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參數(shù)資料
| 型號： | MAX1889ETE |
| 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, 0.80 MM HEIGHT, ULTRA THIN, QFN-16 |
| 文件頁數(shù)： | 14/32頁 |
| 文件大?。?/td> | 796K |
| 代理商： | MAX1889ETE |
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M
Triple-Output TFT LCD Power Supply
with Fault Protection
14
______________________________________________________________________________________
Depending on the input-to-output voltage ratio, the reg-
ulator controls the output voltage and the power deliv-
ered to the output by modulating the duty cycle (D) of
the power MOSFET in each switching cycle. The duty
cycle of the MOSFET is approximated by:
On the rising edge of the internal clock, the controller
sets a flip-flop, which turns on the N-channel MOSFET
(Figure 3). The input voltage is applied across the
inductor. The inductor current ramps up linearly, storing
energy in a magnetic field. Once the sum of the feed-
back voltage error-amplifier output, slope-compensa-
tion, and current-feedback signals trip the multi-input
PWM comparator, the MOSFET turns off, and the flip-
flop resets. Since the inductor current is continuous, a
transverse potential develops across the inductor that
turns on the diode (D1). The voltage across the inductor
becomes the difference between the output voltage and
the input voltage. This discharge condition forces the
current through the inductor to ramp back down, trans-
ferring the energy to the output capacitor and the load.
The MOSFET remains off for the rest of the clock cycle.
D
V
V
V
MAIN
IN
MAIN
≈
-
+
-
+
-
+
-
+
-
+
-
ILIM
CURRENT
SENSE
OSC
ILIM
COMPARATOR
RESET DOMINANT
+
-
+
-
Σ
S
R
Q
SSDONE
SOFT-START
REFOUT
SSOK
REFIN
CLK
ONMN
REF
FB
SLOPE_COMP
PGND
LX
FAULT M
EN
MAX1889
Figure 3. Main Step-Up Regulator Functional Diagram
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX1889ETE+ | 功能描述:直流/直流開關(guān)轉(zhuǎn)換器 Quad-Output TFT LCD Power Supply RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開關(guān)頻率:1.5 MHz 輸出電壓:4.6 V 輸出電流:250 mA 輸出端數(shù)量:2 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT |
| 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 |
| MAX1889EVKIT | 功能描述:電源管理IC開發(fā)工具 MAX1889 Eval Kit RoHS:否 制造商:Maxim Integrated 產(chǎn)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 |
| MAX188ACAP | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC Integrated Circuits (ICs) RoHS:否 制造商:Texas Instruments 通道數(shù)量:2 結(jié)構(gòu):Sigma-Delta 轉(zhuǎn)換速率:125 SPs to 8 KSPs 分辨率:24 bit 輸入類型:Differential 信噪比:107 dB 接口類型:SPI 工作電源電壓:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-32 |
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