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參數(shù)資料
| 型號(hào)： | MAX1889EGE |
| 廠商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | Triple-Output TFT LCD Power Supply with Fault Protection |
| 中文描述： | 2.8 A SWITCHING REGULATOR, 1250 kHz SWITCHING FREQ-MAX, QCC16 |
| 封裝： | 5 X 5 MM, 0.90 MM HEIGHT, THIN, QFN-16 |
| 文件頁數(shù)： | 20/32頁 |
| 文件大?。?/td> | 796K |
| 代理商： | MAX1889EGE |
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M
Triple-Output TFT LCD Power Supply
with Fault Protection
20
______________________________________________________________________________________
If the junction temperature is +100
°
C, the maximum on-
state resistance overtemperature is:
For given R1 and R2 values, the ideal ratio of R3/R4
can be determined:
To consider the effect of resistor tolerance, comparator
offset, and input voltage variation, the minimum threshold
equation is:
where V
IN(MIN)
is the minimum expected value of the
input voltage,
ε
is the tolerance of the resistors and the
5mV is the worst-case input offset voltage of the com-
parator. To simplify the equation, define a constant k as
follows:
The minimum threshold equation becomes:
Solving for R3/R4 yields:
The R3/R4 ratio guarantees the required minimum level
for I
L(MAX)
. The typical overcurrent threshold is given by:
The following example shows how to apply the above
equations in the design. If 1% resistors are used, then
ε
= 0.01. To set V
OCP
to be around 75% of V
IN
, select
R1 = 51.1k
and R2 = 150k
. Assume that the mini-
mum input voltage is 2.7V and the typical input voltage
is 3.3V, the average inductor current at maximum load
is 1.25A, and the maximum R
DS(ON)
of P1 is 100m
:
If R4 =150k
, then R3 = 39.2k
. The typical overcurrent
threshold is:
Charge Pumps
Selecting the Number of
Charge-Pump Stages
For highest efficiency, always choose the lowest num-
ber of charge-pump stages that meets the output
requirement.
The number of positive charge-pump stages is given by:
where N
POS
is the number of positive charge-pump
stages, V
PL
is the positive linear-regulator output,
V
MAIN
is the main step-up regulator output, V
D
is the
forward voltage drop of the charge-pump diode, and
V
DROPOUT
is the dropout margin for the linear regula-
tor. Use V
DROPOUT
= 2V.
N
V
V
V
V
V
POS
PL
DROPOUT
MAIN
MAIN
D
=
+
×
-
-2
I
V
k
k
k
k
k
k
A
TH TYP
_
.
.
.
.
.
=
×
×
×
+
+
(
(
)
)
=
3 3
0 047
1
150
150
39 2
51 1
150
150
4 15
-
k
R
R
V
A
V
k
k
k
V
=
=
=
×
×
×
+
+
=
1 0 01
1 0 01
0 9802
.
3
4
0 9802
.
2 7
.
1 25
150
0 9802 51 1
.
0 1
.
2 7
.
150
0 005
.
1
0 2637
.
-
-
-
.
.
.
.
I
V
R
R
R
R
R
(
R
R
TH TYP
_
IN TYP
(
DS TYP
(
)
)
=
×
×
×
+
+
(
)
)
1
2
4
3
1
4
2
-
R
R
k
V
I
R
V
R
+ ×
R
mV
5
IN MIN
(
L MAX
(
DS MAX
(
IN MIN
(
3
4
2
2
1
1
= ×
×
×
+
)
)
)
)
-
-
V
R
1
k R
R
mV
5
V
I
R
k R
+ ×
3
R
IN MIN
(
IN MIN
(
L MAX
(
DS MAX
(
)
)
)
)
×
+
+
=
×
(
)
×
2
2
4
4
-
k
=
+
1
1
-
ε
ε
V
R
1
R
R
mV
5
V
I
R
R
+
1
R
R
IN MIN
(
IN MIN
(
L MAX
(
DS MAX
(
)
)
)
)
×
×
)
+
+
2
(
)
×
(
×
+
(
)
+
=
×
(
)
×
×
(
)
+
)
×
(
×
(
)
2
ε
1
1
1
4
1
3
4
1
ε
ε
ε
ε
ε
-
-
-
-
R
R
R
R
2
R
V
I
R
V
IN
PEAK MAX
DS MAX
(
IN
3
4
1
2
1
=
+
×
×
-
-
(
)
)
R
m
m
DS MAX
(
)
.
=
×
×
(
)
[
]
=
70
1 0 005
100 25
100
-
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|---|---|
| MAX1889EGE+ | 制造商:Maxim Integrated Products 功能描述:TRIPLE-OUTPUT TFT LCD POWER SUPPLY WITH FAULT PROTECTION - Rail/Tube |
| MAX1889ETE | 功能描述:LCD 驅(qū)動(dòng)器 RoHS:否 制造商:Maxim Integrated 數(shù)位數(shù)量:4.5 片段數(shù)量:30 最大時(shí)鐘頻率:19 KHz 工作電源電壓:3 V to 3.6 V 最大工作溫度:+ 85 C 最小工作溫度:- 20 C 封裝 / 箱體:PDIP-40 封裝:Tube |
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| MAX1889ETE+T | 功能描述:LCD 驅(qū)動(dòng)器 Quad-Output TFT LCD Power Supply RoHS:否 制造商:Maxim Integrated 數(shù)位數(shù)量:4.5 片段數(shù)量:30 最大時(shí)鐘頻率:19 KHz 工作電源電壓:3 V to 3.6 V 最大工作溫度:+ 85 C 最小工作溫度:- 20 C 封裝 / 箱體:PDIP-40 封裝:Tube |
| MAX1889ETE-T | 功能描述:LCD 驅(qū)動(dòng)器 RoHS:否 制造商:Maxim Integrated 數(shù)位數(shù)量:4.5 片段數(shù)量:30 最大時(shí)鐘頻率:19 KHz 工作電源電壓:3 V to 3.6 V 最大工作溫度:+ 85 C 最小工作溫度:- 20 C 封裝 / 箱體:PDIP-40 封裝:Tube |
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