MCP1754 Microchip Technology Inc., MCP1754 Datasheet - Page 17

• Manufacturer Part Number: MCP1754
• Description: 150 Ma, 16v, High Performance Ldo
• Manufacturer: Microchip Technology Inc.

4.0
The MCP1754/MCP1754S is a 150 mA output current,
Low Dropout (LDO) voltage regulator. The low dropout
voltage of 300 mV typical at 150 mA of current makes
it ideal for battery-powered applications. The input
voltage range is 3.6V to 16.0V. Unlike other high output
current LDOs, the MCP1754/MCP1754S typically
draws only 150 µA of quiescent current for a 150 mA
load. The MCP1754 adds a shutdown control input pin
and a power good output pin. The output voltage
options are fixed.
4.1
The MCP1754/MCP1754S LDO has a fixed output
voltage. The output voltage range is 1.8V to 5.5V.
4.2
The MCP1754/MCP1754S LDO is tested and ensured
to supply a minimum of 150 mA of output current. The
MCP1754/MCP1754S has no minimum output load, so
the output load current can go to 0 mA and the LDO will
continue to regulate the output voltage to within
tolerance.
The MCP1754/MCP1754S also incorporates a true
output current foldback. If the output load presents an
excessive load due to a low impedance short circuit
condition, the output current and voltage will fold back
towards 30 mA and 0V respectively.
The output voltage and current will resume normal
levels when the excessive load is removed. If the
overload condition is a soft overload, the MCP1754/
FIGURE 4-1:
© 2011 Microchip Technology Inc.
DEVICE OVERVIEW
LDO Output Voltage
Output Current and Current
Limiting
Typical Current Foldback.
6
5
4
3
2
2
1
0
0.000
Typical Current FoldBack - 5V Output
0.050
Increasing Load
0.100
I
OUT
(A)
MCP1754/MCP1754S
MCP1754S will supply higher load currents of up to
typically 250 mA. This allows for device usage in
applications that have pulsed load currents having an
average output current value of 150 mA or less.
Output overload conditions may also result in an over-
temperature shutdown of the device. If the junction
temperature rises above 150°C (typical), the LDO will
shut
“Overtemperature Protection”
on overtemperature shutdown.
4.3
The MCP1754/MCP1754S requires a minimum output
capacitance of 1 µF for output voltage stability. Ceramic
capacitors are recommended because of their size,
cost and environmentally robust qualities.
Aluminum-electrolytic and tantalum capacitors can be
used on the LDO output as well. The Equivalent Series
Resistance (ESR) of the electrolytic output capacitor
should be no greater than 2.0 Ω. The output capacitor
should be located as close to the LDO output as is
practical. Ceramic materials X7R and X5R have low
temperature coefficients and are well within the
acceptable ESR range required. A typical 1 µF X7R
0805 capacitor has an ESR of 50 milliohms.
Larger LDO output capacitors can be used with the
MCP1754/MCP1754S
performance and power supply ripple rejection
performance.
recommended. Aluminum-electrolytic capacitors are
not recommended for low temperature applications of
< -25°C.
0.150
Decreasing Load
down
Output Capacitor
0.200
A
the
maximum
output.
to
0.250
improve
for more information
See
of
DS22276A-page 17
1000 µF
Section 4.8
dynamic
is