MCP1727-1802E/SN Microchip Technology, MCP1727-1802E/SN Datasheet - Page 16

• Manufacturer Part Number: MCP1727-1802E/SN
• Description: IC REG LDO 1.5A 1.8V 8SOIC
• Manufacturer: Microchip Technology

Specifications of MCP1727-1802E/SN

• Regulator Topology: Positive Fixed
• Voltage - Output: 1.8V
• Voltage - Input: 2.3 ~ 6 V
• Voltage - Dropout (typical): 0.33V @ 1.5A
• Number Of Regulators: 1
• Current - Output: 1.5A (Min)
• Operating Temperature: -40°C ~ 125°C
• Mounting Type: Surface Mount
• Package / Case: 8-SOIC (3.9mm Width)
• Primary Input Voltage: 2.3V
• Output Voltage Fixed: 1.8V
• Dropout Voltage Vdo: 330mV
• No. Of Pins: 8
• Output Current: 1.5A
• Operating Temperature Range: -40°C To +125°C
• Number Of Outputs: 1
• Polarity: Positive
• Input Voltage Max: 6 V
• Output Voltage: 1.8 V
• Output Type: Fixed
• Dropout Voltage (max): 0.55 V at 1.5 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

MCP1727
4.0
The MCP1727 is a high output current, Low Dropout
(LDO) voltage regulator with an adjustable delay
power-good output and shutdown control input. The
low dropout voltage of 330 mV typical at 1.5A of current
makes it ideal for battery-powered applications. Unlike
other high output current LDOs, the MCP1727 only
draws a maximum of 220 µA of quiescent current.
4.1
The MCP1727 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.
4.1.1
The adjustable version of the MCP1727 uses the ADJ
pin (pin 7) 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
MCP1727. 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:
DS21999B-page 16
Off
Where:
V
IN
On
V
V
OUT
ADJ
4.7 µF
C
DEVICE OVERVIEW
LDO Output Voltage
1
ADJUST INPUT
shows the adjustable version of the
=
=
V
1
2
3
4
MCP1727-ADJ
OUT
V
V
SHDN
GND
LDO Output Voltage
ADJ Pin Voltage
(typically 0.41V)
IN
IN
=
Typical adjustable output
PWRGD
C
V
1
DELAY
V
ADJ
1000 pF
ADJ
OUT
and R
⎛
⎝
8
7
6
5
R
------------------
C
3
1
R
+
2
2
R
form the resistor
2
⎞
⎠
R
R
V
2
1
OUT
OUT
1 µF
C2
2
is:
is
1
EQUATION 4-2:
4.2
The MCP1727 LDO is tested and ensured to supply a
minimum of 1.5A of output current. The MCP1727 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 MCP1727 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 MCP1727 will
supply higher load currents of up to 3A. The MCP1727
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 1.5A 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 4.9 “Overtem-
perature Protection” for more information on
overtemperature shutdown.
4.3
The MCP1727 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
MCP1727 to improve dynamic performance and power
supply ripple rejection performance. A maximum of
22 µF
capacitors are not recommended for low-temperature
applications of ≤ 25°C.
Where:
V
V
OUT
ADJ
Output Current and Current
Limiting
Output Capacitor
is
=
=
recommended.
R
1
=
LDO Output Voltage
ADJ Pin Voltage
(typically 0.41V)
R
2
© 2007 Microchip Technology Inc.
⎛
⎝
V
--------------------------------
OUT
V
ADJ
–
V
Aluminum-electrolytic
ADJ
⎞
⎠