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MAX17576
4.5V to 60V, 4A, High-Efficiency,
Synchronous Step-Down DC-DC Converter
with Internal Compensation
General Description
Benefits and Features
● Reduces External Components and Total Cost
The MAX17576, high-efficiency, high-voltage, synchronous
step-down DC-DC converter with integrated MOSFETs
operates over an input voltage range of 4.5V to 60V.
The converter can deliver up to 4A current. Output voltage
• No Schottky-Synchronous Operation
• Internal Compensation for Any Output Voltage
• All-Ceramic Capacitors, Compact Layout
is programmable from 0.9V up to 90% of V . The feed-
IN
● Reduces Number of DC-DC Regulators to Stock
• Wide 4.5V to 60V Input
back voltage regulation accuracy over -40°C to +125°C
is ±0.9%. Built-in compensation across the output-voltage
range eliminates the need for external compensation
components.
• Adjustable Output Voltage Range from 0.9V up to
90% of V
IN
• Delivers up to 4A Current Over Temperature
• 100kHz to 2.2MHz Adjustable Switching Frequency
with External Synchronization
The MAX17576 features a peak-current-mode control
architecture. The device can operate either in constant-
frequency based pulse-width modulation (PWM) or 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. The MAX17576
offers a low minimum on time that allows high switching
frequencies and a small solution size.
● Reduces Power Dissipation
• Peak Efficiency of 94.8%
• 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 and Auto-Retry
Startup
The MAX17576 is available in a 24-pin (4mm x 5mm)
TQFN package. Simulation models are available.
• 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
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
Ordering Information appears at end of data sheet.
Typical Application Circuit
V
IN
R3
59kΩ
(4.5V-60V)
C1
2 x 4.7μF
EN/UVLO
MODE/SYNC
IN
BST
RT
C5
0.1μF
L1
5.6μH
V
OUT
3.3V, 4A
LX
CF
V
CC
C6
2.2μF
MAX17576
C3
2 x 47μF
R6
100kΩ
SGND
FB
FB
R7
SS
C8
5600pF
EXTVCC
PGND
37.4kΩ
f
= 350kHz
SW
L = XAL6060-562ME
C3 = C4 = GRM32ER71A476ME15
RESET
19-100399; Rev 0; 9/18