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TB9001FN
TOSHIBA BiCMOS INTEGRATED CIRCUIT SILICON MONOLITHIC FOR AUTOMOTIVE USE
TB9001FN
5 V Voltage Regulator with Watchdog Timer
The TB9001FN is specially designed for microcomputer systems. The IC features low standby current, oscillator function for CPU sub-clock and various system reset functions. With external power transistor, TB9001FN can supply high output current. As a protective feature, current limiter function is incorporated. For system reset includes low voltage reset, power-on reset, and watchdog timer functions. Weight: 0.1 g (typ.)
FEATURES
* * * * * * Accurate output: 5.0V 0.15V Low current consumption: 95A (VIN=12V, Ta=25C) at 5V output + reset timer + 32kHz sub-clock Reset functions: Low voltage reset / power on reset / watchdog timer Current limiter: Adjustable with external resistor Operating temperature : -40~125C Small SMD package: SSOP-20pin
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BLOCK DIAGRAM AND PIN LAYOUT
TR
TC
NC
WS
SCK
NC
RESET
NC
CK
GND
20
19
18
17
16
15
14
13
12 9
Output 32kHz OSC LOGIC
Band Gap
Power ON Reset
Current Limiter
Constant Voltage
VIN
NC
NC
VS
OUT
COMP
VCC
NC
TADJ-L TADJ-H
Note:
Some of the functional blocks, circuits, or constants in the block diagram are omitted or simplified to clarify the descriptions of the relevant features.
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1
2
3
4
5
6
7
8
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TB9001FN
PIN DESCRIPTION
PIN No. 1 SYMBOL VIN DESCRIPTION Power supply input pin. It contains current limiter and startup circuit. Detection pin for the Vcc current limiter. This pin monitors any voltage drop occurring in the external resistor Rs between pins VIN and Vs, and the current limiter is actuated when the 4 Vs voltage drop exceeds 0.7 V. Ex.) When the current limiter need to be actuated at a load current of 250mA, Rs 0.7 V / 250 mA 2.8 This pin is used to connect the base of an external PNP transistor. The output voltage is 5 OUT controlled by an internal op-amp to keep it stable at 5 V. Since the recommended current of Iout is 5 mA, an output current of 300mA can be run if the HFE of the external transistor is 60 or more. 6 7 COMP Vcc Phase compensating pin for Vcc. Connect a phase compensating capacitor between pin Vcc and this pin. Voltage detection pin for the 5 V constant-voltage power supply, Vcc. This pin also supplies power to the reset timer circuit. Time setup pins for the reset and watchdog timers. For a 32 kHz sub-clock, the time is set 9 TADJ-L by combinations of TADJ-L and TADJ-H. ( These pins must be connected to Vcc or 0V because of logic input.) TADJ-H = Vcc , TADJ-L = Vcc : TPOR = 50ms , TWD = 50ms , TRST = 5ms TADJ-H = Vcc , TADJ-L = 0V : TPOR = 200ms , TWD = 100ms , TRST = 10ms 10 11 12 TADJ-H GND CK TADJ-H = 0V , TADJ-L = Vcc : TPOR = 50ms , TWD = 25ms , TRST = 2.5ms TADJ-H = 0V , TADJ-L = 0V : TPOR = 100ms , TWD = 50ms , TRST = 5ms Grounded Clock input pin for the watchdog timer. This pin detects rising edge of the input signal and does not require external coupling capacitor. Reset output pin for power on reset and watchdog timer. 14 ______ RESET SCK WS TC TR NC Generates a reset signal that is determined by sub-clock and TADJ pins. If no clock is fed to the CK input, this pin generates a reset pulse intermittently. This is an N-MOS drain output with 100 k pull-up resistor. 16 17 19 20 2 , 3 , 8 , 13 , 15 , 18 Sub-clock output pin for CPU. Watchdog timer function ON / OFF control pin. Set to "Low" for active mode and "High" for Inactive mode. Time setup pin for sub-clock. Connect capacitor CT to GND. The time is set using the internal constant current from TR pin. Time setup pin for sub-clock. Connect resistor RT between TC pin and TR pin. Not connected. ( Electrically, these pins are completely open. )
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Functional Description
* Sub-Clock Oscillation Circuit This IC has a built -in sub-clock function the basic circuit configuration of which comprises a CR charge-discharge circuit and a detection circuit for oscillator abnormalities. The sub-clock is also used as the source oscillation frequency for the timer functions: power on reset, watchdog, and reset.
Basic Operation The resistor RT which sets the charge-and-discharge current, is connected between TC and TR pins, and the capacitor CT is connected between TC and GND pins. The TC pin is repeatedly charged and discharged between VCC04 and VCC06. If TC pin or TR pin is shorted to Vcc or GND, the RESET signal goes to LOW.
External Resistor and Capacitor
VCC06 : Vcc x 0.6 VCC04 : Vcc x 0.4
fosc ( Hz ) = 1 / (( t1 + t2 ) x 2 ) t1 = RT x CT x ln( VCC06 / VCC04 ) t2 = Delay time of internal circuit 1s
[ Example ] CT = 75pF , RT = 480k
t1 = 480 k x 75 pF x ln( 3 V / 2 V ) = 14.6 s fosc = 1 / (( 14.6 s + 1 s ) x 2 ) 32.05 kHz
t1 t2
VCC
t1
VCC06
VCC04
t2
GND
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TIMING CHART
5V VTH-H VTH-L VTH-H VTH-L
Vcc 0V
CK 0V RESET 0V
TRST Td Td
WS 0V
TPOR
TWD
TPOR TWD
TWD
SCK 0V
Note: Timing charts may be simplified to clarify the descriptions of features and operations.
MAXIMUM RATING (Ta=25C)
CHARACTERISTIC SYMBOL VIN COMP,SCK, Input Voltage WS,Vcc, RESET,CK, TADJ-L/H, TC,TR Output Current IOUT Topr Tstg 5 - 40~125 - 55~150 mA C C
---------------------
RATING 45(1s)
UNIT V
6.0
V
Operating Temperature Storage Temperature
Note:
The absolute maximum ratings of a semiconductor device are a set of specified parameter values that must not be exceeded during operation, even for an instant. If any of these levels is exceeded during operation, the 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. Applications using the device should be designed so that the maximum ratings will never be exceeded in any operating conditions. Ensuring that the parameter values remain within these specified ranges during device operation will help to ensure that the integrity of the device is not compromised.
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ELECTRICAL CHARACTERISTICS ( VIN=6~16V , ILOAD=10mA , Ta=-40~125C )
CHARACTERISTIC Output Voltage Line Regulation Load Regulation Temperature Coefficient Output Voltage Output Leakage Current Threshold Voltage VIL Input Current Input Voltage Input Current Input Voltage Input Current Input Voltage Output Voltage Current Limiter Detection Current Consumption Reset Detection Voltage IIN VIH VIL IIN VIH VIL IIN VIH VIL VOH VOL VLIMIT Icc VTH VTH TPOR-HH TPOR-HL TPOR-LH TPOR-LL TWD-HH TWD-HL TWD-LH TWD-LL TRST-HH TRST-HL TRST-LH TRST-LL td fosc Tw TADJ-H/L TADJ-H/L CK CK WS WS SCK Vcc
Ta=25C ( VIN = 12V ) *1
SYMBOL VREG VLINE VLOAD VOL ILEAK VIH
PIN Vcc Vcc Vcc Vcc
---------------------
TEST CONDITION Ta=-40~105C Ta=-40~125C VIN=6~40V ILOAD=1~200mA
MIN. 4.85 4.82 -
TYP. 5.0 5.0 0.1 0.2 0.01 Vcc X60% Vcc X40% 0.7 95 95 4.40 0.15 50 200 50 100 50 100 25 50 5 10 2.5 5 10 32 -
MAX. 5.15 5.15 0.5 1.0 0.3 5 -
UNIT V % % %/C V A
RESET
---------------------
IOL=2mA
---------------------
-
RESET
VIN(RESET)=Vcc
TC VIN(TADJ-H/L)=0~Vcc -5 0.8Vcc -5 0.8Vcc -5 0.8Vcc Vcc-0.5 0.385 4.22 0.05 42.5 170 42.5 85 42.5 85 21.25 42.5 4 8 2 4 *1 27.2 3
Ta=-40~125C ( VIN = 12V ) *1
V 5 0.2Vcc 5 0.2Vcc 5 0.2Vcc 0.5 0.945140 150 4.55 0.25 57.5 230 57.5 115 57.5 115 28.75 57.5 6 12 3 6 36.8 A V A V A V A V V V
VIN(CK)=0~Vcc
VIN(WS)=0~Vcc
IOH=-1mA IOL=+1mA
Vcc
Power On Reset
---------------------
RESET
Hys TADJ-H=Vcc, -L=Vcc TADJ-H=Vcc, -L=0V TADJ-H=0V , -L=Vcc TADJ-H=0V , TADJ-H=Vcc, TADJ-H=Vcc, TADJ-H=0V, TADJ-H=0V, TADJ-H=Vcc, TADJ-H=Vcc, TADJ-H=0V, TADJ-H=0V, -L=0V -L=Vcc -L=0V -L=Vcc -L=0V -L=Vcc -L=0V -L=Vcc -L=0V
ms
Watchdog Timer
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RESET
ms
Reset Timer
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RESET
---------------------
ms
Reset Delay Time
Oscillator Clock Pulse Width *1 : RT=480k , CT=75pF
RESET SCK CK
s kHz s
The rated value for current consumption is the value that applies when the load current ILOAD=0mA. *2 : The rated oscillator frequency, power-on reset, watchdog timer and reset timer values are guaranteed only for the IC itself and do not include any variation caused by external CT and RT components. Such variation should be taken into account in the practical application of the IC.
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for practical use of the IC.
RECOMMENDED CONDITION
CT(min) Part Name CT RT & RT(max) 36 1000 CT(typ) & RT(typ) 75 480 CT(max) & RT(min) 750 48 pF k Unit
EXAMPLE OF APPLICATION CIRCUIT
VB
Rs C1
VIN Vs OUT
5.0V 4700pF
COMP Vcc
VDD C2
TB9001FN
RT 480k CT 75pF
TC TR
Current Limiter
Constant Voltage
5V Monitor
CPU
32kHz OSC
Reset Timer Logic
L H
RESET CK SCK
Po1 XCIN
WS
TADJ
*:
Caution for Wiring 1. C1 and C2 are for absorbing disturbance, noise, etc. Connect them as close to the IC as possible. 2. C3 is for phase compensation. As with C1 and C2 above, connect C3 as close to the IC as possible. 3. Connect 15-pin NC terminal to Gnd to minimize the influence from SCK pin on other pins. 4. Ensure that the IC is mounted correctly. Failing to do so may result in the IC or target equipment being damaged. 5. The application circuit shown above is not intended to guarantee mass production. A thorough evaluation is required when designing an application circuit for mass production.
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PACKAGE DIMENSION
Unit : mm
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RESTRICTIONS ON PRODUCT USE
* The information contained herein is subject to change without notice.
030619EBA
* The information contained herein is presented only as a guide for the applications of our products. No responsibility is assumed by TOSHIBA for any infringements of patents or other rights of the third parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of TOSHIBA or others. * TOSHIBA is continually working to improve the quality and reliability of its products. Nevertheless, semiconductor devices in general can malfunction or fail due to their inherent electrical sensitivity and vulnerability to physical stress. It is the responsibility of the buyer, when utilizing TOSHIBA products, to comply with the standards of safety in making a safe design for the entire system, and to avoid situations in which a malfunction or failure of such TOSHIBA products could cause loss of human life, bodily injury or damage to property. In developing your designs, please ensure that TOSHIBA products are used within specified operating ranges as set forth in the most recent TOSHIBA products specifications. Also, please keep in mind the precautions and conditions set forth in the "Handling Guide for Semiconductor Devices," or "TOSHIBA Semiconductor Reliability Handbook" etc.. * The TOSHIBA products listed in this document are intended for usage in general electronics applications (computer, personal equipment, office equipment, measuring equipment, industrial robotics, domestic appliances, etc.). These TOSHIBA products are neither intended nor warranted for usage in equipment that requires extraordinarily high quality and/or reliability or a malfunction or failure of which may cause loss of human life or bodily injury ("Unintended Usage"). Unintended Usage include atomic energy control instruments, airplane or spaceship instruments, transportation instruments, traffic signal instruments, combustion control instruments, medical instruments, all types of safety devices, etc.. Unintended Usage of TOSHIBA products listed in this document shall be made at the customer's own risk. * The products described in this document are subject to the foreign exchange and foreign trade laws. * TOSHIBA products should not be embedded to the downstream products which are prohibited to be produced and sold, under any law and regulations.
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