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PDF MCP1825S Data sheet ( Hoja de datos )
| Número de pieza | MCP1825S | |
| Descripción | Low Quiescent Current LDO Regulator | |
| Fabricantes | Microchip Technology | |
| Logotipo |  |
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MCP1825/MCP1825S
500 mA, Low Voltage, Low Quiescent Current LDO Regulator
Features
• 500 mA Output Current Capability
• Input Operating Voltage Range: 2.1V to 6.0V
• Adjustable Output Voltage Range: 0.8V to 5.0V
(MCP1825 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: 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 (typical)
• Low Shutdown Supply Current: 0.1 µA (typical)
(MCP1825 only)
• Fixed Delay on Power Good Output
(MCP1825 only)
• Short Circuit Current Limiting and
Overtemperature Protection
• TO-263-5 (DDPAK-5), TO-220-5, SOT-223-5
Package Options (MCP1825).
• TO-263-3 (DDPAK-3), TO-220-3, SOT-223-3
Package Options (MCP1825S).
Applications
• High-Speed Driver Chipset Power
• Networking Backplane Cards
• Notebook Computers
• Network Interface Cards
• Palmtop Computers
• 2.5V to 1.XV Regulators
Description
The MCP1825/MCP1825S is a 500 mA Low Dropout
(LDO) linear regulator that provides high current and
low output voltages. The MCP1825 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 MCP1825 a good choice for new
sub-1.8V output voltage LDO applications that have
high current demands. The MCP1825S is a 3-pin fixed
voltage version.
The MCP1825/MCP1825S 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 MCP1825/MCP1825S 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 MCP1825
versions have a Shutdown (SHDN) pin. When shut
down, the quiescent current is reduced to less than
0.1 µA.
On the MCP1825 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 110 µs (typical).
The overtemperature and short circuit current-limiting
provide additional protection for the LDO during system
fault conditions.
© 2008 Microchip Technology Inc.
DS22056B-page 1
1 page  
MCP1825/MCP1825S
www.DataSheet4U.com
Functional Block Diagram - Fixed Output (3-Pin)
PMOS
VIN VOUT
Undervoltage
Lock Out
(UVLO)
SHDN
Overtemperature
Sensing
GND
VIN
SHDN
Soft-Start
ISNS
Cf Rf
Driver w/limit
and SHDN
SHDN
VREF
+
EA
–
Sense
Reference
Comp
TDELAY
92% of VREF
© 2008 Microchip Technology Inc.
DS22056B-page 5
5 Page 
MCP1825/MCP1825S
www.DataSheet4U.com
2.0 TYPICAL PERFORMANCE CURVES
Note:
The graphs and tables provided following this note are a statistical summary based on a limited number of
samples and are provided for informational purposes only. The performance characteristics listed herein
are not tested or guaranteed. In some graphs or tables, the data presented may be outside the specified
operating range (e.g., outside specified power supply range) and therefore outside the warranted range.
Note: Unless otherwise indicated, COUT = 4.7 µF Ceramic (X7R), CIN = 4.7 µF Ceramic (X7R), IOUT = 1 mA,
Temperature = +25°C, VIN = VOUT + 0.5V, Fixed output.
140
130
120
110
100
90
2
VOUT = 1.2V Adj
IOUT = 0 mA
130°C
90°C
25°C
0°C
-45°C
345
Input Voltage (V)
6
FIGURE 2-1:
Quiescent Current vs. Input
Voltage (Adjustable Version).
0.10
0.09
0.08
0.07
0.06
0.05
0.04
0.03
0.02
0.01
0.00
-45
IOUT = 1 mA
VOUT = 1.2V adj
VIN = 2.1V to 6.0V
IOUT = 50 mA
IOUT=100 mA IOUT=500 mA
IOUT=250 mA
-20 5 30 55 80 105 130
Temperature (°C)
FIGURE 2-4:
Line Regulation vs.
Temperature (Adjustable Version).
200
190
180
170
160
150
140
130
120
110
100
0
VIN=5.0V
VIN=3.3V
VOUT = 1.2V Adj
VIN=2.5V
100 200 300 400 500 600
Load Current (mA)
FIGURE 2-2:
Ground Current vs. Load
Current (Adjustable Version).
0.20
0.15
0.10
IOUT = 1.0 mA to 500 mA
VOUT = 3.3V
0.05
0.00
-0.05
-0.10
VOUT = 5.0V
VOUT = 1.8V
VOUT = 0.8V
-0.15
-45 -20 5 30 55 80 105 130
Temperature (°C)
FIGURE 2-5:
Load Regulation vs.
Temperature (Adjustable Version).
170
160
150
140
130 VIN=5.0V
120
110
100
90
-45
-20
VOUT = 1.2V Adj
IOUT = 0 mA
VIN=6.0V
VIN=2.1V VIN=3.0V
VIN=4.0V
5 30 55 80
Temperature (°C)
105
130
FIGURE 2-3:
Quiescent Current vs.
Junction Temperature (Adjustable Version).
0.4110
0.4105
0.4100
0.4095
VIN = 6.0V
0.4090
0.4085 VIN = 4.0V
0.4080
0.4075
0.4070
-45
VIN = 2.3V
-20 5 30
55
VOUT = 1.8V
IOUT = 1.0 mA
80 105 130
Temperature (°C)
FIGURE 2-6:
Adjust Pin Voltage vs.
Temperature (Adjustable Version).
© 2008 Microchip Technology Inc.
DS22056B-page 11
11 Page | ||
| Páginas | Total 38 Páginas | |
| PDF Descargar | [ Datasheet MCP1825S.PDF ] | |
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