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MCP1791 Datasheet(PDF) 4 Page - Microchip Technology

Part # MCP1791
Description  70 mA, High Voltage Regulator
Download  34 Pages
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Manufacturer  MICROCHIP [Microchip Technology]
Direct Link  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

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MCP1790/MCP1791
DS22075A-page 4
© 2008 Microchip Technology Inc.
1.0
ELECTRICAL
CHARACTERISTICS
Absolute Maximum Ratings †
Input Voltage, VIN .........................................................+48.0V
VIN, PWRGD, SHDN ..................... (GND-0.3V) to (VIN+0.3V)
VOUT .................................................. (GND-0.3V) to (+5.5V)
Internal Power Dissipation ............ Internally-Limited
(Note 4)
Output Short Circuit Current..................................Continuous
Storage temperature .....................................-55°C to +150°C
Maximum Junction Temperature .....................165°C
(Note 7)
Operating Junction Temperature...................-40°C to +125°C
ESD protection on all pins
..........≥ 6 kV HBM and ≥ 400V MM
† Notice: Stresses above those listed under “Maximum Rat-
ings” may cause permanent damage to the device. This is a
stress rating only and functional operation of the device at
those or any other conditions above those indicated in the
operational listings of this specification is not implied. Expo-
sure to maximum rating conditions for extended periods may
affect device reliability.
AC/DC CHARACTERISTICS
Electrical Specifications: Unless otherwise noted, V
IN = VOUT(MAX) + VDROPOUT(MAX), (Note 1), IOUT = 1 mA,
COUT = 4.7 µF (X7R Ceramic), CIN = 4.7 µF (X7R Ceramic), TA = +25°C, SHDN > 2.4V.
Boldface type applies for junction temperatures, T
J (Note 5) of -40°C to +125°C.
Parameters
Symbol
Min
Typ
Max
Units
Conditions
Input Operating Voltage
VIN
6.0
30.0
V
+48VDC Load Dump Peak
< 500 ms
Input Quiescent Current
Iq
—70
130
µA
IL = 0 mA
Input Quiescent Current for SHDN
Mode
ISHDN
—10
25
µA
SHDN = GND
Ground Current
IGND
—110
210
µA
IL = 70 mA
Maximum Output Current
IOUT
70
——
mA
Line Regulation
ΔV
OUT/
(VOUTXΔVIN)
±0.0002
±0.05
%/V
6.0V < VIN < 30V
Load Regulation
ΔV
OUT/VOUT
-0.45
±0.2
0.45
%IOUT = 1 mA to 70 mA
(Note 3)
Output Peak Short Circuit Current
IOUT_SC
—VR/10
A
RLOAD <0.1 Ω,
Peak Current
Output Voltage Regulation
VOUT
VR-2.5%
VR
VR+2.5%
V6.0V < VIN < 30V
VOUT Temperature Coefficient
TCVOUT
65
ppm/°C
Note 9
Input Voltage to Turn On Output
VON
—5.5
6.0
V
Rising VIN
Note 1:
The minimum VIN, VIN(MIN) must meet two conditions: VIN ≥ 6.0V and VIN ≥ VOUT(MAX) + VDROPOUT(MAX).
2:
VR is the nominal regulator output voltage.
3:
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.
4:
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., TA, TJ, θJA). Exceeding the maximum allowable power
dissipation will cause the device operating junction temperature to exceed the maximum 165°C rating. Sustained
junction temperatures above 165°C can impact the device reliability.
5:
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.
6:
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 VIN = VR + VDROPOUT(MAX).
7:
Sustained junction temperatures above 165°C can impact the device reliability.
8:
The Short Circuit Recovery Time test is done by placing the device into a short circuit condition and then removing the
short circuit condition before the device die temperature reaches 125 °C. If the device goes into thermal shutdown, then
the Short Circuit Recovery Time will depend upon the thermal dissipation properties of the package and circuit board.
9:
TCVOUT = (VOUT-HIGH - VOUT-LOW) *10^6 / (VR * ΔTemperature), VOUT-HIGH = highest voltage measured over the tem-
peraturerange. VOUT-LOW = lowest voltage measured over the temperature range.


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