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参数资料
| 型号： | MAX1729EUB |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 6/12页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK BST ADJ 2.5MA 10UMAX |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 50 |
| 类型： | 降压（降压），升压（升压） |
| 输出类型： | 可调式 |
| 输出数： | 1 |
| 输出电压： | 2.5 V ~ 16 V |
| 输入电压： | 2.7 V ~ 5.5 V |
| 电流 - 输出： | 2.5mA |
| 同步整流器： | 无 |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 10-TFSOP，10-MSOP（0.118"，3.00mm 宽） |
| 包装： | 管件 |
| 供应商设备封装： | 10-µMAX |
ECB and LCD Display Bias Supply with Accurate
Output Voltage and Temperature Compensation
Pin Description
PIN
1
2
3
4
5
6
7
8
9
10
NAME
IN
TC
REF
COMP
FB
CTLIN
OUT
PS
LX
GND
FUNCTION
Supply Input. Bypass with 0.1μF capacitor to ground. Connect to supply side of inductor (L1).
Temperature-Sensor Output. Bypass to GND with a 1000pF capacitor.
Reference Voltage Output. Bypass to GND with a 0.1μF capacitor.
Compensation Pin. In internal feedback mode (Figure 2), bypass with a 1μF capacitor. In external feedback
mode, COMP is a buffered inverse version of CTLIN (Figure 3).
Feedback and Mode Control Input. Connect to GND for internal feedback mode operation.
Control Input. Drive low for more than 1.2ms to put the device into shutdown.
Bypass to GND with a 1.0μF capacitor.
Output of boost converter and input to LDO. Bypass to GND with a 0.068μF capacitor.
Drain of the internal MOSFET Switch
Ground
Detailed Description
The MAX1729 is designed to provide bias voltage for
boost converter’s input and output voltage values, as fol-
lows:
ECB or LCD displays. It is composed of a step-up
DC-DC converter followed by a linear regulator
(Figure 1), a combination that provides step-up/step-
down voltage conversion while minimizing output rip-
ple. The device allows you to adjust a display’s color or
contrast by dynamically adjusting the MAX1729’s out-
t ON =
t OFF ≥
K
V IN
K
V PS ? V IN
put voltage using a PWM control signal. In internal
feedback mode, the output voltage is adjustable
between +2.5V and +16V. In external feedback mode,
where K is typically 8V-μs. This timing maintains discon-
tinuous conduction and sets the peak inductor current
(I PEAK ) to:
the output voltage is adjustable, and its range is set by
a resistor network that is programmed to match the out-
put voltage range of LCD/ECB displays needing a max-
I PEAK =
K
L
imum output up to +18V.
Boost Converter
The MAX1729’s DC-DC boost converter is implemented
with an on-chip N-channel MOSFET, a diode, and an
error comparator. The IC’s unique PFM control system
varies the on-time and off-time of the switch based on the
where L is the inductance of L1 (Figures 2, 3, and 4).
When the error comparator detects that the drop across
the linear regulator (V PS - V OUT ) is less than approximate-
ly 0.6V, the internal switch is turned on (t ON initiates) and
current through the inductor ramps to I PEAK . At the end of
t ON , the switch is turned off for at least t OFF , allowing the
6
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX1729EUB-T | 功能描述:直流/直流开关转换器 ECB & LCD Display Bias Supply 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 |
| MAX172ACNG | 功能描述:模数转换器 - ADC Integrated Circuits (ICs) RoHS:否 制造商:Texas Instruments 通道数量:2 结构:Sigma-Delta 转换速率:125 SPs to 8 KSPs 分辨率:24 bit 输入类型:Differential 信噪比:107 dB 接口类型:SPI 工作电源电压:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-32 |
| MAX172ACNG+ | 功能描述:模数转换器 - ADC 12-Bit 100ksps 5.25V- Precision ADC RoHS:否 制造商:Texas Instruments 通道数量:2 结构:Sigma-Delta 转换速率:125 SPs to 8 KSPs 分辨率:24 bit 输入类型:Differential 信噪比:107 dB 接口类型:SPI 工作电源电压:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-32 |
| MAX172ACWG | 功能描述:模数转换器 - ADC RoHS:否 制造商:Texas Instruments 通道数量:2 结构:Sigma-Delta 转换速率:125 SPs to 8 KSPs 分辨率:24 bit 输入类型:Differential 信噪比:107 dB 接口类型:SPI 工作电源电压:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-32 |
| MAX172ACWG+ | 功能描述:模数转换器 - ADC 12-Bit 100ksps 5.25V- Precision ADC RoHS:否 制造商:Texas Instruments 通道数量:2 结构:Sigma-Delta 转换速率:125 SPs to 8 KSPs 分辨率:24 bit 输入类型:Differential 信噪比:107 dB 接口类型:SPI 工作电源电压:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-32 |
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