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MCP1824/MCP1824S
AC/DC CHARACTERISTICS (CONTINUED)
Electrical Specifications: Unless otherwise noted, V IN = V OUT(MAX) + V DROPOUT(MAX) , Note 1 , V R = 1.8V for Adjustable Output,
I OUT = 1 mA, C IN = C OUT = 4.7 μF (X7R Ceramic), T A = +25°C.
Boldface type applies for junction temperatures, T J ( Note 7 ) of -40°C to +125°C
Parameters
Detect Threshold to PWRGD
Sym
T VDET-PWRGD
Min
—
Typ
200
Max
—
Units
μs
Conditions
V OUT = V PWRGD_TH + 50 mV
Active Time Delay
Shutdown Input
to V PWRGD_TH - 50 mV
Logic High Input
Logic Low Input
SHDN Input Leakage Current
V SHDN-HIGH
V SHDN-LOW
SHDN ILK
45
—
-0.1
—
—
±0.001
—
15
+0.1
%V IN
%V IN
μA
V IN = 2.1V to 6.0V
V IN = 2.1V to 6.0V
V IN = 6V, SHDN =V IN ,
SHDN = GND
AC Performance
Output Delay From SHDN
T OR
—
100
—
μs
SHDN = GND to V IN ,
V OUT = GND to 95% V R
Output Noise
e N
—
2.0
—
μV/ √ Hz
I OUT = 200 mA, f = 1 kHz,
C OUT = 10 μF (X7R Ceramic),
V OUT = 2.5V
Power Supply Ripple Rejection
PSRR
—
55
—
dB
f = 100 Hz,
Ratio
I OUT = 10 mA,
V INAC = 200 mV pk-pk,
C IN = 0 μF
Thermal Shutdown Temperature
T SD
—
150
—
°C
I OUT = 100 μA, V OUT = 1.8V,
V IN = 2.8V
Thermal Shutdown Hysteresis
Δ T SD
—
10
—
°C
I OUT = 100 μA, V OUT = 1.8V,
V IN = 2.8V
Note 1:
2:
3:
4:
5:
6:
7:
The minimum V IN must meet two conditions: V IN ≥ 2.1V and V IN ≥ V OUT(MAX) + V DROPOUT(MAX).
V R is the nominal regulator output voltage for the fixed cases. V R = 1.2V, 1.8V, etc. V R is the desired set point output
voltage for the adjustable cases. V R = V ADJ * ((R 1 /R 2 )+1). Figure 4-1 .
TCV OUT = (V OUT-HIGH – V OUT-LOW ) *10 6 / (V R * Δ Temperature). V OUT-HIGH is the highest voltage measured over the
temperature range. V OUT-LOW is the lowest voltage measured over the temperature range.
Load regulation is measured at a constant junction temperature using low duty-cycle pulse testing. Load regulation is
tested over a load range from 1 mA to the maximum specified output current.
Dropout voltage is defined as the input-to-output voltage differential at which the output voltage drops 2% below its
nominal value that was measured with an input voltage of V IN = V OUT(MAX) + V DROPOUT(MAX) .
The maximum allowable power dissipation is a function of ambient temperature, the maximum allowable junction
temperature and the thermal resistance from junction to air. (i.e., T A , T J , θ JA ). Exceeding the maximum allowable power
dissipation will cause the device operating junction temperature to exceed the maximum +150°C rating. Sustained
junction temperatures above 150°C can impact device reliability.
The junction temperature is approximated by soaking the device under test at an ambient temperature equal to the
desired junction temperature. The test time is small enough such that the rise in the junction temperature over the
ambient temperature is not significant.
2007 Microchip Technology Inc.
DS22070A-page 9
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