MCP1727-1802E/SN Microchip Technology, MCP1727-1802E/SN Datasheet - Page 18

• 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
Once the power good threshold (rising) has been
reached, the C
to V
PWRGD output will transition high when the C
voltage has charged to 0.42V. If the output falls below
the power good threshold limit during the charging time
between 0.0V and 0.42V on the C
C
ting the timer. The C
output voltage of the LDO has once again risen above
the power good rising threshold. A timing diagram
showing C
Figure
FIGURE 4-4:
Diagram.
4.7
The SHDN input is an active-low input signal that turns
the LDO on and off. The SHDN threshold is a
percentage of the input voltage. The typical value of
this shutdown threshold is 30% of V
and maximum limits over the entire operating
temperature range of 45% and 15%, respectively.
The SHDN input will ignore low-going pulses (pulses
meant to shut down the LDO) that are up to 400 ns in
pulse width. If the shutdown input is pulled low for more
than 400 ns, the LDO will enter Shutdown mode. This
small bit of filtering helps to reject any system noise
spikes on the shutdown input signal.
On the rising edge of the SHDN input, the shutdown
circuitry has a 30 µs delay before allowing the LDO
output to turn on. This delay helps to reject any false
turn-on signals or noise on the SHDN input signal. After
the 30 µs delay, the LDO output enters its soft-start
period as it rises from 0V to its final regulation value. If
the SHDN input signal is pulled low during the 30 µs
delay period, the timer will be reset and the delay time
will start over again on the next rising edge of the
SHDN input. The total time from the SHDN input going
DS21999B-page 18
DELAY
V
0V
PWRGD
OUT
IN
. The charging current is 140 nA (typical). The
4-4.
pin voltage will be pulled to ground, thus reset-
T
PG
Shutdown Input (SHDN)
DELAY
C
DELAY
DELAY
, PWRGD and V
C
V
DELAY
PWRGD_TH
DELAY
pin charges the external capacitor
C
Threshold (0.42V)
DELAY
pin will be held low until the
V
IN
(typ)
and PWRGD Timing
OUT
IN
DELAY
, with minimum
is shown in
DELAY
pin, the
pin
high (turn-on) to the LDO output being in regulation is
typically 100 µs. See
the SHDN input.
FIGURE 4-5:
Diagram.
4.8
Dropout voltage is defined as the input-to-output
voltage differential at which the output voltage drops
2% below the nominal value that was measured with a
V
a very low dropout voltage specification of 330 mV
(typical) at 1.5A of output current. See Section 1.0
“Electrical Characteristics” for maximum dropout
voltage specifications.
The MCP1727 LDO operates across an input voltage
range of 2.3V to 6.0V and incorporates input Undervolt-
age Lockout (UVLO) circuitry that keeps the LDO
output voltage off until the input voltage reaches a
minimum of 2.18V (typical) on the rising edge of the
input voltage. As the input voltage falls, the LDO output
will remain on until the input voltage level reaches
2.04V (typical).
Since the MCP1727 LDO undervoltage lockout
activates at 2.04V as the input voltage is falling, the
dropout voltage specification does not apply for output
voltages that are less than 1.9V.
For high-current applications, voltage drops across the
PCB traces must be taken into account. The trace
resistances can cause significant voltage drops
between the input voltage source and the LDO. For
applications with input voltages near 2.3V, these PCB
trace voltage drops can sometimes lower the input
voltage enough to trigger a shutdown due to
undervoltage lockout.
R
V
SHDN
+ 0.6V differential applied. The MCP1727 LDO has
OUT
30 µs
Dropout Voltage and Undervoltage
Lockout
T
OR
70 µs
Figure 4-5
Shutdown Input Timing
© 2007 Microchip Technology Inc.
for a timing diagram of
400 ns (typ)