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参数资料
| 型号： | MAX1778EUG+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 33/39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
Applications Information
Low-Profile Components
Notebook applications generally require low-profile
components, potentially limiting the circuit ’s perfor-
mance. For example, low-profile inductors typically
have lower saturation ratings and more series resis-
tance, limiting output current and efficiency. Low-profile
capacitors have lower voltage ratings for a given
capacitance value, so 3.3μF low-profile capacitors with
voltage ratings greater than 10V were not available at
the time of publication.
Desktop Monitors
Monitor applications do not have the same component
height restrictions associated with laptops, allowing
more flexibility in component selection (Figure 8).
L1
Larger output capacitors with higher voltage ratings
allow configurations with output voltages above 10V.
Additionally, physically larger inductors with less series
resistance and higher saturation ratings provide more
output current and higher efficiency.
Input Voltage Above and
Below the Output Voltage
Combining the step-up converter and linear regulator
as shown in Figure 9 provides output-voltage regulation
above and below the input voltage. Supplied by the
step-up converter, the linear regulator output provides
a constant output voltage (V LDO ). When the input volt-
age exceeds the main step-up converter’s nominal out-
put voltage, the controller stops switching but the linear
regulator maintains the output voltage. When the input
voltage drops below the output voltage, the step-up
POWER INPUT
6.8 μ H
V BATT = 10V TO 15V
C IN
4.7 μ F
R1
511k ?
C OUT
(3) 3.3 μ F
INPUT
V IN = 3.3V TO 5V
C1
0.1 μ F
R RDY
100k ?
IN
SHDN
LX
FB
R2
49.9k ?
TO LOGIC
RDY
SUPL
BUFFER OUTPUT
V BUFOUT = V SUPB /2
C BUF
1.0 μ F
C2
0.1 μ F
BUFOUT
BUF-
MAX1778
LDOOUT
C6
0.1 μ F
C LDOOUT
3.3 μ F
Q1
475k ?
V LDO = 13V
NEGATIVE
V NEG = -12V
C3
1.0 μ F
C REF
0.22 μ F
R5
R6
49.9k ?
R9
30k ?
R10
100k ?
C INTG
470pF
DRVN
FBN
REF
FLTSET
INTG
PGND
SUPB
SUPN
SUPP
FBL
DRVP
FBP
BUF+
GND
TGND
R7
470k ?
C4
0.1 μ F
R4
49.9k ?
C7
0.1 μ F
R8
49.9k ?
R3
909k ?
R9
6.8k ?
C5
1.0 μ F
LDO
C LDO
(2) 3.3 μ F
POSITIVE
V POS = 24V
Figure 9. Input Voltage Above and Below the Output Voltage
Maxim Integrated
33
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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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