MCP1725 Microchip Technology, MCP1725 Datasheet - Page 19

• Manufacturer Part Number: MCP1725
• Description: Low Quiescent Current LDO Regulator
• Manufacturer: Microchip Technology

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4.8
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
a very low dropout voltage specification of 210 mV
(typical) at 0.5A of output current. See Section 1.0
“Electrical Characteristics” for maximum dropout
voltage specifications.
The MCP1725 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 MCP1725 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.
© 2006 Microchip Technology Inc.
R
+ 0.6V differential applied. The MCP1725 LDO has
Dropout Voltage and
Undervoltage Lockout
4.9
The MCP1725 LDO has temperature-sensing circuitry
to prevent the junction temperature from exceeding
approximately 150
does reach 150
until the junction temperature cools to approximately
140
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
“Application Circuits/Issues” for more information
on LDO power dissipation and junction temperature.
°
C, at which point the LDO output will automatically
Overtemperature Protection
thermal
°
C, the LDO output will be turned off
°
C. If the LDO junction temperature
resistance.
MCP1725
See
DS22026A-page 19
Section 5.0