TA8041F

TOSHIBA BIPOLAR LINEAR INTEGRATED CIRCUIT SILICON MONOLITHIC

TA8041F
Dual Voltage Regulator with Watchdog Timer

The TA8041F is an IC specially designed for microcomputer

systems. It incorporates a highly accurate 5±0.15V
constant-voltage power supply and various system reset
functions.
The power supply section produces two outputs : main output and
sub-output. The main output can be controlled for its on / off
through the EN pin.
For system reset, it has a voltage monitoring function as well as a
watchdog timer which can self-diagnose the microcomputer
system so that program runaway can be prevented.
It also has a reverse battery protection function, a current limiter
and a thermal protection function. Weight: 0.79 g (Typ.)
Since its standby current is as small as 1mA, it can be connected
directly to an automotive battery.

FEATURES
• Accurate output : 5 V ± 0.15 V
• Difference between main and sub output voltage
: ± 25 mV
• Output power transistor incorporated Current capacity
: Main :250 mA (max)
Sub :100 mA (max)
• Low standby current : 100 mA (max)
• Multiple protective function : Reverse battery connection, thermal-shutdown, current limiter
• Power Flat Package (PFP) HSOP 20 pin

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 TA8041F
BLOCK DIAGRAM AND PIN LAYOUT

NC WI NC NC SE GND NC TCCC VSO NC VMO

20 19 18 17 16 FIN 15 14 13 12 11

50 kΩ
POWER
ON RESET
VSO
COMP3
VMO
COMP1 RESET
TIMER

COMP2 SUB
VSO REG
MAIN
10 kΩ

10 kΩ

REG

Vref
VMO
50 kΩ

1 2 3 4 5 FIN 6 7 8 9 10
RESET TCM NC NC CK GND NC NC VIN EN NC

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 TA8041F
PIN DESCRIPTION

PIN No. SYMBOL DESCRIPTION

Watchdog timer reset pin.

・Generates a reset signal which is determined by the CT2, RT2 combination connected to the TCM
1 RESET pin.
・Intermittently generates reset pulses if no clock is supplied to the CK pin.The RESET signal is the
output from the collector of an NPN transistor with a pull-up resistor (10kΩ).
Pin for setting a time for the reset timer and watchdog timer. It connects to a resistor RT2 which leads to
2 TCM
VMO and a capacitor CT2 which is grounded.
Clock input pin for the watchdog timer. If it is used for a power-on reset timer only, it is pulled up to
5 CK
VMO.
8 VIN Power supply pin for both main and sub power supplies.
Enable pin for ON / OFF control of the main power output. The main output is 5V when the signal at this
9 EN pin is high ; it is in standby state when the signal is low. It conects to 50kΩ resistor which pulled down to
GND.
Main output pin for 5V constant-voltage power supply. It has a current capacity of up to 250mA. This pin
11 VMO is also a power supply pin for the reset timer. The ON / OFF control of power supply is possible by
setting EN pin.
13 VSO Sub output pin for 5V constant-voltage power supply. It has a current capacity of up to 100mA.
Pin for setting a time for the power-on reset timer of sub output. It connects to a resister RT1 which
14 TCS leads to VMO and a capacitor CT1 which is grounded.It conects to 50kΩ resistor which pulled down to
GND.
Detection voltage select pin for power monitoring :
Low : VTH1 = 4.80V, VTH2 = 4.40V
16 SE
High : VTH1 = 4.60V, VTH2 = 4.20V
It conects to 50kΩ resistor which pulled down to GND.
Reset detect voltage VTH1 output pin. The reset detect voltage has a hysteresis of 0.2V. It is the output
19 WI
from the collector of an NPN transistor with a pull-up resistor (10kΩ).
fin GND Grounded.
3, 4, 6, 7,
10, 12, 15, NC Not connected. (Electrically, this pin is completely open.)
17, 18, 20

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 TA8041F
TIMING CHART

VIN

0
5V

VTH3
VTH3
VSO

VSO × 80% VSO × 80%

TCS

0 TPR
TPR

EN

0
5V
VTH1 VTH1
VTH2 VTH2
VMO

0.7 V 0.7 V
0

CLOCK
0

CK
0

VMO × 80%

TCM

VMO × 40%
0

RESET

WI
0
TRESET(2)
TRESET(1) TWD TRESET(1)

Note: See Electrical Characteristics for symbols in the timing chart.

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 TA8041F
MAXIMUM RATINGS (Ta = 25°C)

CHARACTERISTIC SYMBOL PIN RATING UNIT

VIN1 VIN 40 (1 s)
VIN2 VIN −30 (Note)
Input Voltage V
VIN3 CK −5~VSO
VIN4 EN, SE −0.5~VIN
ILOAD-M VMO 250
Output Current ILOAD-S VSO 100 mA

IOUT RESET , WI 2
Output Voltage VOUT RESET , WI VSO V
Power Dissipation PD  2.0 W
Operating Temperature Topr  −40~105 °C
Storage Temperature Tstg  −55~150 °C
Lead Temperature-time Tsol  260 (10 s) °C

Note: Reverse Battery

MAXIMUM OUTPUT CURRENT (RECOMMENDED VALUES FOR APPLICATION Ta = 25°C)

Allowable Power Output Current

Ambient Temperature Heat Radiation
Dissipation Dissipation
Ta (°C) Condition
(DC) PD (W) (DC) (mA)

PD4 : IC itself 1.0 75

25 PD3 : Using a board 2.0 166
PD2 : Using a board 3.2 275
PD4 : IC itself 0.52 31
85 PD3 : Using a board 1.04 79
PD2 : Using a board 1.67 136
PD4 : IC itself 0.36 17
105 PD3 : Using a board 0.72 49
PD2 : Using a board 1.15 89

Note: VCC = 16 V
Output current dissipation is the sum of main output current and sub-output current.
For PD2 and PD3 in heat radiation condition, refer to PD2 and PD3 in THERMAL RESISTANCE DATA

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 TA8041F
ELECTRICAL CHARACTERISTICS(Unless otherwise specified、
、VIN = 7~18 V, ILOAD1-M =
10 mA, ILOAD-S = 10 mA, Tc = −40~105°C)
TEST
CHARACTERISTIC SYMBOL PIN CIR- TEST CONDITION MIN TYP. MAX UNIT
CUIT
Operating Voltage VSUB VSO ― 4.85 5.0 5.15 V
Difference between
Main and Sub VSO-VMO VMO, ― −25  25 mV
Output Voltages VSO
Line Regulation VLINE ― VIN = 7~40 V ― 2.5 5.0 %

VLOAD-M VMO ― ILOAD = 1~100 mA ― 0.5 2.0

Load Regulation %
VLOAD-S VSO ― ILOAD = 1~50 mA ― 0.3 1.0
Temperature
VSO ― ― 0.01 ― %/°C
Coefficient

Drop Out Voltage VDROP-M VMO ― ILOAD = 300 mA ― 1.5 2.3

between I / O V
VDROP-S VSO ― ILOAD = 100 mA ― 2.6 3.9

Current Limiter ILIMIT VMO ― ― 250 ― mA

Thermal-Shutdown
TSD ― ― 150 ― °C
Temperature

VIN = 5 V ― 100 200

Input Current IIN EN, SE ― µA
VIN = 0 V ― ― 10

VIH ― 2.0 ― ―
Input Voltage EN, SE V
VIL ― ― ― 1.0
Output Voltage VOL RST , WI ― IOL = 1 mA ― ― 0.5 V
Input Current IIN TCS ― VIN = 0~VSO −3 ― 3 µA

VSO ×
Threshold Voltage VTH TCS ― ― ― V
80%
Input Current IIN TCM ― VIN = 0~3.5 V −3 ― 3 µA

VMO ×
VIH ― ― ―
80%
Threshold Voltage TCM V
VMO ×
VIL ― ― ―
40%
Input Current IIN CK ― VIN = 5 V ― 0.17 0.35 mA
VIH ― 2.0 ― ―
Input Voltage CK V
VIL ― ― ― 0.5

VTH1-H ― SE = GND
― VMO ×
―
96%

VTH1-L ― SE = VREG
― VMO ×
―
92%
VMO
Reset Threshold Voltage VTH2-H ― SE = GND
― VMO ×
― V
88%

VTH2-L ― SE = VREG
― VMO ×
―
84%

VTH3 VSO ―
― VMO ×
―
84%

Standby Current IST VIN ― VIN = 14 V, EN = “L” ― 0.5 1.0 mA

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 TA8041F
TEST
CHARACTERISTIC SYMBOL PIN CIR- TEST CONDITION MIN TYP. MAX UNIT
CUIT
1.3 × 1.6 × 1.9 ×
Power-on Reset TPR RESET ― CT1 × CT1 × CT1 ×
RT1 RT1 RT1
0.9 × 1.1 × 1.3 ×
Watchdog Timer TWD RESET ― CT2 × CT2 × CT2 × ms
RT2 RT2 RT2
1.3 × 1.6 × 1.9 ×
Reset Timer (1) TRST (1) RESET ― CT2 × CT2 × CT2 ×
RT2 RT2 RT2
300 × 700 × 1500 ×
Reset Timer (2) TRST (2) RESET ― µs
CT2 CT2 CT2
Clock Pulse Width TW CK ― 3 ― ― µs

VREG: Regulated Voltage of VSO

Note: The unit for CT1 and CT2 is µF, the unit for RT1 and RT2 is kΩ.

RESET TIMER EQUIVALENT CIRCUIT

HSOP20-P-450-1.00 THERMAL RESISTANCE DATA (Ta = 25°C)

CHARACTERISTIC TEST CONDITION RATING UNIT

Rθ j-a ― 125 °C/W

Rθ j-c ― 13 °C/W
PD1 Without a board 9.6 W
PD2 50 × 50 × 1.0 mm Iron board mounted 3.2 W
PD3 50 × 50 × 1.6 mm 50% Cu mounted 2.0 W
PD4 Without a board 1.0 W

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 TA8041F

MAX (W)
PD MAX - Ta
10
9.6

MAXIMUM POWER DISSIPATION PD

6

3.2

0
0 50 100 150 200

AMBIENT TEMPERATURE Ta (°C)

EXAMPLE OF APPLICATION CIRCUIT

CT1

C3

C2
WI
RT1 VSUB
VMAIN

20 19 18 17 16 FIN 15 14 13CT 12 11
WI SE GND TCS VSO VMO

TA8041F

RESET TCM CK GND VIN EN

1 2 3 4 5 FIN 6 7 8 9 10
RT2
2200 pF

C1
C2

GND GND

RESET CLOCK VIN EN

*: Caution for Wiring

1. C1, C2 and C3 are for absorbing disturbance, noise, etc.

Connect them as close to the IC as possible.

RECOMMENDED CONDITIONS

PART NAME MIN MAX UNIT

CT1 0.01 100 µF

CT2 0.01 100 µF
RT1 5 100 kΩ
RT2 5 100 kΩ

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 TA8041F
PACKAGE DIMENSIONS

Weight: 0.79 g (Typ.)

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 TA8041F

RESTRICTIONS ON PRODUCT USE 000707EAA_S

• 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 information contained herein is presented only as a guide for the applications of our products. No
responsibility is assumed by TOSHIBA CORPORATION for any infringements of intellectual property or other
rights of the third parties which may result from its use. No license is granted by implication or otherwise under
any intellectual property or other rights of TOSHIBA CORPORATION or others.

• The information contained herein is subject to change without notice.

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