MAX5080, MAX5081 1A, 40V, MAXPower Step-Down DC-DC Converters

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The MAX5080/MAX5081 are 250kHz PWM step-down DC-DC converters with an on-chip, 0.3 Ohm

high-side switch. The input voltage range is 4.5V to 40V for the MAX5080 and 7.5V to 40V for the MAX5081. The output is adjustable from 1.23V to 32V and can deliver up to 1A of load current.

Both devices utilize a voltage-mode control scheme for good noise immunity in the high-voltage switching environment and offer external compensation allowing for maximum flexibility with a wide selection of inductor values and capacitor types. The switching frequency is internally fixed at 250kHz and can be synchronized to an external clock signal through the SYNC input. Light load efficiency is improved by automatically switching to a pulse-skip mode.

All devices include programmable undervoltage lockout and soft-start. Protection features include cycle-by-cycle current limit, hiccup-mode output short-circuit protection, and thermal shutdown. Both devices are available in a space-saving, high-power (2.7W), 16-pin TQFN package and are rated for operation over the -40°C to +125°C temperature range.

Key Features

Applications/Uses

4.5V to 40V (MAX5080) or 7.5V to 40V (MAX5081) Input Voltage Range
1A Output Current
V_OUT Range From 1.23V to 32V
Internal High-Side Switch
Fixed 250kHz Internal Oscillator
Automatic Switchover to Pulse-Skip Mode at Light Loads
External Frequency Synchronization
Thermal Shutdown and Short-Circuit Protection
Operates Over the -40°C to +125°C Temperature Range
Space-Saving (5mm x 5mm) High-Power 16-Pin TQFN Package

	Automotive
	Distributed Power
	FireWire® Power Supplies
	Industrial

Key Specifications: Step-Down Switching Regulators

Part Number

V_IN (min) (V)

V_IN (max) (V)

Min. V_OUT (V)

Max. V_OUT (V)

I_OUT (A)

Output Adj. Method

Operating Current, I_CC (max) (mA)

Number of DC-DC Outputs

Operating Freq. (kHz)

Features

EV-Kit

Industry Qualified

Package

RoHS Available

Operating Temp. Range (°C)

Price^**

MAX5080

4.5

1.23

Resistor

2.5

250

•	Current Limit

•	External Synchronization

•	Fixed Frequency/ PWM Operation

•	Internal Power Switches

•

Shutdown

•	Soft Start

Automotive - General

THIN QFN/16

Yes

-40 to +125

$1.63 @ 1k

MAX5081

7.5

2.3

$1.63 @ 1k

See All Step-Down Switching Regulators (223)

Key Specifications: Switch-Mode DC-DC Power Supplies

Part Number

Topology

V_IN (min) (V)

V_IN (max) (V)

Number of DC-DC Outputs

Digital/VID Programmed Output

Min. Adjustable V_OUT (V)

Max. Adjustable V_OUT (V)

I_OUT (A)

Operating Current, I_CC (max) (mA)

Operating Freq. (kHz)

Internal Power Switch(es)

Industry Qualified

Package

Price^**

MAX5080

Step-Down

4.5

1.23

2.5

250

Yes

Automotive - General

THIN QFN/16

$1.63 @ 1k

MAX5081

7.5

2.3

$1.63 @ 1k

See All Switch-Mode DC-DC Power Supplies (429)

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 prices and delivery, please see the price and availability page or contact an authorized distributor.