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参数资料
| 型号： | MAX8753ETI+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 11/20页 |
| 文件大小： | 0K |
| 描述： | IC DC-DC CONV TFT LCD 28TQFN |
| 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： | 2.6 V ~ 5.5 V |
| 输出数： | 4 |
| 输出电压： | 2.6 V ~ 13 V |
| 工作温度： | 0°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 28-WFQFN 裸露焊盘 |
| 供应商设备封装： | 28-TQFN-EP（5x5） |
| 包装： | 管件 |
TFT LCD DC-DC Converter with
Integrated Charge Pumps
Table 2. Component Suppliers
SUPPLIER
Fairchild
Sumida
Taiyo Yuden
TDK
Toshiba
PHONE
408-822-2000
847-545-6700
408-573-4150
847-803-6100
949-455-2000
FAX
408-822-2102
847-545-6720
408-573-4159
847-390-4405
949-859-3963
WEBSITE
www.fairchildsemi.com
www.sumida.com
www.t-yuden.com
www.component.tdk.com
www.toshiba.com/taec
Detailed Description
The MAX8753 quadruple-output DC-DC converter pro-
vides the regulated voltages required by active-matrix,
TFT LCDs. Figure 1 shows the typical operating circuit.
It includes a high-power step-up regulator (V MAIN ), two
low-power charge pumps (V POS and V NEG ), and a low-
voltage, 300mA linear regulator (V LOGIC ). The primary
boost converter uses an internal n-channel MOSFET to
IN
DLP
INTG
STEP-UP
REGULATOR
LX
PGND
provide maximum efficiency and to minimize the num-
ber of external components. The output voltage of the
main boost converter (V MAIN ) can be set from V IN to
SHDN
ONLCD
SEQ
FB
13V with external resistors. The positive charge pump
regulates a positive output (V POS ) without external
switches or diodes. The negative charge pump regu-
lates a negative output (V NEG ) with external diodes. A
proprietary regulation algorithm minimizes output rip-
ple, as well as capacitor sizes for both charge pumps.
OUTL
FBL
LDO
REF
REF
GND
SUPN
Also included in the MAX8753 is a precision 1.25V ref-
erence that sources up to 50μA, logic shutdown, soft-
FBP
start, power-up sequencing, and fault detection. Figure
2 is the MAX8753 functional diagram.
Main Step-Up Regulator
The main step-up regulator employs a current-mode,
fixed-frequency PWM architecture to maximize loop
OUTP
C1N
C1P
C2N
POSITIVE
CHARGE-
PUMP
REGULATOR
NEGATIVE
CHARGE-
PUMP
REGULATOR
C3P
FBN
bandwidth and provide fast transient response to
pulsed loads and TFT LCD panel source driver applica-
C2P
tions. The high switching frequency (1MHz) allows the
use of low-profile inductors and ceramic capacitors to
minimize the thickness of LCD panel designs. The inte-
grated high-efficiency MOSFET and the IC ’ s built-in,
SUPP
MAX8753
D ≈ MAIN IN
digital, soft-start function reduces the number of exter-
nal components required while controlling inrush cur-
rent. The output voltage can be set from V IN to 13V with
an external resistive voltage-divider.
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:
V ? V
V MAIN
Figure 2. Functional Diagram
Figure 3 shows the block diagram of the step-up regu-
lator. A transconductance error amplifier compares the
signal at FB to 1.24V and changes the COMP output.
The voltage at COMP determines the current trip point
each time the internal MOSFET turns on. As the load
varies, the transconductance error amplifier sources or
sinks current to the COMP output accordingly to pro-
duce the inductor peak current necessary to service
the load. To maintain stability at high duty cycles, a
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX8753ETI+ | 功能描述:LCD 驱动器 TFT LCD Step-Up 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 |
| MAX8753ETI+T | 功能描述:LCD 驱动器 TFT LCD Step-Up 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 |
| MAX8753ETI-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 |
| MAX8753EVKIT | 功能描述:电源管理IC开发工具 MAX8753 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 |
| MAX8756ETI+ | 功能描述:电流和电力监控器、调节器 Interleaved Dual Power-Supply Ctlr RoHS:否 制造商:STMicroelectronics 产品:Current Regulators 电源电压-最大:48 V 电源电压-最小:5.5 V 工作温度范围:- 40 C to + 150 C 安装风格:SMD/SMT 封装 / 箱体:HPSO-8 封装:Reel |
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