TB9000F Datasheet, PDF (3/11 Pages) Toshiba Semiconductor – 5V VOLTAGE REGULATOR WITH WATCHDOG TIMER

Pin Description
TB9000F
Pin No.
1
3
4
5
6
8
9
11
13
14
2, 7, 10,
12, 15, 16
Symbol
V_IN
V_S
OUT
COMP
V_CC
GND
RESET
TC
CK
WS
NC
Description
Power supply input pin. It contains current limiter and startup circuit.
Detection pin for the V_CC current limiter.
A voltage drop occurring in the external resistor R_S between pins V_IN and V_S 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
R_S = 0.3 V/600 mA = 0.5 Ω
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 current of I_OUT is 8 mA, an output current of 600 mA can be flowed if
H_FE of the external transistor is 80 or more.
Phase compensating pin for V_CC.
Connect a phase compensating capacitor between pin V_CC and this pin.
Voltage detection pin for the 5 V constant-voltage power supply, V_CC.
It also supplies power to the reset timer circuit.
Grounded
Reset output pin for power on reset and watchdog timer.
● Generates a reset signal which 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 V_CC.
Time setup pin for the reset and watchdog timers. Connect capacitor CT to GND.
The time is set up by internal constant current.
Clock input pin for the watchdog timer.
This pin detects rising edge of the input signal and does not require external coupling
capacitor.
Watchdog timer function ON/OFF control pin.
Set to "Low" for active mode and "High" for inactive mode.
Not connected. (Electrically, this pin is completely open.)
3
2003-10-16