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主要特征
应用/用途
Parametric specs for Step-Up Switching Regulators
| VIN (V) (min) | 0.7 |
| VIN (V) (max) | 5.5 |
| VOUT1 (V) (min) | 2 |
| VOUT1 (V) (max) | 5.5 |
| IOUT1 (A) (max) | 0.09 |
| Switch Type | Internal |
| Preset VOUT (V) | 3 |
| Output Adjust. Method | Preset Resistor |
| Power Good Signal | Yes |
| Synchronous Switching? | Yes |
| ICC (mA) (typ) | 0.037 |
| Shutdown Mode Supply Current (µA) (typ) | 0.1 |
| Shutdown Mode Supply Current (µA) (max) | 1 |
| # DC-DC Outputs | 1 |
| Package/Pins | UMAX/8 |
| Budgetary Price (See Notes) | 2.03 |
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Technical Docs
| 数据资料 | 1节至2节电池、低噪声、高效率、升压型DC-DC转换器 | Jul 01, 1998 |
参量
Parametric specs for Step-Up Switching Regulators
| VIN (V) (min) | 0.7 |
| VIN (V) (max) | 5.5 |
| VOUT1 (V) (min) | 2 |
| VOUT1 (V) (max) | 5.5 |
| IOUT1 (A) (max) | 0.09 |
| Switch Type | Internal |
| Preset VOUT (V) | 3 |
| Output Adjust. Method | Preset Resistor |
| Power Good Signal | Yes |
| Synchronous Switching? | Yes |
| ICC (mA) (typ) | 0.037 |
| Shutdown Mode Supply Current (µA) (typ) | 0.1 |
| Shutdown Mode Supply Current (µA) (max) | 1 |
| # DC-DC Outputs | 1 |
| Package/Pins | UMAX/8 |
| Budgetary Price (See Notes) | 2.03 |
主要特征
- 0.87V Guaranteed Start-Up
- Up to 90% Efficiency
- Built-In Synchronous Rectifier (no external diode)
- Ultra-Small µMAX Package, 1.1mm High
- 37µA Quiescent Current (85µA from 1.5V battery)
- 2µA Logic-Controlled Shutdown
- Power-Fail Detector
- Dual Mode™ Output: Fixed 3.3V
- Dual Mode Adjustable 2V to 5.5V
- 45mA Output Current at 3.3V for 1-Cell Input
- 90mA Output Current at 3.3V for 2-Cell Input
- Inductor-Damping Switch Suppresses EMI
应用/用途
- 寻呼机
- 个人医疗监视器
- 指针设备
- 远端控制
- 单节电池供电设备
描述
The MAX1678 is a high-efficiency, low-voltage, synchronous-rectified, step-up DC-DC converter intended for use in devices powered by 1 to 3-cell alkaline, NiMH, or NiCd batteries or a 1-cell lithium battery. It guarantees a 0.87V start-up voltage and features a low 37µA quiescent supply current.
The device includes a 1Ω, N-channel MOSFET power switch, a synchronous rectifier that acts as the catch diode, a reference, pulse-frequency-modulation (PFM) control circuitry, and circuitry to reduce inductor ringing-all in an ultra-small, 1.1mm-high µMAX® package.
The output voltage is preset to 3.3V or can be adjusted from +2V to +5.5V using only two resistors. Efficiencies up to 90% are achieved for loads up to 50mA. The device also features an independent undervoltage comparator (PFI/PFO) and a logic-controlled 2µA shutdown mode.
The device includes a 1Ω, N-channel MOSFET power switch, a synchronous rectifier that acts as the catch diode, a reference, pulse-frequency-modulation (PFM) control circuitry, and circuitry to reduce inductor ringing-all in an ultra-small, 1.1mm-high µMAX® package.
The output voltage is preset to 3.3V or can be adjusted from +2V to +5.5V using only two resistors. Efficiencies up to 90% are achieved for loads up to 50mA. The device also features an independent undervoltage comparator (PFI/PFO) and a logic-controlled 2µA shutdown mode.
Technical Docs
| 数据资料 | 1节至2节电池、低噪声、高效率、升压型DC-DC转换器 | Jul 01, 1998 |
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