DC-DC Converter. MAX17681 Datasheet

MAX17681 Converter. Datasheet pdf. Equivalent

Part MAX17681
Description Iso-Buck DC-DC Converter
Feature MAX17681 4.5V to 42V Input, High-Efficiency, Iso-Buck DC-DC Converter General Description The MAX1.
Manufacture Maxim Integrated
Datasheet
Download MAX17681 Datasheet

MAX17681 4.5V to 42V Input, High-Efficiency, Iso-Buck DC-DC MAX17681 Datasheet
Recommendation Recommendation Datasheet MAX17681 Datasheet




MAX17681
MAX17681
4.5V to 42V Input, High-Efficiency,
Iso-Buck DC-DC Converter
General Description
The MAX17681/MAX17681A is a high-voltage, high-
efficiency, iso-buck DC-DC converter designed to provide
isolated power up to 5W. The device operates over a
wide 4.5V to 42V input and uses primary-side feedback
to regulate the output voltage.
The MAX17681/MAX17681A uses peak-current-mode
control. The low-resistance, on-chip MOSFETs ensure
high efficiency at full load while simplifying the PCB layout.
The MAX17681/MAX17681A devices generate a well
regulated primary side voltage which is then scaled by a
suitable transformer turns ratio to derive isolated secondary
output rails. While both MAX17681 and MAX17681A
support primary side overcurrent protection, the
MAX17681A is an enhanced design that supports robust
secondary-side overcurrent protection as well.
The MAX17681/MAX17681A is available in a compact
10-pin (3mm x 2mm) TDFN package. Simulation models
are available.
Applications
● Isolated Fieldbus Interfaces
● PLC I/O Modules
● Smart Meters
● Isolated Power Supplies in Medical Equipment
● Floating Power Supply Generation
Application Circuit
VIN
17V TO 32V C1
1µF
C3
1µF
C4
33nF
C6
680pF
R3
4.75kΩ
C5
33nF
VIN
EN/UVLO
LX
PGND
VCC GND
MAX17681
MAX17681A
SS
FB
COMP
RESET
Benefits and Features
● Reduces External Components and Total Cost
• No Optocoupler
• Synchronous Primary Operation
• All-Ceramic Capacitors, Compact Layout
● Reduces Number of DC-DC Regulators to Stock
• Wide 4.5V to 42V Input
• 0.9V to 0.96 x VIN Primary Output Voltage
• Delivers Up to 5W Output Power
● Reduces Power Dissipation
Peak Efficiency > 90%
0.9μA (typ) Shutdown Current
● Operates Reliably in Adverse Industrial Environments
• Peak and Sink Current-Limit Protection
±1.7% Feedback Accuracy
• Programmable EN/UVLO Threshold
• Adjustable Soft-Start
• Overtemperature Protection
• -40°C to +125°C Operation
● Short-Circuit Protection
• MAX17681A Supports Robust Secondary-Side
Short-Circuit Protection
• MAX17681A Is Recommended for All New Designs
Ordering Information appears at end of data sheet.
T1
1:2.4 D1
NPRI
NSEC
VOUT
24V, 100mA
C7
2.2µF
R4
49.9Ω
Z1
R1
105kΩ
R2
10kΩ
C2
10uF
C8
1nF
19-7053; Rev 4; 3/18



MAX17681
MAX17681
4.5V to 42V Input, High-Efficiency,
Iso-Buck DC-DC Converter
Absolute Maximum Ratings
VIN to GND.............................................................-0.3V to +48V
EN/UVLO to GND...................................... -0.3V to (VIN + 0.3V)
LX to PGND............................................... -0.3V to (VIN + 0.3V)
VCC, FB, RESET, COMP, SS to GND.....................-0.3V to +6V
PGND to GND.......................................................-0.3V to +0.3V
LX Total RMS Current.........................................................±1.6A
Output Short-Circuit Duration.....................................Continuous
Operating Temperature Range.......................... -40°C to +125°C
Junction Temperature.......................................................+150°C
Storage Temperature Range............................. -65°C to +160°C
Lead Temperature (soldering, 10s).................................. +300°C
Soldering Temperature (reflow)........................................+260°C
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these
or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect
device reliability.
Package Information
PACKAGE TYPE: 10 TDFN
Package Code
T1032N+1
Outline Number
21-0429
Land Pattern Number
90-0082
THERMAL RESISTANCE, FOUR-LAYER BOARD (Note 1)
Junction to Ambient (θJA)
Junction to Case (θJC)
67.3°C/W
18.2°C/W
For the latest package outline information and land patterns (footprints), go to www.maximintegrated.com/packages. Note that a “+”,
“#”, or “-” in the package code indicates RoHS status only. Package drawings may show a different suffix character, but the drawing
pertains to the package regardless of RoHS status.
Package thermal resistances were obtained using the method described in JEDEC specification JESD51-7, using a four-layer board.
For detailed information on package thermal considerations, refer to www.maximintegrated.com/thermal-tutorial.
Note 1: Continuous Power Dissipation (TA = +70°C) (derate 14.9mW/°C above +70°C) (multilayer board) 1188.7mW
www.maximintegrated.com
Maxim Integrated 2





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