低噪声、双输出转换器，为蜂窝电话中的PA、无线基带和逻辑电路供电
The MAX1705/MAX1706 are high-efficiency, low-noise, step-up DC-DC converters with an auxiliary linear-regulator output. These devices are intended for use in battery-powered wireless applications. They use a synchronous rectifier pulse-width-modulation (PWM) boost topology to generate 2.5V to 5.5V outputs from battery inputs, such as 1 to 3 NiCd/NiMH cells or 1 Li-Ion cell. The MAX1705 has an internal 1A n-channel MOSFET switch. The MAX1706 has a 0.5A switch. Both devices also have a built-in low-dropout linear regulator that delivers up to 200mA. With an internal synchronous rectifier, the MAX1705/MAX1706 deliver 5% better efficiency than similar non-synchronous converters. They also feature a pulse-frequency-modulation (PFM) standby mode to improve efficiency at light loads, and a 1µA shutdown mode. An efficiency-enhancing track mode reduces the step-up DC-DC converter output to 300mV above the linear-regulator output. Both devices come in a 16-pin QSOP package, which occupies the same space as an 8-pin SO. Other features include two shutdown-control inputs for push-on/push-off control, and an uncommitted comparator for use as a voltage monitor.
关键特性
| 应用
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| 语言 | 下载文件 | 备注 |
|---|---|---|
| 英文 | MAX1705-MAX1706.pdf | Rev 1; 05/2006 |
| Part Number | VIN (V) | VIN (V) | VOUT1 (V) | VOUT1 (V) | IOUT1 (A) | Output Adjust. Method | Switch Type | Power Good Signal | Synchronous Switching | ICC (mA) | Shutdown Mode Supply Current (µA) | Shutdown Mode Supply Current (µA) | DC-DC Outputs | Oper. Freq. (kHz) | Package/Pins | Budgetary Price |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| min | max | min | max | max | typ | typ | max | See Notes | ||||||||
| MAX1705 | 0.7 | 5.5 | 2.5 | 5.5 | 0.8 | Resistor | Internal | Yes | Yes | 0.1 | 1 | 20 | 1 | 400 | QSOP/16 | $3.69 @1k |
| MAX1706 | 0.4 | QSOP/16 | $2.96 @1k | |||||||||||||
| Part Number | VIN (V) | VIN (V) | VOUT1 (V) | VOUT1 (V) | IOUT1 (A) | Output Adjust. Method | Switch Type | Synchronous Switching | Power Good Signal | DC-DC Outputs | Alternate Topology | Oper. Freq. (kHz) | Package/Pins | Budgetary Price |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| min | max | min | max | max | See Notes | |||||||||
| MAX1705 | 0.7 | 5.5 | 2.5 | 5.5 | 0.8 | Resistor | Internal | Yes | Yes | 1 |
| 400 | QSOP/16 | $3.69 @1k |
| MAX1706 | 0.4 | QSOP/16 | $2.96 @1k | |||||||||||
| 型号 | 状况 | 推荐替代产品 | 封装 | 温度 | RoHS/无铅 |
|---|---|---|---|---|---|
| MAX1705EEE | 停止供货 | QSOP,；16引脚；30.9mm² | -40°C至+85°C | RoHS/无铅：否 | |
| MAX1705EEE+ | 生产中 | QSOP,；16引脚；30.9mm² | -40°C至+85°C | RoHS/无铅：无铅 | |
| MAX1705EEE+T | 生产中 | QSOP,；16引脚；30.9mm² | -40°C至+85°C | RoHS/无铅：无铅 | |
| MAX1705EEE-T | 停止供货 | MAX1705EEE+T | QSOP,；16引脚；30.9mm² | -40°C至+85°C | RoHS/无铅：否 |
