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  Microchip Technology Semiconductor Electronic Components Datasheet  


MCP1727

Low Quiescent Current LDO Regulator



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MCP1727 pdf
MCP1727
1.5A, Low Voltage, Low Quiescent Current LDO Regulator
Features
• 1.5A 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.cenroRmFiexqeudeOstutput Voltage Options Available
• Low Dropout Voltage: 330 mV Typical at 1.5A
• 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
• 3x3 DFN-8 and SOIC-8 Package Options
Applications
• High-Speed Driver Chipset Power
• Networking Backplane Cards
• Notebook Computers
• Network Interface Cards
• Palmtop Computers
• 2.5V to 1.XV Regulators
Description
The MCP1727 is a 1.5A Low Dropout (LDO) linear
regulator that provides high current and low output
voltages in a very small package. The MCP1727
comes in a fixed (or adjustable) output voltage version,
with an output voltage range of 0.8V to 5.0V. The 1.5A
output current capability, combined with the low output
voltage capability, make the MCP1727 a good choice
for new sub-1.8V output voltage LDO applications that
have high current demands.
The MCP1727 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 MCP1727 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 (3x3 DFN)
Fixed (3x3 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
© 2007 Microchip Technology Inc.
DS21999B-page 1



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MCP1727 pdf
MCP1727
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
MCP1727 Fixed Output Voltage
1 VIN
VOUT 8
2 VIN
Sense 7
3 SHDN CDELAY 6
4 GND PWRGD 5
VOUT = 1.8V @ 1A
R1
C3 100 kΩ
1000 pF
C2
1 µF
PWRGD
MCP1727 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 @ 1A
R1
40 kΩ
C2
1 µF
R3
100 kΩ
R2
20 kΩ
PWRGD
DS21999B-page 2
© 2007 Microchip Technology Inc.



Part Number MCP1727
Description Low Quiescent Current LDO Regulator
Maker Microchip Technology - Microchip Technology
Total Page 30 Pages
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