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| 型号： | MAX17075ETG+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 15/23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： | 2,500 |
| 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： | 带卷 (TR) |
MAX17075
Boost Regulator with Integrated Charge Pumps,
Switch Control, and High-Current Op Amp
Negative Charge-Pump Regulator
The negative charge-pump regulator is typically used to
generate the negative supply rail for the TFT LCD gate
driver ICs. The output voltage is set with an external
resistive voltage-divider from its output to REF with the
midpoint connected to FBN. The number of charge-
pump stages and the setting of the feedback divider
determine the output of the negative charge-pump regu-
lator. The charge-pump controller includes a high-side p-
channel MOSFET (P2) and a low-side n-channel MOSFET
(N2) to control the power transfer as shown in Figure 5.
The error amplifier compares the feedback signal (FBN)
with a 250mV internal reference. If the feedback signal
is above the reference, the charge-pump regulator
turns on N2 and turns off P2 when the rising edge of the
oscillator clock arrives, level shifting C11. This connects
C11 in parallel with reservoir capacitor C10. If the volt-
age across C10 minus a diode drop (V C10 - V DIODE ) is
higher than the level-shifted flying capacitor voltage
(-V C11 ), charge flows from C10 to C11 until diode D4-2
MAX17075
OSC
turns off. The falling edge of the oscillator clock turns
off N2 and turns on P2, allowing V SUP to charge up fly-
ing capacitor C11 through diode D4-1. If the feedback
signal is below the reference when the rising edge of
the oscillator comes, the regulator ignores this clock
edge and keeps P2 on and N2 off.
The MAX17075 also monitors the FBN voltage for
undervoltage conditions. If the V FBN is continuously
below 80% of the nominal regulation voltage (V REF -
V FBN ) for approximately 50ms, the MAX17075 sets a
fault latch, shutting down all outputs except REF. Once
the fault condition is removed, cycle the input voltage
(below the UVLO falling threshold) to clear the fault
latch and reactivate the device.
Operational Amplifiers
The MAX17075 has one operational amplifier. The oper-
ational amplifier is typically used to drive the LCD back-
plane (VCOM) or the gamma-correction divider string. It
features ±500mA output short-circuit current, 45V/μs
slew rate, and 20MHz, 3dB bandwidth.
INPUT
SUPPLY
SUP
P2
REF
ERROR
DRVN
C11
D4-1
0.25V
AMPLIFIER
N2
D4-2
R7
C10
GOFF
NEGATIVE CHARGE-PUMP REGULATOR
FBN
R6
REF
Figure 5. Negative Charge-Pump Regulator Block Diagram
Maxim Integrated
15
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相关代理商/技术参数 |
参数描述 |
|---|---|
| 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 |
| MAX17077AETM+W | 制造商:Maxim Integrated Products 功能描述:INTERNAL-SWITCH BOOST REGULATOR - Rail/Tube |
| MAX17077ETM+ | 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 |
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