MCP1824T-3302E/OT Microchip Technology, MCP1824T-3302E/OT Datasheet - Page 20

• Manufacturer Part Number: MCP1824T-3302E/OT
• Description: IC LDO REG 300MA 3.3V SOT23-5
• Manufacturer: Microchip Technology

Specifications of MCP1824T-3302E/OT

• Regulator Topology: Positive Fixed
• Voltage - Output: 3.3V
• Voltage - Input: Up to 6V
• Voltage - Dropout (typical): 0.2V @ 300mA
• Number Of Regulators: 1
• Current - Output: 300mA (Min)
• Operating Temperature: -40°C ~ 125°C
• Mounting Type: Surface Mount
• Package / Case: SOT-23-5, SC-74A, SOT-25
• Primary Input Voltage: 3.62V
• Output Voltage: 3.3V
• Dropout Voltage Vdo: 200mV
• No. Of Pins: 5
• Output Current: 300mA
• Voltage Regulator Case Style: SOT-23
• Operating Temperature Range: -40°C To +125°C
• Output Voltage Fixed: 3.3V
• Rohs Compliant: Yes
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Current - Limit (min): -
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant, Lead free / RoHS Compliant
• Other names: MCP1824T-3302E/OTTR

MCP1824/MCP1824S
4.6
The SHDN input is an active-low input signal that turns
the LDO on and off. The SHDN threshold is a
percentage of the input voltage. The typical value of
this shutdown threshold is 30% of V
and maximum limits over the entire operating
temperature range of 45% and 15%, respectively.
The SHDN input will ignore low-going pulses (pulses
meant to shut down the LDO) that are up to 400 ns in
pulse width. If the shutdown input is pulled low for more
than 400 ns, the LDO will enter Shutdown mode. This
small bit of filtering helps to reject any system noise
spikes on the shutdown input signal.
On the rising edge of the SHDN input, the shutdown
circuitry has a 30 µs delay before allowing the LDO
output to turn on. This delay helps to reject any false
turn-on signals or noise on the SHDN input signal. After
the 30 µs delay, the LDO output enters its soft-start
period as it rises from 0V to its final regulation value. If
the SHDN input signal is pulled low during the 30 µs
delay period, the timer will be reset and the delay time
will start over again on the next rising edge of the
SHDN input. The total time from the SHDN input going
high (turn-on) to the LDO output being in regulation is
typically 100 µs. See
the SHDN input.
FIGURE 4-4:
Diagram.
DS22070A-page 20
V
SHDN
OUT
30 µs
Shutdown Input (SHDN)
T
70 µs
OR
Figure 4-4
Shutdown Input Timing
for a timing diagram of
400 ns (typ)
IN
, with minimum
4.7
Dropout voltage is defined as the input-to-output
voltage differential at which the output voltage drops
2% below the nominal value that was measured with a
V
MCP1824S LDO has a very low dropout voltage
specification of 210 mV (typical) at 300 mA of output
current. See Section 1.0 “Electrical Characteristics”
for maximum dropout voltage specifications.
The MCP1824/MCP1824S LDO operates across an
input voltage range of 2.1V to 6.0V and incorporates
input Undervoltage Lockout (UVLO) circuitry that keeps
the LDO output voltage off until the input voltage
reaches a minimum of 2.00V (typical) on the rising
edge of the input voltage. As the input voltage falls, the
LDO output will remain on until the input voltage level
reaches 1.82V (typical).
Since the MCP1824/MCP1824S LDO undervoltage
lockout activates at 1.82V as the input voltage is falling,
the dropout voltage specification does not apply for
output voltages that are less than 1.8V.
For high-current applications, voltage drops across the
PCB traces must be taken into account. The trace
resistances can cause significant voltage drops
between the input voltage source and the LDO. For
applications with input voltages near 2.1V, these PCB
trace voltage drops can sometimes lower the input
voltage enough to trigger a shutdown due to
undervoltage lockout.
4.8
The MCP1824/MCP1824S LDO has temperature-
sensing circuitry to prevent the junction temperature
from exceeding approximately 150
junction temperature does reach 150
output will be turned off until the junction temperature
cools to approximately 140
output will automatically resume normal operation. If
the internal power dissipation continues to be
excessive, the device will again shut off. The junction
temperature of the die is a function of power
dissipation, ambient temperature and package thermal
resistance. See Section 5.0 “Application Circuits/
Issues” for more information on LDO power
dissipation and junction temperature.
R
+ 0.5V differential applied. The MCP1824/
Dropout Voltage and Undervoltage
Lockout
Overtemperature Protection
2007 Microchip Technology Inc.
°
C, at which point the LDO
°
C. If the LDO
°
C, the LDO