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  Microchip Technology Semiconductor Electronic Components Datasheet  


MCP1827S

Low Voltage Current LDO Regulator


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MCP1827/MCP1827S
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
(MCP1827 only)
• Standard Fixed Output Voltages:
- 0.8V, 1.2V, 1.8V, 2.5V, 3.0V, 3.3V, 5.0V
• Other Fixed Output Voltage Options Available
Upon Request
• 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)
(MCP1827 only)
• Fixed Delay on Power Good Output
(MCP1827 only)
• Short Circuit Current Limiting and
Overtemperature Protection
• 5-Lead Plastic DDPAK, 5-Lead TO-220 Package
Options (MCP1827)
• 3-Lead Plastic DDPAK, 3-Lead TO-220 Package
Options (MCP1827S)
Applications
• High-Speed Driver Chipset Power
• Networking Backplane Cards
• Notebook Computers
• Network Interface Cards
• Palmtop Computers
• 2.5V to 1.XV Regulators
Description
The MCP1827/MCP1827S is a 1.5A Low Dropout
(LDO) linear regulator that provides high current and
low output voltages. The MCP1827 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 MCP1827 a good choice for new
sub-1.8V output voltage LDO applications that have
high current demands. The MCP1827S is a 3-pin fixed
voltage version. The MCP1827/MCP1827S is based
upon the MCP1727 LDO device.
The MCP1827/MCP1827S 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 MCP1827/MCP1827S is typically
less than 120 µA over the entire input voltage range,
making it attractive for portable computing applications
that demand high output current. The MCP1827
versions have a Shutdown (SHDN) pin. When shut
down, the quiescent current is reduced to less than
0.1 µA.
On the MCP1827 fixed output versions 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). The
PWRGD delay is internally fixed at 200 µs (typical).
The overtemperature and short circuit current-limiting
provide additional protection for the LDO during system
fault conditions.
Package Types
5-LD DDPAK 5-LD TO-220
Fixed/Adjustable
3-LD DDPAK 3-LD TO-220
MCP1827
12345
MCP1827
12345
MCP1827S
123
MCP1827S
123
© 2006 Microchip Technology Inc.
DS22001B-page 1



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MCP1827/MCP1827S
Typical Application
MCP1827 Fixed Output Voltage
On
Off
VIN = 2.3V to 2.8V
C1
4.7 µF
SHDN
VIN
12345
GND
R1
100 kΩ
VOUT
PWRGD
VOUT = 1.8V @ 1A
C2
1 µF
MCP1827 Adjustable Output Voltage
VADJ
On
Off
VIN = 2.3V to 2.8V
C1
4.7 µF
SHDN
VIN
12345
GND
VOUT
R1
40 kΩ
R2
20 kΩ
VOUT = 1.2V @ 1A
C2
1 µF
DS22001B-page 2
© 2006 Microchip Technology Inc.



Part Number MCP1827S
Description Low Voltage Current LDO Regulator
Maker Microchip Technology - Microchip Technology
Total Page 30 Pages
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