TA8044AF datasheet(3/10 Pages) TOSHIBA

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TA8044AF

2002-02-27

PIN DESCRIPTION

PIN No.

SYMBOL

DESCRIPTION

VIN1

Power supply input pin for VCC1. It contains a 150mA (Typ.) current limiter.

VS1

Current limiter pin for VCC1. A 120mΩsense resistor is included between pin 1 and this pin.

OUT1

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

VCC1

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.

COMP1

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 50kΩ pull-down resistor is included in GND.

GND

Grounded

RESET

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 100kΩ 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.

VCC3

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.

COMP2

Phase compensating pin for VCC2. Connect a phase compensating capacitor between pin 13

and this pin.

VCC2

Voltage detection pin for the 5V constant-voltage power supply, VCC2. It also supplies power to

the reset timer block.

OUT2

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.

VS2

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 = 0.5Ω

VIN2

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.

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