MCP1703T-1502E/MC MICROCHIP [Microchip Technology], MCP1703T-1502E/MC Datasheet - Page 15

• Manufacturer Part Number: MCP1703T-1502E/MC
• Description: 250 mA, 16V, Low Quiescent Current LDO Regulator
• Manufacturer: MICROCHIP [Microchip Technology]

5.0
The MCP1703 CMOS low dropout linear regulator is
intended for applications that need the lowest current
consumption
regulation. The operating continuous load range of the
MCP1703 is from 0 mA to 250 mA (V
input operating voltage range is from 2.7V to 16.0V,
making it capable of operating from two or more
alkaline cells or single and multiple Li-Ion cell batteries.
5.1
The input of the MCP1703 is connected to the source
of the P-Channel PMOS pass transistor. As with all
LDO circuits, a relatively low source impedance (10Ω)
is needed to prevent the input impedance from causing
the LDO to become unstable. The size and type of the
capacitor needed depends heavily on the input source
type (battery, power supply) and the output current
range of the application. For most applications (up to
100 mA), a 1 µF ceramic capacitor will be sufficient to
ensure circuit stability. Larger values can be used to
improve circuit AC performance.
© 2009 Microchip Technology Inc.
FUNCTIONAL DESCRIPTION
Input
while
maintaining
output
R
≥ 2.5V). The
voltage
5.2
The maximum rated continuous output current for the
MCP1703 is 250 mA (V
where V
200 mA.
A minimum output capacitance of 1.0 µF is required for
small signal stability in applications that have up to
250 mA output current capability. The capacitor type
can be ceramic, tantalum, or aluminum electrolytic. The
esr range on the output capacitor can range from 0Ω to
2.0Ω.
The output capacitor range for ceramic capacitors is
1 µF to 22 µF. Higher output capacitance values may
be used for tantalum and electrolytic capacitors. Higher
output capacitor values pull the pole of the LDO
transfer function inward that results in higher phase
shifts which in turn cause a lower crossover frequency.
The circuit designer should verify the stability by
applying line step and load step testing to their system
when using capacitance values greater than 22 µF.
5.3
When powering up the internal reference output, the
typical output rise time of 1000 µs is controlled to
prevent overshoot of the output voltage.
Output
R
Output Rise time
< 2.5V, the maximum output current is
R
≥ 2.5V). For applications
MCP1703
DS22049D-page 15