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(yè)數(shù)： 13/32頁(yè)
文件大?。?/td> 796K
代理商： MAX1889EGE
M
Triple-Output TFT LCD Power Supply
with Fault Protection
______________________________________________________________________________________
13
Standard Application Circuit
The standard application circuit (Figure 1) of the
MAX1889 generates +9V, +20V, and -7V outputs for
TFT LCD displays. The input voltage is from 2.7V to
5.5V. Table 1 lists the recommended component
options and Table 2 lists the component suppliers.
Detailed Description
The MAX1889 contains a high-performance, step-up
switching regulator, two low-cost linear-regulator con-
trollers, and multiple levels of protection circuitry. Figure
2 shows the system functional diagram of the device.
The output voltage of the main step-up converter (V
MAIN
)
can be set from V
IN
to 13V with an external resistive volt-
age-divider. The high switching frequency (500kH/1MHz)
of the main step-up converter and current-mode control
provide fast transient response and allow the use of low-
profile inductors and ceramic capacitors. The internal
power MOSFET minimizes the external component count
while achieving high efficiency by incorporating a loss-
less current-sensing technology.
The switching node (LX) can generate both positive
and negative voltage supplies by driving charge-pump
stages of capacitors and diodes. The user can use as
many charge-pump stages as needed to generate sup-
ply voltages of more than +30V and -15V. The positive
and negative linear-regulator controllers postregulate
the charge-pump supply voltages and allow users to
program power-up sequencing as well.
The unique input switch control of the MAX1889 senses
the current drawn from the input power supply by moni-
toring the voltage drop across the input P-channel
MOSFET and latches off if an overcurrent condition
lasts for more than the fault timer period. In addition, all
three outputs are monitored for fault conditions that last
longer than the fault latch timer. If the junction tempera-
ture of the IC exceeds +160
°
C, the device goes into a
latched shutdown state.
Main Step-Up Regulator
The main step-up regulator switches at 1MHz (or 500kHz)
and employs a current-mode control architecture to
maximize loop bandwidth to provide fast-transient
response to pulsed loads found in source drivers for TFT
LCD panels. Also, the high switching frequency allows
the use of low-profile inductors and capacitors to
minimize the thickness of LCD panel designs. The
integrated high-efficiency MOSFET and the IC
’
s built-in
soft-start function reduce the number of external com-
ponents required while controlling inrush current.
DESIGNATION
DESCRIPTION
C2, C3
3.3μF, 6.3V X5R ceramic capacitors (0805)
Taiyo Yuden JMK212BJ335MG
C4, C5, C6
4.7μF, 10V X7R ceramic capacitors (1210)
Taiyo Yuden LMK352BJ475MF
D1
1.0A, 30V Schottky diode (S-flat)
Toshiba CRS02
D2, D3, D4
200mA, 25V dual-series Schottky diodes
(SOT23)
Fairchild BAT54S
D5
250mA, 75V switching diode (SOT23)
Central Semiconductor CMPD914
L1
6.8μH, 1.3A inductor
Coilcraft LPO2506IB-682
P1
2.4A, 20V P-channel MOSFET
(3-pin SuperSOT)
Fairchild FDN304P
Q1
200mA, 40V NPN bipolar transistor (SOT23)
Fairchild MMBT3904
Q2
200mA, 40V PNP bipolar transistor (SOT23)
Fairchild MMBT3906
Table 1. Component List
SUPPLIER
PHONE
847-639-6400
408-822-2000
800-348-2496
949-455-2000
FAX
WEBSITE
Coilcraft
Fairchild
Taiyo Yuden
Toshiba
847-639-1469
408-822-2102
847-925-0899
949-859-3963
www.coilcraft.com
www.fairchildsemi.com
www.t-yuden.com
www.toshiba.com
Table 2. Component Suppliers
相關(guān)PDF資料
PDF描述
MAX1889ETE Triple-Output TFT LCD Power Supply with Fault Protection
MAX1889 Fixed-Point Digital Signal Processor 256-BGA
MAX1896 1.4MHz SOT23 Current-Mode Step-Up DC-DC Converter
MAX1896EUT-T Fixed-Point Digital Signal Processor 532-FCBGA
MAX1898 Fixed-Point Digital Signal Processor 532-FCBGA
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
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
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
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