- 您现在的位置：买卖IC网 > PDF目录1839 > MAX1747EUP+ (Maxim Integrated Products)IC CHRG-PUMP TRPL TFTLCD 20TSSOP PDF资料下载
参数资料
| 型号： | MAX1747EUP+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 12/13页 |
| 文件大小： | 0K |
| 描述： | IC CHRG-PUMP TRPL TFTLCD 20TSSOP |
| 标准包装： | 74 |
| 应用： | 转换器，TFT，LCD |
| 输入电压： | 2.7 V ~ 4.5 V |
| 输出数： | 3 |
| 输出电压： | 可调 |
| 工作温度： | 0°C ~ 85°C |
| 安装类型： | * |
| 封装/外壳： | * |
| 供应商设备封装： | * |
| 包装： | * |
Triple Charge-Pump TFT LCD
DC-DC Converter
C X ≤
150 Hz × C OUT
Efficiency ? V POS / [V SUPP ? (N+1)] for the
positive low-power charge pump
where N is the number of charge-pump stages.
Output Voltage Selection
Adjust the main output voltage by connecting a volt-
age-divider from the output (V OUT ) to FB and GND (see
Typical Operating Circuit ). Adjust the negative low-
power output voltage by connecting a voltage-divider
from the output (V NEG ) to FBN to REF. Adjust the posi-
tive low-power output voltage by connecting a voltage-
divider from the output (V POS ) to FBP to GND. Select
R2, R4, and R6 in the 10k ? to 200k ? range. Calculate
the remaining resistors with the following equations:
R1 = R2 [(V OUT / V REF ) – 1]
R3 = R4 [(V POS / V REF ) – 1]
R5 = R6 |V NEG / V REF |
where V REF = 1.25V. V OUT may range from 4.5V to
5.5V, V POS may range from V SUPP to +35V, and V NEG
may range from 0 to -35V.
Flying Capacitors
Increasing the flying capacitor ’ s value increases the
output-current capability. Above a certain point, larger
capacitor values lower the secondary pole formed by
the transfer capacitor and switch R ON , which destabi-
lizes the output. For the main charge pump, use a
ceramic capacitor based on the following equation:
0.47 μ F × MHz
f OSC
For the low-power charge pumps, a 0.1μF ceramic
capacitor works well in most applications. Smaller val-
ues may be used for lower current applications.
Component suppliers are listed in Table 1.
For the low-power charge pumps, the output capacitor
should be anywhere from 5-times to 20-times larger
than the flying capacitor, depending on the ripple toler-
ance. Increasing the output capacitance or decreasing
the ESR reduces the output ripple voltage and the
peak-to-peak transient voltage.
Input Capacitors
Using an input capacitor with a value equal to or
greater than the output capacitor is recommended.
Place the capacitor as close to the IC as possible. If the
source impedance or inductance of the input supply is
large, additional input bypassing may be required.
For the low-power charge-pump inputs (SUPN and
SUPP), using bypass capacitors with values equal to or
greater than the flying capacitors is recommended.
Place these capacitors as close to the supply voltage
inputs as possible.
Rectifier Diodes
Use Schottky diodes with a current rating greater than
4 times the average output current, and with a voltage
rating of 1.5 times V SUPP for the positive charge pump
and V SUPN for the negative charge pump.
Integrator Capacitor
The MAX1747 contains an internal current integrator
that improves the DC load regulation but increases the
peak-to-peak transient voltage (see Load-Transient
Waveform in the Typical Operating Characteristics ).
Connect a ceramic capacitor between INTG and GND
based on the following equation:
C INTG ≥
f OSC
Table 1. Component Suppliers
Output Capacitors
For the main charge pump, use a ceramic capacitor
based on the following equation:
SUPPLIER
CAPACITORS
AVX
PHONE
803-946-0690
FAX
803-626-3123
? ? 20
? ? ? M Hz
× C X × f OSC ? AND ?
? ?
? ? ?
C OUT ≥ ? ?
? ? f OSC
? ? 2 μ F × M Hz ? ?
Kemet
Sanyo
Taiyo Yuden
408-986-0424
619-661-6835
408-573-4150
408-986-1442
619-661-1055
408-573-4159
For low-frequency applications (close to 200kHz),
DIODES
selection of the output capacitor is limited solely by the
switching frequency. However, for high-frequency
applications (close to 2MHz), selection of the output
capacitor is limited by the secondary pole formed by
the flying capacitor and switch on-resistance.
Central
International
Rectifier
Motorola
Nihon
516-435-1110
310-322-3331
602-303-5454
847-843-7500
516-435-1824
310-322-3332
602-994-6430
847-843-2798
12
______________________________________________________________________________________
相关PDF资料 |
PDF描述 |
|---|---|
| MAX17480GTL+T | IC CTRLR SERIAL VID 40-TQFN |
| MAX17482GTL+ | IC CTLR PWM DUAL IMVP-6.5 40TQFN |
| MAX1748EUE+T | IC DC-DC CONV TRPL LCD 16-TSSOP |
| MAX17497AATE+T | IC OFF-LINE CONVERTER 16TQFN |
| MAX17498AATE+T | IC OFF-LINE CONVERTER 16TQFN |
相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX1747EUP+ | 功能描述:电荷泵 Triple Charge-Pump TFT LCD DC/DC Conv RoHS:否 制造商:Maxim Integrated 功能:Inverting, Step Up 输出电压:- 1.5 V to - 5.5 V, 3 V to 11 V 输出电流:100 mA 电源电流:1 mA 最大工作温度:+ 70 C 封装 / 箱体:SOIC-8 Narrow 封装:Tube |
| MAX1747EUP+T | 功能描述:电荷泵 Triple Charge-Pump TFT LCD DC/DC Conv RoHS:否 制造商:Maxim Integrated 功能:Inverting, Step Up 输出电压:- 1.5 V to - 5.5 V, 3 V to 11 V 输出电流:100 mA 电源电流:1 mA 最大工作温度:+ 70 C 封装 / 箱体:SOIC-8 Narrow 封装:Tube |
| MAX1747EUP-T | 功能描述:电荷泵 RoHS:否 制造商:Maxim Integrated 功能:Inverting, Step Up 输出电压:- 1.5 V to - 5.5 V, 3 V to 11 V 输出电流:100 mA 电源电流:1 mA 最大工作温度:+ 70 C 封装 / 箱体:SOIC-8 Narrow 封装:Tube |
| MAX1747EVKIT | 功能描述:电源管理IC开发工具 MAX1747 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 |
| MAX17480EVKIT+ | 功能描述:电源管理IC开发工具 MAX17480 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 |
发布紧急采购，3分钟左右您将得到回复。