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| 型号： | MAX17014ETM+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 20/33页 |
| 文件大小： | 0K |
| 描述： | IC PWR SUPPLY MULT-OUTPUT 48TQFN |
| 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： | 8mA |
| 电源电压： | 8 V ~ 16.5 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 48-WFQFN 裸露焊盘 |
| 供应商设备封装： | 48-TQFN-EP（7x7） |
| 包装： | 带卷 (TR) |
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Low-Cost Multiple-Output
Power Supply for LCD TVs
On the rising edge of the internal clock, the controller
sets a flip-flop, turning on the n-channel MOSFET and
applying the input voltage across the inductor. The cur-
rent through the inductor ramps up linearly, storing
energy in its magnetic field. Once the sum of the current-
feedback signal and the slope compensation exceed the
COMP voltage, the controller resets the flip-flop and turns
off the MOSFET. Since the inductor current is continuous,
a transverse potential develops across the inductor that
turns on the diode (D1). The voltage across the inductor
then becomes the difference between the output voltage
and the input voltage. This discharge condition forces
the current through the inductor to ramp back down,
transferring the energy stored in the magnetic field to the
output capacitor and the load. The MOSFET remains off
for the rest of the clock cycle.
Step-Up Regulator Internal
p-Channel MOSFET Pass Switch
The MAX17014 includes an integrated 120m Ω high-
voltage p-channel MOSFET to allow true shutdown of
the step-up converter output (AV DD ). This switch is typi-
cally connected in series between the step-up regula-
tor’s Schottky catch diode and its output capacitors. In
addition to allowing step-up output to discharge com-
pletely when disabled, this switch also controls the
startup inrush current into the step-up regulator’s out-
put capacitors.
When EN2 is low, SUI is internally pulled up to SWI
through an internal 1k Ω resistor. Once EN2 is high and
the step-down regulator is in regulation, the MAX17014
MAX17014
starts pulling down SUI with a 30μA internal current
source. The internal p-channel MOSFET turns on and
connects the cathode of the step-up regulator Schottky
catch diode to the step-up regulator load capacitors,
when V SUI falls below the turn-on threshold of the
MOSFET. When V SUI reaches (V SWI - 5V), the step-up
regulator and the positive charge pump are enabled
and initiate a soft-start routine.
Soft-Start
The step-up regulator achieves soft-start by linearly
ramping up its internal current limit. The soft-start termi-
nates when the output reaches regulation or the full
current limit has been reached. The current limit rises
from zero to the full current limit in approximately 3ms.
The soft-start feature effectively limits the inrush current
during startup (see the Step-Up Regulator Soft-Start
(Heavy Load) waveforms in the Typical Operating
Characteristics).
Positive Charge-Pump Regulator
The positive charge-pump regulator is typically used to
generate the positive supply rail for the TFT LCD gate
driver ICs. The output voltage is set with an external
resistive voltage-divider from its output to GND with the
midpoint connected to FBP. The number of charge-
pump stages and the setting of the feedback divider
determine the output voltage of the positive charge-
pump regulator. The charge pump includes a high-side
p-channel MOSFET (P1) and a low-side n-channel
MOSFET (N1) to control the power transfer as shown in
Figure 3.
INPUT
SUPPLY
SUP
C19
OSC
P1
C21
C22
ERROR
AMPLIFIER
REF
1.25V
DRVP
C20
N1
GNDP
D5
C23
OUTPUT
POSITIVE CHARGE-PUMP REGULATOR
FBP
Figure 3. Positive Charge-Pump Regulator Block Diagram
20
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX17014EVKIT+ | 功能描述:电源管理IC开发工具 MAX17014 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 |
| MAX17015AETP+ | 功能描述:电池管理 1.2MHz High-Perf Charger RoHS:否 制造商:Texas Instruments 电池类型:Li-Ion 输出电压:5 V 输出电流:4.5 A 工作电源电压:3.9 V to 17 V 最大工作温度:+ 85 C 最小工作温度:- 40 C 封装 / 箱体:VQFN-24 封装:Reel |
| MAX17015AETP+T | 功能描述:电池管理 1.2MHz High-Perf Charger RoHS:否 制造商:Texas Instruments 电池类型:Li-Ion 输出电压:5 V 输出电流:4.5 A 工作电源电压:3.9 V to 17 V 最大工作温度:+ 85 C 最小工作温度:- 40 C 封装 / 箱体:VQFN-24 封装:Reel |
| MAX17015BETP+ | 功能描述:电池管理 1.2MHz High-Perf Charger RoHS:否 制造商:Texas Instruments 电池类型:Li-Ion 输出电压:5 V 输出电流:4.5 A 工作电源电压:3.9 V to 17 V 最大工作温度:+ 85 C 最小工作温度:- 40 C 封装 / 箱体:VQFN-24 封装:Reel |
| MAX17015BETP+T | 功能描述:电池管理 1.2MHz High-Perf Charger RoHS:否 制造商:Texas Instruments 电池类型:Li-Ion 输出电压:5 V 输出电流:4.5 A 工作电源电压:3.9 V to 17 V 最大工作温度:+ 85 C 最小工作温度:- 40 C 封装 / 箱体:VQFN-24 封装:Reel |
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