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| 型号： | MAX17014ETM+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 30/33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： | 43 |
| 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： | 托盘 |
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Low-Cost Multiple-Output
Power Supply for LCD TVs
Flying Capacitors
Increasing the flying capacitors (connected to DRVN
and DRVP) value lowers the effective source impedance
PCB Layout and Grounding
Careful PCB layout is important for proper operation.
Use the following guidelines for good PCB layout:
C OUT _ CP ≥
R 17 = R 16 × ? GON ? 1 ?
R 1 = R 2 × FBN GOFF
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.
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:
I LOAD _ CP
2 f OSC V RIPPLE _ CP
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.
Output Voltage Selection
Adjust the positive charge-pump regulator’s output volt-
age by connecting a resistive voltage-divider from the
SRC output to GND with the center tap connected to
FBP (Figure 1). Select the lower resistor of divider R17
in the 10k Ω to 30k Ω range. Calculate the upper resis-
tor, R16, with the following equation:
? V ?
? V FBP ?
where V FBP = 1.25V (typ).
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 R2 in the 20k Ω to 50k Ω range.
Calculate R1 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 20k Ω
for R1 results in higher bias current than REF can supply.
?
?
Minimize the area of respective high-current loops
by placing each DC-DC converter ’s inductor,
diode, and output capacitors near its input capaci-
tors and its LX_ and GND_ pins. For the step-down
regulator, the high-current input loop goes from the
positive terminal of the input capacitor to the IC’s IN
pin, out of LX2, to the inductor, to the positive termi-
nals of the output capacitors, reconnecting the out-
put capacitor and input capacitor ground terminals.
The high-current output loop is from the inductor to
the positive terminals of the output capacitors, to
the negative terminals of the output capacitors, and
to the Schottky diode (D2). For the step-up regula-
tor, the high-current input loop goes from the posi-
tive terminal of the input capacitor to the inductor,
to the IC’s LX1 pin, out of GND1, and to the input
capacitor’s negative terminal. The high-current out-
put loop is from the positive terminal of the input
capacitor to the inductor, to the output diode (D1),
to the positive terminal of the output capacitors,
reconnecting between the output capacitor and
input capacitor ground terminals. Connect these
loop components with short, wide connections.
Avoid using vias in the high-current paths. If vias
are unavoidable, use many vias in parallel to
reduce resistance and inductance.
Create a power ground island for the step-down reg-
ulator, consisting of the input and output capacitor
grounds and the diode ground. Connect all these
together with short, wide traces or a small ground
plane. Similarly, create a power ground island
(GND1) for the step-up regulator, consisting of the
input and output capacitor grounds and the GND1
pin. Create a power ground island (CPGND) for the
positive and negative charge pumps, consisting of
SUP and output (SRC, V GOFF ) capacitor grounds,
and negative charge-pump diode ground. Connect
CPGND ground plane to GND1 ground plane
together with wide traces. Maximizing the width of
the power ground traces improves efficiency and
reduces output voltage ripple and noise spikes.
Create an analog ground plane (GND) consisting of
the GND pin, all the feedback divider ground con-
nections, the COMP and DEL capacitor ground
connections, and the device’s exposed backside
pad. Connect GND1 and GND islands by connect-
ing the two ground pins directly to the exposed
backside pad. Make no other connections between
the GND1 and GND ground planes.
30
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX17014ETM+ | 功能描述:其他电源管理 Power Supply for LCD TVs RoHS:否 制造商:Texas Instruments 输出电压范围: 输出电流:4 mA 输入电压范围:3 V to 3.6 V 输入电流: 功率耗散: 工作温度范围:- 40 C to + 110 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-48 封装:Reel |
| MAX17014ETM+T | 功能描述:显示驱动器和控制器 Power Supply for LCD TVs RoHS:否 制造商:Panasonic Electronic Components 工作电源电压:2.7 V to 5.5 V 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:QFN-44 封装:Reel |
| 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 |
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