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  Microchip Technology Semiconductor Electronic Components Datasheet  


MCP1725

Low Quiescent Current LDO Regulator



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MCP1725 pdf
MCP1725
500 mA, Low Voltage, Low Quiescent Current LDO Regulator
Features
• 500 mA Output Current Capability
• Input Operating Voltage Range: 2.3V to 6.0V
• Adjustable Output Voltage Range: 0.8V to 5.0V
• Standard Fixed Output Voltages:
- 0.8V, 1.2V, 1.8V, 2.5V, 3.0V, 3.3V, 5.0V
www.DataSheetOU4pUtho.ecnroRmFiexqeudeOstutput Voltage Options Available
• Low Dropout Voltage: 210 mV Typical at 500 mA
• Typical Output Voltage Tolerance: 0.5%
• Stable with 1.0 µF Ceramic Output Capacitor
• Fast response to Load Transients
• Low Supply Current: 120 µA (typ)
• Low Shutdown Supply Current: 0.1 µA (typ)
• Adjustable Delay on Power Good Output
• Short Circuit Current Limiting and
Overtemperature Protection
• 2x3 DFN-8 and SOIC-8 Package Options
Applications
• High-Speed Driver Chipset Power
• Networking Backplane Cards
• Notebook Computers
• Network Interface Cards
• Palmtop Computers
• Video Graphics Adapters
• 2.5V to 1.XV Regulators
Description
The MCP1725 is a 500 mA Low Dropout (LDO) linear
regulator that provides high current and low output
voltages in a very small package. The MCP1725
comes in a fixed (or adjustable) output voltage version,
with an output voltage range of 0.8V to 5.0V. The
500 mA output current capability, combined with the
low output voltage capability, make the MCP1725 a
good choice for new sub-1.8V output voltage LDO
applications that have high current demands.
The MCP1725 is stable using ceramic output
capacitors that inherently provide lower output noise
and reduce the size and cost of the entire regulator
solution. Only 1 µF of output capacitance is needed to
stabilize the LDO.
Using CMOS construction, the quiescent current
consumed by the MCP1725 is typically less than
120 µA over the entire input voltage range, making it
attractive for portable computing applications that
demand high output current. When shut down, the
quiescent current is reduced to less than 0.1 µA.
The scaled-down output voltage is internally monitored
and a power good (PWRGD) output is provided when
the output is within 92% of regulation (typical). An
external capacitor can be used on the CDELAY pin to
adjust the delay from 200 µs to 300 ms.
The overtemperature and short circuit current-limiting
provide additional protection for the LDO during system
fault conditions.
Package Types
Adjustable (SOIC-8)
Fixed (SOIC-8)
Adjustable (2x3 DFN)
Fixed (2x3 DFN)
VIN 1
VIN 2
SHDN 3
GND 4
8 VOUT
7 ADJ
6 CDELAY
5 PWRGD
VIN 1
VIN 2
SHDN 3
GND 4
8 VOUT
7 Sense
6 CDELAY
5 PWRGD
VIN
VIN
SHDN
GND
1
2
3
4
8 VOUT
VIN 1
7 ADJ
VIN 2
6 CDELAY SHDN 3
5 PWRGD GND 4
8 VOUT
7 Sense
6 CDELAY
5 PWRGD
Note: DFN tab is at ground potential.
© 2006 Microchip Technology Inc.
DS22026A-page 1



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MCP1725 pdf
MCP1725
Typical Application
VIN = 2.3V to 2.8V
C1
4.7 µF
On
Off
www.DataSheet4U.com
VIN = 2.3V to 2.8V
C1
4.7 µF
On
Off
MCP1725 Fixed Output Voltage
1 VIN
VOUT 8
2 VIN
Sense 7
3 SHDN CDELAY 6
4 GND PWRGD 5
VOUT = 1.8V @ 500 mA
R1
C3 100 kΩ
1000 pF
C2
1 µF
PWRGD
MCP1725 Adjustable Output Voltage
1 VIN
VOUT 8
2 VIN
ADJ 7
3 SHDN CDELAY 6
4 GND PWRGD 5
C3
1000 pF
VOUT = 1.2V @ 500 mA
R1
40 kΩ
C2
1 µF
R3
100 kΩ
R2
20 kΩ
PWRGD
DS22026A-page 2
© 2006 Microchip Technology Inc.



Part Number MCP1725
Description Low Quiescent Current LDO Regulator
Maker Microchip Technology - Microchip Technology
Total Page 32 Pages
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