Wide-Input 0.6V Shunt Regulators Isolated DC-DC Converters MAX851

The Datasheet Archive - 100 Million Datasheets from 7500 Manufacturers.

Wide-Input 0.6V Shunt Regulators Isolated DC-DC Converters MAX851

Datasheet Thumbnail

Top Searches for this datasheet

19-2528; 7/02
Wide-Input 0.6V Shunt Regulators Isolated DC-DC Converters
MAX8515A 0.6V ±0.5% Initial Accuracy +25°C 0.6V Accuracy from -40°C +85°C MAX8515 0.6V Initial Accuracy +25°C 0.6V ±1.8% Accuracy from -40°C +85°C Sinks 20mA 0.2V Input Voltage Range from 1.7V Directly Drives Optocouplers Dynamic Output Impedance Space-Saving 5-Pin SC70 SOT23 Packages
MAX8515A/MAX8515
MAX8515A/MAX8515 shunt regulators simplify design voltage regulation overvoltage protection (OVP) functions high-accuracy isolated DC-DC converters with output voltages 0.6V. devices have supply voltage feedback inputs separated from output shunt stage, operate directly from DC-DC converter output stage when output voltage 1.8V 18V. Alternately, MAX8515A/MAX8515 input stage biased from unregulated 1.7V supply, independent DC-DC converter output voltage. MAX8515A/MAX8515 shunts 20mA when output voltage 0.2V. MAX8515A features initial output accuracy 0.5% +25°C from -40°C +85°C provides output voltage regulation function isolated DC-DC converters. MAX8515 features initial output accuracy +25°C 1.8% from -40°C +85°C provide output function isolated DC-DC converters. High open-loop bandwidth allows design high-bandwidth DC-DC converters. Low-cost, low-dropout linear regulators designed with MAX8515A/MAX8515 external transistor cost-conscious applications that require overcurrent, short-circuit, overtemperature protection. MAX8515/MAX8515A available space-saving 5-pin SC70 SOT23 packages specified over -40°C +85°C extended temperature range. evaluation available speed designs.
Ordering Information
PART TEMP RANGE PININITIAL PACKAGE ACCURACY 0.6V, 0.5% feedback 0.6V, 0.5% feedback 0.6V, feedback 0.6V, feedback
MAX8515AEXK-T -40°C +85°C SC70-5 MAX8515AEZK-T -40°C +85°C MAX8515EXK-T MAX8515EZK-T Thin SOT23-5
-40°C +85°C SC70-5 -40°C +85°C Thin SOT23-5
Applications
Isolated DC-DC Converters Network, Telecom, Cellular Base Station Power Supplies Low-Dropout Linear Regulators Shunt Regulator Adjustable Voltage Reference
Functional Diagram appears data sheet.
Typical Operating Circuit
INPUT SUPPLY INPUT 1.7V 1.7V PRIMARY SIDE CONVERTER CONTROL VOLTAGE
Configuration
VIEW
PGND
MAX8515A MAX8515
MAX8515A MAX8515 PGND
ISOLATED DC-DC CONVERTER OUTPUT (DOWN 0.6V)
SC7O/THIN SOT23
Maxim Integrated Products
pricing, delivery, ordering information, please contact Maxim/Dallas Direct! 1-888-629-4642, visit Maxim's website www.maxim-ic.com.
Wide-Input 0.6V Shunt Regulators Isolated DC-DC Converters MAX8515A/MAX8515
ABSOLUTE MAXIMUM RATINGS
.-0.3V +30V .-0.3V +20V .-0.3V lower 5.5V (VIN +0.3V) PGND .-0.3V +0.3V Continuous Power Dissipation =+70°C) 5-Pin SC70 (derate 3.1mW/°C above +70°C) .246.9mW 5-Pin Thin SOT23 (derate 9.1mW/°C above +70°C) .727mW Operating Temperature Range .-40°C +85°C Junction Temperature Range .-40°C +150°C Storage Temperature Range .-65°C +150°C Lead Temperature (soldering, 10s) .+300°C
Stresses beyond those listed under "Absolute Maximum Ratings" cause permanent damage device. These stress ratings only, functional operation device these other conditions beyond those indicated operational sections specifications implied. Exposure absolute maximum rating conditions extended periods affect device reliability.
ELECTRICAL CHARACTERISTICS
(VIN 3.3V, IOUT 5mA, -40°C +85°C, unless otherwise noted. Typical values +25°C.) (Note
PARAMETER Voltage Range Supply Current +25°C Threshold Accuracy +85°C -40°C +85°C Load Regulation Line Regulation Output Voltage Regulation Input Bias Current Voltage Range Maximum Output Current Output Leakage Current Dynamic Output Impedance VOUT IOUT(MAX) VOUT 0.2V, 0.63V IOUT(LEAK) ZOUT 28V, VOUT 18V, +25°C +85°C 0.001 0.03 0.32 IFB(BIAS) IOUT 20mA 1.7V VOUT 0.2V 18V, IOUT -0.1 0.02 MAX8515AE_K MAX8515E_K MAX8515AE_K MAX8515E_K MAX8515AE_K MAX8515E_K 0.597 0.594 0.595 0.592 0.594 0.589 0.603 0.606 0.605 0.608 0.606 0.608 +0.1 IOUT 0.3mA IOUT 10mA SYMBOL CONDITIONS UNITS
IOUT 20mA, <1kHz
Note Devices production tested +25°C, limits over temperature guaranteed design.
Wide-Input 0.6V Shunt Regulators Isolated DC-DC Converters
Typical Operating Characteristics
(VIN 3.3V, IOUT 5mA, OUT, circuit Figure 0.1µF, 1µF, +25°C, unless otherwise specified.)
BIAS CURRENT TEMPERATURE
MAX8515 toc01
MAX8515A/MAX8515
OUT-LEAKAGE CURRENT TEMPERATURE
OUT-LEAKAGE CURRENT (nA) GAIN (dB) VOUT
MAX8515 toc02
GAIN PHASE FREQUENCY VOUT 0.6V
FIGURE FREQUENCY (kHz)
3.3V BIAS CURRENT (nA)
MAX8515 toc03
-135 PHASE (DEGREES)
TEMPERATURE (°C) TEMPERATURE (°C)
-180 1000
GAIN PHASE FREQUENCY VOUT
GAIN (dB)
MAX8515 toc04
OUTPUT VOLTAGE SLEW RATE
PHASE (DEGREES)
MAX8515 toc05
VOUT: 2V/div
FREQUENCY (kHz) FIGURE -135 -180 1000
0.66V 0.55V VFB: 200mV/div OPEN 2µs/div
POWER-SUPPLY REJECTION RATIO FREQUENCY
MAX8515 toc06
SUPPLY CURRENT LOAD CURRENT
SUPPLY CURRENT (mA) 3.3V
MAX8515 toc07
PSRR (dB) -40°C +25°C +85°C +25°C
LOAD CURRENT (mA)
FREQUENCY (Hz)
Wide-Input 0.6V Shunt Regulators Isolated DC-DC Converters MAX8515A/MAX8515
Typical Operating Characteristics (continued)
(VIN 3.3V, IOUT 5mA, OUT, circuit Figure 0.1µF, 1µF, +25°C, unless otherwise specified.)
OUTPUT VOLTAGE CHANGE LOAD CURRENT
OUTPUT VOLTAGE CHANGE -0.1 -0.2 -0.3 LOAD CURRENT (mA) -0.01 INPUT VOLTAGE
MAX8515 toc08
OUTPUT VOLTAGE CHANGE INPUT VOLTAGE
MAX8515 toc09
0.05 0.04 0.03 0.02 0.01
OUTPUT VOLTAGE CHANGE
Description
NAME PGND FUNCTION Power Ground. Connect PGND together. Analog Ground. Connect PGND together. Output. Connect ceramic capacitor from GND. Applications Information section. Supply Input. Connect 0.1µF capacitor GND. Feedback Input. Regulates 600mV.
Detailed Description
MAX8515A/MAX8515 adjustable shunt regulators feature isolated supply inputs outputs, ideal isolated power-supply applications using optocoupler feedback path. MAX8515A/MAX8515 sink 20mA with VOUT 0.2V. wide input supply range allows device operate from 1.7V 28V. MAX8515A/ MAX8515 compare input precision 600mV reference. input low, sinks current. rises above 600mV, sinks 20mA.
when output voltage 0.6V. resistor-divider connected from produces higher output voltages allows smaller output capacitor. value output capacitor inversely proportional output voltage: VOUT COUT VOUT current limit with resistor connected from OUT. This type shunt regulator limited low-current applications. MAX8515A/MAX8515 typically sink 20mA this application. Figure shows test circuits gain phase plots.
Applications Information
Shunt Regulator/Adjustable Voltage Reference
Figure shows MAX8515A/MAX8515 configured shunt regulator. Connect output voltage 0.6V. Connect 1.0µF capacitor from
Wide-Input 0.6V Shunt Regulators Isolated DC-DC Converters MAX8515A/MAX8515
1.8V VOUT 0.6V/20mA MAX8515A MAX8515 PGND SHORT OPEN 1.0µF 1.33k 0.1µF MAX8515A MAX8515 PGND 2.2nF REFERENCE NETWORK ANALYZER SOURCE 3.3V VOUT 0.6V TEST CIRCUIT 0.82µF 5.6V
2.2nF
TEST
0.1µF
Figure MAX8515A/MAX8515 Typical Application Circuit, Shunt Regulator/Adjustable Voltage Reference
GAIN TEST/REFERENCE
Optical Feedback
Setting VOUT Figure displays application circuit using MAX8515A/MAX8515 opto-isolated feedback circuit. maximum bias current photodiode with isolated DC-DC converter compensation circuit formed with Resistors isolated DC-DC converter output voltage. decouples input supply needed stabilize MAX8515A/MAX8515. Calculate VREG with following equation: VREG calculate example, given regulator output voltage 1.8V 10k, found 20k. Compensation Circuit typical compensation scheme depicted Figure provides integrator function that minimizes output regulation error. provides additional phase compensation zero frequency
GAIN TEST/REFERENCE 115k 3.3V VOUT TEST CIRCUIT 0.1µF MAX8515A MAX8515 PGND
TEST 2.2nF 160k
0.1µF 90.1k NETWORK ANALYZER SOURCE
2.2nF REFERENCE
Figure Test Circuits Gain Phase Plots
midband gain given high-frequency noise rejection. Determine based midband gain required isolated power supply. Choose based power supply small-signal transfer function. Calculate once known.
Wide-Input 0.6V Shunt Regulators Isolated DC-DC Converters MAX8515A/MAX8515
Overvoltage Protection
VREG 1.8V MAX5003 NDRV PGND INPUT SUPPLY
Figure shows isolated circuit. limits current supplied photodiode. limits MAX8515A/MAX8515 input current. trip threshold OVP. input supply decoupling capacitor. Values chosen based needed threshold. example, trip threshold above rated output voltage needed circuit. values determined from following equation once chosen; recommended Then, 6.2k.
0.1µF MAX8515A MAX8515 PGND
0.1µF
where VOVP 0.8V 1.25 given example.
Linear Regulator
external pass transistor conjunction with MAX8515A/MAX8515 create linear regulator shown Figure Determine output voltage regulator VREG 0.6V Choose maintain load regulation load. following equation:
Figure MAX8515A/MAX8515 Typical Application Circuit, Opto-Feedback Circuit
1.2k
FEEDBACK OPTOCOUPLER DC-DC OUTPUT 0.8V
VIN_MIN VREG IO_MAX
0.1µF MAX8515A MAX8515 PGND
6.2k
where IO_MAX rated maximum output current, which this application circuit. VREG output voltage linear regulator. base-to-emitter forward voltage minimum current gain rated load current. minimum input voltage typical application circuit, VIN_MIN 2.375V, VREG 1.0V, 0.65V, 180. Choose fast transient response. input decoupling capacitor compensation capacitor. 1µF, 6.3V capacitor this application. Figure shows typical load-regulation curve circuit Figure This circuit does provide short-circuit, overcurrent, overtemperature protection.
Figure MAX8515A/MAX8515 Typical Application Circuit, Circuit (Set Threshold 0.8V Nominal Output)
Wide-Input 0.6V Shunt Regulators Isolated DC-DC Converters
1.2V 2.5V FZT1049A (MAX) VREG 0.6V REFERENCE 0.1µF MAX8515A MAX8515 22.1 40.2 82.5 1.0µF 6.65k MAX8515A MAX8515
Functional Diagram
MAX8515A/MAX8515
PGND
Chip Information
TRANSISTOR COUNT: PROCESS: BiCMOS
Figure MAX8515A/MAX8515 Typical Application Circuit, Linear Regulator
LINEAR-REGULATOR LOAD REGULATION
-0.5 -1.0 OUTPUT VOLTAGE (mV) -1.5 -2.0 -2.5 -3.0 -3.5 -4.0 -4.5 -5.0 LOAD CURRENT CVCC 220µF 1.2V 2.5V
Figure Load Regulation Linear-Regulator Circuit
Wide-Input 0.6V Shunt Regulators Isolated DC-DC Converters MAX8515A/MAX8515
Package Information
(The package drawing(s) this data sheet reflect most current specifications. latest package outline information, www.maxim-ic.com/packages.)
SC70, 5L.EPS
Wide-Input 0.6V Shunt Regulators Isolated DC-DC Converters
Package Information (continued)
(The package drawing(s) this data sheet reflect most current specifications. latest package outline information, www.maxim-ic.com/packages.)
MAX8515A/MAX8515
THIN SOT23.EPS
Wide-Input 0.6V Shunt Regulators Isolated DC-DC Converters MAX8515A/MAX8515
Package Information (continued)
(The package drawing(s) this data sheet reflect most current specifications. latest package outline information, www.maxim-ic.com/packages.)
Maxim cannot assume responsibility circuitry other than circuitry entirely embodied Maxim product. circuit patent licenses implied. Maxim reserves right change circuitry specifications without notice time.
_Maxim Integrated Products, Gabriel Drive, Sunnyvale, 94086 408-737-7600 2002 Maxim Integrated Products Printed registered trademark Maxim Integrated Products.

Wide-Input 0.6V Shunt Regulators Isolated DC-DC Converters MAX851

Top Searches for this datasheet

Other recent searches