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参数资料
| 型号： | MAX1880EUG+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 19/39页 |
| 文件大小： | 0K |
| 描述： | IC DC-DC CONV QUAD LCD 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： | 4 |
| 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
L1
6.8 μ H
INPUT
MAIN
V IN = 3.3V
C IN
4.7 μ F
R RDY
100k ?
C1
0.22 μ F
IN
SHDN
LX
FB
R2
274k ?
C OUT
(2) 4.7 μ F
V MAIN = 8V
TO LOGIC
LDO
MAIN
(8V)
RDY
SUPL
LDOOUT
SUPB
SUPN
R2
49.9k ?
V LDOOUT = 5V C LDO
4.7 μ F
R8
49.9k ?
R7
150k ?
MAX1778
SUPP
DRVP
C4
0.1 μ F
C5
1.0 μ F
NEGATIVE
C2
0.1 μ F
FBL
DRVN
FBN
FBP
C4
0.1 μ F
R3
750k ?
C7
1.0 μ F
POSITIVE
V POS = 20V
V NEG = -5V
C3
1.0 μ F
R5
200k ?
R6
R4
49.9k ?
49.9k ?
C REF
0.22 μ F
REF
INTG
BUFOUT
BUF-
BUF+
C BUF
1.0 μ F
BUFFER OUTPUT
V BUFOUT = V SUPB /2
FLTSET
PGND
Figure 1. Typical Application Circuit
Detailed Description
The MAX1778/MAX1880–MAX1885 are highly efficient
multiple-output power supplies for thin-film transistor
(TFT) liquid crystal display (LCD) applications. The
devices contain one high-power step-up converter, two
low-power charge pumps, an operational transconduc-
tance amplifier (VCOM buffer), and a low-dropout linear
regulator. The primary step-up converter uses an internal
N-channel MOSFET to provide maximum efficiency and
to minimize the number of external components. The out-
put voltage of the main step-up converter (V MAIN ) can
be set from V IN to 13V with external resistors.
The dual charge pumps (MAX1778/MAX1880–MAX1882
only) independently regulate a positive output (V POS )
and a negative output (V NEG ). These low-power outputs
use external diode and capacitor stages (as many
stages as required) to regulate output voltages from -
40V to +40V. A unique control scheme minimizes output
ripple as well as capacitor sizes for both charge pumps.
Maxim Integrated
GND
TGND
A resistor-programmable 40mA linear regulator
(MAX1778/MAX1881/MAX1883/MAX1884 only) can
provide preregulation or postregulation for any of the
supplies. For higher current applications, an external
transistor can be added.
Additionally, the VCOM buffer provides a high current
output that is ideal for driving capacitive loads, such as
the backplane of a TFT LCD panel. The positive feed-
back input features dual-mode operation, allowing this
input to be connected to an internal 50% resistive-
divider between the buffer ’s supply voltage and
ground, or externally adjusted for other voltages.
Also included in the MAX1778/MAX1880–MAX1885 is a
precision 1.25V reference that sources up to 50μA,
logic shutdown, soft-start, power-up sequencing,
adjustable fault detection, thermal shutdown, and an
active-low, open-drain ready output.
19
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX1880EUG+ | 功能描述:直流/直流开关转换器 Quad-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 |
| MAX1880EUG+T | 功能描述:直流/直流开关转换器 Quad-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 |
| MAX1880EUG-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 |
| MAX1881EUG | 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 |
| MAX1881EUG+ | 功能描述:直流/直流开关转换器 Quad-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 |
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