MCP2021-330E/MF Microchip Technology, MCP2021-330E/MF Datasheet - Page 9

• Manufacturer Part Number: MCP2021-330E/MF
• Description: LIN COMPATIBLE DRIVER, 3.3V REGULATOR, -40C to +125C, 8-DFN, TUBE
• Manufacturer: Microchip Technology

1.6
1.6.1
The MCP2021 has a low-drop-out voltage, positive
regulator capable of supplying 5.00 V
50 mA of load current over the entire operating
temperature range of -40°C to +125°C. With a load
current of 50 mA, the minimum input to output voltage
differential required for the output to remain in
regulation is typically +0.5V (+1V maximum over the
full operating temperature range). Quiescent current is
less than 100 µA with a full 50 mA load current when
the input to output voltage differential is greater than
+3.00V.
The regulator requires an external output bypass
capacitor for stability. The capacitor should be either
ceramic or tantalum for stable operation over the
extended temperature range. The compensation
capacitor should range from 1.0 µf – 22 µf and have a
ESR or CSR of 10 MW – 3.0W. Aluminum, film, organic
capacitors may also be used as long as they meet the
capacitance
capacitors can have ESR values down below 10 MW.
Designed for automotive applications, the regulator will
protect itself from double-battery jumps and up to +43V
load dump transients. The voltage regulator has both
short-circuit and thermal shutdown protection built-in.
Regarding the correlation between V
please refer to
voltage (V
provide stable regulation, the output Vreg will track the
input down to approximately 3.5V, at which point the
regulator will turn off. This will allow microcontrollers
with internal POR circuits to generate a clean arming of
the Power-on Reset trip point. The MCP2021 will then
monitor V
6.0V.
FIGURE 1-4:
© 2008 Microchip Technology Inc.
Internal Voltage Regulator
BB
V
BB
REG
5.0V REGULATOR
) drops below the differential needed to
and turn on the regulator when Vbb is
and
Figure 1-5
ESR
VOLTAGE REGULATOR BLOCK DIAGRAM
through 1-7. When the input
requirements.
Sampling
Network
V
BB
REF
DC
, V
±3% at up to
REG
Ceramic
and I
DD
,
Transient
Element
Pass
Fast
Loop
When the input voltage (V
tial needed to provide stable regulation, the output
V
+4.25V. The regulator will turn off the output at this
point. This will allow PIC
internal POR circuits, to generate a clean arming of the
Power-on Reset trip point. The regulator output will
stay off until V
In the start phase, the device must see at least 6.0V to
initiate operation during power up. In the Power-down
mode, the V
The regulator has a thermal shutdown. If the thermal
protection
condition, and the signals T
T
from the thermal shutdown is equal to adequate cooling
time.
REG
XD
Note:
is HIGH, the regulator will shut down. The recovery
Buffer
) will track the input down to approximately
The regulator has an overload current
limiting of approximately 100 mA. During a
short circuit, the V
V
off. After a recovery time of about three
milliseconds, the V
again. If there is no short circuit, (V
3.5V) then the V
on.
BB
circuit
REG
BB
monitor will be turned off.
is above +5.75 V
is lower than 3.5V, the V
detects
BB
REG
) drops below the differen-
XD
®
MCP202X
an
and RXD are LOW, or
REG
microcontrollers, with
REG
will be switched back
DC
over
.
will be checked
is monitored. If
V
V
DS22018C-page 9
SS
BB
REG
temperature
will turn
REG
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