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)
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.
Applications:
•
•
•
•
•
•
High-Speed Driver Chipset Power
Networking Backplane Cards
Notebook Computers
Network Interface Cards
Palmtop Computers
2.5V to 1.XV Regulators
Package Types
5-LD DDPAK
5-LD TO-220
3-LD DDPAK
3-LD TO-220
Fixed/Adjustable
MCP1827
MCP1827
1 2 3 4 5
SHDN
V
IN
GND(TAB)
V
OUT
PWRGD
MCP1827S
1
V
IN
2
GND(TAB)
3
V
OUT
MCP1827S
1 2 3 4 5
SHDN
V
IN
GND(TAB)
V
OUT
ADJ
1
V
IN
2
GND(TAB)
3
V
OUT
2006-2013 Microchip Technology Inc.
DS22001D-page 1
MCP1827/MCP1827S
Typical Application
MCP1827 Fixed Output Voltage
PWRGD
On
Off
V
IN
= 2.3V to 2.8V
C
1
4.7 µF
SHDN
V
IN
GND
1 2 3 4 5
R
1
100 k
V
OUT
V
OUT
= 1.8V @ 1A
C
2
1 µF
MCP1827 Adjustable Output Voltage
VADJ
R
2
20 k
On
Off
V
IN
= 2.3V to 2.8V
C
1
4.7 µF
SHDN
V
IN
GND
1 2 3 4 5
R
1
40 k
V
OUT
V
OUT
= 1.2V @ 1A
C
2
1 µF
DS22001D-page 2
2006-2013 Microchip Technology Inc.
MCP1827/MCP1827S
Functional Block Diagram – Adjustable Output
PMOS
V
IN
V
OUT
Undervoltage
Lock Out
(UVLO)
I
SNS
C
f
R
f
ADJ
SHDN
Driver w/limit
and SHDN
SHDN
V
REF
V IN
SHDN
Soft-Start
Comp
GND
92% of V
REF
T
DELAY
Reference
+
EA
–
Overtemperature
Sensing
2006-2013 Microchip Technology Inc.
DS22001D-page 3
MCP1827/MCP1827S
Functional Block Diagram – Fixed Output (5-pin)
PMOS
V
IN
V
OUT
Undervoltage
Lock Out
(UVLO)
Sense
I
SNS
C
f
R
f
SHDN
Overtemperature
Sensing
Driver w/limit
and SHDN
SHDN
V
REF
V IN
SHDN
Soft-Start
Comp
GND
92% of V
REF
T
DELAY
Reference
PWRGD
+
EA
–
DS22001D-page 4
2006-2013 Microchip Technology Inc.
MCP1827/MCP1827S
Functional Block Diagram – Fixed Output (3-Pin)
PMOS
V
IN
V
OUT
Undervoltage
Lock Out
(UVLO)
Sense
I
SNS
C
f
R
f
SHDN
Overtemperature
Sensing
Driver w/limit
and SHDN
SHDN
V
REF
V
IN
SHDN
Soft-Start
Comp
GND
92% of V
REF
T
DELAY
Reference
+
EA
–
2006-2013 Microchip Technology Inc.
DS22001D-page 5
