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參數(shù)資料
| 型號： | MAX1748EUE+T |
| 廠商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | Triple-Output TFT-LCD DC-DC Converters |
| 中文描述： | 2 A SWITCHING REGULATOR, 1250 kHz SWITCHING FREQ-MAX, PDSO16 |
| 封裝： | 4.40 MM, 1.10 MM HEIGHT, 0.65 MM PITCH, EXPOSED PAD, TSSOP-16 |
| 文件頁數(shù)： | 16/16頁 |
| 文件大?。?/td> | 278K |
| 代理商： | MAX1748EUE+T |
MAX1748
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 (ILX(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 0.1A 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
VIN = 2.7V TO 5.5V
L1
IN
R1
Q
R
S
OSC
REF
FB
VMAIN
(UP TO 13V)
VOUT = [1 + (R1 / R2)] x VREF
VREF = 1.25V
ILIM
C1
C2
CCOMP
RCOMP
D1
INTG
+
-
+
-
MAX1748
Gm
-
+ -
CINTG
Figure 1. PWM Boost Converter Block Diagram
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| MAX1748EUE-TG069 | 制造商:Rochester Electronics LLC 功能描述: 制造商:Maxim Integrated Products 功能描述: |
| MAX1748EVKIT | 功能描述:電源管理IC開發(fā)工具 MAX1748 Eval Kit RoHS:否 制造商:Maxim Integrated 產品:Evaluation Kits 類型:Battery Management 工具用于評估:MAX17710GB 輸入電壓: 輸出電壓:1.8 V |
| 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 |
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