EVALUATION KIT AVAILABLE Click here for production status of specific part numbers. MAX15059 76V, 300mW Boost Converter and Current Monitor for APD Bias Applications General Description Features The MAX15059 constant-frequency pulse-width modulat- Input Voltage Range: +2.8V to +5.5V ing (PWM) step-up DC-DC converter features an internal Wide Output-Voltage Range from (V + 5V) to 76V IN switch and a high-side current monitor with high-speed Internal 1 (typ) 80V MOSFET adjustable current limiting. This device is capable of generating output voltages up to 76V (300mW for the Boost Converter Output Power: 300mW MAX15059A and 200mW for the MAX15059B) and 200mW Version Available for Smaller Inductor provides current monitoring up to 4mA. The MAX15059 Accurate 5% (1:1 and 5:1) High-Side Current operates from 2.8V to 5.5V. Monitor The constant-frequency (400kHz) current-mode PWM Resistor-Adjustable Ultra-Fast APD Current Limit architecture provides low-noise-output voltage that is (1s Response Time) easy to filter. A high-voltage internal power MOSFET Open-Drain Current-Limit Indicator Flag allows this device to boost output voltages up to 76V. Internal soft-start circuitry limits the input current when 400kHz Fixed-Switching Frequency the boost converter starts. The MAX15059 features a Constant PWM Frequency Provides Easy Filtering shutdown mode to save power. in Low-Noise Applications The MAX15059 includes a current monitor with more than Internal Soft-Start three decades of dynamic range and monitors current 2A (max) Shutdown Current ranging from 500nA to 4mA with high accuracy. Resistor- adjustable current limiting protects the APD from optical -40C to +125C Temperature Range power transients. A clamp diode protects the monitors Small, Thermally Enhanced, 3mm x 3mm, Lead-Free, output from overvoltage conditions. Other protection 16-Pin TQFN-EP Package features include cycle-by-cycle current limiting of the boost converter switch, undervoltage lockout (UVLO), and Applications thermal shutdown if the die temperature reaches +125C. Avalanche Photodiode Biasing and Monitoring The MAX15059 is available in a thermally enhanced, PIN Diode Bias Supply lead-free, 16-pin TQFN-EP package and operates over Low-Noise Varactor Diode Bias Supply the -40C to +125C temperature range. FBON Modules GPON Modules Typical Operating Circuit Ordering Information MAXIMUM L1 I : PIN- VIN = 2.8V APD D1 V 4.7H OUT PART POWER TO 5.5V (76V MAX) I PACKAGE MOUT (mW) C IN R2 1F C OUT 348k MAX15059AETE+ 300 1:1 16 TQFN-EP* 0.1F R ADJ IN LX MAX15059BETE+ 200 5:1 16 TQFN-EP* CNTRL PGND R1 MAX15059AATE+ 300 1:1 16 TQFN-EP* 6.34k BIAS MAX15059BATE+ 200 5:1 16 TQFN-EP* FB MAX15059 SHDN GPIO Note: The MAX15059AATE+ and MAX15059BATE+ operate over DAC ILIM GPIO the -40C to +125C temperature range. The MAX15059EATE+ RLIM V DD and MAX15059BETE+ operate over the -40C to +85C tem- V CLAMP DD C R LIM perature range. 2.87k +Denotes a lead(Pb)-free/RoHS-compliant package. ADC SGND APD MOUT C MOUT *EP = Exposed pad. R MOUT OPTIONAL APD 1k (10nF) TIA 19-5132 Rev 4 9/20MAX15059 76V, 300mW Boost Converter and Current Monitor for APD Bias Applications Absolute Maximum Ratings IN, SHDN, FB, ILIM, RLIM, CNTRL to SGND .........-0.3V to +6V Operating Temperature Range LX to PGND...........................................................-0.3V to +80V MAX15059AETE, MAX15059BETE ............... -40C to +85C BIAS to SGND .......................................................-0.3V to +79V MAX15059AATE, MAX15059BATE .............. -40C to +125C APD, CLAMP to SGND ..........................-0.3V to (V + 0.3V) Operating Temperature Range........................... -40C to +85C BIAS PGND to SGND.................................................... -0.3V to +0.3V Maximum Junction Temperature .....................................+150C MOUT to SGND .................................-0.3V to (V + 0.3V) Storage Temperature Range ............................ -65C to +150C CLAMP Continuous Power Dissipation (T = +70C) Lead Temperature (soldering, 10s) .................................+300C A 16-Pin TQFN-EP Soldering Temperature (reflow) .......................................+260C (derate 20.8mW/C above +70C) .........................1666.7mW Package Thermal Characteristics (Note 1) TQFN Junction-to-Ambient Thermal Resistance ( ) ..........48C/W JA Junction-to-Case Thermal Resistance ( ) .................7C/W JC Note 1: Package thermal resistances were obtained using the method described in JEDEC specification JESD51-7, using a four-layer board. For detailed information on package thermal considerations, refer to www.maximintegrated.com/thermal-tutorial. Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. Electrical Characteristics (V = V = V = 3.3V. C = 1F, V = V = 0V, V = 40V. LX = APD = CLAMP = ILIM = unconnected, IN SHDN CNTRL IN PGND SGND BIAS V = 0V, T = -40C to +85C for the MAX15059AETE+ and MAX15059BETE+ and T = -40C to +125C for the MAX15059AATE+ MOUT A A and MAX15059BATE+, unless otherwise noted. Typical values are at T = +25C.) (Note 2) A PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS INPUT SUPPLY Supply Voltage Range V 2.8 5.5 V IN T = -40C to +85C 0.6 1.2 V = 1.4V, no A FB Supply Current I mA SUPPLY switching T = +125C 1.35 A Undervoltage-Lockout Threshold V V rising 2.475 2.6 2.775 V UVLO IN Undervoltage-Lockout Hysteresis V 200 mV UVLO HYS Shutdown Current I V = 0V 0.003 2 A SHDN SHDN Shutdown BIAS Current I V = 3.3V, V = 0V 9 20 A BIAS SHDN BIAS SHDN BOOST CONVERTER Output-Voltage Adjustment V + 5 76 V IN Range Switching Frequency f V = 5V 380 400 420 kHz SW IN Maximum Duty Cycle D V = 2.8V 88 90 92 % CLK IN FB Set-Point Voltage V 1.205 1.23 1.255 V FB SET FB Input-Bias Current I V = V , T = +25C 100 500 nA FB FB FB SET A T = -40C to +85C 1 2 I = 100mA, A LX Internal Switch On-Resistance R ON V = 2.8V IN T = +125C 2.25 A MAX15059A 1.1 1.2 1.3 Peak Switch Current Limit I A LIM LX MAX15059B 0.825 0.9 0.975 Peak Current-Limit Response 100 ns Maxim Integrated 2 www.maximintegrated.com