MCP1826.pdf

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MCP1826/MCP1826S
1000 mA, Low Voltage, Low Quiescent Current
LDO Regulator
Features
• 1000 mA Output Current Capability
• Input Operating Voltage Range: 2.3V to 6.0V
• Adjustable Output Voltage Range: 0.8V to 5.0V
(MCP1826 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: 250 mV Typical at 1000 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)
(MCP1826 only)
• Fixed Delay on Power Good Output
(MCP1826 only)
• Short Circuit Current Limiting and
Overtemperature Protection
• TO-263-5 (DDPAK-5), TO-220-5, SOT-223-5
Package Options (MCP1826).
• TO-263-3 (DDPAK-3), TO-220-3, SOT-223-3
Package Options (MCP1826S).
Description
The MCP1826/MCP1826S is a 1000 mA Low Dropout
(LDO) linear regulator that provides high current and
low output voltages. The MCP1826 comes in a fixed or
adjustable output voltage version, with an output
voltage range of 0.8V to 5.0V. The 1000 mA output cur-
rent capability, combined with the low output voltage
capability, make the MCP1826 a good choice for new
sub-1.8V output voltage LDO applications that have
high current demands. The MCP1826S is a 3-pin fixed
voltage version.
The MCP1826/MCP1826S 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 MCP1826/MCP1826S 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 MCP1826
versions have a Shutdown (SHDN) pin. When shut
down, the quiescent current is reduced to less than
0.1 µA.
On the MCP1826 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
©
2007 Microchip Technology Inc.
DS22057A-page 1
MCP1826/MCP1826S
Package Types
MCP1826
DDPAK-5
TO-220-5
Fixed/Adjustable
DDPAK-3
MCP1826S
TO-220-3
1
1 2 3 4 5
1 2 3 4 5
2
3
1
2
3
SOT-223-5
6
SOT-223-3
4
1
2
3
4
5
1
2
3
Pin
1
2
3
4
5
6
Fixed
SHDN
V
IN
GND (TAB)
V
OUT
PWRGD
GND (TAB)
Adjustable
SHDN
V
IN
GND (TAB)
V
OUT
ADJ
GND (TAB)
Pin
1
2
3
4
V
IN
GND (TAB)
V
OUT
GND (TAB)
DS22057A-page 2
©
2007 Microchip Technology Inc.
MCP1826/MCP1826S
Typical Application
MCP1826 Fixed Output Voltage
PWRGD
On
Off
V
IN
= 2.3V to 2.8V
C
1
4.7 µF
SHDN
V
IN
1
GND
V
OUT
R
1
100 kΩ
V
OUT
= 1.8V @ 1000 mA
C
2
1 µF
MCP1826 Adjustable Output Voltage
V
ADJ
R
2
20 kΩ
On
Off
V
IN
= 2.3V to 2.8V
C
1
4.7 µF
GND
SHDN
V
IN
1
V
OUT
R
1
40 kΩ
V
OUT
= 1.2V @ 1000 mA
C
2
1 µF
©
2007 Microchip Technology Inc.
DS22057A-page 3
MCP1826/MCP1826S
Functional Block Diagram - Adjustable Output
PMOS
V
IN
V
OUT
Undervoltage
Lock Out
(UVLO)
I
SNS
C
f
R
f
ADJ/SENSE
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
–
DS22057A-page 4
©
2007 Microchip Technology Inc.
MCP1826/MCP1826S
Functional Block Diagram - Fixed Output (3-Pin)
PMOS
V
IN
V
OUT
Undervoltage
Lock Out
(UVLO)
SHDN
Sense
I
SNS
C
f
R
f
Overtemperature
Sensing
Driver w/limit
and SHDN
SHDN
V
REF
+
EA
–
V IN
SHDN
Soft-Start
Comp
GND
92% of V
REF
T
DELAY
Reference
©
2007 Microchip Technology Inc.
DS22057A-page 5

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