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  Microchip Technology Semiconductor Electronic Components Datasheet  


MCP1801

Low Quiescent Current LDO



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MCP1801
150 mA, High PSRR, Low Quiescent Current LDO
Features
• 150 mA Maximum Output Current
• Low Drop Out Voltage, 200 mV typical @ 100 mA
• 25 µA Typical Quiescent Current
• 0.01 µA Typical Shutdown Current
• Input Operating Voltage Range: 2.0V to10.0V
• Standard Output Voltage Options:
- 0.9V, 1.2V, 1.8V, 2.5V, 3.0V, 3.3V, 5.0V, 6.0V
• Output voltage accuracy:
- ±2% (VR > 1.5V), ±30 mV (VR 1.5V)
• Stable with Ceramic output capacitors
• Current Limit Protection
• Shutdown pin
• High PSRR: 70 dB typical @ 10 kHz
Applications
• Battery-powered Devices
• Battery-powered Alarm Circuits
• Smoke Detectors
• CO2 Detectors
• Pagers and Cellular Phones
• Wireless Communications Equipment
• Smart Battery Packs
• Low Quiescent Current Voltage Reference
• PDAs
• Digital Cameras
• Microcontroller Power
• Solar-Powered Instruments
• Consumer Products
• Battery Powered Data Loggers
Related Literature
• AN765, “Using Microchip’s Micropower LDOs”,
DS00765, Microchip Technology Inc., 2002
• AN766, “Pin-Compatible CMOS Upgrades to
BiPolar LDOs”, DS00766,
Microchip Technology Inc., 2002
• AN792, “A Method to Determine How Much
Power a SOT23 Can Dissipate in an Application”,
DS00792, Microchip Technology Inc., 2001
Description
The MCP1801 is a family of CMOS low dropout (LDO)
voltage regulators that can deliver up to 150 mA of
current while consuming only 25 µA of quiescent
current (typical). The input operating range is specified
from 2.0V to 10.0V, making it an ideal choice for two to
six primary cell battery-powered applications, 9V alka-
line and one or two cell Li-Ion-powered applications.
The MCP1801 is capable of delivering 100 mA with
only 200 mV (typical) of input to output voltage differen-
tial (VOUT = 3.3V). The output voltage tolerance of the
MCP1801 at +25°C is typically ±0.4% with a maximum
of ±2%. Line regulation is ±0.01% typical at +25°C.
The LDO output is stable with a minimum of 1 µF of
output capacitance. Ceramic, tantalum or aluminum
electrolytic capacitors can all be used for input and
output. Overcurrent limit with current foldback provides
short-circuit protection. A shutdown (SHDN) function
allows the output to be enabled or disabled. When
disabled, the MCP1801 draws only 0.01 µA of current
(typical).
The MCP1801 is available in a SOT-23-5 package.
Package Types
SOT-23-5
VOUT
NC
54
123
VIN VSS SHDN
© 2007 Microchip Technology Inc.
DS22051A-page 1



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MCP1801
Functional Block Diagram
VIN
MCP1801
SHDN
Shutdown
Control
Voltage
Reference
+VIN
-
+
Current Limiter
Error Amplifier
+VIN
VOUT
GND
Typical Application Circuit
VIN
MCP1801
1 VIN VOUT 5
9V
Battery
+
CIN
1 µF
Ceramic
2 GND
3 SHDN NC 4
VOUT
3.3V @ 40 mA
COUT
1 µF Ceramic
DS22051A-page 2
© 2007 Microchip Technology Inc.



Part Number MCP1801
Description Low Quiescent Current LDO
Maker Microchip Technology - Microchip Technology
Total Page 24 Pages
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