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参数资料
| 型号： | MAX1778EUG+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 34/39页 |
| 文件大小： | 0K |
| 描述： | IC DCDC CONV MULTI OUT 24TSSOP |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 62 |
| 应用： | 转换器，TFT，LCD |
| 输入电压： | 2.7 V ~ 5.5 V |
| 输出数： | 5 |
| 输出电压： | 2.7 V ~ 13 V |
| 工作温度： | 0°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 24-TSSOP（0.173"，4.40mm 宽） |
| 供应商设备封装： | 24-TSSOP |
| 包装： | 管件 |
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MAX1778/MAX1880–MAX1885
Quad-Output TFT LCD DC/DC
Converters with Buffer
INPUT
L1
6.8 μ H
STARTUP MAIN
V MAIN(START) = 8V
SYSTEM MAIN
V MAIN(SYS) = 8V
V IN = 3.3V
C IN
4.7 μ F
C1
IN
SHDN
LX
FB
R1
274k ?
C OUT
(2) 3.3 μ F
C8
3.3 μ F
0.22 μ F
R2
SUPP
49.9k ?
C10
0.1 μ F
INTG
MAX1778
DRVP
C4
0.1 μ F
C6
0.1 μ F
C5
1.0 μ F
C7
1.0 μ F
R7
10k ?
C REF
0.22 μ F
R9
30k ?
REF
FBP
R3
750k ?
STARTUP
SYSTEM
R10
100k ?
FLTSET
R4
49.9k ?
POSITIVE
V POS(START) = 20V
Q3
Q2
POSITIVE
V POS(SYS) = 20V
INPUT
V IN = 3.3V
RDY
PGND
TGND
GND
R RDY
5.1k ?
R8
100k ?
Figure 10. Power-Up Sequencing and Fault Protection
converter steps up the input voltage so that the linear
regulator will not drop out. Therefore, to guarantee that
the external pass transistor does not saturate, the step-
up converter’s output voltage must be set above the lin-
ear regulator ’s output voltage plus the transistor ’s
saturation rating (V MAIN ≥ V LDO + V SAT ).
Power-Up Sequencing and Fault Protection
The MAX1778/MAX1880–MAX1885’s fault protection
cannot be activated until the power-up sequence is
successfully completed and the power-ready output
goes low. Therefore, faults on the main output or posi-
tive charge-pump output could damage the controller
or external components. Additional fault protection can
be added as shown in Figure 10. The external MOSFET
and pnp transistor isolate the positive outputs during
startup. When the controller finishes the power-up
sequence, the power-ready output goes low, turning on
34
the pnp transistor. Any fault on the positive charge-
pump output pulls down the charge pump’s output volt-
age and triggers the fault protection; otherwise, the
MOSFET’s gate slow charges. Once the MOSFET turns
on, any faults on the main step-up converter’s output
pull down the main output voltage and trigger the fault
protection.
VCOM Buffer Startup
The VCOM buffer does not include soft-start. Therefore,
once the VCOM buffer turns on, it draws high surge
currents while charging the output capacitance. In
some applications, the buffer ’s high startup surge
current could potentially trip the fault-detection circuit,
forcing the controller to shut down. In these cases,
adding a soft-start resistive-divider between SUPB and
BUFOUT reduces the startup surge current and voltage
drops associated with this load (Figure 11), as shown in
Maxim Integrated
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX1778EUG+ | 功能描述:直流/直流开关转换器 Quad-Output TFT LCD w/Buffer RoHS:否 制造商:STMicroelectronics 最大输入电压:4.5 V 开关频率:1.5 MHz 输出电压:4.6 V 输出电流:250 mA 输出端数量:2 最大工作温度:+ 85 C 安装风格:SMD/SMT |
| MAX1778EUG+T | 功能描述:直流/直流开关转换器 Quad-Output TFT LCD w/Buffer RoHS:否 制造商:STMicroelectronics 最大输入电压:4.5 V 开关频率:1.5 MHz 输出电压:4.6 V 输出电流:250 mA 输出端数量:2 最大工作温度:+ 85 C 安装风格:SMD/SMT |
| MAX1778EUG-T | 功能描述:直流/直流开关转换器 RoHS:否 制造商:STMicroelectronics 最大输入电压:4.5 V 开关频率:1.5 MHz 输出电压:4.6 V 输出电流:250 mA 输出端数量:2 最大工作温度:+ 85 C 安装风格:SMD/SMT |
| MAX1778EVKIT | 功能描述:电源管理IC开发工具 MAX1778/80/81/82 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 |
| MAX1779EUE | 功能描述:直流/直流开关转换器 RoHS:否 制造商:STMicroelectronics 最大输入电压:4.5 V 开关频率:1.5 MHz 输出电压:4.6 V 输出电流:250 mA 输出端数量:2 最大工作温度:+ 85 C 安装风格:SMD/SMT |
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