MAX17546 Datasheet, PDF (1/19 Pages) Maxim Integrated Products – 4.5V–42V, 5A, High-Efficiency, Synchronous Step-Down DC-DC Converter with Internal Compensation

MAX17546
4.5V–42V, 5A, High-Efficiency, Synchronous
Step-Down DC-DC Converter
with Internal Compensation
General Description
The MAX17546 high-efficiency, high-voltage, synchronous
step-down DC-DC converter with integrated high-side
MOSFET operates over a 4.5V to 42V input. The
converter can deliver up to 5A and generates output
voltages from 0.9V up to 0.9 x V_IN. The feedback (FB)
voltage is accurate to within ±1.4% over -40°C to 125°C.
The MAX17546 uses peak current-mode control. The
device can be operated in the pulse-width modulation
(PWM), pulse-frequency modulation (PFM), and
discontinuous conduction mode (DCM) control schemes.
The device is available in a 20-pin (5mm x 5mm) Thin
QFN (TQFN) package. Simulation models are available.
Applications
● Industrial Power Supplies
● Distributed Supply Regulation
● Base Station Power Supplies
● Wall Transformer Regulation
● High-Voltage Single-Board Systems
● General-Purpose Point-of-Load
Ordering Information appears at end of data sheet.
Benefits and Features
● Reduces External Components and Total Cost
• No Schottky-Synchronous Operation
• Internal Compensation for Any Output Voltage
• Built-In Soft-Start
• All-Ceramic Capacitors, Compact Layout
● Reduce Number of DC-DC Regulators to Stock
• Wide 4.5V to 42V Input
• Adjustable 0.9V to 0.9 x V_IN Output
• 100kHz to 2.2MHz Adjustable Switching Frequency
with External Synchronization
● Reduces Power Dissipation
• Peak Efficiency > 95%
• PFM/DCM Modes Enable Enhanced Light-Load
Efficiency
• Auxiliary Bootstrap LDO for Improved Efficiency
• 3.5FA Shutdown Current
● Operates Reliably in Adverse Industrial Environments
• Hiccup or Latchoff Mode Overload Protection
• DL to LX Short Detection Feature
• Built-In Output Voltage Monitoring with RESET
• Programmable EN/UVLO Threshold
• Monotonic Startup into Prebiased Load
• Overtemperature Protection
• -40NC to +125NC Operation
Typical Application Circuit for 5V Output
VIN
7.5V-42V
C6
2.2μF
EN/UVLO VIN VIN VIN VIN
RT
BST
MODE /SYNC
VCC
LX
SGND
MAX17546
LX
LX
CF
RESET
DL
C11
0.1μ F
SS
PGND
EXTVCC FB
C1
2.2μF
C2
2.2μF
L1
4.7μH
C8
N1
22μ F
C9
22μF
C7
0.022μ F
C10
22μF
FSW = 450kHz
VOUT
5V, 5A
R3
158 k
R4
34.8k
L1 = XAL8080-472
N1 = RJK0651DPB
19-7665; Rev 0; 6/15