MCP1701 Microchip Technology, MCP1701 Datasheet - Page 10

• Manufacturer Part Number: MCP1701
• Description: 2 uA Low Dropout Positive Voltage Regulator
• Manufacturer: Microchip Technology

MCP1701
4.0
The MCP1701 is a low quiescent current, precision,
fixed-output voltage LDO. Unlike bipolar regulators,
the MCP1701 supply current does not increase
proportionally with load current.
4.1
A minimum of 1 µF output capacitor is required. The
output capacitor should have an effective series
resistance (esr) greater than 0.1
plus a resonant frequency above 1 MHz. Larger output
capacitors can be used to improve supply noise
rejection and transient response. Care should be taken
when increasing C
impedance is not high enough to cause high input
impedance oscillation.
FIGURE 4-1:
DS21874A-page 10
DETAILED DESCRIPTION
Output Capacitor
V
IN
OUT
MCP1701 Block Diagram.
to ensure that the input
and less than 5 ,
Short-Circuit
Reference
Protection
Voltage
GND
+
–
4.2
A 1 µF input capacitor is recommended for most
applications when the input impedance is on the order
of 10 . Larger input capacitance may be required for
stability when operating from a battery input, or if there
is a large distance from the input source to the LDO.
When large values of output capacitance are used, the
input capacitance should be increased to prevent high
source impedance oscillations.
4.3
The MCP1701 internal circuitry monitors the amount of
current flowing through the P-channel pass transistor.
In the event of a short-circuit or excessive output
current, the MCP1701 will act to limit the output current.
Input Capacitor
Overcurrent
V
OUT
2004 Microchip Technology Inc.