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主要特征
应用/用途
Parametric specs for Step-Down Switching Regulators
| VIN (V) (min) | 5.2 |
| VIN (V) (max) | 11 |
| VOUT1 (V) (min) | 5 |
| VOUT1 (V) (max) | 5 |
| IOUT1 (A) (max) | 0.45 |
| Switch Type | Internal |
| Preset VOUT (V) | 5 |
| Output Adjust. Method | Preset Resistor |
| # DC-DC Outputs | 1 |
| Switching Frequency (kHz) | 210 |
| Package/Pins | SOIC (N)/8 |
| Budgetary Price (See Notes) | 2.66 |
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参量
Parametric specs for Step-Down Switching Regulators
| VIN (V) (min) | 5.2 |
| VIN (V) (max) | 11 |
| VOUT1 (V) (min) | 5 |
| VOUT1 (V) (max) | 5 |
| IOUT1 (A) (max) | 0.45 |
| Switch Type | Internal |
| Preset VOUT (V) | 5 |
| Output Adjust. Method | Preset Resistor |
| # DC-DC Outputs | 1 |
| Switching Frequency (kHz) | 210 |
| Package/Pins | SOIC (N)/8 |
| Budgetary Price (See Notes) | 2.66 |
主要特征
- 750mA Load Currents (MAX738A/MAX744A)
- High-Frequency, Current-Mode PWM
- 159kHz to 212.5kHz Guaranteed Oscillator Frequency Limits (MAX744A)
- 85% to 96% Efficiencies
- 1.7mA Quiescent Current
- 6µA Shutdown Supply Current
- Single Preselected Inductor Value, No Component Design Required
- Overcurrent, Soft-Start, and Undervoltage Lockout Protection
- Cycle-by-Cycle Current Limiting
- 8-Pin DIP/SO Packages (MAX730A)
应用/用途
- 蜂窝电话
- 计算机外设
- 分布式供电系统
- 个人通信装置
- 便携式仪表
描述
The MAX730A/MAX738A/MAX744A are 5V-output CMOS, step-down switching regulators. The MAX738A/MAX744A accept inputs from 6V to 16V and deliver 750mA. The MAX744A guarantees 500mA load capability for inputs above 6V and has tighter oscillator frequency limits for low-noise (radio) applications. The MAX730A accepts inputs between 5.2V and 11V and delivers 450mA for inputs above 6V. Typical efficiencies are 85% to 96%. Quiescent supply current is 1.7mA and only 6µA in shutdown.
Pulse-width modulation (PWM) current-mode control provides precise output regulation and excellent transient responses. Output voltage accuracy is guaranteed to be ±5% over line, load, and temperature variations. Fixed-frequency switching allows easy filtering of output ripple and noise, as well as the use of small external components. These regulators require only a single inductor value to work in most applications, so no inductor design is necessary.
The MAX730A/MAX738A/MAX744A also feature cycle-by-cycle current limiting, overcurrent limiting, undervoltage lockout, and programmable soft-start protection.
Pulse-width modulation (PWM) current-mode control provides precise output regulation and excellent transient responses. Output voltage accuracy is guaranteed to be ±5% over line, load, and temperature variations. Fixed-frequency switching allows easy filtering of output ripple and noise, as well as the use of small external components. These regulators require only a single inductor value to work in most applications, so no inductor design is necessary.
The MAX730A/MAX738A/MAX744A also feature cycle-by-cycle current limiting, overcurrent limiting, undervoltage lockout, and programmable soft-start protection.
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