MCP1827-3302E/ET Microchip Technology, MCP1827-3302E/ET Datasheet - Page 18

• Manufacturer Part Number: MCP1827-3302E/ET
• Description: IC, LDO VOLT REG, 3.3V, 1.5A, D2-PAK-5
• Manufacturer: Microchip Technology

Specifications of MCP1827-3302E/ET

• Primary Input Voltage: 3.9V
• Output Voltage Fixed: 3.3V
• Dropout Voltage Vdo: 330mV
• No. Of Pins: 5
• Output Current: 1.5A
• Operating Temperature Range: -40°C To +125°C
• Regulator Topology: Positive Fixed
• Voltage - Output: 3.3V
• Voltage - Input: Up to 6V
• Voltage - Dropout (typical): 0.33V @ 1.5A
• Number Of Regulators: 1
• Current - Output: 1.5A (Min)
• Operating Temperature: -40°C ~ 125°C
• Mounting Type: Surface Mount
• Package / Case: TO-263-5, D²Pak (5 leads + Tab), TO-263BA
• 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

MCP1827/MCP1827S
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 Figure 4-4 for a timing diagram of
the SHDN input.
FIGURE 4-4:
Diagram.
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
MCP1827/MCP1827S LDO has a very low dropout
voltage specification of 330 mV (typical) at 1.5A of out-
put current. See Section 1.0 “Electrical Characteris-
tics” for maximum dropout voltage specifications.
The MCP1827/MCP1827S LDO operates across an
input voltage range of 2.3V 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 2.18V (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 2.04V (typical).
Since the MCP1827/MCP1827S LDO undervoltage
lockout activates at 2.04V as the input voltage is falling,
the dropout voltage specification does not apply for
output voltages that are less than 1.9V.
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 2.3V, these PCB
trace voltage drops can sometimes lower the input
voltage enough to trigger a shutdown due to
undervoltage lockout.
DS22001C-page 18
R
V
SHDN
OUT
30 µs
+
Dropout Voltage and Undervoltage
Lockout
0.6V
T
OR
70 µs
Shutdown Input Timing
differential
applied.
400 ns (typ)
The
4.8
The
ture-sensing circuitry to prevent the junction tempera-
ture 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.
cuits/Issues” for more information on LDO power
dissipation and junction temperature.
MCP1827/MCP1827S
Overtemperature Protection
See
Section 5.0
©
2007 Microchip Technology Inc.
°
C, at which point the LDO
LDO
“Application
has
°
°
C. If the LDO
C, the LDO
tempera-
Cir-