GENERAL DEscriptION

SGM41285 is a boost DC-DC converter with a wide input voltage range of 2.8V to 5.5V. This device can deliver a maximum of 70V output voltage and 4mA monitoring current limit. The 850kHz fixed switching frequency and PWM mode allow this device to minimize noise of output voltage. The constant PWM frequency provides easy filtering of output voltage in low noise applications.

This device integrates the fast biased avalanche photodiode (APD) current monitor limit with 1μs response time. The current limiting function with adjustable resistors protects the APD from the effects of optical power transients. The SGM41283 integrates various protection features such as soft-start, cycle-by-cycle current limit, under-voltage lockout (UVLO) and thermal shutdown.

The SGM41285 is available in a Green TQFN-3×3-16L package. It operates over an ambient temperature range of -40℃ to +125℃.

FEATURES

• 2.8V to 5.5V Input Voltage Range

• (VIN + 5V) to 70V Wide Output Voltage Range

• 850kHz Fixed Switching Frequency

• Internal 0.6Ω (TYP) 72V MOSFET

• Less than 1μA Shutdown Current

• Boost Converter Output Power:

  SGM41285A: 300mW

  SGM41285B: 200mW

• High-side Current Monitor Ratios:

  SGM41285A: 1:1

  SGM41285B: 5:1

• Accurate High-side APD Current Monitor with 1:1 and 5:1 Ratios

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

• Open-Drain Current-Limit Indicator Flag

• Constant PWM Frequency Provides Easy Filtering in Low Noise Applications

• Internal Soft-Start Function

• -40℃ to +125℃ Operating Temperature Range

• Available in a Green TQFN-3×3-16L Package

APPLICATIONS

Avalanche Photodiode Bias and Monitor

Supply for PIN Diode Bias

Supply for Low-Noise Varactor Diode Bias

FBON and GPON Modules