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参数资料
| 型号： | MAX1778EUG+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 23/39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： | 2,500 |
| 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： | 带卷 (TR) |
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MAX1778/MAX1880–MAX1885
Quad-Output TFT LCD DC/DC
Converters with Buffer
MAX1778
SUPB
V SUPB
4.5V TO 13V
MAX1880
MAX1881
MAX1882
MAX1883
gm
BUFOUT
BUF-
C BUF
V BUFOUT
1.2V TO (V SUPB - 1.2V)
MAX1884
MAX1885
R
R11
BUF+
R
R12
( R11 + R12 ) V
125mV
GND
V BUFOUT =
R12
SUPB
Figure 6. VCOM Buffer Block Diagram
ready output signal are not affected by the regulation of
times, the amplifier’s transconductance increases as
the output current increases (see the Typical Operating
Characteristics).
The VCOM buffer’s positive feedback input features
dual mode operation. The buffer’s output voltage can
be internally set by a 50% resistive divider connected
to the buffer’s supply voltage (SUPB), or the output volt-
age can be externally adjusted for other voltages.
Shutdown ( S H D N )
A logic-low level on SHDN shuts down all of the con-
verters and the reference. When shut down, the supply
current drops to 0.1μA to maximize battery life, and the
reference is pulled to ground. The output capacitance,
feedback resistors, and load current determine the rate
at which each output voltage decays. A logic-level high
the linear regulator. While the main step-up converter
powers up, the output of the PWM comparator remains
low (Figure 2), and the step-up converter charges the
output capacitors, limited only by the maximum duty
cycle and current-limit comparator. When the step-up
converter approaches its nominal regulation value and
the PWM comparator’s output changes states for the
first time, the negative charge pump turns on. When the
negative output voltage reaches approximately 90% of
its nominal value (V FBN < 110mV), the positive charge
pump starts up. Finally, when the positive output volt-
age reaches 90% of its nominal value (V FBP > 1.125V),
the active-low ready signal ( RDY ) goes low (see the
Power Ready section), and the VCOM buffer powers
up. The MAX1883–MAX1885 do not contain the charge
pumps, but the power-up sequence still contains the
on
SHDN
power activates the MAX1778/
charge pumps’ startup logic, which appears as a delay
MAX1880–MAX1885 (see the Power-Up Sequencing
section). Do not leave SHDN floating. If unused, con-
nect SHDN to IN. A logic-level transition on SHDN
clears the fault latch.
Power-Up Sequencing
Upon power-up or exiting shutdown, the MAX1778/
MAX1880–MAX1885 start a power-up sequence. First,
the reference powers up. Then, the main DC-DC step-
up converter powers up with soft-start enabled. The lin-
ear regulator powers up at the same time as the main
step-up converter; however, the power sequence and
Maxim Integrated
(2 4096/fOSC) between the step-up converter reach-
ing regulation and when the ready signal and VCOM
buffer are activated.
Soft-Start
For the main step-up regulator, soft-start allows a grad-
ual increase of the current-limit level during startup to
reduce input surge currents. The MAX1778/MAX1880–
MAX1885 divide the soft-start period into four phases.
During the first phase, the controller limits the current
limit to only 0.38A (see the Electrical Characteristics),
approximately a quarter of the maximum current limit
23
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| 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 |
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| MAX1779EUE+ | 功能描述:直流/直流开关转换器 Triple-Output TFT LCD 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 |
| MAX1779EUE+T | 功能描述:直流/直流开关转换器 Triple-Output TFT LCD 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 |
| MAX1779EUE-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 |
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