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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 50.15V 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. Since its standby current is as small as 1mA, it can be connected directly to an automotive battery.
Weight: 0.79 g (Typ.)
FEATURES
* Accurate output : 5 V 0.15 V : 25 mV * Output power transistor incorporated Current capacity : Main Sub * Low standby current * Multiple protective function : :250 mA (max) :100 mA (max) Reverse battery connection, thermal-shutdown, current limiter * Difference between main and sub output voltage
: 100 mA (max)
* Power Flat Package (PFP) HSOP 20 pin
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TA8041F
BLOCK DIAGRAM AND PIN LAYOUT
NC 20
WI
19
NC 18
NC 17
SE 16
GND FIN
NC 15
TCCC 14
VSO 13
NC 12
VMO 11
50 k9
POWER ON RESET VSO COMP3
VMO COMP1 RESET TIMER
COMP2 VSO 10 k9 10 k9
SUB REG MAIN REG Vref
VMO 50 kW
1
RESET
2 TCM
3 NC
4 NC
5 CK
FIN GND
6 NC
7 NC
8 VIN
9 EN
10 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 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 (10k). 2 5 8 9 TCM CK VIN EN Pin for setting a time for the reset timer and watchdog timer. It connects to a resistor RT2 which leads to 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 VMO. 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 pin is high ; it is in standby state when the signal is low. It conects to 50k 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 is also a power supply pin for the reset timer. The ON / OFF control of power supply is possible by setting EN pin. 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 leads to VMO and a capacitor CT1 which is grounded.It conects to 50k resistor which pulled down to GND. Detection voltage select pin for power monitoring : Low : VTH1 = 4.80V, VTH2 = 4.40V High : VTH1 = 4.60V, VTH2 = 4.20V It conects to 50k 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 from the collector of an NPN transistor with a pull-up resistor (10k). Grounded. Not connected. (Electrically, this pin is completely open.)
1
RESET
11 13 14
VMO VSO TCS
16
SE
19 fin 3, 4, 6, 7, 10, 12, 15, 17, 18, 20
WI
GND NC
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TA8041F
TIMING CHART
VIN 0
5V VTH3 VTH3
VSO 0
TCS 0 EN 0
VSO 80%
VSO 80%
TPR
TPR
5V VTH2 VTH1 VTH1 VTH2
VMO 0 CLOCK 0 CK 0
0.7 V
0.7 V
VMO 80% TCM VMO 40% 0
RESET
0
WI
0 TRESET(1) TWD TRESET(2) TRESET(1)
Note: See Electrical Characteristics for symbols in the timing chart.
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TA8041F
MAXIMUM RATINGS (Ta = 25C)
CHARACTERISTIC SYMBOL VIN1 Input Voltage VIN2 VIN3 VIN4 ILOAD-M Output Current ILOAD-S IOUT Output Voltage Power Dissipation Operating Temperature Storage Temperature Lead Temperature-time VOUT PD Topr Tstg Tsol PIN VIN VIN CK EN, SE VMO VSO
RESET , WI RESET , WI
RATING
UNIT
40 (1 s)
-30 (Note) -5~VSO -0.5~VIN 250 100 2 VSO 2.0 -40~105 -55~150 260 (10 s) V W C C C mA V
3/4 3/4 3/4 3/4
Note: Reverse Battery
MAXIMUM OUTPUT CURRENT (RECOMMENDED VALUES FOR APPLICATION Ta = 25C)
Ambient Temperature Ta (C) Heat Radiation Condition PD4 : IC itself 25 PD3 : Using a board PD2 : Using a board PD4 : IC itself 85 PD3 : Using a board PD2 : Using a board PD4 : IC itself 105 PD3 : Using a board PD2 : Using a board Allowable Power Dissipation (DC) PD (W) 1.0 2.0 3.2 0.52 1.04 1.67 0.36 0.72 1.15 Output Current Dissipation (DC) (mA) 75 166 275 31 79 136 17 49 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 specifiedVIN = 7~18 V, ILOAD1-M =
10 mA, ILOAD-S = 10 mA, Tc = -40~105C)
CHARACTERISTIC Operating Voltage Difference between Main and Sub Output Voltages Line Regulation Load Regulation Temperature Coefficient Drop Out Voltage between I / O Current Limiter Thermal-Shutdown Temperature Input Current SYMBOL PIN TEST CIRCUIT
TEST CONDITION
MIN
TYP.
MAX
UNIT
VSUB
VSO-VMO
VSO
VMO, VSO
4.85
-25 VIN = 7~40 V ILOAD = 1~100 mA ILOAD = 1~50 mA
5.0
3/4 2.5 0.5 0.3 0.01
5.15
25 5.0 2.0 1.0
V
mV % % %/C
VLINE
VLOAD-M VLOAD-S VMO VSO VSO
VDROP-M VDROP-S
ILIMIT TSD
VMO
VSO VMO

ILOAD = 300 mA
ILOAD = 100 mA

1.5
2.6 250 150
2.3
3.9
V
mA C
IIN
VIH VIL VOL IIN
EN, SE
EN, SE
RST , WI

VIN = 5 V VIN = 0 V
2.0
100
VSO
200
10 1.0 0.5 3
mA
V V A
Input Voltage Output Voltage Input Current Threshold Voltage Input Current
IOL = 1 mA VIN = 0~VSO
-3
TCS TCS TCM
VTH IIN
VIH

VIN = 0~3.5 V
-3
VIN = 5 V 2.0 SE = GND SE = VREG SE = GND SE = VREG
80%
3
V
mA
Threshold Voltage VIL Input Current Input Voltage IIN VIH VIL VTH1-H VTH1-L
TCM CK CK VMO VSO VIN
VMO 80% VMO 40% 0.17 VMO 96% VMO 92% VMO 88% VMO 84% VMO 84% 0.5
V 0.35 0.5 1.0 mA V mA V

Reset Threshold Voltage
VTH2-H VTH2-L VTH3
Standby Current
IST
VIN = 14 V, EN = "L"
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TA8041F
CHARACTERISTIC SYMBOL PIN TEST CIRCUIT TEST CONDITION MIN 1.3 x CT1 x RT1 0.9 x CT2 x RT2 1.3 x CT2 x RT2 300 x CT2 3 TYP. 1.6 x CT1 x RT1 1.1 x CT2 x RT2 1.6 x CT2 x RT2 700 x CT2 MAX 1.9 x CT1 x RT1 1.3 x CT2 x RT2 1.9 x CT2 x RT2 1500 x CT2 ms s ms UNIT
Power-on Reset
TPR
RESET
Watchdog Timer
TWD
RESET
Reset Timer (1) Reset Timer (2) Clock Pulse Width
TRST (1)
TRST (2) TW
RESET RESET
CK
VREG: Regulated Voltage of VSO Note: The unit for CT1 and CT2 is F, the unit for RT1 and RT2 is k.
RESET TIMER EQUIVALENT CIRCUIT
HSOP20-P-450-1.00 THERMAL RESISTANCE DATA (Ta = 25C)
CHARACTERISTIC R j-a R j-c PD1 PD2 PD3 PD4 Without a board 50 x 50 x 1.0 mm 50 x 50 x 1.6 mm Without a board Iron board mounted 50% Cu mounted TEST CONDITION RATING 125 13 9.6 3.2 2.0 1.0 UNIT C/W C/W W W W W
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TA8041F
MAX (W) PD MAX - Ta
10 9.6
MAXIMUM POWER DISSIPATION PD
8
6
4 3.2 2 1 0 0 50 100 150 200
AMBIENT TEMPERATURE Ta (C)
EXAMPLE OF APPLICATION CIRCUIT
CT1 C3
WI
C2
VSUB VMAIN
20
19
WI
18
17
16 SE
FIN GND TA8041F
15
RT1 14 TCS
13CT VSO
12
11 VMO
RESET TCM
1
2
3 RT2
4
CK 5
GND FIN 6 7
VIN 8
EN 9
10
2200 pF
GND
RESET
C2
C1
GND
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 CT1 CT2 RT1 RT2 MIN 0.01 0.01 5 5 MAX 100 100 100 100 UNIT F F k k
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PACKAGE DIMENSIONS
Weight: 0.79 g (Typ.)
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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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