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MAX5073

2.2MHz, Dual-Output Buck or Boost Converter with Internal Power MOSFETs

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Overview

Description

The MAX5073 is a dual-output DC-DC converter with integrated high-side n-channel power MOSFETs. Each output can be configured either as a buck converter or a boost converter. The device is capable of operating from a wide 5.5V to 23V input voltage range. Each output is programmable down to 0.8V in the buck mode and up to 28V in the boost mode with an output voltage accuracy of ±1%. In the buck mode, converter 1 and converter 2 can deliver 2A and 1A, respectively. The output switching frequency of each converter can be programmed from 200kHz to 2.2MHz to avoid harmonics in a radio power supply or to reduce the size of the power supply. Each output operates 180° out-of-phase thus reducing input-capacitor ripple current, size, and cost. A SYNC input facilitates external frequency synchronization. Moreover, a CLKOUT output provides out-of-phase clock signal with respect to converter 2, allowing four-phase operation using two MAX5073 ICs in master-slave configuration.

The MAX5073 includes an internal digital soft-start that reduces inrush current, eliminates output-voltage overshoot, and ensures monotonic rise in output voltage during power-up. The device includes individual shutdown and a power-good output for each converter. Protection features include output short-circuit protection for buck mode and maximum duty-cycle limit for boost operation, as well as thermal shutdown.

The MAX5073 is available in a thermally enhanced 28-pin thin QFN package that can dissipate 2.7W at +70°C ambient temperature. The device is rated for operation over the -40°C to +85°C extended, or -40°C to +125°C automotive operating temperature range.

MAX5073: Functional Diagram

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Key Features

4.5V to 5.5V or 5.5V to 23V Input Supply Voltage Range
0.8V (Buck) to 28V (Boost) Output Voltage
Two Independent Output DC-DC Converters with Internal Power MOSFETs
Each Output can be Configured in Buck or Boost Mode
I_OUT1 and I_OUT2 of 2A and 1A (Respectively) in Buck Mode
180° Out-of-Phase Operation
Clock Output for Four Phase Operation
Switching Frequency Programmable from 200kHz to 2.2MHz
Digital Soft-Start and Sync Input
Individual Converter Shutdown and Power-Good Output
Short-Circuit Protection (Buck)/Maximum Duty-Cycle Limit (Boost)
Thermal Shutdown
Thermally Enhanced 28-Pin Thin QFN Package Dissipates up to 2.7W at +70°C

Applications/Uses

Networking Line Cards
Point-of-Load DC-DC Converters
Power-Over-Ethernet Postregulation for PDs
Telecom Line Cards

Parametric Specs

Part Number

V_IN
(V)

V_OUT1
(V)

Output Adjust. Method

I_OUT1
(A)

Switch Type

Power Good Signal

I_CC
(mA)

DC-DC Outputs

Oper. Freq.
(kHz)

Package/Pins

Budgetary
Price

min

max

min

max

typ

See Notes

MAX5073

5.5

0.8

Resistor

Internal

Yes

2.2

2200

TQFN/28

$3.11 @1k

See All Step-Down Switching Regulators (367)

Part Number

Package/Pins

MAX5073

See Data Sheet

See All Step-Up Switching Regulators (98)

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

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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Technical Docs

Type	ID	Title
Reference Schematic	4152	Reference Design for the MAX5073 Dual Buck Converter Operating at a Switching Frequency of 2MHz
App Note	3893	High-Frequency Automotive Power Supplies
App Note	3665	External Component Calculator for Setting up a Buck or Boost Converter with the MAX5072/MAX5073