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参数资料
| 型号： | MAX8795AETJ+C7P |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 16/31页 |
| 文件大小： | 0K |
| 描述： | IC TFT-LCD DC/DC CONV 32-TQFN |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 60 |
| 应用： | 转换器，TFT，LCD |
| 输入电压： | 2.5 V ~ 6 V |
| 输出数： | 8 |
| 输出电压： | 2.5 V ~ 18 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 32-WFQFN 裸露焊盘 |
| 供应商设备封装： | 32-TQFN-EP（5x5） |
| 包装： | 管件 |
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TFT-LCD DC-DC Converter with
Operational Amplifiers
Table 2. Component Suppliers
SUPPLIER
Fairchild
Sumida
TDK
Toshiba
V CN
PHONE
408-822-2000
847-545-6700
847-803-6100
949-455-2000
V CP
FAX
408-822-2102
847-545-6720
847-390-4405
949-859-3963
WEBSITE
www.fairchildsemi.com
www.sumida.com
www.component.tdk.com
www.toshiba.com/taec
Detailed Description
The MAX8795A contains a high-performance step-up
switching regulator, two low-cost linear-regulator con-
V IN
LX
V MAIN
trollers, multiple high-current operational amplifiers,
and startup timing and level-shifting functionality useful
IN
STEP-UP
FB
for active-matrix TFT LCDs. Figure 2 shows the
MAX8795A functional diagram.
CONTROLLER
Main Step-Up Regulator
COMP
PGND
The main step-up regulator employs a current-mode,
AGND
V CP
fixed-frequency PWM architecture to maximize loop
bandwidth and provide fast transient response to
MAX8795A
GATE-ON
CONTROLLER
DRVP
FBP
V GON
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
SRC
DEL
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
COM
DRN
SWITCH
CONTROL
CTL
V CN
output voltage can be set from V IN to 18V with an exter-
nal resistive voltage-divider.
The regulator controls the output voltage and the power
delivered to the output by modulating the duty cycle (D)
DRVN
of the internal power MOSFET in each switching cycle.
D ≈ MAIN IN
SUP
NEG1
OUT1
POS1
NEG2
OP1
GATE-OFF
CONTROLLER
REF
FBN
REF
NEG4
V GOFF
The duty cycle of the MOSFET is approximated by:
V ? V
V MAIN
Figure 3 shows the functional diagram of the step-up
regulator. An error amplifier compares the signal at FB
to 1.233V and changes the COMP output. The voltage
at COMP sets the peak inductor current. As the load
OUT2
OP2
OP4
OUT4
varies, the error amplifier sources or sinks current to the
COMP output accordingly to produce the inductor peak
POS2
POS4
NEG5
current necessary to service the load. To maintain sta-
bility at high duty cycles, a slope-compensation signal
OUT3
OP3
OP5
OUT5
is summed with the current-sense signal.
On the rising edge of the internal clock, the controller sets
POS3
EP
BGND
POS5
a flip-flop, turning on the n-channel MOSFET and applying
the input voltage across the inductor. The current through
the inductor ramps up linearly, storing energy in its
magnetic field. Once the sum of the current-feedback
Figure 2. MAX8795A Functional Diagram
signal and the slope compensation exceeds the COMP
16
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX8795AEVKIT+ | 功能描述:电源管理IC开发工具 MAX8795A 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 |
| MAX8795AGCJ/V+ | 功能描述:LCD 驱动器 TFT-LCD DC/DC Converter 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 |
| MAX8795AGCJ/V+T | 功能描述:LCD 驱动器 TFT-LCD DC/DC Converter 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 |
| MAX8795AGCJ+ | 功能描述:LCD 驱动器 TFT-LCD DC/DC Converter 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 |
| MAX8795AGCJ+T | 功能描述:LCD 驱动器 TFT-LCD DC/DC Converter 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 |
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