參數(shù)資料
型號(hào)： MAX1513ETP
廠商： MAXIM INTEGRATED PRODUCTS INC
元件分類： 穩(wěn)壓器
英文描述： TFT-LCD Power-Supply Controllers
中文描述： SWITCHING CONTROLLER, 1725 kHz SWITCHING FREQ-MAX, PQCC20
封裝： 4 X 4 MM, 0.80 MM HEIGHT, MO-220-VGGD, TQFN-20
文件頁數(shù)： 24/28頁
文件大?。?/td> 540K
代理商： MAX1513ETP
M
TFT-LCD Power-Supply Controllers
24
______________________________________________________________________________________
Selecting the Number of Charge-Pump Stages
For highest efficiency, always choose the lowest num-
ber of charge-pump stages that meet the output volt-
age requirement. Figures 13 and 14 show the positive
and negative charge-pump output voltages for a given
V
MAIN
for one-, two-, and three-stage charge pumps.
The number of positive charge-pump stages is given by:
where n
POS
is the number of positive charge-pump
stages, V
GON
is the gate-on linear-regulator REG P out-
put, 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 reg-
ulator. Use V
DROPOUT
= 0.3V.
The number of negative charge-pump stages is given by:
where n
NEG
is the number of negative charge-pump
stages, V
GOFF
is the gate-off linear-regulator REG N
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 reg-
ulator. Use V
DROPOUT
= 0.3V.
The above equations are derived based on the
assumption that the first stage of the positive charge
pump is connected to V
MAIN
and the first stage of the
negative charge pump is connected to ground.
Sometimes fractional stages are more desirable for bet-
ter efficiency. This can be done by connecting the first
stage to V
IN
or another available supply. If the first
charge-pump stage is powered from V
IN
, then the
above equations become:
Flying Capacitors
Increasing the flying capacitor (C
X
) value lowers the
effective source impedance and increases the output-
current capability. Increasing the capacitance indefinite-
ly has a negligible effect on output-current capability
because the switch resistance and the diode impedance
place a lower limit on the source impedance. A 0.1μF
ceramic capacitor works well in most low-current appli-
cations. The flying capacitor’s voltage rating must
exceed the following:
where n is the stage number in which the flying capaci-
tor appears, and V
MAIN
is the output voltage of the
main step-up regulator.
Charge-Pump Output Capacitor
Increasing the output capacitance or decreasing the
ESR reduces the output ripple voltage and the peak-to-
peak voltage during load transients. With ceramic
V
n
V
CX
MAIN
>
×
n
V
V
V
V
V
n
V
V
V
V
V
POS
GON
DROPOUT
MAIN
+
IN
D
NEG
GOFF
DROPOUT
-
2
IN
MAIN
D
+
-
×
=
=
×
-
-
+
2
n
V
V
V
V
NEG
GOFF
MAIN
DROPOUT
×
- 2
D
+
=
-
n
V
V
V
V
V
POS
GON
DROPOUT
MAIN
- 2
MAIN
D
+
-
×
=
POSITIVE CHARGE-PUMP
OUTPUT VOLTAGE vs. V
MAIN
V
MAIN
(V)
G
12
10
8
6
4
10
20
30
40
50
60
0
2
14
2-STAGE CHARGE-PUMP
3-STAGE CHARGE-PUMP
V
D
= 0.3V TO 1V
1-STAGE CHARGE-PUMP
Figure 13. Positive Charge-Pump Output Voltage vs. VMAIN
NEGATIVE CHARGE-PUMP
OUTPUT VOLTAGE vs. V
MAIN
V
MAIN
(V)
G
12
10
8
6
4
-40
-35
-30
-25
-20
-15
-10
-5
-0
-45
2
14
1-STAGE
CHARGE-PUMP
2-STAGE
CHARGE-PUMP
3-STAGE
CHARGE-PUMP
V
D
= 0.3V TO 1V
Figure 14. Negative Charge-Pump Output Voltage vs. VMAIN
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參數(shù)描述
MAX1513ETP+ 功能描述:顯示驅(qū)動(dòng)器和控制器 TFT-LCD Power Supply Controller RoHS:否 制造商:Panasonic Electronic Components 工作電源電壓:2.7 V to 5.5 V 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-44 封裝:Reel
MAX1513ETP+T 功能描述:顯示驅(qū)動(dòng)器和控制器 TFT-LCD Power Supply Controller RoHS:否 制造商:Panasonic Electronic Components 工作電源電壓:2.7 V to 5.5 V 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-44 封裝:Reel
MAX1513ETP-T 功能描述:顯示驅(qū)動(dòng)器和控制器 RoHS:否 制造商:Panasonic Electronic Components 工作電源電壓:2.7 V to 5.5 V 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-44 封裝:Reel
MAX1513EVKIT 功能描述:電源管理IC開發(fā)工具 MAX1513/14 Eval Kit RoHS:否 制造商:Maxim Integrated 產(chǎn)品:Evaluation Kits 類型:Battery Management 工具用于評(píng)估:MAX17710GB 輸入電壓: 輸出電壓:1.8 V
MAX1514ETP 功能描述:DC/DC 開關(guān)控制器 RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關(guān)頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數(shù)量:1 最大工作溫度:+ 125 C 安裝風(fēng)格: 封裝 / 箱體:CPAK
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