300mW Boost Converter and Current Monitor - Maxim Integrated Products
Description
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DataSheet.
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19-4299; Rev 2; 6/09
KIT ATION EVALU E L B AVAILA
80V, 300mW Boost Converter and Current Monitor for APD Bias Applications
General Description
The MAX15031 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 MAX15031 can be used for a wide variety of applications such as avalanche photodiode biasing, PIN biasing, or varactor biasing, and LCD displays.
The MAX15031 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 MAX15031 features a shutdown mode to save power.
The MAX15031 includes a current monitor with more than three decades of dynamic range and monitors current ranging from 500nA to 4mA 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°C.
The MAX15031 is available in a thermally enhanced 4mm x 4mm, 16-pin TQFN package and operates over the -40°C to +125°C automotive temperature range.
Features
♦ 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 1Ω (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 ...
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