MAX8515 MAXIM [Maxim Integrated Products], MAX8515 Datasheet

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MAX8515

Manufacturer Part Number
MAX8515
Description
Wide-Input 0.6V Shunt Regulators for Isolated DC-to-DC Converters
Manufacturer
MAXIM [Maxim Integrated Products]
Datasheet

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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.
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.
TOP VIEW
Isolated DC-to-DC Converters
Network, Telecom, and Cellular Base Station
Power Supplies
Low-Dropout Linear Regulators
Shunt Regulator
Adjustable Voltage Reference
PGND
GND
OUT
SC7O/THIN SOT23
1
2
3
________________________________________________________________ Maxim Integrated Products
MAX8515A
MAX8515
General Description
Wide-Input 0.6V Shunt Regulators for
Pin Configuration
4
5 FB
IN
Applications
Isolated DC-to-DC Converters
o MAX8515A
o MAX8515
o Sinks 20mA at 0.2V to 18V
o Input Voltage Range from 1.7V to 28V
o Directly Drives Optocouplers
o 0.2Ω Dynamic Output Impedance
o Space-Saving 5-Pin SC70 or SOT23 Packages
Functional Diagram appears at end of data sheet.
Selector Guide appears at end of data sheet.
MAX8515AEXK-T
MAX8515AEZK-T
MAX8515EXK-T
MAX8515EZK-T
0.6V ±0.5% Initial Accuracy at +25°C
0.6V ±1% Accuracy from -40°C to +85°C
0.6V ±1% Initial Accuracy at +25°C
0.6V ±1.8% Accuracy from -40°C to +85°C
INPUT SUPPLY
1.7V TO 28V
PART
IN
PGND
GND
1.7V TO 18V
MAX8515A
Typical Operating Circuit
MAX8515
INPUT
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
TEMP RANGE
OUT
Ordering Information
FB
PIN-PACKAGE
5 SC70-5
5 Thin SOT23-5
5 SC70-5
5 Thin SOT23-5
ISOLATED DC-DC
CONVERTER
OUTPUT
(DOWN TO 0.6V)
CONTROL
VOLTAGE
PRIMARY SIDE
PWM CONVERTER
Features
1

Related parts for MAX8515

MAX8515 Summary of contents

Page 1

... 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 +25° ...

Page 2

... Lead Temperature (soldering, 10s) .................................+300°C CONDITIONS OUT 28V OUT MAX8515AE_K T = +25°C A MAX8515E_K MAX8515AE_K T = 0°C to +85°C A MAX8515E_K MAX8515AE_K T = -40°C to +85°C A MAX8515E_K I = 1mA to 20mA OUT 28V 1.7V to 28V 0.2V to 18V 1mA OUT OUT V = 28V IN OUT ...

Page 3

... GAIN AND PHASE vs. FREQUENCY V = 0.6V OUT -10 FIGURE 2 -20 -30 0 100 85 FREQUENCY (kHz) OUTPUT VOLTAGE SLEW RATE MAX8515 toc05 V : 2V/div OUT 0.66V 0.55V V : 200mV/div FB 2µs/div 10V 28V LOAD CURRENT (mA) MAX8515 toc03 -45 -90 -135 -180 1000 3 ...

Page 4

... V at 0.2V. The wide input supply range allows the OUT device to operate from 1.7V to 28V. The MAX8515A/ MAX8515 compare the FB input to a precision 600mV reference. If the FB input is low, OUT sinks no current rises above 600mV, OUT sinks up to 20mA. Applications Information Shunt Regulator/Adjustable ...

Page 5

... Figure 1. MAX8515A/MAX8515 Typical Application Circuit, Shunt Regulator/Adjustable Voltage Reference Optical Feedback Figure 3 displays an application circuit using the MAX8515A/MAX8515 in an opto-isolated feedback cir- cuit. The maximum bias current for the photodiode is set with R1. The isolated DC-to-DC converter compen- sation circuit is formed with R2, C3, and C4. Resistors R3 and R4 set the isolated DC-to-DC converter output voltage ...

Page 6

... INPUT Figure 4 shows an isolated OVP circuit. R1 limits the SUPPLY current supplied to the photodiode. R2 limits the MAX8515A/MAX8515 input current. R3 and R4 set the V+ trip threshold for the OVP the input supply decoupling capacitor. Values for R3 and R4 are chosen based on the needed CON OVP threshold ...

Page 7

... Wide-Input 0.6V Shunt Regulators for FZT1049A 1. OUT C1 C2 0.1µF 1.0µF MAX8515A MAX8515 GND FB Figure 5. MAX8515A/MAX8515 Typical Application Circuit, Linear Regulator LINEAR-REGULATOR LOAD REGULATION 0 -0 2.5V CC -1.0 -1.5 -2.0 -2.5 -3 1.2V CC -3.5 -4 220µF VCC -4.5 -5.0 0 0.5 1.0 LOAD CURRENT (A) Figure 6. Load Regulation of Linear-Regulator Circuit _______________________________________________________________________________________ Isolated DC-to-DC Converters ...

Page 8

Wide-Input 0.6V Shunt Regulators for Isolated DC-to-DC Converters (The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information www.maxim-ic.com/packages.) 8 _______________________________________________________________________________________ Package Information ...

Page 9

Wide-Input 0.6V Shunt Regulators for (The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information www.maxim-ic.com/packages.) _______________________________________________________________________________________ Isolated DC-to-DC Converters Package Information (continued) 9 ...

Page 10

Wide-Input 0.6V Shunt Regulators for Isolated DC-to-DC Converters (The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information www.maxim-ic.com/packages.) Maxim cannot assume responsibility for use of any circuitry ...

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