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主要特征
应用/用途
Parametric specs for Multifunction PMICs
VIN (V) (min) | 0.7 |
VIN (V) (max) | 5.5 |
# Step-Up Outputs | 2 |
VOUT (V) (min) | 2.5 |
VOUT (V) (max) | 5.5 |
Package/Pins | QSOP/16 |
Budgetary Price (See Notes) | 3.63 |
缩小
简化框图
Technical Docs
数据资料 | 紧凑的、高效率、双输出、升压型和LCD偏置DC-DC转换器 | Dec 24, 2001 |
支持和培训
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参量
Parametric specs for Multifunction PMICs
VIN (V) (min) | 0.7 |
VIN (V) (max) | 5.5 |
# Step-Up Outputs | 2 |
VOUT (V) (min) | 2.5 |
VOUT (V) (max) | 5.5 |
Package/Pins | QSOP/16 |
Budgetary Price (See Notes) | 3.63 |
主要特征
- No External FETs Required
- Main Output
- Up to 350mA for Logic Supply
- Fixed 3.3V or Adjustable (2.5V to 5.5V)
- Synchronous Rectification for High Efficiency (up to 95%)
- 300kHz (200kHz to 400kHz Synchronizable)
- Fixed-Frequency PWM Operation
- Secondary Output
- Up to +28V or -28V for LCD Bias
- Programmable Current Limit
- 0.7V to 5.5V Input Voltage Range
- 20µA Quiescent Current
- 1µA Shutdown Current
- Low-Battery Comparator
- Small 16-Pin QSOP Package
应用/用途
- 手持式终端
- PDA
- 便携式仪表
- 便携电话
描述
The MAX1677 is a compact, high-efficiency, dual-output boost converter for portable devices needing two regulated supplies, typically for logic and liquid crystal displays (LCDs). Operation with inputs as low as 0.7V allows the MAX1677 to accept 1, 2, or 3-cell alkaline, NiCd, or NiMH batteries as well as 1-cell lithium-ion batteries. The device requires no external FETs and can maintain regulation while consuming only 20µA, making it ideal for hand-held pen-input and PDA devices operating with low-current "sleep" states.
The MAX1677's primary regulator supplies up to 350mA at either a factory-preset 3.3V or an adjustable 2.5V to 5.5V output. On-chip synchronous rectification provides efficiencies up to 95%. 300kHz (or externally clocked) pulse-width-modulation (PWM) operation is particularly suitable for applications needing low noise, such as those with wireless features. The primary converter also features pin-selectable pulse-frequency-modulation (PFM) operation that consumes only 20µA. A 1µA shutdown state also minimizes battery drain.
The MAX1677's secondary step-up converter supplies up to +28V or -28V for LCD bias, varactor tuning, or other high-voltage, low-current functions. Other MAX1677 features include precision reference, logic control inputs for both regulators, and an uncommitted comparator for low-battery detection or a reset function. The MAX1677 is supplied in Maxim's compact 16-pin QSOP package, which occupies no more space than a standard SO-8.
The MAX1677's primary regulator supplies up to 350mA at either a factory-preset 3.3V or an adjustable 2.5V to 5.5V output. On-chip synchronous rectification provides efficiencies up to 95%. 300kHz (or externally clocked) pulse-width-modulation (PWM) operation is particularly suitable for applications needing low noise, such as those with wireless features. The primary converter also features pin-selectable pulse-frequency-modulation (PFM) operation that consumes only 20µA. A 1µA shutdown state also minimizes battery drain.
The MAX1677's secondary step-up converter supplies up to +28V or -28V for LCD bias, varactor tuning, or other high-voltage, low-current functions. Other MAX1677 features include precision reference, logic control inputs for both regulators, and an uncommitted comparator for low-battery detection or a reset function. The MAX1677 is supplied in Maxim's compact 16-pin QSOP package, which occupies no more space than a standard SO-8.
Technical Docs
数据资料 | 紧凑的、高效率、双输出、升压型和LCD偏置DC-DC转换器 | Dec 24, 2001 |
支持和培训
采样:
选择上方“样片”按钮将重定向至第三方ADI样片网站。登录后,所选部件将转移到您在此网站上的购物车。如果您之前从未使用过此网站,请创建一个新帐户。有关此样片网站的任何问题,请联系SampleSupport@analog.com。