Maxim MAX15061 80V 300mW升压电源转换方案

Maxim 公司的MAX15061 是80V 300mW升压电源转换器和电流监视器,包括有恒定频率(400kHz )PWM升压转换器和内部开关,具有高速限流的高侧电流监视器.器件输入电压从2.7V 到11V,输出电压高达76V, 监视功率高达300mW.主要用于雪崩光电二极管偏压和监视, PIN二极管偏压电源,低噪音变容二极管偏压,FBON和GPON模块和LCD显示器.本文介绍MAX15061主要特性, 功能方框图, 典型工作电路和RC滤波器以及VIN = 5.5V 到11V和2.7V 到5.5V的MAX15061典型工作电路.

80V, 300mW Boost Converter and Current Monitor for APD Bias Applications

The MAX15061 consists of a constant-frequency pulsewidth modulating (PWM) step-up DC-DC converter with an internal switch and a high-side current monitor with high-speed adjustable current limiting. This device can generate output voltages up to 76V and provides current monitoring up to 4mA (up to 300mW). The MAX15061 can be used for a wide variety of applications such as avalanche photodiode biasing, PIN biasing, or varactor biasing, and LCD displays. The MAX15061 operates from 2.7V to 11V.

The constant-frequency (400kHz), current-mode PWM architecture provides low-noise output voltage that is easy to filter. A high-voltage, internal power switch allows this device to boost output voltages up to 76V.

Internal soft-start circuitry limits the input current when the boost converter starts. The MAX15061 features a shutdown mode to save power.

The MAX15061 includes a current monitor with more than three decades of dynamic range and monitors current ranging from 500nA to 2mA with high accuracy.

Resistor-adjustable current limiting protects the APD from optical power transients. A clamp diode protects the monitor’s output from overvoltage conditions. Other protection features include cycle-by-cycle current limiting of the boost converter switch, undervoltage lockout, and thermal shutdown if the die temperature reaches +160℃.

The MAX15061 is available in a thermally enhanced 4mm x 4mm, 16-pin TQFN package and operates over the -40℃ to +125℃ automotive temperature range.

MAX15061主要特性:

_ Input Voltage Range

+2.7V to +5.5V (Using Internal Charge Pump) or +5.5V to +11V

_ Wide Output-Voltage Range from (VIN + 1V) to 76V

_ Internal 1 ohm (typ) 80V Switch

_ 300mW Boost Converter Output Power

_ Accurate ±10% (500nA to 1mA) and ±3.5% (1mA to 4mA) High-Side Current Monitor

_ Resistor-Adjustable Ultra-Fast APD Current Limit (1μs Response Time)

_ Open-Drain Current-Limit Indicator Flag

_ 400kHz Fixed Switching Frequency

_ Constant PWM Frequency Provides Easy Filtering in Low-Noise Applications

_ Internal Soft-Start

_ 2μA (max) Shutdown Current

_ -40℃ to +125℃ Temperature Range

_ Small Thermally Enhanced, 4mm x 4mm, 16-Pin TQFN Package

MAX15061主要应用:

Avalanche Photodiode Biasing and Monitoring

PIN Diode Bias Supplies

Low-Noise Varactor Diode Bias Supplies

FBON Modules

GPON Modules

LCD Displays

图1.MAX15061功能方框图

图2.MAX15061典型工作电路和RC滤波器

图3. VIN = 2.7V 到5.5V的MAX15061典型工作电路

图4. VIN = 5.5V 到11V的MAX15061典型工作电路