GM6251-3.5 Просмотр технического описания (PDF) - Gamma Microelectronics Inc.

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GM6251-3.5

300mA ULTRA LOW DROPOUT POSITIVE VOLTAGE REGULATOR

Gamma Microelectronics Inc. 

GM6251

300mA ULTRA LOW DROPOUT

POSITIVE VOLTAGE REGULATOR

Application Note

Notes on Usage

1. It is recommended to operate the GM6251 series within the stipulated absolute maximum ratings

as the IC is liable to malfunction it is operated outside the ratings.

2. There is a possibility of heat or oscillation as a result of the impedance present between the

power supply and the IC's input. Where impedance is greater 10Ω, it is recommend to use a

capacitor (CIN) of at least 1µF at the input terminal.

3. With a large output current, operations can be stabilized by increasing capacitor size (CIN). If CIN

is too small and capacitance of (CL) is increased, there is a possibility of oscillation due to input

impedance. In such case, operation can be stabilized by either increasing the size of CIN or

decreasing the size of CL.

4. Please ensure the output current (IOUT) is less than Pd ÷ (VIN - VOUT) and does not exceed the

stipulated continuous for total power dissipation value (Pd) for the package.

CALCULATING POWER DISSIPATION

The GM6251 series precision linear regulators include thermal shutdown and current limit circuitry to

protect the devices. However, high power regulators normally operate at high junction temperatures so

it is important to calculate the power dissipation and junction temperatures accurately to be sure that

you use and adequate heat sink.

The thermal characteristics of an IC depend four factors:

1. Maximum Ambient Temperature TA (℃)

2. Power Dissipation PD (Watts)

3. Maximum Junction Temperature TJ (℃)

4. Thermal Resistance Junction to ambient RJA (℃/W)

These relationship of these four factors is expressed by equation : TJ = TA + PD X RJA

Maximum ambient temperature and power dissipation are determined by the design while the

maximum junction temperature and thermal resistance depend on the manufacturer and the package

type.

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