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MCP1702T-3302E/CB

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24P25-P26
MCP1702
DS22008E-page 10 2010 Microchip Technology Inc.
Note: Unless otherwise indicated: V
R
= 2.8V, C
OUT
= 1 µF Ceramic (X7R), C
IN
= 1 µF Ceramic (X7R), I
L
= 100 µA,
T
A
= +25°C, V
IN
= V
OUT(MAX)
+ V
DROPOUT(MAX)
.
FIGURE 2-25: Power Supply Ripple
Rejection vs. Frequency.
FIGURE 2-26: Power Supply Ripple
Rejection vs. Frequency.
FIGURE 2-27: Output Noise vs. Frequency.
FIGURE 2-28: Power Up Timing.
FIGURE 2-29: Dynamic Load Response.
FIGURE 2-30: Dynamic Load Response.
-90
-80
-70
-60
-50
-40
-30
-20
-10
0
0.01 0.1 1 10 100 1000
Frequency (kHz)
PSRR (dB)
V
R
=1.2V
C
OUT
=1.0 μF ceramic X7R
V
IN
=2.7V
C
IN
=0 μF
I
OUT
=1.0 mA
-90
-80
-70
-60
-50
-40
-30
-20
-10
0
0.01 0.1 1 10 100 1000
Frequency (kHz)
PSRR (dB)
V
R
=5.0V
C
OUT
=1.0 μF ceramic X7R
V
IN
=6.0V
C
IN
=0 μF
I
OUT
=1.0 mA
0.001
0.01
0.1
1
10
100
0.01 0.1 1 10 100 1000
Frequency (kHz)
Noise (μV/Hz)
V
R
=5.0V, V
IN
=6.0V
I
OUT
=50 mA
V
R
=2,8V, V
IN
=3.8V
V
R
=1.2V, V
IN
=2.7V
2010 Microchip Technology Inc. DS22008E-page 11
MCP1702
3.0 PIN DESCRIPTIONS
The descriptions of the pins are listed in Table 3-1.
TABLE 3-1: PIN FUNCTION TABLE
3.1 Ground Terminal (GND)
Regulator ground. Tie GND to the negative side of the
output and the negative side of the input capacitor.
Only the LDO bias current (2.0 µA typical) flows out of
this pin; there is no high current. The LDO output
regulation is referenced to this pin. Minimize voltage
drops between this pin and the negative side of the
load.
3.2 Regulated Output Voltage (V
OUT
)
Connect V
OUT
to the positive side of the load and the
positive terminal of the output capacitor. The positive
side of the output capacitor should be physically
located as close to the LDO V
OUT
pin as is practical.
The current flowing out of this pin is equal to the DC
load current.
3.3 Unregulated Input Voltage Pin
(V
IN
)
Connect V
IN
to the input unregulated source voltage.
Like all LDO linear regulators, low source impedance is
necessary for the stable operation of the LDO. The
amount of capacitance required to ensure low source
impedance will depend on the proximity of the input
source capacitors or battery type. For most
applications, 1 µF of capacitance will ensure stable
operation of the LDO circuit. For applications that have
load currents below 100 mA, the input capacitance
requirement can be lowered. The type of capacitor
used can be ceramic, tantalum or aluminum
electrolytic. The low ESR characteristics of the ceramic
will yield better noise and PSRR performance at
high-frequency.
Pin No.
SOT-23A
Pin No.
SOT-89
Pin No.
TO-92
Symbol Function
1 1 1 GND Ground Terminal
233V
OUT
Regulated Voltage Output
32, Tab2 V
IN
Unregulated Supply Voltage
– – – NC No connection
MCP1702
DS22008E-page 12 2010 Microchip Technology Inc.
4.0 DETAILED DESCRIPTION
4.1 Output Regulation
A portion of the LDO output voltage is fed back to the
internal error amplifier and compared with the precision
internal band gap reference. The error amplifier output
will adjust the amount of current that flows through the
P-Channel pass transistor, thus regulating the output
voltage to the desired value. Any changes in input
voltage or output current will cause the error amplifier
to respond and adjust the output voltage to the target
voltage (refer to Figure 4-1).
4.2 Overcurrent
The MCP1702 internal circuitry monitors the amount of
current flowing through the P-Channel pass transistor.
In the event of a short-circuit or excessive output
current, the MCP1702 will turn off the P-Channel
device for a short period, after which the LDO will
attempt to restart. If the excessive current remains, the
cycle will repeat itself.
4.3 Overtemperature
The internal power dissipation within the LDO is a
function of input-to-output voltage differential and load
current. If the power dissipation within the LDO is
excessive, the internal junction temperature will rise
above the typical shutdown threshold of 150°C. At that
point, the LDO will shut down and begin to cool to the
typical turn-on junction temperature of 130°C. If the
power dissipation is low enough, the device will
continue to cool and operate normally. If the power
dissipation remains high, the thermal shutdown
protection circuitry will again turn off the LDO,
protecting it from catastrophic failure.
FIGURE 4-1: Block Diagram.
+
-
MCP1702
V
IN
V
OUT
GND
+V
IN
Error Amplifier
Voltage
Reference
Overcurrent
Overtemperature
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24P25-P26

MCP1702T-3302E/CB

Mfr. #:
Buy MCP1702T-3302E/CB
Manufacturer:
Microchip Technology
Description:
LDO Voltage Regulators LDO w/ Low Quiescent
Lifecycle:
New from this manufacturer.
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