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參數(shù)資料
| 型號： | AAT3242ITP-IQ-T1 |
| 廠商： | Advanced Analog Technology,lnc. |
| 元件分類： | 基準(zhǔn)電壓源/電流源 |
| 英文描述： | 300mA/150mA Dual CMOS LDO Linear Regulator |
| 中文描述： | 300mA/150mA LDO線性穩(wěn)壓器的CMOS雙 |
| 文件頁數(shù)： | 13/16頁 |
| 文件大小： | 274K |
| 代理商： | AAT3242ITP-IQ-T1 |
AAT3242
300mA/150mA Dual CMOS LDO Linear Regulator
3242.2006.04.1.10
13
The following is an example for a 2.5V output:
V
OUTA
V
OUTB
I
OUTB
= 2.5V
= 1.5V
= 150mA
From the discussion above, P
D(MAX)
was determined to equal 909mW at T
A
= 25°C.
Therefore, with Regulator B delivering 150mA at 1.5V, Regulator A can sustain a constant 2.5V output at a
296mA load current at an ambient temperature of 25°C. Higher input-to-output voltage differentials can be
obtained with the AAT3242, while maintaining device functions within the thermal safe operating area. To
accomplish this, the device thermal resistance must be reduced by increasing the heat sink area or by oper-
ating the LDO regulator in a duty-cycled mode.
For example, an application requires V
IN
= 4.2V while V
OUT
= 1.5V at a 500mA load and T
A
= 25°C. To main-
tain this high input voltage and output current level, the LDO regulator must be operated in a duty-cycled mode.
Refer to the following calculation for duty-cycle operation:
I
GND
= 125μA
I
OUT
= 500mA
P
D(MAX)
is assumed to be 909mW
For a 500mA output current and a 2.7V drop across the AAT3242 at an ambient temperature of 25°C, the max-
imum on-time duty cycle for the device would be 48.10%.
%DC =
V
IN
= 4.2V
V
OUT
= 1.5V
%DC = 48.10%
100(P
D(MAX)
)
[(V
IN
- V
OUTA
)I
OUTA
+ (V
IN
×
I
GND
)] + [(V
IN
- V
OUTB
)I
OUTB
+ (V
IN
×
I
GND
)]
%DC =
100(909mW)
[(4.2V - 1.5V)500mA + (4.2V
×
125
μ
A)] + [(4.2V - 1.5V)200mA + (4.2V
×
125
μ
A)]
I
OUTA(MAX)
=
V
IN
= 4.2V
I
GND
= 125
μ
A
I
OUTA(MAX)
= 296mA
909mW - (2
×
4.2V
×
125
μ
A) - (4.2 - 1.5)
×
150mA
4.2 - 2.5
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| AAT3242ITP-OI-T1 | 制造商:ANALOGICTECH 制造商全稱:Advanced Analogic Technologies 功能描述:300mA/150mA Dual CMOS LDO Linear Regulator |
| AAT3242ITP-PP-T1 | 制造商:ANALOGICTECH 制造商全稱:Advanced Analogic Technologies 功能描述:300mA/150mA Dual CMOS LDO Linear Regulator |
| AAT3242ITP-QG-T1 | 制造商:ANALOGICTECH 制造商全稱:Advanced Analogic Technologies 功能描述:300mA/150mA Dual CMOS LDO Linear Regulator |
| AAT3242ITP-QN-T1 | 制造商:ANALOGICTECH 制造商全稱:Advanced Analogic Technologies 功能描述:300mA/150mA Dual CMOS LDO Linear Regulator |
| AAT3242ITP-QO-T1 | 制造商:ANALOGICTECH 制造商全稱:Advanced Analogic Technologies 功能描述:300mA/150mA Dual CMOS LDO Linear Regulator |
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