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參數(shù)資料
| 型號(hào)： | MAX1729 |
| 廠商： | Maxim Integrated Products, Inc. |
| 元件分類(lèi)： | 數(shù)字信號(hào)處理 |
| 英文描述： | Replaced by TMS320VC5506 : Digital Signal Processors 100-LQFP 0 to 0 |
| 中文描述： | ECB及LCD偏置電源，帶有精確的輸出電壓及溫度補(bǔ)償 |
| 文件頁(yè)數(shù)： | 6/12頁(yè) |
| 文件大小： | 158K |
| 代理商： | MAX1729 |
M
Detailed Desc ription
The MAX1729 is designed to provide bias voltage for
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-
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,
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-
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
boost converter’s input and output voltage values, as fol-
lows:
where K is typically 8V-μs. This timing maintains discon-
tinuous conduction and sets the peak inductor current
(I
PEAK
) to:
= K
PEAK
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
I
L
t
=
K
V
t
K
V
V
ON
IN
OFF
PS
IN
≥
ECB and LCD Display Bias Supply with Accurate
Output Voltage and Temperature Compensation
6
_______________________________________________________________________________________
Pin Desc ription
Drain of the internal MOSFET Switch
LX
9
Ground
GND
10
Feedback and Mode Control Input. Connect to GND for internal feedback mode operation.
FB
5
Control Input. Drive low for more than 1.2ms to put the device into shutdown.
CTLIN
6
Bypass to GND with a 1.0μF capacitor.
OUT
7
Output of boost converter and input to LDO. Bypass to GND with a 0.068μF capacitor.
PS
8
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).
COMP
4
Reference Voltage Output. Bypass to GND with a 0.1μF capacitor.
REF
3
PIN
Temperature-Sensor Output. Bypass to GND with a 1000pF capacitor.
TC
2
Supply Input. Bypass with 0.1μF capacitor to ground. Connect to supply side of inductor (L1).
IN
1
FUNCTION
NAME
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| MAX1729EUB | ECB and LCD Display Bias Supply with Accurate Output Voltage and Temperature Compensation |
| MAX1734EUK15 | Low-Voltage, Step-Down DC-DC Converters in SOT23 |
| MAX1733EUK-T | Low-Voltage, Step-Down DC-DC Converters in SOT23 |
| MAX1734EUK18 | Low-Voltage, Step-Down DC-DC Converters in SOT23 |
| MAX1734EUK__-T | Low-Voltage, Step-Down DC-DC Converters in SOT23 |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX1729EUB | 功能描述:直流/直流開(kāi)關(guān)轉(zhuǎn)換器 ECB & LCD Display Bias Supply RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開(kāi)關(guān)頻率:1.5 MHz 輸出電壓:4.6 V 輸出電流:250 mA 輸出端數(shù)量:2 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT |
| MAX1729EUB-T | 功能描述:直流/直流開(kāi)關(guān)轉(zhuǎn)換器 ECB & LCD Display Bias Supply RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開(kāi)關(guān)頻率:1.5 MHz 輸出電壓:4.6 V 輸出電流:250 mA 輸出端數(shù)量:2 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT |
| MAX172ACNG | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC Integrated Circuits (ICs) RoHS:否 制造商:Texas Instruments 通道數(shù)量:2 結(jié)構(gòu):Sigma-Delta 轉(zhuǎn)換速率:125 SPs to 8 KSPs 分辨率:24 bit 輸入類(lèi)型:Differential 信噪比:107 dB 接口類(lèi)型:SPI 工作電源電壓:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-32 |
| MAX172ACNG+ | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 12-Bit 100ksps 5.25V- Precision ADC RoHS:否 制造商:Texas Instruments 通道數(shù)量:2 結(jié)構(gòu):Sigma-Delta 轉(zhuǎn)換速率:125 SPs to 8 KSPs 分辨率:24 bit 輸入類(lèi)型:Differential 信噪比:107 dB 接口類(lèi)型:SPI 工作電源電壓:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-32 |
| MAX172ACWG | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC RoHS:否 制造商:Texas Instruments 通道數(shù)量:2 結(jié)構(gòu):Sigma-Delta 轉(zhuǎn)換速率:125 SPs to 8 KSPs 分辨率:24 bit 輸入類(lèi)型:Differential 信噪比:107 dB 接口類(lèi)型:SPI 工作電源電壓:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-32 |
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