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General Description

The MAX15031 consists of a constant-frequency pulse-

width 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 cur-

rent 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 limit-

ing 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.

Applications

Avalanche Photodiode Biasing and Monitoring

PIN Diode Bias Supplies

Low-Noise Varactor Diode Bias Supplies

FBON Modules

GPON Modules

LCD Displays

Features

o Input Voltage Range

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

+5.5V to +11V

o Wide Output-Voltage Range from (V

+ 1V) to 76V

o Internal 1Ω (typ) 80V Switch

o 300mW Boost Converter Output Power

o Accurate ±10% (500nA to 1mA) and ±3.5% (1mA

to 4mA) High-Side Current Monitor

o Resistor-Adjustable Ultra-Fast APD Current Limit

(1µs Response Time)

o Open-Drain Current-Limit Indicator Flag

o 400kHz Fixed Switching Frequency

o Constant PWM Frequency Provides Easy Filtering

in Low-Noise Applications

o Internal Soft-Start

o 2µA (max) Shutdown Current

o -40°C to +125°C Temperature Range

o Small Thermally Enhanced, 4mm x 4mm, 16-Pin

TQFN Package

MAX15031

80V, 300mW Boost Converter and Current

Monitor for APD Bias Applications

________________________________________________________________

Maxim Integrated Products

PWR

CLAMP

RLIM

APD

SHDN

12 11 9

PGND

ILIM

CNTRL

SGND

CN MOUT

BIAS

THIN QFN

(4mm

× 4mm)

TOP VIEW

MAX15031

*EP

*EXPOSED PAD

Pin Configuration

Ordering Information

19-4299; Rev 1; 3/09

For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,

or visit Maxim’s website at www.maxim-ic.com.

EVALUATION KIT

AVAILABLE

PART TEMP RANGE

PIN-PACKAGE

MAX15031ATE+

-40°C to +125°C 16 TQFN-EP*

Denotes a lead(Pb)-free/RoHS-compliant package.

EP = Exposed pad.

Typical Operating Circuits appear at end of data sheet.

1 2 3 4 5 6 ... 16 17

MAX15031 1

Resumo do Conteúdo

Página 1 - MAX15031

General DescriptionThe MAX15031 consists of a constant-frequency pulse-width modulating (PWM) step-up DC-DC converter withan internal switch and a hig

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MAX1503180V, 300mW Boost Converter and CurrentMonitor for APD Bias Applications10 ____________________________________________________________________

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MAX15031The MAX15031 includes a versatile current monitorintended for monitoring the APD, PIN, or varactor diodeDC current in fiber and other applicat

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MAX1503180V, 300mW Boost Converter and CurrentMonitor for APD Bias Applications12 ____________________________________________________________________

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MAX15031Diode SelectionThe MAX15031’s high switching frequency demands ahigh-speed rectifier. Schottky diodes are recommend-ed for most applications b

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MAX1503180V, 300mW Boost Converter and CurrentMonitor for APD Bias Applications14 ____________________________________________________________________

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MAX15031MAX15031CNTRLCPCNINPGNDFBBIASSHDNMOUTAPDSGNDRLIMPWRLXGPIOILIMGPIOCLAMPVDDµCVDDAPDCIN1µFCCP10nFRMOUT10kΩCOUT0.1µFCMOUT(OPTIONAL)R16.34kΩRLIM2.8

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MAX1503180V, 300mW Boost Converter and CurrentMonitor for APD Bias Applications16 ____________________________________________________________________

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MAX1503180V, 300mW Boost Converter and CurrentMonitor for APD Bias ApplicationsMaxim cannot assume responsibility for use of any circuitry other than

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MAX1503180V, 300mW Boost Converter and CurrentMonitor for APD Bias Applications_______________________________________________________________________

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MAX1503180V, 300mW Boost Converter and CurrentMonitor for APD Bias Applications4 _____________________________________________________________________

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LIGHT-LOAD SWITCHINGWAVEFORM WITH RC FILTERMAX15031 toc091µs/divVBIASAC-COUPLEDVLX50V/divIL500mA/div1mV/div0mA0VIOUT = 0.1mA, VBIAS = 70VMAX1503180V,

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MAX1503180V, 300mW Boost Converter and CurrentMonitor for APD Bias Applications_______________________________________________________________________

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MAX1503180V, 300mW Boost Converter and CurrentMonitor for APD Bias Applications8 _____________________________________________________________________

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MAX1503180V, 300mW Boost Converter and CurrentMonitor for APD Bias Applications_______________________________________________________________________

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Rainbow-electronics MAX15031 Manual do Utilizador

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