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参数资料
| 型号： | MAX867EUA+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 7/12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
MINIMUM
OFF-TIME
V BATT
ONE-SHOT
Q
ONE-SHOT
TRIG
SHDN
F/F
LX
V OUT
3/5*
MAXIMUM
S
R
Q
N
GND
ON-TIME
ONE-SHOT
TRIG
ONE-SHOT
Q
CURRENT-LIMIT
COMPARATOR
OUT
LBO
MAX866/MAX867
ERROR COMPARATOR
N
*
*
FB**
REF
**
**
LBI
*MAX866 ONLY
**MAX867 ONLY
Figure 1. Block Diagram
LBI COMPARATOR
REFERENCE
_______________Detailed Description
Operating Principle
The MAX866/MAX867 combine a switch-mode regula-
tor, N-channel power MOSFET, precision voltage refer-
ence, and power-fail detector in a single monolithic
device. The MOSFET is a “sense-FET” type for best effi-
ciency, and has a very low gate threshold voltage to
ensure start-up with low battery voltages (0.8V typ).
PFM Control Scheme
The MAX866/MAX867 control scheme (Figure 1) com-
bines low-voltage efficiency (80% typ) with low battery
drain (100μA typ). There is no oscillator; switching is
accomplished by a pair of one shots that set a maxi-
mum LX on-time (4.5μs typ) and a minimum LX off-time
(1μs). LX on-time will be terminated early if the inductor
current reaches 0.5A before 4.5μs elapses. With the
standard application circuit (Figure 2a), LX current is
typically less than 50mA, so LX on-time is normally not
terminated by the 0.5A limit and lasts the complete
4.5μs. The LX on-resistance is typically 1 ? to minimize
switch losses. The MAX866/MAX867 switching frequen-
cy depends on load, input voltage, and inductor value,
and it can range up to 250kHz with typical component
values.
_______________________________________________________________________________________
7
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相关代理商/技术参数 |
参数描述 |
|---|---|
| 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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