General Description
The MAX8515A/MAX8515 shunt regulators simplify the
design of voltage regulation and overvoltage protection
(OVP) functions in high-accuracy isolated DC-to-DC con-
verters with output voltages as low as 0.6V. The devices
have supply voltage and feedback inputs separated from
the output shunt stage, and can operate directly from the
DC-to-DC converter output stage when the output voltage
is 1.8V to 18V. Alternately, the MAX8515A/MAX8515 input
stage can be biased from an unregulated 1.7V to 28V
supply, independent of DC-to-DC converter output volt-
age. The MAX8515A/MAX8515 shunts 20mA when the
output voltage is as low as 0.2V.
The MAX8515A features an initial output accuracy of
0.5% at +25°C and 1% from -40°C to +85°C and provides
the output voltage regulation function for isolated DC-to-
DC converters. The MAX8515 features initial output
accuracy of 1% at +25°C and 1.8% from -40°C to +85°C
and can provide an output OVP function for isolated DC-
to-DC converters. High open-loop bandwidth allows
design of high-bandwidth DC-to-DC converters.
Low-cost, low-dropout linear regulators can be designed
with the MAX8515A/MAX8515 and an external NPN tran-
sistor for cost-conscious applications that do not require
overcurrent, short-circuit, or overtemperature protection.
The MAX8515/MAX8515A are available in space-saving
5-pin SC70 and SOT23 packages and are specified over
the -40°C to +85°C extended temperature range. An eval-
uation kit is available to speed designs.
Applications
Isolated DC-to-DC Converters
Network, Telecom, and Cellular Base Station
Power Supplies
Low-Dropout Linear Regulators
Shunt Regulator
Adjustable Voltage Reference
Features
♦MAX8515A
0.6V ±0.5% Initial Accuracy at +25°C
0.6V ±1% Accuracy from -40°C to +85°C
♦MAX8515
0.6V ±1% Initial Accuracy at +25°C
0.6V ±1.8% Accuracy from -40°C to +85°C
♦Sinks 20mA at 0.2V to 18V
♦Input Voltage Range from 1.7V to 28V
♦Directly Drives Optocouplers
♦0.2ΩDynamic Output Impedance
♦Space-Saving 5-Pin SC70 or SOT23 Packages
MAX8515A/MAX8515
Wide-Input 0.6V Shunt Regulators for
Isolated DC-to-DC Converters
________________________________________________________________ Maxim Integrated Products 1
19-2528; Rev 1; 2/03
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
Ordering Information