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MAX17543

4.5V-42V, 2.5A, High-Efficiency, Synchronous Step-Down DC-DC Converter with Internal Compensation

Wide Input Voltage, 2.5A Internal FET Synchronous Buck Converter Ideal for Industrial Applications

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Overview

Description

The MAX17543 high-efficiency, high-voltage, synchronous step-down DC-DC converter with integrated MOSFETs operates over a 4.5V to 42V input. The converter can deliver up to 2.5A 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 MAX17543 uses peak current-mode control. The device can be operated in the pulse-width modulation (PWM), pulse-frequency modulation (PFM), or discontinuous conduction mode (DCM) control schemes.

The device is available in a 20-pin (4mm × 4mm) TQFN package. Simulation models are available.

MAX17543: Block Diagram

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Key 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
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 Active-Low 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/Uses

Base Station Power Supply
Distributed Supply Regulation
General-Purpose Point-of-Load
High-Voltage Single-Board Systems
Industrial Power Supplies

Parametric Specs

Part Number

V_IN
(V)

V_OUT1
(V)

Output Adjust. Method

I_OUT1
(A)

Switch Type

Synchronous Switching

Power Good Signal

DC-DC Outputs

Oper. Freq.
(kHz)

Design Tools

Package/Pins

Budgetary
Price

min

max

min

max

See Notes

MAX17543

4.5

0.9

Resistor

2.5

Internal

Yes

2200

EE-Sim

TQFN-CU/20

$1.67 @1k

See All Step-Down Switching Regulators (404)

Pricing Notes:

This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific and version-specific prices and delivery, please see the price and availability page or contact an authorized distributor.

Design Resources

MAX17543EVKITA: Evaluation Kit for the MAX17543 in 3.3V Output-Voltage Application
MAX17543EVKITB: Evaluation Kit for the MAX17543 in 5V Output-Voltage Application

Quality And Environmental

Device	Fab Process	Technology	Sample size	Rejects	FIT at 25°C	FIT at 55°C

Note : The failure rates are summarized by technology and mapped to the associated material part numbers. The failure rates are highly dependent on the number of units tested.

Quality Management System >
Environmental Management System >

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Type	ID	PDF	Title
User Guide	5861		EE-SIM Design and Simulation Environment User Guide

Technical Docs

Reference Designs

Type	ID	Title
Evaluation Board	8628	MAX17543EVKITB Evaluation Kit for the MAX17543 in 5V Output-Voltage Application
Evaluation Board	8553	MAX17543EVKITA Evaluation Kit for the MAX17543 in 3.3V Output-Voltage Application