1/4 rev. b structure silicon monolithic integrated circuit product constant voltage and constant current controller for battery chargers and adaptors type ? feature ? constant current and constant voltage control ? high accuracy reference voltage: 1.21v 1% ? an accuracy for current-detecting voltage: 2% absolute maximum ratings (ta=25 ) parameter symbol limit unit power supply voltage vmax -0.3 14 v ict pin maximum voltage victmax -0.3 vcc v power dissipation pd 675 *1 mw operating temperature range topr 0 +85 storage temperature range tstg -55 +150 *1 pd derated at 5.4mw/ for temperature above ta=25 , mounted on 70mm 70mm 1.6mm glass-epoxy pcb. operating conditions (ta=0 +85 ) parameter symbol limit unit power supply voltage vcc 2.5 12 v
2/4 rev. b electrical characterstics (ta=25 and vcc=+5v (unless otherwise specified)) parameter symbol limit unit conditions min. typ. max. total current consumption total supply current - not taking the output sinking current into account icc - 0.9 2 ma voltage control loop transconduction gain(vct). sink current only gmv 1 4.0 - ma/mv *1 voltage control loop reference at 1.5ma sinking current vref 1.198 1.21 1.222 v ta = 2 5 1.186 1.21 1.234 0 < ta < 85 *1 input bias current(vct) ibv - 50 - na *1 current control loop transconduction gain(ict). sink current only gmi 1.5 4.0 - ma/mv *1 current control loop reference at 2.5ma sinking current vse 196 200 204 mv ta = 2 5 192 200 208 0 < ta < 85 *1 current out of pin ict at -200mv ibi - 25 - a output stage low output voltage at 10ma sinking curr ent vol - 200 - mv vse=0v, ict=-0.3v output short circuit current, output to vcc, sink current only ios - 20 50 ma out=vcc, vse=0v, ict=-0.3v this product is not designed for protection against radio active rays. *1 design guarantee packege, marking specification ssop6 (unit:mm)
3/4 rev. b block diagram pin no. & pin name pin no. pin name function 1 vct input pin of the voltage control loop 2 gnd ground line. 0v reference for all voltages 3 out output pin. sinking current only 4 ict input pin of the current control loop(+) 5 vse input pin of the current control loop(-) 6 vcc positive power supply line + - + - voltage reference 1 2 3 45 6 1.21v vcc out vct gnd ict vse
4/4 rev. b operation notes 1) absolute maximum ratings use of the ic in excess of absolute maximum ratings such as the applied voltage or operating temperature range may result in ic deterioration or damage. assumptions should not be made regarding the state of the ic (short mode or open mode) when such damage is suffered. a physical safety measure such as a fuse should be implemented when use of the ic in a special mode where the absolu te maximum ratings may be exceeded is anticipated. 2) gnd potential ensure a minimum gnd pin potential in all operating conditi ons. in addition, ensure that no pins other than the gnd pin carry a voltage lower than or equal to the gnd pin, includ ing during actual transient p henomena. as an exception, the circuit design allows voltages up to -0.3 v to be applied to the ict pin. 3) setting of heat use a thermal design that allows for a sufficient margin in light of the power dissipation (pd) in actual operating conditions. 4) pin short and mistake fitting use caution when orienting and positioning the ic for mounti ng on printed circuit boards. improper mounting may result in damage to the ic. shorts between output pins or betw een output pins and the power supply and gnd pin caused by the presence of a foreign object may result in damage to the ic. 5) actions in strong magnetic field use caution when using the ic in the pr esence of a strong electromagnetic field as doing so may cause the ic to malfunction. 6) mutual impedance power supply and ground wiring should reflect consideration of the need to lower mutual impedance and minimize ripple as much as possible (by making wiring as short and th ick as possible or rejecting ripple by incorporating inductance and capacitance). 7) regarding input pin of the ic this monolithic ic contains p+ isolat ion and p substrate layers between adjac ent elements in order to keep them isolated. p/n junctions are formed at the intersection of these p layers with the n layers of other elements to create a variety of parasitic elements. for example, when a resistor and transistor are connected to pins as shown in fig. 19, the p/n junction functions as a parasitic diode when gnd > (p in a) for the resistor or gnd > (pin b) for the transistor (npn). similarly, when gnd > (pin b) for the transistor (n pn), the parasitic diode described above combines with the n layer of other elements to operate as a parasitic npn transi stor. the formation of parasitic elements as a result of the relationships of the potentials of different pins is an inevitable result of the ic's architecture. the operation of parasitic elements can cause interference with circuit operation as we ll as ic malfunction and damage. for these reasons, it is necessary to use caution so that the ic is not used in a way that will trigger the operation of parasitic elements, such as by the application of voltages lower than the gnd (p substrate) voltage to i/o pins. although the circuit design allows voltages up to -0.3 v to be applied to the ict pin, voltages lower than this may cause the behavior described above. use c aution when designing the circuit. simplified structure of a monolithic ic p substrate n parasitic elements gnd n p n p+ p+ resistor parasitic elements gnd n p n n p+ p+ transistor (npn) b n e c gnd p substrate (pin b) (pin a) gnd parasitic elements (pin a) gnd b c e other adjacent elements parasitic elements (pin b)
r1120 a www.rohm.com ? 2011 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 produc ts. 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.
|
