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| 型号： | MAX867EUA+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 10/12页 |
| 文件大小： | 0K |
| 描述： | IC REG BOOST ADJ 2.5MA 8UMAX |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 50 |
| 类型： | 升压（升压） |
| 输出类型： | 可调式 |
| 输出数： | 1 |
| 输出电压： | 2.7 V ~ 6 V |
| 输入电压： | 0.8 V ~ 6 V |
| 频率 - 开关： | 250kHz |
| 电流 - 输出： | 2.5mA |
| 同步整流器： | 无 |
| 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： | 管件 |
| 供应商设备封装： | 8-uMAX |
3.3V/5V or Adjustable-Output,
Single-Cell DC-DC Converters
Table 1. Component Suppliers
PRODUCTION
METHOD
Surface Mount
INDUCTORS
See Table 2
CAPACITORS
Matsuo 267 series
Sprague 595D series
AVX TPS series
RECTIFIERS
Motorola MBR 0530
Nihon EC15QS02L
Sanyo
Miniature
Through Hole
Sumida
RCH654-220
OS-CON series
low-ESR organic
Motorola 1N5017
semiconductor
COMPANY
AVX
Coilcraft
Matsuo
Motorola
Murata-Erie
Nihon
Sanyo
Sumida
TDK
J.W. Miller
PHONE
USA: (803) 946-0690
USA: (847) 639-6400
USA: (714) 969-2491
USA: (602) 244-5303
USA: (800) 831-9172
USA: (805) 867-2555
Japan: 81-3-3494-7411
USA: (619) 661-6835
Japan: 81-7-2070-6306
USA: (847) 956-0666
Japan: 81-3-3607-5111
USA: (847) 390-4461
USA: (310) 515-1720
FAX
(803) 626-3123
(847) 639-1469
(714) 960-6492
(602) 244-4015
(814) 238-0490
(805) 867-2698
81-3-3494-7414
(619) 661-1055
81-7-2070-1174
(847) 956-0702
81-3-3607-5144
(847) 390-4405
(310) 515-1962
Inductor Selection
An inductor value of 330μH works well in most applica-
tions, supplying loads over 10mA and allowing typical
start-up voltages of 0.8V. The inductor value is not
critical, and the MAX866/MAX867 can operate with val-
ues from 22μH to 1mH. In general, smaller inductor val-
ues supply more output current while larger values start
with lower input voltage. Several inductor suppliers and
part numbers are listed in Tables 1 and 2.
The peak inductor current should not exceed the induc-
tor’s current rating. Since the MAX866/MAX867 current
limit of 0.5A will not be reached in most applications,
the peak coil current (I PK ) is:
I PK = (V IN(max) x 4.5μs) / L
For a typical 1-cell alkaline design, V IN(max) is 1.55V,
so:
I PK = (1.55V x 4.5μs) / 330μH = 21.14mA
which is well within the ratings of most surface-mount
coils. Higher efficiency and output current are achieved
with lower inductor resistance, but unfortunately this is
inversely related to physical size. Table 2 indicates
resistance and height for each coil. Some of the small-
est coils have resistances over 10 ? , and will not pro-
vide the same output power or efficiency of a 1 ? coil.
At light loads however (below 5mA), the efficiency dif-
ferences between low- and high-resistance coils may
be only a percent or two. The Typical Operating
Characteristics graphs show efficiency and output cur-
rent plots for 1.5 ? and 2.9 ? , 330μH coils.
Capacitor Selection
A 47μF, 6V, 0.85 ? , surface-mount tantalum (SMT)
output filter capacitor typically provides 15mV output
ripple when stepping up from 0.9V to 1.4V at 10mA.
Smaller capacitors (down to 10μF with higher ESRs) are
acceptable for light loads or in applications that can
10
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相关代理商/技术参数 |
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|---|---|
| MAX867EUA+ | 功能描述:直流/直流开关转换器 3.3/5/AdjV 1-Cell DC/DC Converter 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 |
| MAX867EUA+T | 功能描述:直流/直流开关转换器 3.3/5/AdjV 1-Cell DC/DC Converter 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 |
| MAX867EUA-G063 | 制造商:Maxim Integrated Products 功能描述:- Rail/Tube |
| MAX867EUA-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 |
| MAX867EUA-TG063 | 制造商:Maxim Integrated Products 功能描述:- Tape and Reel |
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