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TC1189-XECT Datasheet(PDF) 8 Page - Microchip Technology

No. de pieza TC1189-XECT
Descripción Electrónicos  MAX8863/64 Pin Compatible, Low Dropout, 120 mA Linear Regulators
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Fabricante Electrónico  MICROCHIP [Microchip Technology]
Página de inicio  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

TC1189-XECT Datasheet(HTML) 8 Page - Microchip Technology

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TC1188/TC1189
DS21364C-page 8
 2002-2012 Microchip Technology Inc.
EXAMPLE 3-1:
The previously defined power dissipation equations
can be used to ensure that the regulator thermal
operation is within limits.
Given:
VIN(MAX) = 3.0V +10%
VOUT(MAX) = 2.7V - 2.5%
ILOAD(MAX) = 40 MA
TJ(MAX) = 125°C
TA(MAX) = 55°C
Find:
1.
Actual power dissipation.
2.
Maximum allowable dissipation.
Actual power dissipation:
Maximum allowable power dissipation:
In this example, the TC1188/TC1189 dissipates a max-
imum of 26.7 mW below the allowable limit of 318 mW.
In a similar manner, the power dissipation equation, as
a function of VIN, VOUT and ILOAD, along with the power
dissipation equation, as a function of maximum junction
temperature, maximum ambient temperature and junc-
tion to air thermal resistance, can be used to calculate
maximum current and/or maximum input voltage limits.
4.0
APPLICATIONS INFORMATION
4.1
Input Capacitor
A 1 µF (or larger) capacitor is recommended to bypass
the LDO input and lower input impedance for circuit
stability when operating from batteries or high imped-
ance sources. The input capacitor can be ceramic, tan-
talum or aluminum electrolytic. For applications that
require low noise and input power supply rejection, low
effective series resistance (ESR) ceramic capacitors
are recommended over higher ESR electrolytic capac-
itors. Larger value input capacitors can be used to
improve circuit performance.
4.2
Output Capacitor
A 1 µF (minimum) capacitor is required from V
OUT to
ground to ensure circuit stability. The output capacitor
should have an ESR greater than 0.1 ohms and less
than 2 ohm. Tantalum or aluminum electrolytic capaci-
tors are recommended. Since many aluminum electro-
lytic capacitors freeze at approximately -30°C, solid
tantalums are recommended for applications operating
below 25°C.
PD = VIN(MAX) - VOUT(MIN) x ILOAD(MAX)
PD = ((3.0 * 1.1) - (2.7 * 0.975)) * 40 mA
PD = 26.7 mWatts
PD = (TJ(MAX) - TA(MAX))/JA
PD(MAX) = (125 - 55) / 220
PD(MAX) = 318 mWatts.


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