MCP1826S-0802E/EB Microchip Technology, MCP1826S-0802E/EB Datasheet - Page 16

• Manufacturer Part Number: MCP1826S-0802E/EB
• Description: 1A CMOS LDO, Vout=0.8V, Extended Temp Range 3 DDPAK TUBE
• Manufacturer: Microchip Technology

Specifications of MCP1826S-0802E/EB

• Regulator Topology: Positive Fixed
• Voltage - Output: 0.8V
• Voltage - Input: 2.3 ~ 6 V
• Voltage - Dropout (typical): 0.25V @ 1A
• Number Of Regulators: 1
• Current - Output: 1A (Min)
• Operating Temperature: -40°C ~ 125°C
• Mounting Type: Surface Mount
• Package / Case: TO-263-3, D²Pak (3 leads + Tab), TO-263AA
• Number Of Outputs: 1
• Polarity: Positive
• Input Voltage Max: 6 V
• Output Voltage: 0.8 V
• Output Type: Fixed
• Dropout Voltage (max): 0.4 V at 1 A
• Output Current: 1 A
• Line Regulation: 0.05 % / V
• Load Regulation: 0.5 %
• Voltage Regulation Accuracy: 2 %
• Maximum Operating Temperature: + 125 C
• Mounting Style: SMD/SMT
• Minimum Operating Temperature: - 40 C
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Current - Limit (min): -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

MCP1826/MCP1826S
4.0
The MCP1826/MCP1826S is a high output current,
Low Dropout (LDO) voltage regulator. The low dropout
voltage of 300 mV typical at 1000 mA of current makes
it ideal for battery-powered applications. Unlike other
high output current LDOs, the MCP1826/MCP1826S
only draws a maximum of 220 µA of quiescent current.
The MCP1826 has a shutdown control input and a
power good output.
4.1
The 5-pin MCP1826 LDO is available with either a fixed
output voltage or an adjustable output voltage. The
output voltage range is 0.8V to 5.0V for both versions.
The 3-pin MCP1826S LDO is available as a fixed
voltage device.
4.1.1
The adjustable version of the MCP1826 uses the ADJ
pin (pin 5) to get the output voltage feedback for output
voltage regulation. This allows the user to set the
output voltage of the device with two external resistors.
The nominal voltage for ADJ is 0.41V.
Figure 4-1
MCP1826. Resistors R
divider network necessary to set the output voltage.
With this configuration, the equation for setting V
EQUATION 4-1:
FIGURE 4-1:
voltage application circuit.
The allowable resistance value range for resistor R
from 10 kΩ to 200 kΩ. Solving the equation for R
yields the following equation:
DS22057A-page 16
Off
Where:
On
V
V
OUT
ADJ
DEVICE OVERVIEW
LDO Output Voltage
SHDN
V
IN
ADJUST INPUT
shows the adjustable version of the
4.7 µF
C
1
=
=
V
MCP1826-ADJ
OUT
1
LDO Output Voltage
ADJ Pin Voltage
(typically 0.41V)
2
=
Typical adjustable output
3 4 5
GND
V
1
ADJ
and R
⎛
⎝
ADJ
R
------------------
1
R
+
2
2
R
form the resistor
2
⎞
⎠
R
R
V
1
2
OUT
OUT
C2
1 µF
2
is:
is
1
EQUATION 4-2:
4.2
The MCP1826/MCP1826S LDO is tested and ensured
to supply a minimum of 1000 mA of output current. The
MCP1826/MCP1826S has no minimum output load, so
the output load current can go to 0 mA and the LDO will
continue to regulate the output voltage to within
tolerance.
The MCP1826/MCP1826S also incorporates an output
current limit. If the output voltage falls below 0.7V due
to an overload condition (usually represents a shorted
load condition), the output current is limited to 2.2A
(typical). If the overload condition is a soft overload, the
MCP1826/MCP1826S will supply higher load currents
of up to 2.5A. The MCP1826/MCP1826S should not be
operated in this condition continuously as it may result
in failure of the device. However, this does allow for
device usage in applications that have higher pulsed
load currents having an average output current value of
1000 mA or less.
Output overload conditions may also result in an over-
temperature shutdown of the device. If the junction
temperature rises above 150°C, the LDO will shut
down the output voltage. See Section 4.8 “Overtem-
perature Protection” for more information on
overtemperature shutdown.
4.3
The MCP1826/MCP1826S requires a minimum output
capacitance of 1 µF for output voltage stability. Ceramic
capacitors are recommended because of their size,
cost and environmental robustness qualities.
Aluminum-electrolytic and tantalum capacitors can be
used on the LDO output as well. The Equivalent Series
Resistance (ESR) of the electrolytic output capacitor
must be no greater than 1 ohm. The output capacitor
should be located as close to the LDO output as is
practical. Ceramic materials X7R and X5R have low
temperature coefficients and are well within the
acceptable ESR range required. A typical 1 µF X7R
0805 capacitor has an ESR of 50 milli-ohms.
Larger LDO output capacitors can be used with the
MCP1826/MCP1826S
performance and power supply ripple rejection
performance. A maximum of 22 µF is recommended.
Aluminum-electrolytic capacitors are not recom-
mended for low-temperature applications of ≤ 25°C.
Where:
V
V
OUT
ADJ
Output Current and Current
Limiting
Output Capacitor
=
=
R
1
=
LDO Output Voltage
ADJ Pin Voltage
(typically 0.41V)
R
2
© 2007 Microchip Technology Inc.
⎛
⎝
V
--------------------------------
OUT
to
V
ADJ
–
V
improve
ADJ
⎞
⎠
dynamic