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TA8044AF
TOSHIBA BIPOLAR LINEAR INTEGRATED CIRCUIT SILICON MONOLITHIC
TA8044AF
3.3V / 5V DUAL-VOLTAGE REGULATOR WITH WATCHDOG TIMER
Designed specifically for use in 3.3V microcomputers, this IC contains two constant-voltage power supplies for 3.3V and 5V uses and various system reset functions. This IC's Power Supply Output 1 provides an output voltage of 3.4V and contains an output transistor capable of producing 10mA of output current. With an external boost transistor connected, this IC can supply a large output current. A 150mA current limiter is included. Power Supply Output 2 provides an output voltage of 5.0V which can be turned on or off from the EN pin. This output uses an external output transistor. Any desired current limiter value can be set using an external adjusting resistor. For a system reset, it has a low-voltage monitor / power-on reset / watchdog timer at Power Supply Output 2.
Weight: 0.14 g (typ.)
FEATURES
l Power Supply Output 1 * Output voltage * Output current * Current limiter l Power Supply Output 2 * Output voltage * Output current * Current limiter l Reset functions l Low standby current : 3.4V0.15V : 10mA (built-in transistor) / 300 mA (when urrent boost transistor connected) : 150mA : 5.0V (-0.18V to +0.15V) : 600mA (External transistor) : Variable using external adjusting resistor : Low-voltage monitor and power-on watchdog timer : 800A (Max)
l Wide operating temperature range : -40C to 125C l Compact flat package SSOP-16pin : 16-pin SSOP
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TA8044AF
BLOCK DIAGRAM AND PIN ASSIGNMENT
VIN2 16 VS2 15 70 kW
0.3 V
OUT2 14
VCC2 13 13.9 kW
COMP2 12
VCC3 11 1 kW
CK 10
TC 9
0.34 kW
Current Limiter
5 V REG Amp
Power On Reset Watchdog Timer
6.8 V 10 kW 8 kW 5 COMP1 6 EN
6.8 V 1.245 V Vref
4.6 kW
6.0 V
Comp
Current Limiter
3.3 V REG Amp
18 mV
50 kW
120 mW 1 VIN1 2 VS1
10 kW 3 OUT1 4
165 kW VCC1
100 kW 7 GND 8
RESET
100 kW
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PIN DESCRIPTION
PIN No. 1 2 SYMBOL VIN1 VS1 OUT1 DESCRIPTION Power supply input pin for VCC1. It contains a 150mA (Typ.) current limiter. Current limiter pin for VCC1. A 120msense resistor is included between pin 1 and this pin. Power supply input pin for VCC1. When using an external current boost transistor, connect the base of a PNP transistor to this pin. No external transistor is required when using the IC at a load current of 10mA or less. In this case, connect the power supplies by shorting pins 1, 2, and 3. Voltage detection / output pin for VCC1. When using a current boost transistor, connect the collector of a PNP transistor to this pin. When used with a load current of 10mA or less, this pin serves as an output pin for the 3.3V power supply. Phase compensating pin for VCC1. Connect a phase compensating capacitor between pin 4 and this pin. On / off control pin for VCC2. The 5V output is turned on when EN is high and turned off when EN is low. A 50k pull-down resistor is included in GND. Grounded Power-on reset / watchdog timer reset output pin. Generates a reset signal that is determined by CT and RT at the TC pin. If no clock is fed to the CK input, this pin generates a reset pulse intermittently. This is an NPN transistor collector output, with a 100k pull-up resistor built into VCC2. Time setup pin for the reset and watchdog timers. Connect resistor RT to VCC2 and capacitor CT to GND. Clock input pin for the watchdog timer. If used only as a power-on reset timer, pull up this input to VCC2. This pin contains a 7.5V Zener diode. To use this pin, short it to pin 13. When the VCC2 voltage becomes abnormal, the Zener diode suppresses the voltage. Phase compensating pin for VCC2. Connect a phase compensating capacitor between pin 13 and this pin. Voltage detection pin for the 5V constant-voltage power supply, VCC2. It also supplies power to the reset timer block. 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 5V. Since the recommended current of IOUT is 5mA, an output current of up to 600mA can be flowed if HFE of the external transistor is 120 or more. Detection pin for the VCC2 current limiter. A voltage drop occurring in the external resistor Rs between pins 15 and 16 is monitored. The current limiter is actuated when the voltage drop exceeds 0.3V. Ex. ) When the current limiter need to be actuated at a load current of 600mA Rs = 0.3V / 600mA = 0.5 Power supply input pin. An internal 6V constant voltage is connected to this pin for supplying power to the VCC1 / 2 current limiters, voltage regulating circuit for VCC1, reference voltage source, and the EN input circuit.
3
4
VCC1 COMP1 EN GND
5 6 7
8
RESET
9 10 11 12 13
TC CK VCC3 COMP2 VCC2
14
OUT2
15
VS2
16
VIN2
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TA8044AF
TIMING CHART
5V VTH2 VCC-2 0V VCC-1 0V VTH1 3.3 V VTH1 VTH1 VTH2
TC 0V
CK 0V
RESET
0V TRST TPOR TWD TPOR TPOR
Note:
See Electrical Characteristics for symbols in the timing chart.
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MAXIMUM RATINGS (Ta = 25C)
CHARACTERISTIC Input Voltage Output Current Operating Temperature Storage Temperature Lead Temperature-Time SYMBOL VIN IOUT1 IOUT2 Topr Tstg Tsol RATING 60 (1s) 10 10 -40~125 -55~150 260 (10s) UNIT V mA C C C
SSOP16- P-225 HEAT RESISTANCE DATA (Ta = 25C)
CHARACTERISTIC Rj-a Rj-a PD1 PD2 RATING 330 160 0.38 0.78 CONDITION Single unit 50 x 50 x 1.6 mm 30%Cu Single unit 50 x 50 x 1.6 mm 30%Cu UNIT C/W C/W W W
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ELECTRICAL CHARACTERISTICS
Vin = 6 to 16V, ILOAD-1 = 10mA, ILOAD-2 = 10mA, Ta = -40~125C unless otherwise specified
TEST CIRCUIT *1 *1 VCC-1 VCC-2-VTH2 VCC-1-VTH1 VIN = 14V , EN = " L " VIN = 14V , EN = " H " VIN = 5V IOL = 2mA VIN = VCC2 VIN = 0~3.5V VIN=5V TEST CONDITION Ta = -40~105C Ta = -40~125C Ta = -40~105C Ta = -40~125C VIN = 6~40V ILOAD = 1~200mA ILOAD = 1~300mA MIN 3.28 3.25 4.85 4.82 2 -3 2 3.0 0.2 4.5 0.25 TYP. 3.4 3.4 5.0 5.0 0.1 0.2 0.2 0.01 0.1 4 2 0.18 150 0.3 400 3 3.15 0.25 4.7 0.30 MAX 3.52 3.55 5.15 5.15 0.5 1.0 1.0 0.2 0.8 0.3 5 3 0.35 0.5 800 5 3.3 0.3 4.87 0.35 V % % % / C mA V V A A V mA V mA V A mA V UNIT
CHARACTERISTIC
SYMBOL
PIN
VREG-1 Output Voltage VREG-2 Input Stability Load Stability Temperature Coefficient Input Current Input Voltage Output Voltage Output Leakage Current Input Current Threshold Voltage Input Current Input Voltage Current Limiter Current Limiter Detection Standby Current Current Consumption IIN VIH VIL VOL ILEAK IIN VIH VIL IIN VIH VIL ILIMIT VLIMIT IST ICC VTH1 Reset Detection Voltage VTH1 VTH2 VTH2 Power-on Reset Watchdog Timer Reset Timer Clock Pulse Width TPOR TWD TRST TW VLINE VLOAD-1 VLOAD-2
VCC-1
VCC-2 VCC-1 / 2 VCC-1 VCC-2 VCC-1 / 2 EN EN
RESET RESET
TC TC CK CK VCC-1 VCC-2
VCC-2
RESET RESET RESET
1.6x 1.9x 1.3x CTxRT CTxRT CTxRT 1.1x 1.3 x 0.9x CTxRT CTxRT CTxRT 0.3x CT 3 0.7x CT 1.5x CT s ms
CK
Note1: The unit for CT is F, the unit for RT is k. *1 See EXAMPLE OF APPLICATION CIRCUIT(1) Note2: The specification values of power-on reset, watchdog timer and reset timer above are intended to guarantee the IC itself. Note that the fluctuations of CT and RT values should be taken into consideration for practical use of the IC.
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EXAMPLE OF APPLICATION CIRCUIT (1)
C3 VB 10 mF C1 RS 10 mF 5.0 V 4700 pF C4 2200 pF 16 VIN2 15 VS2 14 13 12 11 OUT2 VCC2 COMP2 VCC3 TA8044AF VIN1 1 VS1 2 OUT1 VCC1 COMP1 3 4 5 4700 pF EN 6 GND RESET 7 8
RESET
Built-in 3.3V power supply +5V power supply
RT Clock
10 CK
9 TC
CT
3.3 V 10 mF C2 IGN KEY
3.3 V
EXAMPLE OF APPLICATION CIRCUIT (2)
3.3V power supply with current boost transistor +5V power supply, 5V / 3V series connected
C3 VB 10 mF C1 RS 10 mF 4700 pF 5.0 V C4 2200 pF 16 VIN2 15 VS2 14 13 12 11 OUT2 VCC2 COMP2 VCC3 TA8044AF VIN1 1 VS1 2 OUT1 VCC1 COMP1 3 4 5 EN 6 GND RESET 7 8
RESET
VDD 5.0 V RT Po1
10 CK
9 TC
CT
CPU
4700 pF
3.3 V
VDD 3.3 V
VSS
10 mF
C2
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TA8044AF
EXAMPLE OF APPLICATION CIRCUIT (3)
3.3V power supply with current boost transistor +5V power supply, 5V / 3V parallel connected
C3 VB 10 mF C1 RS 10 mF 4700 pF 5.0 V C4 2200 pF 16 VIN2 15 VS2 14 13 12 11 OUT2 VCC2 COMP2 VCC3 TA8044AF VIN1 1 VS1 2 OUT1 VCC1 COMP1 3 4 5 EN 6 GND RESET 7 8
RESET
VDD 5.0 V RT Po1
10 CK
9 TC
CT
CPU
4700 pF
3.3 V
VDD 3.3 V
VSS
RECOMMENDED CONDITIONS
PART NAME CT RT MIN 0.01 5 MAX 100 100 UNIT F k
APPLICATION CIRCUIT FOR CK INPUT
Capacitor Coupling Timing Chart
5V 0
C2
IGN KEY
10 mF
* IN TA8044AF 5V 0 IN 2200 pF * CK
9
10 CK
0
The capacitor coupling allows reset pulses to be supplied intermittently from the RESET pin whether the input level (IN) is high or low.
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PACKAGE DIMENSIONS
Weight: 0.14g (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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