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参数资料
| 型号： | MAX8739ETP+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 18/19页 |
| 文件大小： | 0K |
| 描述： | IC DC/DC CONV W/OPAMP 20TQFN-EP |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 60 |
| 应用： | 转换器，TFT，LCD |
| 输入电压： | 1.8 V ~ 5.5 V |
| 输出数： | 1 |
| 输出电压： | 1.8 V ~ 13 V |
| 工作温度： | 0°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 20-WQFN 裸露焊盘 |
| 供应商设备封装： | 20-TQFN-EP（5x5） |
| 包装： | 管件 |
TFT, LCD, DC-DC Converter with
Operational Amplifiers
PC Board Layout and Grounding
Careful PC board layout is important for proper opera-
tion. Use the following guidelines for good PC board
layout:
1) Minimize the area of high-current loops by placing
the inductor, output diode, and output capacitors
4)
5)
Place IN pin and LDO pin bypass capacitors as
close to the device as possible. The ground con-
nections of the IN and LDO bypass capacitors
should be connected directly to the AGND pin
with a wide trace.
Minimize the length and maximize the width of
near the input capacitors and near the LX and
PGND pins. The high-current input loop goes from
the positive terminal of the input capacitor to the
inductor, to the IC’s LX pin, out of PGND, and to
the input capacitor’s negative terminal. The high-
current output 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.
2) Create a power-ground island (PGND) consisting
of the input and output capacitor grounds, PGND
pin, and any charge-pump components. Connect
all these together with short, wide traces or a
small ground plane. Maximizing the width of the
the traces between the output capacitors and the
load for best transient responses.
6) Minimize the size of the LX node while keeping it
wide and short. Keep the LX node away from the
feedback node and analog ground. Use DC
traces as shield if necessary.
Refer to the MAX8739 evaluation kit for an example of
proper board layout.
Pin Configuration
TOP VIEW
power-ground traces improves efficiency and
reduces output voltage ripple and noise spikes.
Create an analog ground plane (AGND) consist-
ing of the AGND pin, all the feedback-divider
FB
COMP
16
17
10
9
NEG2
OUT2
ground connections, the operational-amplifier-
divider ground connections, the COMP and DEL
capacitor ground connections, the SUP and LDO
DEL
CTL
18
19
MAX8739
8
7
OUT1
NEG1
bypass capacitor ground connections, and the
device ’s exposed backside pad. Connect the
DRN
20
6
POS1
AGND and PGND islands by connecting the
PGND pin directly to the exposed backside pad.
Make no other connections between these sepa-
rate ground planes.
3)
Place the feedback-voltage-divider resistors as
close to the feedback pin as possible. The
divider ’s center trace should be kept short.
Placing the resistors far away causes the FB
traces to become antennas that can pick up
switching noise. Care should be taken to avoid
running any feedback trace near LX or the
switching nodes in the charge pumps.
TQFN
5mm x 5mm
Chip Information
TRANSISTOR COUNT: 4396
PROCESS: BiCMOS
18
______________________________________________________________________________________
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX8739ETP+ | 功能描述:LCD 驱动器 TFT LCD DC/DC Converter RoHS:否 制造商:Maxim Integrated 数位数量:4.5 片段数量:30 最大时钟频率:19 KHz 工作电源电压:3 V to 3.6 V 最大工作温度:+ 85 C 最小工作温度:- 20 C 封装 / 箱体:PDIP-40 封装:Tube |
| MAX8739ETP+T | 功能描述:LCD 驱动器 TFT LCD DC/DC Converter RoHS:否 制造商:Maxim Integrated 数位数量:4.5 片段数量:30 最大时钟频率:19 KHz 工作电源电压:3 V to 3.6 V 最大工作温度:+ 85 C 最小工作温度:- 20 C 封装 / 箱体:PDIP-40 封装:Tube |
| MAX8739ETP-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 |
| MAX8739EVKIT | 功能描述:电源管理IC开发工具 MAX8739 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 |
| MAX873ACPA+ | 制造商:Maxim Integrated Products 功能描述:V-REF PRECISION 2.5V 10MA 8PDIP N - Rail/Tube |
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