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参数资料
| 型号： | MAX1518ETJ |
| 厂商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分类： | 稳压器 |
| 英文描述： | TFT-LCD DC-DC Converters with Operational Amplifiers |
| 中文描述： | 1.6 A SWITCHING REGULATOR, 1380 kHz SWITCHING FREQ-MAX, PQCC32 |
| 封装： | 5 X 5 MM, 0.80 MM HEIGHT, MO-220-WHHD2, TQFN-32 |
| 文件页数： | 12/26页 |
| 文件大小： | 919K |
| 代理商： | MAX1518ETJ |
M
TFT-LCD DC-DC Converters with
Operational Amplifiers
12
______________________________________________________________________________________
Typical Operating Circuit
The MAX1518
Typical Operating Circuit
(Figure 1) is a
complete power-supply system for TFT LCDs. The cir-
cuit generates a +13V source-driver supply and +24V
and -8V gate-driver supplies. The input voltage range
for the IC is from +2.6V to +5.5V. The listed load cur-
rents in Figure 1 are available from a +4.5V to +5.5V
supply. Table 1 lists some recommended components,
and Table 2 lists the contact information of component
suppliers.
Detailed Description
The MAX1516/MAX1517/MAX1518 contain a high-
performance step-up switching regulator, two low-cost
linear-regulator controllers, multiple high-current opera-
tional amplifiers, and startup timing and level-shifting
functionality useful for active-matrix TFT LCDs. Figure 2
shows the MAX1518
Functional Diagram
.
Main Step-Up Regulator
The main step-up regulator employs a current-mode,
fixed-frequency PWM architecture to maximize loop
bandwidth and provide fast transient response to
pulsed loads typical of TFT-LCD panel source drivers.
The 1.2MHz switching frequency allows the use of low-
profile inductors and ceramic capacitors to minimize
the thickness of LCD panel designs. The integrated
high-efficiency MOSFET and the IC’s built-in digital
soft-start functions reduce the number of external com-
ponents required while controlling inrush currents. The
output voltage can be set from V
IN
to 13V with an exter-
nal resistive voltage-divider. To generate an output volt-
age greater than 13V, an external cascoded MOSFET
is needed. See the
Generating Output Voltages > 13V
section in the
Design Procedures
.
The regulator controls the output voltage and the power
delivered to the output by modulating the duty cycle (D)
of the internal power MOSFET in each switching cycle.
The duty cycle of the MOSFET is approximated by:
Figure 3 shows the
Functional Diagram
of the step-up
regulator. An error amplifier compares the signal at FB
to 1.236V and changes the COMP output. The voltage
at COMP sets the peak inductor current. As the load
varies, the error amplifier sources or sinks current to the
COMP output accordingly to produce the inductor peak
current necessary to service the load. To maintain sta-
bility at high duty cycles, a slope-compensation signal
is summed with the current-sense signal.
On the rising edge of the internal clock, the controller
sets a flip-flop, turning on the n-channel MOSFET and
applying the input voltage across the inductor. The cur-
rent through the inductor ramps up linearly, storing
energy in its magnetic field. Once the sum of the cur-
rent-feedback signal and the slope compensation
exceeds the COMP voltage, the controller resets the
flip-flop and turns off the MOSFET. Since the inductor
current is continuous, a transverse potential develops
across the inductor that turns on the diode (D1). The
voltage across the inductor then becomes the differ-
ence between the output voltage and the input voltage.
D
V
V
V
MAIN
IN
MAIN
≈
DESIGNATION
DESCRIPTION
C1
22μF, 6.3V X5R ceramic capacitor (1210)
TDK C3225X5R0J227M
C2
22μF, 16V X5R ceramic capacitor (1812)
TDK C4532X5X1C226M
D1
3A, 30V Schottky diode (M-flat)
Toshiba CMS02
D2, D3
200mA, 100V, dual ultra-fast diodes (SOT23)
Fairchild MMBD4148SE
L1
3.0μH, 3A inductor
Sumida CDRH6D28-3R0
Q1
200mA, 40V pnp bipolar transistor (SOT23)
Fairchild MMBT3906
Q2
200mA, 40V npn bipolar transistor (SOT23)
Fairchild MMBT3904
Table 1. Component List
SUPPLIER
PHONE
408-822-2000
847-545-6700
847-803-6100
949-455-2000
FAX
WEBSITE
Fairchild
Sumida
TDK
Toshiba
408-822-2102
847-545-6720
847-390-4405
949-859-3963
www.fairchildsemi.com
www.sumida.com
www.component.tdk.com
www.toshiba.com/taec
Table 2. Component Suppliers
相关PDF资料 |
PDF描述 |
|---|---|
| MAX151AENG | LJT 18C 18#20 SKT PLUG |
| MAX151BCNG | 300kHz 10-Bit A/D Converter with Refrence and T/H |
| MAX151BENG | 300kHz 10-Bit A/D Converter with Refrence and T/H |
| MAX151ACNG | 300kHz 10-Bit A/D Converter with Refrence and T/H |
| MAX151ACWG | 300kHz 10-Bit A/D Converter with Refrence and T/H |
相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX1518ETJ+ | 功能描述:LCD 驱动器 TFT-LCD DC-DC Conv w/Op Amps RoHS:否 制造商:Maxim Integrated 数位数量:4.5 片段数量:30 最大时钟频率:19 KHz 工作电源电压:3 V to 3.6 V 最大工作温度:+ 85 C 最小工作温度:- 20 C 封装 / 箱体:PDIP-40 封装:Tube |
| MAX1518ETJ+T | 功能描述:LCD 驱动器 TFT-LCD DC-DC Conv w/Op Amps RoHS:否 制造商:Maxim Integrated 数位数量:4.5 片段数量:30 最大时钟频率:19 KHz 工作电源电压:3 V to 3.6 V 最大工作温度:+ 85 C 最小工作温度:- 20 C 封装 / 箱体:PDIP-40 封装:Tube |
| MAX1518ETJ-T | 功能描述:LCD 驱动器 RoHS:否 制造商:Maxim Integrated 数位数量:4.5 片段数量:30 最大时钟频率:19 KHz 工作电源电压:3 V to 3.6 V 最大工作温度:+ 85 C 最小工作温度:- 20 C 封装 / 箱体:PDIP-40 封装:Tube |
| MAX1518EVKIT | 功能描述:电源管理IC开发工具 MAX1518 Eval Kit RoHS:否 制造商:Maxim Integrated 产品:Evaluation Kits 类型:Battery Management 工具用于评估:MAX17710GB 输入电压: 输出电压:1.8 V |
| MAX1518EVKIT+ | 功能描述:电源管理IC开发工具 MAX1518 Eval Kit RoHS:否 制造商:Maxim Integrated 产品:Evaluation Kits 类型:Battery Management 工具用于评估:MAX17710GB 输入电压: 输出电压:1.8 V |
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