Evaluates: MAX17681A for Isolated +24V Output Configuration. MAX17681A Evaluation Kit. General Description. Quick Start. Features
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1 General Description The MAX768AEVKITF is a fully assembled and tested circuit board that demonstrates the performance of the MAX768A high-efficiency, iso-buck DC-DC Converter. The EV kit operates over a wide input-voltage range of 7V to 36V and uses primary-side feedback to regulate the output voltage. The EV kit output is programmed to +24V at 00mA, with ±8% output voltage regulation. The EV kit comes installed with the MAX768A in a 0-pin (3mm x 2mm) TDFN package. Features 7V to 36V Input Voltage Range +24V, 00mA Continuous Current EN/UVLO Input 200kHz Switching Frequency Overcurrent Protection No Optocoupler Delivers up to 2.4W Output Power Overtemperature Protection Proven PCB Layout Provides robust primary and secondary output short-circuit protection Ordering Information appears at end of data sheet. Quick Start Recommended Equipment One 5V 60V DC, 0.5A power supply One resistive load 00mA sink capacity Two digital multimeters (DMM) Caution: Do not turn on the power supply until all connections are completed. Test Procedure The EV kit comes with the default output configuration programmed to +24V. ) Verify that J is open. 2) Verify that R7 is not installed. 3) Set the power supply output to 24V. Disable the power supply. 4) Connect the positive terminal of the power supply to the V IN PCB pad and the negative terminal to the nearest PGND PCB pad. Connect a 00mA resistive load across the +24V PCB pad and the GND0 PCB pad. 5) Connect a DMM configured in voltmeter mode across the +24V PCB pad and the nearest GND0 PCB pad. 6) Enable the input power supply. 7) Verify that output voltage is at +24V (with allowable tolerance of ±8%) with respect to GND0. 8) If required, vary the input voltage from 7V to 36V, and the load current from 0mA to 00mA and verify that output voltage is at +24V (with allowable tolerance of ±8%) ; Rev 0; 3/7
2 Detailed Description The MAX768AEVKITF evaluation kit (EV kit) is a fully assembled and tested circuit board that demonstrates the performance of the MAX768A high efficiency, iso-buck DC-DC converter designed to provide an isolated power up to 2.4W. The EV kit generates +24V, 00mA from a 7V to 36V input supply. The EV kit features a forced PWM control scheme that provides constant switchingfrequency of 200kHz operation at all load and line conditions. The EV kit includes an EN/UVLO PCB pad to monitor and program the EN/UVLO pin of the MAX768A. The V PRI PCB pad helps measure the regulated primary output voltage (V PRI ). An additional RESET PCB pad is available for monitoring the health of primary output voltage (V PRI ). RESET is pulled low if FB voltage drops below 92.5% of its set value. RESET goes high impedance 024 clock cycles after FB voltage rises above 95.5% of its set value. The programmable soft-start feature allows users to reduce the input inrush current. The iso-buck is a synchronous-buck-converter-based topology, useful for generating isolated outputs at low power level without using an optocoupler. The detailed procedure for setting the soft-start time, ENABLE/UVLO divider, primary output voltage (V PRI ) selection, adjusting the primary output voltage, primary inductance selection, turns-ratio selection, output capacitor selection, output diode selection and external loop compensation are given in MAX768 IC data sheet. Enable Control (J) The EN/UVLO pin on the device serves as an on/off control while also allowing the user to program the input undervoltage-lockout (UVLO) threshold. J configures the EV kit s output for turn-on/turn-off control. Install a shunt across J pins 2-3 to disable V OUT. See Table for proper J configurations. NOTE : The secondary output diodes D is rated to carry short-circuit current only for few 00 s of ms and is not rated to carry the continuous short-circuit current. NOTE 2: The iso-buck converter typically needs 0% minimum load to regulate the output voltage. In this design when the +24V rail is healthy, the U2 sinks the minimum load current required to regulate the output voltages within ±8% regulation. Table. Enable Control (EN/UVLO) (J) Jumper Settings SHUNT POSITION EN/UVLO PIN V OUT J -2 Connected to V IN Always Enabled 2-3 Connected to GND Always Disabled Open* Connected to midpoint of R, R2 resistor-divider Enabled at V IN 5.5V *Default position. Maxim Integrated 2
3 EV Kit Performance Report EFFICIENCY (%) 00 EFFICIENCY vs. LOAD CURRENT toc V IN = 36V 50 V IN = 24V 40 V IN = 7V V OUTPUT LOAD CURRENT (ma) OUTPUT VOLTAGE (V) OUTPUT VOLTAGE vs. LOAD CURRENT V OUTPUT 25.0 V IN = 24V V IN = 36V V IN = 7V LOAD CURRENT (ma) toc2 LOAD TRANSIENT RESPONSE (LOAD CURRENT FROM 50mA TO 00mA ON +24V) toc3 V OUT (AC) V/div 50mA/div I OUT 400µs/div Maxim Integrated 3
4 Component Suppliers SUPPLIER Wurth Electronik Murata Americas Panasonic Corp. WEBSITE Note: Indicate that you are using the MAX768A when contacting these component suppliers. Ordering Information PART MAX768AEVKITF# #Denotes RoHS compliant. TYPE EVKIT Maxim Integrated 4
5 MAX768A EV Kit Bill of Materials S NO Des Qty Description Mfctr PN- Mfctr PN-2 Mfctr PN-3 Mfctr PN-4 C µf±0%, 50V,X7R Ceramic capacitor (206) Murata GRM3CR7H05KA6 KEMET C206C05K5RAC Murata GRM3MR7H05KA88 2 C2 µf±0% 6V X7R Ceramic capacitor (0603) Murata GRM88R7C05KA2 KEMET C0603C05K4RAC TDK C608X7RC05K 3 C UFnF±0%,25V, X7R ceramic capacitor (0402) Murata GRM55R7E333KA88 4 C UFnF±0%,6V, X7R ceramic capacitor (0402) Murata GRM55R7C823K KEMET C0402C823K4RAC 5 C5 820pF±5%,50V,X7R ceramic capacitor (0402) Murata GRM55R7H82K KEMET C0402C82K5RAC 6 C6 0uF±0%,6V, X7R ceramic capacitor (206) Murata GRM3CR7C06KAC7 7 C7 0.0uF±0%, 50V, X7R ceramic capacitor (0402) Murata GRM55R7H03KA88 KEMET C0402C03K5RAC 8 C8 22uF, 20%, 50V, ALUMINUM ELECTROLYTIC CAPACITOR 6.60*6.60mm, Panasonic EEEFKH220P TAIYO YUDEN EMK07B705KA 9 C9 2.2uF±0%,50V, X7R ceramic capacitor (206) Murata GRM3CR7H225KA88 TAIYO YUDEN UMK36B7225K 0 C0 000pF±0%, 500V, X7R ceramic capacitor (206) AVX 206SC02KAT D 00V/A, PowerDI 23 Diode Inc. DFLS00-7 SULLINS ELECTRONICS CORP 2 J 3-pin headers PEC03SAAN 3 R 3.0M Ohm±% resistor (0402) CRCW04023M0FK 4 R2 26K Ohm±% resistor (0402) CRCW040226KFK 5 R3 0K Ohm±% resistor (0402) CRCW04020KFK 6 R4 0.5kΩ ±% resistor (0402) PANASONIC ERJ-2RKF052 7 R5 3.74kΩ ±% resistor (0402) PANASONIC ERJ2RKF374 8 R6 00kΩ ±5% resistor (0402) PANASONIC ERJ-2GEJ04X 9 R7 OPEN (0402) 20 R8 22Ω ±% resistor (0402) CRCW040222R0FK 2 R9 90.9kΩ ±% resistor (0402) PANASONIC ERJ-2RKF9092X 22 R0 0kΩ ±% resistor (0402) CRCW04020K0JN WURTH ELECTRONICS INC. 23 T EP0, 8-pin SMT, 80µH,.2A,2.4: U MAX768A TDFN0 3*2mm Iso buck DC-DC converter MAX768AATB+ 25 U2 Shunt regulator SOT25 Diode Inc. TL43BW5 SUMIDA CEP T092 Maxim Integrated 5
6 MAX768A EV Kit Schematic PGND VIN C8 22UF C UF 3.0M 2 C7 0.0UF UF 26K U MAX768AATB+ PGND LX 0 R6 00K C6 0UF 3.74K C5 820PF C UF SGND PGND R3 R7 0K PACKOUT R4 0.5K PGND R8 22 EN/UVLO RESET VIN EN/UVLO VCC C UF RESET VCC 000PF GND0 R9 90.9K R0 0K C9 2.2UF GND0 3 U EN/UVLO R C2 R2 R5 2 SGND RESET 3 EN/UVLO RESET 8 7 VPRI 4 T C0 5 8 D A C +24V GND0 J VIN GND 9 VCC COMP FB SS 6 EP PRI SEC Maxim Integrated 6
7 MAX768A EV Kit PCB Layout Diagrams.0 MAX768A EV Kit Top Silkscreen.0 MAX768A EV Kit Top Maxim Integrated 7
8 MAX768A EV Kit PCB Layout Diagrams (continued).0 MAX768A EV Kit Bottom Maxim Integrated 8
9 Revision History REVISION NUMBER REVISION DATE DESCRIPTION PAGES CHANGED 0 3/7 Initial release For pricing, delivery, and ordering information, please contact Maxim Direct at , or visit Maxim Integrated s website at. Maxim Integrated cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim Integrated product. No circuit patent licenses are implied. Maxim Integrated reserves the right to change the circuitry and specifications without notice at any time. Maxim Integrated and the Maxim Integrated logo are trademarks of Maxim Integrated Products, Inc. 207 Maxim Integrated Products, Inc. 9
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HP420X. 5A, High Efficiency POL Module GENERAL DESCRIPTION: FEATURES: APPLICATIONS: TYPICAL APPLICATION CIRCUIT & PACKAGE SIZE:
FEATURES: High Power Density Power Module 5A Maximum Load Input Voltage Range from 9.0V to 40.0V Output Voltage Range from 1.0V to 5.0V Excellent Thermal Performance 94% Peak Efficiency Enable Function
ZSPM401x Application Note - Circuit Layout and Component Selection Contents
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800mA Lithium Ion Battery Linear Charger
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LANC245.1W12. DC/DC Converter VDC Input 5.1 VDC Output at 2.4A. Features:
DC/DC Converter 18-36 VDC Input 5.1 VDC Output at 2.4A Features: Applications: Distributed Power Architectures Communications Equipment Computer Equipment Work Stations UL TUV CB CE MARK RoHS Compliant
North America Asia-Pacific Europe, Middle East
Bel Power Solutions point-of-load converters are recommended for use with regulated bus converters in an Intermediate Bus Architecture (IBA). The YMS nonisolated dc-dc converters deliver up to A of output
Standalone Linear Li-Ion Battery Charger with Thermal Regulation
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EB Series Eighth - Brick Up to 100 Watt DC-DC Converter
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CONSONANCE. 1A LiFePO4 Battery Charger CN3058E. Features: General Description: Applications: Pin Assignment
A LiFePO4 Battery Charger CN3058E General Description: The CN3058E is a complete constant-current /constant voltage linear charger for single cell LiFePO4 rechargeable batteries. The device contains an
CONSONANCE. 1A Nickel-Metal Hydride Battery Charger IC CN3085. General Description: Features: Pin Assignment. Applications:
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DC/DC Converter Reference Circuit
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Lithium Ion Battery Charger for Solar-Powered Systems
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MAX6971 Evaluation Kit. Evaluates: MAX6971
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A4063. AiT Semiconductor Inc. APPLICATION ORDERING INFORMATION TYPICAL APPLICATION
DESCRIPTION The is a 2A Li-Ion battery switching charger intended for 5V adapters. Low power dissipation, an internal MOSFET and its compact package with minimum external components requirement makes the
800mA Standalone Linear Li-Ion Battery Charger with Dual LED Display
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1A Linear Li+ Battery Chargers with Integrated Pass FET and Thermal Regulation in 2mm x 2mm TDFN
19-3670; Rev 0; 4/05 EVALUATION KIT AVAILABLE 1A Linear Li+ Battery Chargers with Integrated Pass General Description The intelligent, stand-alone constant-current/constant-voltage (CCCV), thermally regulated
XA4202. The XA4202 is available in the 8-lead SO Package. Charging Docks Handheld Instruments Portable Computers.
Standalone Li-Lon Switch Mode Battery Charger Features Input Supply Range: 4.7V-6V High Efficiency Current Mode PWM Controller End - Charge - Current Detection Output Constant Switching Frequency for Minimum
All inclusive. #MAGICPOWERMODULES
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PT1054 Lithium Ion Battery Linear Charger
GENERAL DESCRIPTION PT1054 is a complete CC/CV linear charger f or single cell lithium-ion batteries. it is specifically designed to work within USB power Specifications. No external sense resistor is
COTAG GENERAL DESCRIPTION
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S24SP series 40W Single Output DC/DC Converter
4W Single Output DC/DC Converter FEATURES Efficiency up to 92.8% Wide input range, 9V-36V Package with Industry Standard Pinout Package Dimension: Without heat sink 5.8 x25.4 x1.2mm (2. x1. x.4 ) With
800mA Linear Li-Ion Battery Charger
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Package: RN: SOT23-5 TRN: TSOT23-5 Features: P: Standard (default, lead free) C: Customized. 1uF
FEATURES Programmable Charge Current Up to 8mA No MOSFET, Sense Resistor or Blocking Diode Required Preset 4.2V Charge Voltage with ±1% Accuracy Charge Current Monitor Output for Gas Gauging Thermal Regulation
150 WATT HEW SINGLE SERIES DC/DC CONVERTERS
Features Description The 4:1 Input Voltage 150 W single HEW Series of DC/DC converters provide precisely regulated dc outputs. The output voltage is fully isolated from the input, allowing the output to
AAT A USB Port/Adapter Lithium-Ion/Polymer Battery Charger
General Description Features BatteryManager The AAT3690 BatteryManager is a highly integrated single-cell lithium-ion/polymer battery charger IC designed to operate with port and AC adapter inputs. It
800mA Lithium Ion Battery Linear Charger
GENERAL DESCRIPTION is a complete CC/CV linear charger for single cell lithium-ion batteries. it is specifically designed to work within USB power Specifications. No external sense resistor is needed and