (i bias(s) ) vs. v in ( pc2925) i bias - quiescent current - ma v in - input voltage - v
data sheet g14983ej5v0ds 8 pc2918, 2925, 2926 1 0.8 0.6 0.4 0.2 0 ? 25 125 0 150 75 100 50 25 i o = 1 a v dif vs. t j v dif - dropout voltage - v t j - operating junction temperature - c 2.5 2 1.5 1 0.5 0 t j = 0?c t j = 125?c t j = 25?c 0 51015 20 i opeak vs. v dif ( pc2918) i opeak - peak output current - a v dif - dropout voltage - v 2.5 2 1.5 1 0.5 0 t j = 0?c t j = 125?c t j = 25?c 0 51015 20 i opeak vs. v dif ( pc2925) v dif - dropout voltage - v i opeak - peak output current - a 70 60 50 40 30 20 10 0 100 1000 10000 100000 10 t j = 25? c i o = 1 a pc2918 pc2925 r r vs. f r r - ripple rejection - db f - frequency - hz 80 70 30 0.2 0.4 0.6 1 0.8 0 60 50 40 i o - output current - a t j = 25?c, f = 120 hz 2.8 v v in 9 v ( pc2918) 3.5 v v in 9 v ( pc2925) pc2918 pc2925 r r vs. i o r r - ripple rejection - db 1 0 0.2 0.4 0.6 1 0.8 0.6 0.4 0.2 0 0.8 t j = 25?c v dif vs. i o v dif - dropout voltage - v i o - output current - a
data sheet g14983ej5v0ds 9 pc2918, 2925, 2926 2 1.8 1.6 1.4 1.2 1 0.8 0.6 0.4 0.2 0 0.5 1 1.5 2 2.5 t j = 25?c 0 v in = 5 v v in = 16 v v in = 2.8 v v o vs. i o ( pc2918) v o - output voltage - v i o - output current - a 3 2.5 2 1.5 1 0.5 0 0.5 1 1.5 2 2.5 t j = 25?c 0 v in = 16 v v in = 3.5 v v in = 5 v v o vs. i o ( pc2925) v o - output voltage - v i o - output current - a
data sheet g14983ej5v0ds 10 pc2918, 2925, 2926 package drawings pc2918hf, pc2925hf, pc2926hf d 17.0 0.3 3pin plastic sip (mp-45g) note each lead centerline is located within 0.25 mm of its true position (t.p.) at maximum material condition. item millimeters p3hf-254b-4 g 0.25 h 2.54 (t.p.) a 10.0 0.2 i 5.0 0.3 u 2.4 0.5 v y 8.9 0.7 z 1.30 0.2 j k l 8.5 0.2 b 7.0 0.2 c 1.50 0.2 e f 0.75 0.10 m 8.5 0.2 n p 2.8 0.2 3.3 0.2 2.46 0.2 5.0 0.2 4.5 0.2 0.65 0.10 13 2 m a b e i d l m k y j h c fg z n p u v
data sheet g14983ej5v0ds 11 pc2918, 2925, 2926 pc2918hb, pc2925hb, pc2926hb sc-64 (mp-3) (unit: mm) 123 4 2.3 2.3 0.75 1.1 0.1 0.5 1.6 0.2 5.0 0.2 6.5 0.2 5.5 0.2 7.0 min. + 0.2 ? 0.1 1.5 + 0.2 ? 0.1 13.7 min. 2.3 0.2 0.5 0.1 0.5 + 0.2 ? 0.1 pc2918t, pc2925t, pc2926t sc-63 (mp-3z) (unit: mm) 1 23 4 6.5 0.2 4.4 0.2 5.0 0.2 0.5 0.1 0.5 0.1 2.3 0.3 2.3 0.3 5.6 0.3 9.5 0.5 2.5 0.5 1.0 0.5 5.5 0.2 1.5 +0.2 2.3 0.2 0.5 0.1 note note 0.4 min. 0.5 typ. 0.15 0.15 ? 0.1 note the depth of notch at the top of the fin is from 0 to 0.2 mm.
data sheet g14983ej5v0ds 12 pc2918, 2925, 2926 recommended soldering conditions the pc2918, 2925 and 2926 should be soldered and moun ted under the following recommended conditions. for soldering methods and conditions other than th ose recommended below, contact an nec electronics sales representative. for technical information, see the following website. semiconductor device mount manual (http: //www.necel.com/pkg/en/mount/index.html) surface mount device pc29xxt series: sc-63 (mp-3z) process conditions symbol infrared ray reflow peak temperature: 235 c or below (package surface temperature), reflow time: 30 seconds or less (at 210 c or higher), maximum number of reflow processes: 3 times or less. ir35-00-3 vapor phase soldering peak temperature: 215 c or below (package surface temperature), reflow time: 40 seconds or less (at 200 c or higher), maximum number of reflow processes: 3 times or less. vp15-00-3 partial heating method pin temperature: 350 c or below, heat time: 3 seconds or less (per each side of the device). p350 pc29xxt-az series note1 , pc29xxt-ay series note2 : sc-63 (mp-3z) process conditions symbol infrared ray reflow peak temperature: 260 c or below (package surface temperature), reflow time: 60 seconds or less (at 220 c or higher), maximum number of reflow processes: 3 times or less. ir60-00-3 partial heating method pin temperature: 350 c or below, heat time: 3 seconds or less (per each side of the device). p350 notes 1. pb-free (this product does not cont ain pb in the external electrode.) 2. pb-free (this product does not contain pb in the external electrode, sn100% plating.) caution apply only one kind of soldering condition to a device, except for "partial heating method", or the device will be damaged by heat stress. remark flux: rosin-based flux with low chlorine cont ent (chlorine 0.2 wt% or below) is recommended.
data sheet g14983ej5v0ds 13 pc2918, 2925, 2926 through-hole devices pc29xxhf series, pc29xxhf-az series note1 : isolated to-220 (mp-45g) pc29xxhb series, pc29xxhb-az series note1 , pc29xxhb-ay series note2 : sc-64 (mp-3) process conditions symbol wave soldering (only to leads) solder temperature: 260 c or below, flow time: 10 seconds or less. ws60-00-1 partial heating method pin temperature: 350 c or below, heat time: 3 seconds or less (per each pin). p350 notes 1. pb-free (this product does not cont ain pb in the external electrode.) 2. pb-free (this product does not contain pb in the external electrode, sn100% plating.) caution for through-hole device, the wave soldering process must be applied only to leads, and make sure that the package body does not get jet soldered. notes on use when the pc2918, 2925 and 2926 are used with an input voltage that is lower than the value indicated in the recommended operating conditions, a high quiescent curr ent flows through the device due to saturation of the transistor of the output stage. (refer to the ? i bias (i bias(s) ) vs. v in curves in typical characteristics ?). these products have saturation protec tor, but a current of up to 80 ma max. may flow through the device. thus the power supply on the input side must have sufficient capacit y to allow this quiescent current to pass when the device starts up. reference documents user?s manual usage of three terminal regulators document no.g12702e information voltage regulator of smd document no.g11872e review of quality and reliability handbook document no.c12769e semiconductor device mount manual http://www.necel.com/pkg/en/mount/index.html
pc2918, 2925, 2926 the information in this document is current as of august, 2007. the information is subject to change without notice. for actual design-in, refer to the latest publications of nec electronics data sheets or data books, etc., for the most up-to-date specifications of nec electronics products. not all products and/or types are available in every country. please check with an nec electronics sales representative for availability and additional information. no part of this document may be copied or reproduced in any form or by any means without the prior written consent of nec electronics. nec electronics assumes no responsibility for any errors that may appear in this document. nec electronics does not assume any liability for infringement of patents, copyrights or other intellectual property rights of third parties by or arising from the use of nec electronics products listed in this document or any other liability arising from the use of such products. no license, express, implied or otherwise, is granted under any patents, copyrights or other intellectual property rights of nec electronics or others. descriptions of circuits, software and other related information in this document are provided for illustrative purposes in semiconductor product operation and application examples. the incorporation of these circuits, software and information in the design of a customer's equipment shall be done under the full responsibility of the customer. nec electronics assumes no responsibility for any losses incurred by customers or third parties arising from the use of these circuits, software and information. while nec electronics endeavors to enhance the quality, reliability and safety of nec electronics products, customers agree and acknowledge that the possibility of defects thereof cannot be eliminated entirely. to minimize risks of damage to property or injury (including death) to persons arising from defects in nec electronics products, customers must incorporate sufficient safety measures in their design, such as redundancy, fire-containment and anti-failure features. nec electronics products are classified into the following three quality grades: "standard", "special" and "specific". the "specific" quality grade applies only to nec electronics products developed based on a customer- designated "quality assurance program" for a specific application. the recommended applications of an nec electronics product depend on its quality grade, as indicated below. customers must check the quality grade of each nec electronics product before using it in a particular application. the quality grade of nec electronics products is "standard" unless otherwise expressly specified in nec electronics data sheets or data books, etc. if customers wish to use nec electronics products in applications not intended by nec electronics, they must contact an nec electronics sales representative in advance to determine nec electronics' willingness to support a given application. (note) ? ? ? ? ? ? m8e 02. 11-1 (1) (2) "nec electronics" as used in this statement means nec electronics corporation and also includes its majority-owned subsidiaries. "nec electronics products" means any product developed or manufactured by or for nec electronics (as defined above). computers, office equipment, communications equipment, test and measurement equipment, audio and visual equipment, home electronic appliances, machine tools, personal electronic equipment and industrial robots. transportation equipment (automobiles, trains, ships, etc.), traffic control systems, anti-disaster systems, anti-crime systems, safety equipment and medical equipment (not specifically designed for life support). aircraft, aerospace equipment, submersible repeaters, nuclear reactor control systems, life support systems and medical equipment for life support, etc. "standard": "special": "specific":

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