1/9 www.rohm.com 2009.04 - rev.a ? 2009 rohm co., ltd. all rights reserved. cmos ldo regulator series for portable equipments cmos ldo regulators with auto power saving function bh pb1whfv series ? description the bh pb1whfv regulator series can respond to changes in output current by switching to a state in which regulator characteristics are ideal. the regulators cut power consumpti on by lowering their own current consumption to approximately 2 ? a when the application is operating in the standby state. during normal-current operation it will automatically switch to high-speed operating mode. the ic's soft start function reduce t he rush current that flows to the output capacitors during startup. the hvsof5 package, which features excellent heat dissipation, contributes to space-saving application designs. ? features 1) automatic switching between low-consumption and high-speed modes 2) built-in rush current prevention circuit 3) low-voltage 1.7 v operation 4) high accuracy output voltage: 1% 5) circuit current during lo w-consumption operation: 2 ? a 6) stable with a ceramic capacitor (0.47 ? f) 7) built-in temperature and ov ercurrent protection circuits 8) built-in output discharge duri ng standby operation function 9) ultra-small hvsof5 power package ? applications battery-driven portable devices, etc. ? product lineup ? 150 ma bh pb1whfv series product name 1.2 1.5 1.8 2.5 2.8 2.9 3.0 3.1 3.3 package bh pb1whfv hvsof5 model name: bh pb1w a b symbol description a output voltage specification output voltage (v) output voltage (v) 12 1.2 v (typ.) 29 2.9 v (typ.) 15 1.5 v (typ.) 30 3.0 v (typ.) 18 1.8 v (typ.) 31 3.1 v (typ.) 25 2.5 v (typ.) 33 3.3 v (typ.) 28 2.8 v (typ.) b package hfv: hvsof5 no.09020eat05
technical note bh pb1whfv series 2/9 www.rohm.com 2009.04 - rev.a ? 2009 rohm co., ltd. all rights reserved. ? absolute maximum ratings (ta = 25c) parameter symbol limits unit power supply voltage vmax ? ? ? ? ? ? recommended operating ranges (not to exceed pd) parameter symbol limits unit power supply voltage v in 1.7 to 5.5 v output max current imax 0 to 150 ma ? recommended operating conditions parameter symbol min. typ. max. unit conditions input capacitor c in 0.33 *2 0.47 ? ? ? ?
technical note bh pb1whfv series 3/9 www.rohm.com 2009.04 - rev.a ? 2009 rohm co., ltd. all rights reserved. ? electrical characteristics (unless otherwise specified, ta = 25c, v in = v out + 1.0 v, stby = 1.5 v, sel = 0 v, c in = 0.47 ? ? R Q R Q ? ? ? ? ? electrical characteristics of each output voltage output voltage parameter min. typ. max. unit conditions 1.2 v max. output current 70 120 ? ? ? ? ? ? ? ? ?
technical note bh pb1whfv series 4/9 www.rohm.com 2009.04 - rev.a ? 2009 rohm co., ltd. all rights reserved. ? typical characteristics 0 10 0 20 0 30 0 40 0 050100150 o utput current i out [ma] in put outp ut volta ge d iffer en ce v sat [mv] 0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 0 100 200 300 400 output current i out [ma] output voltage v out [v] fig. 2 output voltage vs input voltage (bh30pb1whfv) fig. 3 output voltage vs input voltage (bh33pb1whfv) (bh33pb1whfv) input voltage fig.6 gnd current vs
technical note bh pb1whfv series 5/9 www.rohm.com 2009.04 - rev.a ? 2009 rohm co., ltd. all rights reserved. 0.01 ? ? ? ? ?rg ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ?
technical note bh pb1whfv series 6/9 www.rohm.com 2009.04 - rev.a ? 2009 rohm co., ltd. all rights reserved. ? block diagram, recommended circuit diagram, and pin assignment table ? auto power-saving function ? power dissipation (pd) 1. power dissipation (pd) power dissipation calculations include estimates of power dissipation characteristics and internal ic power consumption, and should be treated as guidelines. in the event that the ic is used in an environment where this power dissipation is exceeded, the attendant rise in the junction temperature will trigger the thermal shutdown circuit, reducing the current capaci ty and otherwise degrading the ic's design performance. allow for sufficient margins so that this power dissipation is not exceeded during ic operation. calculating the maximum internal ic power consumption (pmax) 2. power dissipation/heat reduction (pd) p max = (v in - v out ) ? pin no. symbol function 1 stby output voltage on/off control(high: on, low: off) 2 gnd ground 3 v in power supply input 4 v out voltage output 5 sel mode switching (high: fix in high-speed mode low: automatic low-consumption mode switching) the ic incorporates a built-in auto power-saving function that continuously monitors the output current and switches automatically between a low current consumption regulator and a high-speed operation regulator. this function reduces the regulator's own current cons umption to approximately 1/10 or lower of normal levels when the output current falls below approximately 300 ? fig. 26 auto power-saving function (example) fig. 25 cin ? 0.47 ? ? bhpb1whfv thermal & over current protection voltage reference + - + - control block discharge vout co sel vin gnd stby cin 1 2 3 4 5 current monitor ch1 ch2 sofft start - - rss css ( ) ( ) measurement conditions bh12pb1whfv vcc = 2.2 v vsel = open, vstby = 1.5 v 0 10 20 30 00.511.522.53 out put current i out [ma] gnd current ignd [ a] ? ? 410 mw hvsof5 *circuit design should allow a sufficient margin for the temperature range so tha t p max < pd. v in : input voltage v out : output voltage i out (max) : max. output current
technical note bh pb1whfv series 7/9 www.rohm.com 2009.04 - rev.a ? 2009 rohm co., ltd. all rights reserved. 0.01 0.1 1 10 100 0 50 100 150 output current ? ? input output capacitors it is recommended to insert bypass capacitors between inpu t and gnd pins, positioning them as close to the pins as possible. these capacitors will be used when the power supply impedance increases or when long wiring paths are used, so they should be checked once the ic has been mounted. ceramic capacitors generally have temperature and dc bias char acteristics. when selecting ceramic capacitors, use x5r or x7r, or better models that offer good temperature and dc bias characteristics and high tolerant voltages. typical ceramic capacitor characteristics ? output capacitors mounting input capacitor between input pin and gnd(as close to pin as possible), and also output capacitor between output pin and gnd(as close to pin as possible) is recommended. the input capacitor reduces the output impe dance of the voltage supply source conn ected to the vcc. the higher value the output capacitor goes, the more stable the whole operation becomes. this leads to high load transient response. please confirm the whole operation on actual application board. generally, ceramic capacitor has wide range of tolerance, tem perature coefficient, and dc bias characteristic. and also its val ue goes lower as time progresses. please choose ceramic capacitors after obtaining more detailed data by asking capacitor makers. ? operation notes 1. absolute maximum ratings an excess in the absolute maximum ratings, such as supply voltage, temperature range of operating conditions, etc., can break down the devices, thus making impossible to identify breaking mode, such as a shor t circuit or an open circuit. if any over rat ed values will expect to exceed the absolute maximum ratings, consider adding circuit protection devices, such as fuses. 2. thermal design use a thermal design that allows for a suffic ient margin in light of the power dissipa tion (pd) in actual operating conditions. 3. inter-pin shorts and mounting errors use caution when positioning the ic for mounting on printed circuit boards. the ic may be damaged if there is any connection error or if pins are shorted together. 4.thermal shutdown circuit (tsd) the ic incorporates a built-in thermal shutdown circuit (tsd circuit). the thermal shutdown circuit is designed only to shut th e ic off to prevent runaway thermal operation. it is not designed to protect the ic or guarantee its operation. do not continue t o use the ic after operating this circuit or use the ic in an environment where the operation of this circuit is assumed. 5. ground wiring patterns the power supply and ground lines must be as short and thi ck as possible to reduce line impedance. fluctuating voltage on the power ground line may damage the device. 0 20 40 60 80 100 120 01234 dc bias vdc (v) capacitance rate of change (%) 70 75 80 85 90 95 100 01234 dc bias vdc (v) capacitance rate of change (%) 0 20 40 60 80 100 120 -25 0 25 50 75 temp[ 10 v rated voltage 50 v rated voltage 16 v rated voltage 10 v rated voltage fig. 28 capacitance vs bias (y5v) fig. 29 capacitance vs bias (x5r, x7r) fig. 30 capacitance vs te m p erature ( x5r, x7r, y5v ) fig. 31 stable operation region (example) c out = 0.47 p f ta = +25c bhpb1whfv 16 v rated voltage 50 v rated voltage x7r x5r y5v
technical note bh pb1whfv series 8/9 www.rohm.com 2009.04 - rev.a ? 2009 rohm co., ltd. all rights reserved. 0.01 ? 0.1 ? 1.0 ? 100 ? 1.0 m 10 100 fr eq uency f[hz] ?rg trise [sec] startup time rss = 10 k ? i o = no load slow start capacitance css (f) 6. overcurrent protection circuit the ic incorporates a built-in overcurrent protection circuit that operates according to the output current capacity. this circ uit serves to protect the ic from damage when th e load is shorted. the protection circuit is designed to limit current flow by not latching in the event of a large and instantaneous current flow originating from a large capacitor or other component. these protection circuits are effective in preventing damage due to sudden and unexpected accidents. however, the ic should not be used in applications characterized by the continuous operation or transitioning of the protection circuits. at the time of thermal designing, keep in mind that the current capability has negative characteristics to temperatures. 7. actions in strong electromagnetic field use caution when using the ic in the presence of a strong electromagnetic field as doing so may cause the ic to malfunction. 8. back current in applications where the ic may be exposed to back current fl ow, it is recommended to create a path to dissipate this current by inserting a bypass diode between the vin and vout pins. fig. 32 example bypass diode connection 9. i/o voltage difference using the ic in automatic switching mode when the i/o voltage differential becomes saturated (vin - vout < 150 mv) may result in a large output noise level. if the noise level bec omes problematic, use the ic with the sel pin in the high state when the voltage differential is saturated. 10.gnd voltage the potential of gnd pin must be minimu m potential in all operating conditions. 11. preventing rush current by attaching the rss and css time constants to the stby pin, sudden rises in the regulator output voltage can be prevented, dampening the flow of rush cu rrent to the output capacitors. the larger the time constant used, the greater the resulting reduction. however, large time constants also result in longer startup times, so the constant should be selected after considering the conditions in which the ic is to be used. 12. regarding input pin of the ic (fig.34) this monolithic ic contains p+ isolation and p substrate layers between adjacent el ements in order to keep them isolated. p-n junctions are formed at the intersection of these p layers wi th the n layers of other elem ents, creating a parasitic diode or transistor. for example, the relation between each potential is as follows: when gnd > pin a and gnd > pin b, the p-n j unction operates as a parasitic diode. when gnd > pin b, the p-n junction operates as a parasitic transistor. parasitic diodes can occur inevitable in the structure of the ic. the operation of parasitic diodes can result in mutual interference among circuits, operational faults, or physical damage. accordingly, methods by which parasitic diodes operate, such as applying a voltage that is lower than the gnd (p substrate) voltage to an input pin, should not be used. vin stby gnd out back current fig.34 resistor transistor (npn) n n n p + p + p p substrate gnd parasitic element pin a n n p + p + p p substrate gnd parasitic element pin b c b e n gnd pin a p aras iti c element pin b other adjacent elements e b c gnd p aras iti c element fig. 33 vout startup time vs css capacitance (reference)
technical note bh pb1whfv series 9/9 www.rohm.com 2009.04 - rev.a ? 2009 rohm co., ltd. all rights reserved. ? ordering part number b h 3 0 p b 1 w h f v - t r part no. output voltage series pb1:auto power- saving type shutdown switch w : includes switch package hfv : hvsof5 packaging and forming specification tr: embossed tape and reel (unit : mm) hvsof5 s 0.08 m 0.1 s 4 321 5 (0.05) 1.60.05 1.00.05 1.60.05 1.2 0.05 (max 1.28 include burr) 45 32 1 (0.8) (0.91) (0.3) (0.41) 0.2max 0.130.05 0.220.05 0.6max 0.5 0.02 +0.03 ?0.02 direction of feed reel ? order quantity needs to be multiple of the minimum quantity. embossed carrier tape tape quantity direction of feed the direction is the 1pin of product is at the upper right when you hold reel on the left hand and you pull out the tape on the right hand 3000pcs tr () 1pin
r0039 a www.rohm.com ? 2009 rohm co., ltd. all rights reserved. notice rohm customer support system http://www.rohm.com/contact/ thank you for your accessing to rohm product informations. more detail product informations and catalogs are available, please contact us. notes no copying or reproduction of this document, in part or in whole, is permitted without the consent of rohm co.,ltd. the content specied herein is subject to change for improvement without notice. the content specied herein is for the purpose of introducing rohm's products (hereinafter "products"). if you wish to use any such product, please be sure to refer to the specications, which can be obtained from rohm upon request. examples of application circuits, circuit constants and any other information contained herein illustrate the standard usage and operations of the products. the peripheral conditions must be taken into account when designing circuits for mass production. great care was taken in ensuring the accuracy of the information specied in this document. however, should you incur any damage arising from any inaccuracy or misprint of such information, rohm shall bear no responsibility for such damage. the technical information specied herein is intended only to show the typical functions of and examples of application circuits for the products. rohm does not grant you, explicitly or implicitly, any license to use or exercise intellectual property or other rights held by rohm and other parties. rohm shall bear no responsibility whatsoever for any dispute arising from the use of such technical information. the products specied in this document are intended to be used with general-use electronic equipment or devices (such as audio visual equipment, ofce-automation equipment, commu- nication devices, electronic appliances and amusement devices). the products specied in this document are not designed to be radiation tolerant. while rohm always makes efforts to enhance the quality and reliability of its products, a product may fail or malfunction for a variety of reasons. please be sure to implement in your equipment using the products safety measures to guard against the possibility of physical injury, re or any other damage caused in the event of the failure of any product, such as derating, redundancy, re control and fail-safe designs. rohm shall bear no responsibility whatsoever for your use of any product outside of the prescribed scope or not in accordance with the instruction manual. the products are not designed or manufactured to be used with any equipment, device or system which requires an extremely high level of reliability the failure or malfunction of which may result in a direct threat to human life or create a risk of human injury (such as a medical instrument, transportation equipment, aerospace machinery, nuclear-reactor controller, fuel-controller or other safety device). rohm shall bear no responsibility in any way for use of any of the products for the above special purposes. if a product is intended to be used for any such special purpose, please contact a rohm sales representative before purchasing. if you intend to export or ship overseas any product or technology specied herein that may be controlled under the foreign exchange and the foreign trade law, you will be required to obtain a license or permit under the law.
|
