MAX17545 Datasheet, PDF (1/19 Pages) Maxim Integrated Products – Synchronous Step-Down DC-DC Converter

MAX17545
EVALUATION KIT AVAILABLE
4.5V–42V, 1.7A, High-Efficiency,
Synchronous Step-Down DC-DC Converter
With Internal Compensation
General Description
The MAX17545 high-efficiency, high-voltage, synchronous
step-down DC-DC converter with integrated MOSFETs
operates over 4.5V to 42V input. The converter can deliver
up to 1.7A and generates output voltages from 0.9V up to
0.9 x V_IN. The feedback (FB) voltage is accurate to within
±1.1% over -40°C to +125°C.
The MAX17545 uses peak-current-mode control. The
device can be operated in pulse-width modulation (PWM),
pulse-frequency modulation (PFM), or discontinuous
conduction mode (DCM) control schemes.
The device is available in a 20-pin (4mm x 4mm) TQFN
package. Simulation models are available.
Applications
●● Industrial Power Supplies
●● Distributed Supply Regulation
●● High-Voltage Single-Board Systems
●● Base Station Power Supply
●● General-Purpose Point-of-Load
For related parts and recommended products to use with this part, refer
to www.maximintegrated.com/MAX17545.related.
Features and Benefits
●● 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
●● Reduces 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 > 90%
• PFM/DCM Enables Enhanced Light-load Efficiency
• 2.8µA Shutdown Current
●● Operates Reliably in Adverse Industrial Environments
• Peak Current-Limit Protection
• Built-in Output Voltage Monitoring with RESET
• Programmable EN/UVLO Threshold
• Monotonic Startup into Prebiased Load
• Overtemperature Protection
• -40°C to +125°C Operation
Ordering Information appears at end of data sheet.
Typical Application Circuit—5V, 500kHz Switching Frequency
C1
2.2µF
VIN
(6.5V TO 42V)
C2
2.2µF
EN/UVLO
RT
VIN VIN VIN
BST
SYNC
MODE
VCC
SGND
MAX17545
LX
LX
LX
FB
RESET
C5
0.1µF
L1
10µH
VOUT
5V, 1.7A
C4
22µF
R3
178kΩ
R4
39kΩ
CF
SS
C3
5.6nF
PGND PGND PGND
fSW = 500kHz
19-7056; Rev 0; 9/14