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Maxim Integrated Semiconductor Electronic Components Datasheet

MAX17574 Datasheet

Synchronous Step-Down DC-DC Converter

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MAX17574
EVALUATION KIT AVAILABLE
4.5V to 60V, 3A, High-Efficiency,
Synchronous Step-Down DC-DC Converter
with Internal Compensation
General Description
The MAX17574, high-efficiency, high-voltage, synchronous
step-down DC-DC converter with integrated MOSFETs
operates over a 4.5V to 60V input. The converter can deliv­er up
to 3A current. Output voltage is programmable from 0.9V
up to 90%VIN. The feedback voltage regulation accuracy
over -40°C to +125°C is ±0.9%.
The MAX17574 features a peak-current-mode control
architecture. The device can be operated in the pulse-
width modulation (PWM), pulse-frequency modulation
(PFM), or discontinuous-conduction mode (DCM) control
schemes. A programmable soft-start feature allows users
to reduce input inrush current. The device also incorporates
an output enable/undervoltage lockout pin (EN/UVLO)
that allows the user to turn on the part at the desired
input voltage level. An open-drain RESET pin provides a
delayed power-good signal to the system upon achieving
successful regulation of the output voltage.
The MAX17574 is available in a 24-pin (4mm x 5mm)
TQFN package. Simulation models are available.
Applications
● Industrial Control Power Supplies
● General-Purpose Point-of-Load
● Distributed Supply Regulation
● Base Station Power Supplies
● Wall Transformer Regulation
● High-Voltage, Single-Board Systems
Benefits and Features
● Reduces External Components and Total Cost
• No Schottky-Synchronous Operation
• Internal Compensation for Any Output Voltage
• All-Ceramic Capacitors, Compact Layout
● Reduces Number of DC-DC Regulators to Stock
• Wide 4.5V to 60V Input
• Adjustable Output Voltage Range from 0.9V up to
90% of VIN
• Delivers up to 3A Current Over Temperature
• 100kHz to 2.2MHz Adjustable Switching Frequency
with External Synchronization
● Reduces Power Dissipation
Peak Efficiency > 90%
• PFM and DCM Modes Enable Enhanced
Light-Load Efficiency
Auxiliary Bootstrap LDO for Improved Efficiency
• 2.8µA Shutdown Current
● Operates Reliably in Adverse Industrial Environments
• Hiccup Mode Overload Protection
• Adjustable Soft-Start and Prebiased Power-Up
• Built-In Output-Voltage Monitoring with RESET
• Programmable EN/UVLO Threshold
• Monotonic Startup Into Prebiased Load
• Overtemperature Protection
• High Industrial -40°C to +125°C Ambient Operating
Temperature Range/-40°C to +150°C Junction
Temperature Range
Ordering Information appears at end of data sheet.
19-8635; Rev 3; 7/18


Maxim Integrated Semiconductor Electronic Components Datasheet

MAX17574 Datasheet

Synchronous Step-Down DC-DC Converter

No Preview Available !

MAX17574
4.5V to 60V, 3A, High-Efficiency,
Synchronous Step-Down DC-DC Converter
with Internal Compensation
Absolute Maximum Ratings
VIN to PGND..........................................................-0.3V to +65V
EN/UVLO to SGND................................................-0.3V to +65V
LX to PGND.................................................. -0.3V to VIN + 0.3V
EXTVCC to SGND.................................................-0.3V to +26V
BST to PGND.........................................................-0.3V to +70V
BST to LX..............................................................-0.3V to +6.5V
BST to VCC............................................................-0.3V to +65V
RESET, SS, MODE/SYNC,
VCC, RT, CF to SGND.......................................-0.3V to +6.5V
FB to SGND..........................................................-0.3V to +1.5V
PGND to SGND.....................................................-0.3V to +0.3V
LX Total RMS Current ...................................................... ±5.6A
Output Short-Circuit Duration .................................. Continuous
Continuous Power Dissipation (multilayer Board) (TA = +70°C,
derate 41.7mW/°C above +70°C.)..............................3333mW
Operating Temperature Range (Note 1)........... -40°C to +125°C
Junction Temperature .................................................... +150°C
Storage Temperature Range ............................ -65°C to +150°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; 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: 24 TQFN
Package Code
T2445+2C
Outline Number
21-0201
Land Pattern Number
90-0083
THERMAL RESISTANCE, FOUR-LAYER BOARD (Note 2)
Junction to Ambient (θJA)
Junction to Case (θJC)
24°C/W
1.8°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.
Note 1: Junction temperature greater than +125°C degrades operating lifetimes.
Note 2: Package thermal resistances were obtained using the MAX17574 evaluation kit with no airflow.
www.maximintegrated.com
Maxim Integrated 2


Part Number MAX17574
Description Synchronous Step-Down DC-DC Converter
Maker Maxim Integrated
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MAX17574 Datasheet PDF






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