Analog Devices Inc./Maxim Integrated MAX5097BATE/V+T

Overview

MAX5097BATE/V+T from Maxim Integrated is a dual-mode 40V, 600mA buck converter with integrated low-quiescent-current LDO mode, operating in 330kHz PWM switch-mode or 41μA IQ LDO mode. It delivers fixed 5V output (±1.2% regulation), supports 5V–40V buck input and 4V–40V LDO input, and features programmable soft-start, thermal/short-circuit protection, and automotive-grade -40°C to +125°C operation - used in vehicle infotainment power rails requiring ultra-low standby current.

For engineers reviewing the MAX5097BATE/V+T datasheet, MAX5097BATE/V+T pinout, MAX5097BATE/V+T application, or MAX5097BATE/V+T equivalent, key selection criteria include its dual-mode transition timing (100μs LDO→Buck, 32 clock cycles Buck→LDO), 330kHz fixed switching frequency, 0.9Ω internal p-channel MOSFET R_DS(ON), 6μA shutdown current, and compatibility with external synchronization up to 500kHz.

Technical Context

The MAX5097BATE/V+T implements current-mode PWM control in buck mode with external compensation via COMP pin, enabling stable loop design across wide input/output conditions. Its dual-mode architecture shares the same internal p-channel pass element and reference but uses separate error amplifiers - one optimized for high-efficiency switching, the other for low-noise linear regulation.

Mode selection is controlled by the LDO/BUCK pin: logic-high (>2V) forces LDO operation with 100mA max output and 41μA quiescent current at 100μA load; logic-low enables 600mA buck operation with 85% efficiency at 14V→5V/400mA. The BP pin supplies a regulated 4V internal rail for biasing, while SYNC accepts external clocks from 300kHz to 500kHz for EMI reduction.

Key Specifications

Pinout & Package

MAX5097BATE/V+T is housed in a thermally enhanced 16-pin TQFN-EP package (3mm × 3mm, 0.5mm pitch) with exposed pad for PCB-level heat sinking. The package supports 2.6W continuous power dissipation at +70°C ambient and meets JEDEC JESD51-7 thermal standards (θ_JA = 30.0°C/W).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual-mode DC-DC regulator applications.

Compared with MAX5096BATE+, MAX5097BATE/V+T provides 2.4× higher switching frequency for smaller magnetics, while versus TPS54340DDAR it integrates mode control, reset, and soft-start - reducing total solution size by 40% and eliminating 7 external components.

Availability

MAX5097BATE/V+T is available at Aetrix Electronics and suitable for automotive body electronics, infotainment subsystems, and telematics modules requiring stable component supply across extended temperature and long product lifecycles.

Supply support for MAX5097BATE/V+T includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Maxim Integrated (now part of Analog Devices) is a semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for automotive, industrial, and communications markets.

The MAX5096/MAX5097 product line was designed specifically for automotive power systems needing ultra-low quiescent current in sleep mode without sacrificing high-efficiency performance during active operation - addressing key challenges in modern vehicle electrical architectures.

FAQ

What is the key functional difference between MAX5097BATE/V+T and MAX5096BATE+?

The MAX5097BATE/V+T operates at a fixed 330kHz switching frequency, enabling smaller external inductors and capacitors, while the MAX5096BATE+ runs at 135kHz - chosen for lower EMI in AM radio-sensitive applications. Both share identical pinout, dual-mode logic, 5V fixed output, and automotive temperature rating, but MAX5097BATE/V+T achieves better power density at the cost of higher fundamental frequency.

How does the LDO/BUCK pin control mode transitions in MAX5097BATE/V+T?

The LDO/BUCK pin on MAX5097BATE/V+T directly selects operating mode: driving it high (>2V) activates LDO mode with 41μA quiescent current, while pulling it low enables 330kHz buck operation delivering up to 600mA. Transition from LDO to buck takes 100μs; buck to LDO occurs after 32 internal clock cycles - enabling precise MCU-controlled sequencing during vehicle key-off/on events.

Can MAX5097BATE/V+T be synchronized to an external clock, and what is the valid frequency range?

Yes, MAX5097BATE/V+T supports external synchronization via the SYNC pin over 300kHz to 500kHz. This allows EMI reduction through frequency dithering or alignment with system clocks. When unused, SYNC must be tied to SGND. Unlike MAX5096, the MAX5097 variant cannot synchronize below 300kHz due to internal oscillator architecture.

What thermal performance can be expected from MAX5097BATE/V+T in its 16-pin TQFN package?

In its 16-pin TQFN-EP package, MAX5097BATE/V+T delivers 2.6W continuous power dissipation at +70°C ambient (θ_JA = 30.0°C/W). With proper PCB copper pour under the exposed pad, it maintains safe junction temperatures up to +125°C ambient in buck mode at full 600mA load - validated per JEDEC JESD51-7 four-layer board standards.

Does MAX5097BATE/V+T support adjustable output voltages, or is it fixed at 5V only?

MAX5097BATE/V+T is configured for fixed 5V output (MAX5097B variant), achieved by grounding the ADJ pin. While the underlying MAX5097 architecture supports adjustable outputs (1.24V–11V) via resistor divider on ADJ, the MAX5097BATE/V+T variant is factory-trimmed and specified only for 5V operation - using ADJ for adjustment voids guaranteed specifications and is not recommended.