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MAX17681ATB-

Description
Audio Transformers / Signal Transformers MID-IMAXIB Pwr Xfmr For MAX17681
Categorysemiconductor    Power management   
File Size672KB,19 Pages
ManufacturerMaxim
Websitehttps://www.maximintegrated.com/en.html
Download Datasheet Parametric View All

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MAX17681ATB- Overview

Audio Transformers / Signal Transformers MID-IMAXIB Pwr Xfmr For MAX17681

MAX17681ATB- Parametric

Parameter NameAttribute value
Product CategorySwitching Voltage Regulators
ManufacturerMaxim
RoHSDetails
Mounting StyleSMD/SMT
Package / CaseTDFN-10
Output Voltage4.65 V to 5.35 V
Output Current-
Number of Outputs1 Output
Input Voltage MAX42 V
TopologyBuck
Input Voltage MIN4.5 V
Switching Frequency200 kHz
Minimum Operating Temperature- 40 C
Maximum Operating Temperature+ 125 C
PackagingCut Tape
Input Voltage4.5 V to 42 V
Operating Supply Current2.8 mA
Operating Temperature Range- 40 C to + 125 C
Factory Pack Quantity10
TypeHigh Efficiency Synchronous Step-Down
Unit Weight0.001764 oz
MAX17681
General Description
4.5V to 42V Input, High-Efficiency,
Iso-Buck DC-DC Converter
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 V
IN
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
• Robust Secondary-Side Output Overcurrent
Protection (MAX17681A)
±1.7% Feedback Accuracy
• Programmable EN/UVLO Threshold
• Adjustable Soft-Start
• Overtemperature Protection
• -40°C to +125°C Operation
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.
Benefits and Features
Applications
Isolated Fieldbus Interfaces
PLC I/O Modules
Smart Meters
Isolated Power Supplies in Medical Equipment
Floating Power Supply Generation
Ordering Information
appears at end of data sheet.
Application Circuit
V
IN
17V TO 32V
V
IN
EN/UVLO
LX
PGND
T1
1:2.4
D1
V
OUT
24V, 100mA
R4
49.9Ω
Z1
GND
C1
1µF
N
PRI
N
SEC
C7
2.2µF
C3
1µF
V
CC
MAX17681
MAX17681A
SS
FB
R1
105kΩ
R2
10kΩ
C2
10uF
C4
33nF
COMP
R3
4.75kΩ
C5
33nF
RESET
C8
1nF
C6
680pF
19-7053; Rev 2; 1/17
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