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| 型号： | MAX1678EUA+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 11/12页 |
| 文件大小： | 0K |
| 描述： | IC REG BOOST SYNC 3.3V/ADJ 8UMAX |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,500 |
| 类型： | 升压（升压） |
| 输出类型： | 两者兼有 |
| 输出数： | 1 |
| 输出电压： | 3.3V，2 V ~ 5.5 V |
| 输入电压： | 0.7 V ~ 5.5 V |
| 电流 - 输出： | 90mA |
| 同步整流器： | 是 |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-TSSOP，8-MSOP（0.118"，3.00mm 宽） |
| 包装： | 带卷 (TR) |
| 供应商设备封装： | 8-uMAX |
1-Cell to 2-Cell, Low-Noise,
High-Efficiency, Step-Up DC-DC Converter
Capacitor Selection
Choose input and output capacitors to service input
and output peak currents with acceptable voltage rip-
ple. Capacitor ESR is a major contributor to output rip-
ple (usually more than 60%). A 10μF, ceramic output
filter capacitor typically provides 50mV output ripple
when stepping up from 1.3V to 3.3V at 20mA. Low input
to output voltage differences (i.e., 2 cells to 3.3V)
require higher capacitor values (10μF to 47μF).
The input filter capacitor (C IN ) also reduces peak cur-
rents drawn from the battery and improves efficiency.
Low-ESR capacitors are recommended. Ceramic
capacitors have the lowest ESR, but low-ESR tantalums
represent a good balance between cost and perfor-
mance. Low-ESR aluminum electrolytic capacitors are
tolerable, and standard aluminum electrolytic capaci-
tors should be avoided. Capacitance and ESR variation
over temperature need to be taken into consideration
for best performance in applications with wide operat-
ing temperature ranges. Table 2 lists suggested capac-
itors and suppliers.
Minimizing Noise and Voltage Ripple
EMI and output voltage ripple can be minimized by fol-
lowing these simple design rules:
1) Place the DC-DC converter and digital circuitry on
the opposite corner of the PC board from sensitive
RF and analog input stages.
2) Use a closed-core inductor, such as toroid or
shielded bobbin, to minimize fringe magnetic fields.
5) Follow sound circuit-board layout and grounding
rules (see the PC Board Layout and Grounding sec-
tion).
PC Board Layout and Grounding
High switching frequencies and large peak currents
make PC board layout an important part of design.
Poor design can result in excessive EMI on the feed-
back paths and voltage gradients in the ground plane.
Both of these factors can result in instability or regula-
tion errors. The OUT pin must be bypassed directly to
GND, as close to the IC as possible (within 0.2 inches
or 5mm).
Place power components —such as the MAX1678,
inductor, input filter capacitor, and output filter capaci-
tor—as close together as possible. Keep their traces
short, direct, and wide ( ≥ 50 mil or 1.25mm), and place
their ground pins close together in a star-ground con-
figuration. Keep the extra copper on the board and
integrate it into ground as a pseudo-ground plane. On
multilayer boards, route the star ground using compo-
nent-side copper fill, then connect it to the internal
ground plane using vias.
Place the external voltage-feedback network very close
to the FB pin (within 0.2 inches or 5mm). Noisy traces,
such as from the LX pin, should be kept away from the
voltage-feedback network and separated from it using
grounded copper. The MAX1678 evaluation kit manual
shows an example PC board layout, which includes a
pseudo-ground plane.
3) Choose the largest inductor value that satisfies the
load requirement, to minimize peak switching cur-
rent and the resulting ripple and noise.
4) Use low-ESR input and output filter capacitors.
Table 2. Recommended Surface-Mount Capacitor Manufacturers
VALUE
(μF)
DESCRIPTION
595D-series tantalum
MANUFACTURER
Sprague
PHONE
603-224-1961
4.7 to 47
4.7 to 10
TAJ, TPS-series tantalum
X7R ceramic
AVX
TDK
AVX
803-946-0690
847-390-4373
803-946-0690
4.7 to 22
X7R ceramic
Taiyo Yuden
408-573-4150
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX1678EVKIT | 功能描述:电源管理IC开发工具 Evaluation Kit for the MAX1678 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 |
| MAX1679EUA | 功能描述:电池管理 Battery Charger Current-Limited Sply 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 |
| MAX1679EUA+ | 功能描述:电池管理 Battery Charger Current-Limited Sply 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 |
| MAX1679EUA+T | 功能描述:电池管理 Battery Charger Current-Limited Sply 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 |
| MAX1679EUA-T | 功能描述:电池管理 Battery Charger Current-Limited Sply 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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