- 您现在的位置：买卖IC网 > PDF目录13148 > MAX1779EUE+ (Maxim Integrated Products)IC DC-DC CONV TRPL LCD 16-TSSOP PDF资料下载
参数资料
| 型号： | MAX1779EUE+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 14/18页 |
| 文件大小： | 0K |
| 描述： | IC DC-DC CONV TRPL LCD 16-TSSOP |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 96 |
| 应用： | 转换器，TFT，LCD |
| 输入电压： | 2.7 V ~ 5.5 V |
| 输出数： | 3 |
| 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： | 16-TSSOP（0.173"，4.40mm 宽） |
| 供应商设备封装： | 16-TSSOP |
| 包装： | 管件 |
| 产品目录页面： | 1410 (CN2011-ZH PDF) |
Low-Power Triple-Output TFT LCD DC-DC
Converter
nated by the internal switch resistance and the diode
impedance. Start with 0.1μF ceramic capacitors.
Smaller values may be used for low-current applica-
tions.
Charge-Pump Output Capacitor
Increasing the output capacitance or decreasing the
ESR reduces the output ripple voltage and the peak-to-
peak transient voltage. Use the following equation to
approximate the required capacitor value:
C PUMP ≥ [I PUMP / (125kHz ? V RIPPLE )]
Charge-Pump Input Capacitor
Use a bypass capacitor with a value equal to or greater
than the flying capacitor. Place the capacitor as close
to the IC as possible. Connect directly to PGND.
Rectifier Diode
Use Schottky diodes with a current rating equal to or
greater than 4 times the average output current, and a
voltage rating at least 1.5 times V SUPP for the positive
charge pump and V SUPN for the negative charge pump.
PC Board Layout and Grounding
Carefully printed circuit layout is extremely important to
mum load current that the LX charge pump can provide
and is limited by the following formula:
I LXPUMP = ((N + 1) ? I POS ) + (M + I NEG ) ≤ 5mA
where N is the number of stages in the positive low-
power charge pump, and M is the number of stages in
the negative charge pump. Applications requiring more
output current should not use the LX charge pump, so
they will require extra stages on both low-power charge
pumps. The output capacitor of this unregulated
charge pump needs to be stacked on top of the main
output in order to keep the main regulator stable.
Increasing the integrator capacitor may also be
required to compensate for the additional charge-pump
capacitance on the main regulator loop.
The output capacitor of this unregulated charge pump
needs to be stacked on top of the main output in order
to keep the main regulator stable. Increasing the inte-
grator capacitor may also be required to compensate
for the additional charge-pump capacitance on the
main regulator loop.
Table 1. Component Suppliers
minimize ground bounce and noise. First, place the
main boost converter output diode and output capacitor
less than 0.2in (5mm) from the LX and PGND pins with
wide traces and no vias. Then place 0.1μF ceramic
bypass capacitors near the charge-pump input pins
(SUPP and SUPN) to the PGND pin. Keep the charge-
pump circuitry as close to the IC as possible, using
wide traces and avoiding vias when possible. Locate
all feedback resistive dividers as close to their respec-
tive feedback pins as possible. The PC board should
feature separate GND and PGND areas connected at
only one point under the IC. To maximize output power
and efficiency and to minimize output power ripple volt-
age, use extra wide power ground traces and solder
the IC’s power ground pin directly to it. Avoid having
sensitive traces near the switching nodes and high-cur-
rent lines.
Refer to the MAX1779 evaluation kit for an example of
proper board layout.
Applications Information
LX Charge Pump
Some applications require multiple charge-pump
SUPPLIER
INDUCTORS
Coilcraft
Coiltronics
Sumida USA
Toko
CAPACITORS
AVX
Kemet
Sanyo
Taiyo Yuden
DIODES
Central
Semiconductor
International
Rectifier
Motorola
Nihon
Zetex
PHONE
847-639-6400
561-241-7876
847-956-0666
847-297-0070
803-946-0690
408-986-0424
619-661-6835
408-573-4150
516-435-1110
310-322-3331
602-303-5454
847-843-7500
516-543-7100
FAX
847-639-1469
561-241-9339
847-956-0702
847-699-1194
803-626-3123
408-986-1442
619-661-1055
408-573-4159
516-435-1824
310-322-3332
602-994-6430
847-843-2798
516-864-7630
stages due to low supply voltages. In order to reduce
the circuit’s size and component count, an unregulated
charge pump may be added onto the LX switching
node. The configuration shown in Figure 4 works well
for most applications. The maximum output current of
the low-power charge pumps depends on the maxi-
TRANSISTOR COUNT: 2846
Chip Information
14
______________________________________________________________________________________
相关PDF资料 |
PDF描述 |
|---|---|
| RCC43DRTH-S93 | CONN EDGECARD 86POS DIP .100 SLD |
| ECC50DCMN-S288 | CONN EDGECARD 100POS .100 EXTEND |
| VE-B63-EU | CONVERTER MOD DC/DC 24V 200W |
| SPA221M0ER | CAP ALUM 220UF 2.5V 20% SMD |
| VI-J3K-EX-F1 | CONVERTER MOD DC/DC 40V 75W |
相关代理商/技术参数 |
参数描述 |
|---|---|
| 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 |
| MAX177C/D | 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 |
| MAX177CNG | 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 |
发布紧急采购，3分钟左右您将得到回复。