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TB9000CFNG 2011-11-02 1 toshiba bicmos integrated circuit silicon monolithic TB9000CFNG 5 v voltage regulator with watchdog timer the TB9000CFNG is an ic specially designed for microcomputer systems in automobiles. it features low standby current and various system reset functions. with an external pass tr., the TB9000CFNG can supply a high output current. a current limiter function is incorporated as a protective function. system reset includes low-voltage reset, power-on reset, and watchdog timer functionality. features ? accurate output: 5.0 v 0.15 v ? low current consumption: 120 a (v in = 12 v, ta = 25c) at 5 v output + reset timer ? reset functions: low-voltage reset/power-on reset/watchdog timer ? current limiter: adjustable with external resistor ? operating temperature: ? 40 to 125c ? small smd package: ssop-20-pin (0.65 mm pitch) ? the product(s) is/are compatible with rohs regulations (eu directive 2002 / 95 / ec) as indicated, if any, on the packaging label ("[[g]]/rohs comp atible", "[[g]]/rohs [[chemical symb ol(s) of controlled substance(s)]]", "rohs compatible" or "rohs compatible, [[chemica l symbol(s) of controlled substance(s)]]>mcv"). about solderability, the following conditions were confirmed. solderability (1) use of sn-37pb solder bath z solder bath temperature=230c z dipping time=5seconds z the number of times=once z use of r-type flux (2) use of sn-3.0ag-0 .5cu solder bath z solder bath temperature=245c z dipping time=5seconds z the number of times=once z use of r-type flux weight: 0.1 g (typ.)
TB9000CFNG 2011-11-02 2 block diagram & pin layout note: some functional blocks, circuits, or constants are omitted or simp lified in the block diagram to clarify the descriptions of the relevant features. 0.3 v 1 2 3 watchdog timer power on reset vref 5 v reg amp 70 k ? current limiter nc nc ws ck nc tc nc nc 4 5 nc 20 19 18 17 16 15 14 13 12 100k comp 250k 6 8 9 10 11 130k 7 v cc v cc v cc v cc nc v in comp vcc gnd nc nc nc out reset v s
TB9000CFNG 2011-11-02 3 pin description pin no. symbol description 1 v in power supply input pin. it contains a current limiter and startup circuit. 3 v s detection pin for the v cc current limiter. any voltage drop occurring in the external resistor r s between pins v in and v s is monitored. the current limiter is actuated when the voltage drop exceeds 0.3 v. ex.) when the current limiter need to be actuated at a load current of 600 ma: r s = 0.3 v/600 ma = 0.5 ? . 5 out this pin is used to connect the base of an external pnp transistor. the output voltage is controlled by an internal op-amp to maintain it stably at 5 v. since the recommended i out current is 8 ma, an output current of 600 ma can be run if h fe of the external transistor is 80 or more. 7 comp phase-compensating pin for v cc . connect a phase-compensating capacitor between pin v cc and this pin. 8 v cc voltage detection pin for the 5 v c onstant-voltage power supply, v cc . it also supplies power to the reset timer circuit. 10 gnd grounded 11 reset reset output pin for power-on reset and watchdog timer. generates a reset signal that is determined by ct at the tc pin. if no clock is fed to the ck input, this pin generates a reset pulse intermittently. this is an n-mos drain output with a 100 k ? pull-up resistor to v cc . 14 tc time setup pin for the reset and watchdog timers. connect capacitor ct to gnd. the time is set up by internal constant current. 16 ck clock input pin for the watchdog timer. this pin detects the rising edge of the input signal and does not require external coupling capacitor. built-in pull-down resistor (250 k ? ). 18 ws watchdog timer function on/off control pin. set to low for active mode and high for inactive mode. built-in pull-down resistor (130 k ? ). 2, 4, 6, 9, 12, 13, 15, 17, 19, 20 nc not connected. (electrically, this pin is completely open.)
TB9000CFNG 2011-11-02 4 functional description the TB9000CFNG incorporates a constant-voltage 5 v power supply function to feed stable power to the cpu, while the system reset and cpu monitor functions ensure stable operation of the cpu, etc. these functions are explained below. (1) constant-voltage 5 v power supply function this constant-voltage function has a reference voltage v ref in the ic that is insusceptible to temperature changes and input voltage fluctuations. the power supply circuit is designed in such a way that this voltage is stepped up to 5 v by using an op amp and a voltage-dividing resistor. the op amp, dividing resistor and an output transistor connected to th e op amp output together configure a closed loop. an overcurrent protection function is incorporated as a protecti ve measure in case a fault such as shorting to gnd occurs in the 5 v output. a current detecting resi stor is inserted between the v in and the v s pins, and a voltage drop across this resistor is detected by a comparator , thereby suppressing the operation of the op amp to ensure that the voltage drop will not exceed 0.3 v. in this way, a current limiter function is actuated to prev ent any more current from flowing. (2) system reset function (see timing charts) voltage monitoring function when powered on, the power-on reset timer starts counting the moment the voltage v cc applied to the cpu exceeds vth. when powered off, this volt age monitoring function outputs a reset signal immediately when v cc drops below vth. a reset signal is also output immediately when v cc drops for some reason during normal operation. then, when v cc is restored to the normal voltage and exceeds vth, the power-on reset timer starts counting. the reset signal is output from the reset pin. power-on reset timer function to allow the 5 v constant voltage to stabilize at po wer-on, as well as provide sufficient time for the clock oscillation in the cpu to stabilize, the device remains reset for a predetermined time before being released from the reset state. the duration of this time can be set as desired by choosing appropriate values for the external capacitor connected to the tc pin. the system starts charging the capacitor when the v cc voltage exceeds vth. when this charge voltage exceeds 4 v, the capacitor is discharged by the ic?s internal transistor. when the capacitor is discharged down to 2 v, the reset signal is inverted to deactivate the reset. watchdog timer function program your system to output a clock each time one program routine is fini shed in the cpu system software, and input this clock to the ck pin of th e ic. the ic?s tc pin is repeatedly charged and discharged between 2 v and 4 v. however, when a clock is input, it swit ches over and starts discharging in the middle of chargi ng and then starts charging from 2 v again. since the clock is generated at predetermined intervals when the cpu sy stem is operating norma lly, the tc pin switches over and starts discharging before the charge voltag e reaches 4 v. however, if no clock is input while being charged from 2 v to 4 v, the clock is assumed to have stopped, i.e., the cpu system has gone wild, so that a reset signal is output to reset the cpu system. watchdog timer stop function the watchdog timer can be switched on or off by us e of the ws pin. if the ws pin is fixed to low, the watchdog timer will be active. (see timing chart 1.) if the ws pi n is fixed to high, the watchdog timer will be inactive. (see timing chart 2.) when the ws pin is fixed to high, no reset signal is output, in which case only the power-on reset timer is useful. note: the overcurrent protection feature is intended only to protect the ic from a temporary short circuit. a short circuit over an extended period of time may place excessive stress on the ic, possibly causing it to be damaged. the system must be config ured so that any overcurrent condit ion will be eliminated as soon as possible.
TB9000CFNG 2011-11-02 5 timing chart 1: ws = low timing chart 2: ws = high note 1: definitions of symbols used in this timing char t are provided in the electric al characteristics table. note 2: timing charts may be simplified to clar ify the descriptions of features and operations.
TB9000CFNG 2011-11-02 6 absolute maximum rating (ta = 25c) characteristics symbol pin rating unit v in 1 v in , v s 45 (1 s) v in 2 v cc 6.0 input voltage v in 3 ck, ws, tc v cc v i out 1 out 10 output current i out 2 reset 5 ma v out 1 out 45 (1 s) output voltage v out 2 reset v cc v operating temperature t opr D ? 40 to 125 c storage temperature t stg D ? 55 to 150 c ssop20-p-225-0.65a thermal resistance data (ta = 25c) characteristics rating unit test condition r j-a 200 c/w without radiation board pd1 0.6 w without radiation board pd2 1.0 w 75 114 1.6 mm 20% cu board mounted note: the absolute maximum ratings of a semiconductor device are a set of specified par ameter values that must not be exceeded during operation, even for an instant. if any of these levels is exceeded during operation, t he device?s electrical characteristics may be irreparably altered and the reliability and lifetime of the device can no longer be guaranteed, possibly causing damage to any other equipment with which it is used. applicat ions using the device should be designed so that the absolute maximum ratings will never be ex ceeded in any operating conditions. ensuring that the parameter values remain within t hese specified ranges during device operation will help to ensure that the integrity of th e device is not compromised.
TB9000CFNG 2011-11-02 7 electrical characteristics (unless otherwise specified, v in = 6 to 16 v, iload = 10 ma, ta = ? 40 to 125c) characteristics symbol pin test circuit test condition min typ. max unit ta = ? 40 to 105c 4.85 5.0 5.15 output voltage vreg v cc D ta = ? 40 to 125c 4.82 5.0 5.15 v line regulation vline v cc D v in = 6 to 40 v D 0.1 0.5 % load regulation vload v cc D iload = 1 to 300 ma D 0.2 1.0 % temperature coefficient D v cc D D 0.01 D %/c output voltage vol reset D iol = 2 ma D D 0.3 v output leakage current ileak reset D v in ( reset ) = v cc D D 5 a input current iin tc D v in (tc) = gnd D ? 10 D a iih D v in (ck) = v cc 5 D 45 input current iil ck D v in (ck) = 0 v ? 5 D 5 a iih D v in (ws) = v cc 15 D 85 input current iil ws D v in (ws) = 0 v ? 5 D 5 a vih 0.8 v cc D D input voltage vil ck D D D 0.2 v cc v vih 0.8 v cc D D input voltage vil ws D D D 0.2 v cc v current limiter detection vlimit v in , v s D 0.225 0.3 0.375 v ta = 25c, v in = 12 v D 120 170 current consumption i cc D D ta = ? 40 to 125c, v in = 12 v D 120 190 a vth 4.5 4.7 4.9 reset detection voltage vth v cc D v cc ? vth 0.25 0.30 0.35 v power-on reset tpor reset D 280 ct 400 ct 520 ct ms watchdog timer twd reset D 140 ct 200 ct 260 ct ms reset timer trst reset D 4.0 ct 8.0 ct 12.0 ct ms clock pulse width tw ck D 3 D D s note 1: ct is measured in units of f. note 2: the specification values for power-on reset, watchdog timer and reset timer above are guaranteed only for the ic itself. any practical applicat ion of the ic should take into acco unt fluctuations in the ct value. note 3: for the above current consumpti on icc, it is specified that iload = 0 ma. operating conditions part name min typ. max unit ct 0.01 0.25 10 f
TB9000CFNG 2011-11-02 8 reference characteristics input ? output characteristics v in (v) v cc (v) v cc (v) 0 0 2 4 6 2 4 6 v reset (v) v limit (v) current limiter characteristics v cc (v) 7 0 0 6 5 4 3 2 1 0.1 0.2 0.3 0.4 reset output characteristics 0 2 4 6 0 2 4 6
TB9000CFNG 2011-11-02 9 example of application circuit note 1: caution for wiring c1 and c2 are for absorbing disturbances, no ise, etc. c3 is for phase compensation. connect each capacitor as close to the ic as possible. note 2: ensure that the ic is mounted correctly. failure to do so may result in the ic or target equipment being damaged. note 3: the application circuit shown above is not intend ed to guarantee mass production. a thorough evaluation is required when designing an application circuit for mass production. current limiter constant voltage reset timer 5 v monitor vb r s 5.0 v 10 f c1 10 f c2 c3 470 pf 1 k ? v in v s out comp v cc TB9000CFNG tc gnd ct ck ws reset reset po1 cpu v dd
TB9000CFNG 2011-11-02 10 package dimensions weight: 0.1 g (typ.)
TB9000CFNG 2011-11-02 11 restrictions on product use ? toshiba corporation, and its subsidiaries and affiliates (collect ively ?toshiba?), reserve the right to make changes to the in formation in this document, and related hardware, software a nd systems (collectively ?product?) without notice. ? this document and any information herein may not be reproduc ed without prior written permission from toshiba. even with toshiba?s written permission, reproduc tion is permissible only if reproducti on is without alteration/omission. ? though toshiba works continually to improve product?s quality and reliability, product can malfunction or fail. customers are responsible for complying with safety standards and for providing adequate designs and safeguards for their hardware, software and systems which minimize risk and avoid situat ions in which a malfunction or failure of product could cause loss of human life, b odily injury or damage to property, including data loss or corruption. before customers use the product, create designs including the product, or incorporate the product into their own applications, cu stomers must also refer to and comply with (a) the latest ve rsions of all relevant toshiba information, including without limitation, this document, the specifications, the data sheets and applicat ion notes for product and the precautions and condi tions set forth in the ?toshiba se miconductor reliability handbook? and (b) the instructions for the application with which the product will be us ed with or for. customers are solely responsible for all aspe cts of their own product design or applications , including but not limited to (a) determining t he appropriateness of the use of this product in such design or applications; (b) eval uating and determining the applicability of any info rmation contained in this document, or in c harts, diagrams, programs, algorithms, sample application circuits, or any other referenced documents; and (c) validating all operatin g parameters for such designs and applications. toshiba assumes no liability for customers? product design or applications. ? product is intended for use in general el ectronics applications (e.g., computers, personal equipment, office equipment, measur ing equipment, industrial robots and home electroni cs appliances) or for specif ic applications as expre ssly stated in this document . product is neither intended nor warranted for use in equipment or systems that require extraordinarily high levels of quality a nd/or reliability and/or a malfunction or failure of which may cause loss of human life, bodily injury, serious property damage or se rious public impact (?unintended use?). unintended use includes, without limitation, equipment used in nuclear facilities, equipment used in the aerospace industry, medical equipment, equipment used for automobiles, trains, ships and other transportation, traffic s ignaling equipment, equipment used to control combustions or explosions, safety dev ices, elevators and escalators, devices related to el ectric power, and equipment used in finance-related fields. do not use product for unintended use unless specifically permitted in thi s document. ? do not disassemble, analyze, reverse-engineer, alter, modify, translate or copy product, whether in whole or in part. ? product shall not be used for or incorporated into any products or systems whose manufacture, use, or sale is prohibited under any applicable laws or regulations. ? the information contained herein is pres ented only as guidance for product use. no re sponsibility is assumed by toshiba for an y infringement of patents or any other intellectual property rights of third parties that may result from the use of product. no license to any intellectual property right is granted by this document, whether express or implied, by estoppel or otherwise. ? absent a written signed agreement, except as provid ed in the relevant terms and conditions of sale for product, and to the maximum extent allowable by law, toshiba (1) assumes no liability whatsoever, including without limitation, indirect, co nsequential, special, or incidental damages or loss, including without limitation, loss of profit s, loss of opportunities, business interruption and loss of data, and (2) disclaims any and all express or implied warranties and conditions related to sale, use of product, or information, including warranties or conditions of merchantability, fitness for a particular purpose, accuracy of information, or noninfringement. ? do not use or otherwise make available product or related so ftware or technology for any military purposes, including without limitation, for the design, development, use, stockpiling or m anufacturing of nuclear, chemical , or biological weapons or missi le technology products (mass destruction w eapons). product and related software and technology may be controlled under the japanese foreign exchange and foreign trade law and the u.s. expor t administration regulations. ex port and re-export of product or related software or technology are strictly prohibited exc ept in compliance with all applic able export laws and regulations. ? please contact your toshiba sales representative for details as to environmental matters such as the rohs compatibility of pro duct. please use product in compliance with all applicable laws and regula tions that regulate the inclus ion or use of controlled subs tances, including without limitation, the eu rohs directive. toshiba assumes no liability for damages or losses occurring as a result o f noncompliance with applicable laws and regulations.

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