- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄375162 > AAT1141 (Advanced Analogic Technologies, Inc.) Fast Transient 600mA Step-Down Converter PDF資料下載
參數(shù)資料
| 型號： | AAT1141 |
| 廠商： | Advanced Analogic Technologies, Inc. |
| 英文描述： | Fast Transient 600mA Step-Down Converter |
| 中文描述： | 快速的瞬時600mA降壓轉(zhuǎn)換器 |
| 文件頁數(shù)： | 14/19頁 |
| 文件大?。?/td> | 951K |
| 代理商： | AAT1141 |
AAT1141
Fast Transient 600mA Step-Down Converter
SwitchReg
TM
PRODUCT DATASHEET
14
1141.2007.12.1.3
w w w . a n a l o g i c t e c h . c o m
Thermal Calculations
There are three types of losses associated with the
AAT1141 step-down converter: switching losses, con-
duction losses, and quiescent current losses. Conduction
losses are associated with the R
DS(ON)
characteristics of
the power output switching devices. Switching losses are
dominated by the gate charge of the power output
switching devices. At full load, assuming continuous con-
duction mode (CCM), a simplified form of the LDO losses
is given by:
P
TOTAL
I
O
2
· (R
DSON(HS)
· V
O
+ R
DSON(LS)
· [V
IN
- V
O
])
V
IN
=
+ (t
sw
· F · I
O
+ I
Q
) · V
IN
I
Q
is the step-down converter quiescent current. The
term t
sw
is used to estimate the full load step-down con-
verter switching losses.
For the condition where the step-down converter is in
dropout at 100% duty cycle, the total device dissipation
reduces to:
P
TOTAL
= I
O
2
· R
DSON(HS)
+ I
Q
· V
IN
Since R
DS(ON)
, quiescent current, and switching losses all
vary with input voltage, the total losses should be inves-
tigated over the complete input voltage range.
Given the total losses, the maximum junction tempera-
ture can be derived from the
θ
JA
for the SOT23-5 pack-
age which is 150°C/W.
T
J(MAX)
=
P
TOTAL
·
Θ
JA
+ T
AMB
Output Dropout
At dropout, the duty cycle of AAT1141 switching is
100%. The minimum dropout voltage is determined by
R
DS(ON)H
and the inductor copper loss resistor. AAT1141
has 0.53
Ω
R
DS(ON)H
. The inductor copper loss resistor var-
ies with different inductor values and manufacturer. The
safe dropout voltage is 0.5V for a 600mA load.
For example, when load current is 600mA, the voltage
dropped across R
DS(ON)H
is 0.32V; if the inductor copper
loss resistor is 135m
Ω
, the voltage drop across the
inductor is 0.08V. So the total voltage drop is 0.4V.
Considering manufacturer’s tolerances, the inductor cop-
per loss resistor and R
DS(ON)H
will vary from part to part,
a 0.5V dropout window is safe.
IN
1
LX
5
GND
2
EN
3
OUT
4
U1
AAT1141
1
2
3
C1
4.7μF
L1
4.7μH
SW
V
= 1.8V
OUT
C2
10μF
C3
100pF
R1
442k
R2
221k
V
IN
Enable
Figure 5: AAT1141 Adjustable Evaluation Board Schematic.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| AAT1141IGV-0.6-T1 | Fast Transient 600mA Step-Down Converter |
| AAT1141IGV-1.8-T1 | Fast Transient 600mA Step-Down Converter |
| AAT1143 | Circular Connector; MIL SPEC:MIL-C-5015; Body Material:Metal; Series:GT; No. of Contacts:4; Connector Shell Size:22; Connecting Termination:Solder; Circular Shell Style:Square Flange Receptacle; Body Style:Straight |
| AAT1143IJS-0.6-T1 | Circular Connector; MIL SPEC:MIL-C-5015; Body Material:Metal; Series:GT; No. of Contacts:5; Connector Shell Size:24; Connecting Termination:Solder; Circular Shell Style:Square Flange Receptacle; Body Style:Straight |
| AAT1143IJS-1.2-T1 | GT 24C 24#16 SKT RECP |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| AAT1141_08 | 制造商:ANALOGICTECH 制造商全稱:Advanced Analogic Technologies 功能描述:Fast Transient 600mA Step-Down Converter |
| AAT1141_0810 | 制造商:ANALOGICTECH 制造商全稱:Advanced Analogic Technologies 功能描述:Fast Transient 600mA Step-Down Converter |
| AAT1141ICB-0.6-T1 | 制造商:ANALOGICTECH 制造商全稱:Advanced Analogic Technologies 功能描述:Fast Transient 600mA Step-Down Converter |
| AAT1141IGV-0.6-T1 | 制造商:Skyworks Solutions Inc 功能描述:DC TO DC CONVERTER |
| AAT1141IGV-1.0-T1 | 制造商:ANALOGICTECH 制造商全稱:Advanced Analogic Technologies 功能描述:Fast Transient 600mA Step-Down Converter |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。