NCV8505 ON Semiconductor, NCV8505 Datasheet - Page 9

• Manufacturer Part Number: NCV8505
• Description: Micropower 400 mA LDO Linear Regulators
• Manufacturer: ON Semiconductor

control function RESET (Figure 15).
RESET Function
powers up until V
voltage, or when V
than 4.0% below the regulated output voltage. Hysteresis is
included in the function to minimize oscillations.
controlled by a low voltage detection circuit. The circuit is
functionally independent of the rest of the IC thereby
guaranteeing that the RESET signal is valid for V
as 1.0 V.
ENABLE Function
pin is held low. The part has an internal pull down if the pin
is left floating.
battery line through an external resistor. It will withstand
load dump potentials in this configuration.
V
Up to 45 V
DELAY
V
RESET
BAT
V
OUT
The NCV8505 contains the microprocessor compatible
A RESET signal (low voltage) is generated as the IC
The RESET output is an open collector NPN transistor,
The part stays in a low I
The integrity of the ENABLE pin allows it to be tied to the
IN
Figure 15. Reset and Delay Circuit Wave Forms
10 k
REGULATOR CONTROL FUNCTIONS
T
Figure 16. ENABLE Function
d
OUT
OUT
is within 1.5% of the regulated output
drops out of regulation,and is lower
V
ENABLE
IN
Q
sleep mode when the ENABLE
NCV8505
T
GND
d
V
OUT
CIRCUIT DESCRIPTION
OUT
Threshold
Threshold
http://onsemi.com
as low
RESET
DELAY
(V
DT
)
9
DELAY Function
external capacitor) delay on the RESET output lead.
to the external DELAY capacitor during the following
proceedings:
Voltage Adjust
output voltage. The feedback to the V
a voltage divider referenced to the output voltage. The loop
is balanced around the Unity Gain threshold (1.30 V
typical).
The reset delay circuit provides a programmable (by
The DELAY lead provides source current (typically 4.0 mA)
Figure 17 shows the device setup for a user configurable
1. During Power Up (once the regulation threshold
2. After a reset event has occurred and the device is
has been verified).
back in regulation. The DELAY capacitor is
discharged when the regulation (RESET threshold)
has been violated. This is a latched incident. The
capacitor will fully discharge and wait for the
device to regulate before going through the delay
time event again.
Figure 17. Adjustable Output Voltage
NCV8505
V
V
OUT
ADJ
1.28 V
15 k
5.1 k
ADJ
≈5.0 V
pin is taken from
C
OUT