The MAX15059 constant-frequency pulse-width modulating (PWM) step-up DC-DC converter features an internal switch and a high-side current monitor with high-speed adjustable current limiting. This device is capable of generating output voltages up to 76V (300mW for the MAX15059A and 200mW for the MAX15059B) and provides current monitoring up to 4mA. The MAX15059 operates from 2.8V to 5.5V.

The constant-frequency (400kHz) current-mode PWM architecture provides low-noise-output voltage that is easy to filter. A high-voltage internal power MOSFET allows this device to boost output voltages up to 76V. Internal soft-start circuitry limits the input current when the boost converter starts. The MAX15059 features a shutdown mode to save power.

The MAX15059 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 (UVLO), and thermal shutdown if the die temperature reaches +125°C.

The MAX15059 is available in a thermally enhanced, lead-free, 16-pin TQFN-EP package and operates over the -40°C to +125°C temperature range.

MAX15059: Typical Operating Circuit

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Key Features

Input Voltage Range: +2.8V to +5.5V
Wide Output-Voltage Range from (V_IN + 5V) to 76V
Internal 1Ω (typ) 80V MOSFET
Boost Converter Output Power: 300mW
200mW Version Available for Smaller Inductor
Accurate ±5% (1:1 and 5:1) 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°C to +125°C Temperature Range
Small, Thermally Enhanced, 3mm x 3mm, Lead-Free, 16-Pin TQFN-EP Package

Applications/Uses

Avalanche Photodiode Biasing and Monitoring
FBON Modules
GPON Modules
Low-Noise Varactor Diode Bias Supply
PIN Diode Bias Supply

Key Specs

Part Number

V_IN
(V)

V_OUT1
(V)

I_OUT1
(A)

Output Adjust. Method

Switch Type

I_CC
(mA)

Shutdown Mode Supply Current
(µA)

DC-DC Outputs

Oper. Freq.
(kHz)

Package/Pins

Budgetary
Price

min

max

min

max

typ

max

See Notes

MAX15059

2.8

5.5

0.005

Resistor

Voltage

Internal

0.6

0.003

400

TQFN/16

$1.88 @1k

See All Step-Up Switching Regulators (94)

Pricing Notes:

This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific and version-specific prices and delivery, please see the price and availability page or contact an authorized distributor.

Design Resources

MAX15059EVKIT: Evaluation Kit for the MAX15059A and MAX15059B

Technical Documents

Tutorial 660 Regulator Topologies for Battery-Powered Systems

Quality and Environmental Data

Product Reliability Reports: MAX15059.pdf
Lead-Free Package Tin (Sn) Whisker Reports

Additional Resources

Topmark Coding MAX15059

Quality And Environmental

Device	Fab Process	Technology	Sample size	Rejects	FIT at 25°C	FIT at 55°C

Note : The failure rates are summarized by technology and mapped to the associated material part numbers. The failure rates are highly dependent on the number of units tested.

Quality Management System >
Environmental Management System >

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