- 您现在的位置：买卖IC网 > PDF目录16785 > MAX17075ETG+ (Maxim Integrated Products)IC DC-DC CONV W/CHRG PUMP 24TQFN PDF资料下载
参数资料
| 型号： | MAX17075ETG+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 20/23页 |
| 文件大小： | 0K |
| 描述： | IC DC-DC CONV W/CHRG PUMP 24TQFN |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 75 |
| 应用： | LCD 电视机/监控器 |
| 电流 - 电源： | 4mA |
| 电源电压： | 2.3 V ~ 5.5 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 24-WFQFN 裸露焊盘 |
| 供应商设备封装： | 24-TQFN-EP（4x4） |
| 包装： | 管件 |
MAX17075
Boost Regulator with Integrated Charge Pumps,
Switch Control, and High-Current Op Amp
To further optimize transient response, vary R COMP in
20% steps and C COMP in 50% steps while observing
transient-response waveforms.
Charge-Pump Regulators
Selecting the Number of Charge-Pump Stages
For highest efficiency, always choose the lowest num-
Charge-Pump Output Capacitor
Increasing the output capacitance or decreasing the
ESR reduces the output ripple voltage and the peak-to-
peak transient voltage. With ceramic capacitors, the
output voltage ripple is dominated by the capacitance
value. Use the following equation to approximate the
required capacitor value:
2 f OSC RIPPLE _ CP
ber of charge-pump stages that meet the output
requirement.
The number of positive charge-pump stages is given by:
C OUT _ CP ≥
I LOAD _ CP
V
η POS = GON DROPOUT AVDD
? V GOFF + V DROPOUT
R 15 = R 16 × ? GON ? 1 ?
R 7 = R 6 × FBN GOFF
R 11 = R 12 × ? INXAO ? 1 ?
V + V ? V
V SUP ? 2 × V D
where n POS is the number of positive charge-pump
stages, V GON is the output of the positive charge-pump
regulator, V SUP is the supply voltage of the charge-
pump regulators, V D is the forward voltage drop of the
charge-pump diode, and V DROPOUT is the dropout
margin for the regulator. Use V DROPOUT = 600mV.
The number of negative charge-pump stages is given by:
η NEG =
V SUP ? 2 × V D
where n NEG is the number of negative charge-pump
stages and V GOFF is the output of the negative charge-
pump regulator.
The above equations are derived based on the
assumption that the first stage of the positive charge
pump is connected to V AVDD and the first stage of the
negative charge pump is connected to ground.
Flying Capacitors
Increasing the flying capacitor C X (connected to DRVN
and DRVP) value lowers the effective source impedance
and increases the output current capability. Increasing
the capacitance indefinitely has a negligible effect on
output current capability because the internal switch
resistance and the diode impedance place a lower limit
on the source impedance. A 0.1μF ceramic capacitor
works well in most low-current applications. The flying
capacitor’s voltage rating must exceed the following:
V CX > n × V SUP
where n is the stage number in which the flying capaci-
tor appears.
20
where C OUT _ CP is the output capacitor of the charge
pump, I LOAD _ CP is the load current of the charge
pump, and V RIPPLE_CP is the peak-to-peak value of the
output ripple, and f OSC is the switching frequency.
Output Voltage Selection
Adjust the positive charge-pump regulator’s output volt-
age by connecting a resistive voltage-divider from the
REG P output to GND with the center tap connected to
FBP (Figure 1). Select the lower resistor of divider R16
in the 10k ? to 30k ? range. Calculate the upper resistor
R15 with the following equation:
? V ?
? V FBP ?
where V FBP = 1.25V (typical).
Adjust the negative charge-pump regulator’s output
voltage by connecting a resistive voltage-divider from
V GOFF to REF with the center tap connected to FBN
(Figure 1). Select R6 in the 35k ? to 68k ? range.
Calculate R7 with the following equation:
V ? V
V REF ? V FBN
where V FBN = 250mV, V REF = 1.25V. Note that REF can
only source up to 50μA, using a resistor less than 35k ?
for R6 results in higher bias current than REF can supply.
Set the XAO Threshold Voltage
XAO threshold voltage can be adjusted by connecting
a resistive voltage-divider from input V IN to GND with
the center tap connected to RSTIN (see Figure 1).
Select R12 in the 10k ? to 50k ? range. Calculate R11
with the following equation:
? V ?
? V RSTIN ?
where V RSTIN , the RSTIN threshold set point, is 1.25V.
V INXAO is the desired XAO threshold voltage. Place
R11 and R12 close to the IC.
Maxim Integrated
相关PDF资料 |
PDF描述 |
|---|---|
| RNF-100-3/32-GY-SP | HEAT SHRINK TUBING |
| RNF-100-3/32-VT-STK | HEAT SHRINK TUBING |
| MC1403BP1 | IC VREF SERIES PREC 2.5V 8-PDIP |
| MAX9737EVKIT+ | KIT EVAL FOR MAX9737 |
| H3BBS-2606G | IDC CABLE - HSR26S/AE26G/HSR26S |
相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX17075ETG+ | 功能描述:直流/直流开关转换器 Boost-Regulator w/Charge Pump 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 |
| MAX17075ETG+T | 功能描述:直流/直流开关转换器 Boost-Regulator w/Charge Pump 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 |
| MAX17075EVKIT+ | 功能描述:电源管理IC开发工具 MAX17075 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 |
| MAX17077AETM+ | 功能描述:低压差稳压器 - LDO Hybrid 500mA RoHS:否 制造商:Texas Instruments 最大输入电压:36 V 输出电压:1.4 V to 20.5 V 回动电压（最大值）:307 mV 输出电流:1 A 负载调节:0.3 % 输出端数量: 输出类型:Fixed 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-20 |
| MAX17077AETM+T | 功能描述:低压差稳压器 - LDO Hybrid 500mA RoHS:否 制造商:Texas Instruments 最大输入电压:36 V 输出电压:1.4 V to 20.5 V 回动电压（最大值）:307 mV 输出电流:1 A 负载调节:0.3 % 输出端数量: 输出类型:Fixed 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-20 |
发布紧急采购，3分钟左右您将得到回复。