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參數資料
| 型號： | MAX1748-MAX8726 |
| 廠商： | Maxim Integrated Products, Inc. |
| 元件分類： | DC/DC變換器 |
| 英文描述： | Triple-Output TFT-LCD DC-DC Converters |
| 中文描述： | 三輸出的TFT - LCD的DC - DC轉換器 |
| 文件頁數： | 9/16頁 |
| 文件大小： | 277K |
| 代理商： | MAX1748-MAX8726 |
M
Triple-Output TFT LCD DC-DC Converter
_______________________________________________________________________________________
9
the soft-start period into four phases. During phase 1,
the MAX1748 limits the current limit to only 0.38A (see
Electrical Characteristics
), approximately a quarter of
the maximum current limit (I
LX(MAX)
). If the output does
not reach regulation within 1ms, soft-start enters phase
II and the current limit is increased by another 25%.
This process is repeated for phase III. The maximum
1.5A (typ) current limit is reached within 3.0ms or when
the output reaches regulation, whichever occurs first
(see the Startup Waveforms in the
Typical Operating
Characteristics
).
For the charge pumps, soft-start is achieved by control-
ling the rise rate of the output voltage. The output volt-
age regulates within 4ms, regardless of output
capacitance and load, limited only by the regulator
’
s
output impedance.
Shutdown
A logic-low level on
SHDN
disables all three MAX1748
converters and the reference. When shut down, supply
current drops to 0.1μA to maximize battery life and the
reference is pulled to ground. The output capacitance
and load current determine the rate at which each out-
put voltage will decay. A logic-level high on
SHDN
power activates the MAX1748 (see
Power-Up
Sequencing
). Do not leave
SHDN
floating. If unused,
connect
SHDN
to IN.
Power-Up Sequencing
Upon power-up or exiting shutdown, the MAX1748
starts a power-up sequence. First, the reference pow-
ers up. Then the main DC-DC step-up converter pow-
ers up with soft-start enabled. Once the main boost
LX
GND
PGND
1.25V
R2
V
IN
= 2.7V TO 5.5V
L1
IN
R1
Q
R
S
OSC
REF
FB
V
MAIN
(UP TO 13V)
V
OUT
=
[1 + (R1 / R2)] x V
REF
V
REF
= 1.25V
I
LIM
C1
C2
C
COMP
R
COMP
D1
INTG
+
+
+
-
+
-
-
MAX1748
Gm
+ -
C
INTG
Figure 1. PWM Boost Converter Block Diagram
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相關代理商/技術參數 |
參數描述 |
|---|---|
| MAX17491GTA+ | 功能描述:功率驅動器IC Notebook MOSFET Driver RoHS:否 制造商:Micrel 產品:MOSFET Gate Drivers 類型:Low Cost High or Low Side MOSFET Driver 上升時間: 下降時間: 電源電壓-最大:30 V 電源電壓-最小:2.75 V 電源電流: 最大功率耗散: 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Tube |
| MAX17491GTA+T | 功能描述:功率驅動器IC Notebook MOSFET Driver RoHS:否 制造商:Micrel 產品:MOSFET Gate Drivers 類型:Low Cost High or Low Side MOSFET Driver 上升時間: 下降時間: 電源電壓-最大:30 V 電源電壓-最小:2.75 V 電源電流: 最大功率耗散: 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Tube |
| MAX17495AATE+ | 制造商:Maxim Integrated Products 功能描述:- Rail/Tube |
| MAX17495AATE+T | 制造商:Maxim Integrated Products 功能描述:- Tape and Reel |
| MAX17496AATE+ | 制造商:Maxim Integrated Products 功能描述:- Rail/Tube |
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