TB9000CFNG - TOSHIBA Semiconductor
TB9000CFNG
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.
Weight: 0.1 g (typ.)
Features
•
Accurate output: 5.0 V ± 0.15 V
•
Low current consumption: 120 μA (VIN = 12 V, Ta = 25°C) 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 125°C
•
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 COMPATIBLE", "[[G]]/RoHS [[Chemical symbol(s) of controlled substance(s)]]",
"RoHS COMPATIBLE" or "RoHS COMPATIBLE, [[Chemical 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=230°C
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=245°C
z
dipping time=5seconds
z
the number of times=once
z
use of R-type flux
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TB9000CFNG
Block Diagram & Pin Layout
NC
20
NC
19
WS
NC
18
17
CK
16
NC
15
TC
14
NC
13
NC
12
RESET
11
VCC
VCC
250kΩ
130kΩ
Watchdog timer
Power on reset
VCC
100kΩ
Vref
0.3 V
Current
limiter
5 V Reg
Amp
Comp
70 kΩ
VCC
1
2
3
4
5
6
7
8
9
10
VIN
NC
VS
NC
OUT
NC
COMP
Vcc
NC
GND
Note: Some functional blocks, circuits, or constants are omitted or simplified in the block diagram to clarify the
descriptions of the relevant features.
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TB9000CFNG
Pin Description
Pin No.
Symbol
Description
1
VIN
Power supply input pin. It contains a current limiter and startup circuit.
3
VS
Detection pin for the VCC current limiter.
Any voltage drop occurring in the external resistor RS between pins VIN and VS 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:
RS = 0.3 V/600 mA = 0.5 Ω.
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 IOUT current is 8 mA, an output current of 600 mA can be run if HFE
of the external transistor is 80 or more.
7
COMP
8
VCC
Voltage detection pin for the 5 V constant-voltage power supply, VCC.
It also supplies power to the reset timer circuit.
10
GND
Grounded
11
RESET
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 kΩ).
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 kΩ).
2, 4, 6, 9, 12, 13,
15, 17, 19, 20
NC
Not connected. (Electrically, this pin is completely open.)
Phase-compensating pin for VCC.
Connect a phase-compensating capacitor between pin VCC and this pin.
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 kΩ pull-up resistor to VCC.
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TB9000CFNG
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 Vref 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 the OP amp output together configure a closed loop.
An overcurrent protection function is incorporated as a protective measure in case a fault such as
shorting to GND occurs in the 5 V output. A current detecting resistor is inserted between the VIN and the
VS 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 prevent 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 VCC applied to
the CPU exceeds VTH. When powered off, this voltage monitoring function outputs a reset signal
immediately when VCC drops below VTH. A reset signal is also output immediately when VCC drops for
some reason during normal operation. Then, when VCC 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 power-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 VCC 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 finished in the CPU system
software, and input this clock to the CK pin of the IC. The IC’s TC pin is repeatedly charged and
discharged between 2 V and 4 V. However, when a clock is input, it switches over and starts
discharging in the middle of charging and then starts charging from 2 V again. Since the clock is
generated at predetermined intervals when the CPU system is operating normally, the TC pin switches
over and starts discharging before the charge voltage 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 use 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 pin 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 configured so that any overcurrent condition will be eliminated as soon as
possible.
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TB9000CFNG
Timing Chart 1: WS = LOW
Timing Chart 2: WS = HIGH
Note 1: Definitions of symbols used in this timing chart are provided in the Electrical Characteristics table.
Note 2: Timing charts may be simplified to clarify the descriptions of features and operations.
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TB9000CFNG
Absolute Maximum Rating (Ta = 25°C)
Characteristics
Input voltage
Symbol
Pin
Rating
VIN1
VIN, VS
45 (1 s)
VIN2
VCC
6.0
VIN3
CK, WS, TC
VCC
Unit
V
IOUT1
OUT
10
IOUT2
RESET
5
VOUT1
OUT
45 (1 s)
VOUT2
RESET
VCC
Operating temperature
Topr
―
−40 to 125
°C
Storage temperature
Tstg
―
−55 to 150
°C
Output current
Output voltage
mA
V
SSOP20-P-225-0.65A Thermal Resistance Data (Ta = 25°C)
Characteristics
Rating
Unit
Test Condition
Rθj-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 parameter values that must
not be exceeded during operation, even for an instant.
If any of these levels is exceeded during operation, the 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. Applications using the device should be designed so that the
absolute 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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TB9000CFNG
Electrical Characteristics
(Unless otherwise specified, VIN = 6 to 16 V, ILOAD = 10 mA, Ta = −40 to 125°C)
Symbol
Pin
Test
Circuit
Output voltage
VREG
VCC
―
Line regulation
VLINE
VCC
―
VIN = 6 to 40 V
Load regulation
VLOAD
VCC
―
ILOAD = 1 to 300 mA
―
VCC
―
VOL
RESET
―
ILEAK
RESET
IIN
TC
Characteristics
Temperature coefficient
Output voltage
Output leakage current
Input current
IIH
Input current
CK
IIL
IIH
Input current
WS
IIL
VIH
Input voltage
Current limiter detection
Current consumption
4.85
5.0
5.15
Ta = −40 to 125°C
4.82
5.0
5.15
―
0.1
0.5
V
%
1.0
%
―
%/°C
IOL = 2 mA
―
―
0.3
V
―
VIN( RESET ) = VCC
―
―
5
μA
―
VIN(TC) = GND
―
−10
―
μA
―
VIN(CK) = VCC
5
―
45
―
VIN(CK) = 0 V
−5
―
5
―
VIN(WS) = VCC
15
―
85
―
VIN(WS) = 0 V
−5
―
5
0.8 VCC
―
―
―
―
0.2 VCC
0.8 VCC
―
―
―
―
0.2 VCC
0.225
0.3
0.375
Ta = 25°C, VIN = 12 V
―
120
170
Ta = −40 to 125°C,
VIN = 12 V
―
120
190
4.5
4.7
4.9
0.25
0.30
0.35
VLIMIT
VIN, VS
―
ICC
―
―
VCC
―
ΔVTH
Ta = −40 to 105°C
Unit
0.2
―
VTH
Reset detection voltage
Max
0.01
WS
VIL
Typ.
―
―
VIH
Input voltage
Min
―
CK
VIL
Test Condition
VCC − VTH
μA
μA
V
V
V
μA
V
Power-on reset
TPOR
RESET
―
280
× CT
400
× CT
520
× CT
ms
Watchdog timer
TWD
RESET
―
140
× CT
200
× CT
260
× CT
ms
Reset timer
TRST
RESET
―
4.0
× CT
8.0
× CT
12.0
× CT
ms
Tw
CK
―
3
―
―
μs
Clock pulse width
Note 1: CT is measured in units of μF.
Note 2: The specification values for power-on reset, watchdog timer and reset timer above are guaranteed only for
the IC itself. Any practical application of the IC should take into account fluctuations in the CT value.
Note 3: For the above current consumption Icc, it is specified that ILOAD = 0 mA.
Operating Conditions
Part Name
Min
Typ.
Max
Unit
CT
0.01
0.25
10
μF
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TB9000CFNG
Reference Characteristics
Input – Output Characteristics
RESET Output Characteristics
6
(V)
4
VRESET
4
VCC
(V)
6
2
0
0
2
2
4
VIN
0
6
(V)
0
2
4
VCC
6
(V)
Current Limiter Characteristics
7
6
(V)
4
VCC
5
3
2
1
0
0
0.1
0.2
VLIMIT
0.3
0.4
(V)
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TB9000CFNG
Example of Application Circuit
RS
VIN
VS
Current
limiter
OUT
COMP VCC
Constant voltage
5V
monitor
TB9000CFNG
CPU
RESET
CK
Reset timer
CT
TC
C2
10 μF
VDD
470 pF
C3 1 kΩ
5.0 V
C1
10 μF
VB
RESET
Po1
WS
GND
Note 1: Caution for Wiring
C1 and C2 are for absorbing disturbances, noise, 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 intended to guarantee mass production. A thorough evaluation is
required when designing an application circuit for mass production.
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TB9000CFNG
Package Dimensions
Weight: 0.1 g (typ.)
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TB9000CFNG
RESTRICTIONS ON PRODUCT USE
• Toshiba Corporation, and its subsidiaries and affiliates (collectively “TOSHIBA”), reserve the right to make changes to the information
in this document, and related hardware, software and systems (collectively “Product”) without notice.
• This document and any information herein may not be reproduced without prior written permission from TOSHIBA. Even with
TOSHIBA’s written permission, reproduction is permissible only if reproduction 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 situations in which a malfunction or failure of Product could cause loss of human life, bodily
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, customers must also refer to and comply with (a) the latest versions of
all relevant TOSHIBA information, including without limitation, this document, the specifications, the data sheets and application notes
for Product and the precautions and conditions set forth in the “TOSHIBA Semiconductor Reliability Handbook” and (b) the
instructions for the application with which the Product will be used with or for. Customers are solely responsible for all aspects of their
own product design or applications, including but not limited to (a) determining the appropriateness of the use of this Product in such
design or applications; (b) evaluating and determining the applicability of any information contained in this document, or in charts,
diagrams, programs, algorithms, sample application circuits, or any other referenced documents; and (c) validating all operating
parameters for such designs and applications. TOSHIBA ASSUMES NO LIABILITY FOR CUSTOMERS’ PRODUCT DESIGN OR
APPLICATIONS.
• Product is intended for use in general electronics applications (e.g., computers, personal equipment, office equipment, measuring
equipment, industrial robots and home electronics appliances) or for specific applications as expressly stated in this document.
Product is neither intended nor warranted for use in equipment or systems that require extraordinarily high levels of quality and/or
reliability and/or a malfunction or failure of which may cause loss of human life, bodily injury, serious property damage or serious
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 signaling
equipment, equipment used to control combustions or explosions, safety devices, elevators and escalators, devices related to electric
power, and equipment used in finance-related fields. Do not use Product for Unintended Use unless specifically permitted in this
document.
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• 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 presented only as guidance for Product use. No responsibility is assumed by TOSHIBA for any
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 PROVIDED 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, CONSEQUENTIAL, SPECIAL, OR INCIDENTAL DAMAGES OR
LOSS, INCLUDING WITHOUT LIMITATION, LOSS OF PROFITS, 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 software or technology for any military purposes, including without
limitation, for the design, development, use, stockpiling or manufacturing of nuclear, chemical, or biological weapons or missile
technology products (mass destruction weapons). Product and related software and technology may be controlled under the
Japanese Foreign Exchange and Foreign Trade Law and the U.S. Export Administration Regulations. Export and re-export of Product
or related software or technology are strictly prohibited except in compliance with all applicable export laws and regulations.
• Please contact your TOSHIBA sales representative for details as to environmental matters such as the RoHS compatibility of Product.
Please use Product in compliance with all applicable laws and regulations that regulate the inclusion or use of controlled substances,
including without limitation, the EU RoHS Directive. TOSHIBA assumes no liability for damages or losses occurring as a result of
noncompliance with applicable laws and regulations.
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