Analog Devices Inc./Maxim Integrated MAX5096BATE+

Overview

MAX5096BATE+ from Maxim Integrated is a dual-mode 40V, 600mA buck converter with integrated low-quiescent-current LDO mode, operating from 5V–40V (buck) or 4V–40V (LDO), delivering fixed 5V output with ±1.2% regulation over -40°C to +125°C, and featuring 135kHz switching frequency, 41μA typical quiescent current in LDO mode, and automotive-grade thermal protection.

For engineers reviewing the MAX5096BATE+ datasheet, MAX5096BATE+ pinout, MAX5096BATE+ application, or MAX5096BATE+ equivalent, this page delivers verified electrical parameters, validated 16-pin TQFN-EP package mapping, confirmed Dual Mode™ transition timing (100μs LDO entry, 32 clock cycles buck entry), and real-world design implications for automotive power rail sequencing and key-off current optimization.

Technical Context

The MAX5096BATE+ implements a current-mode PWM buck architecture with an internal 0.9Ω p-channel high-side switch and external freewheeling diode, enabling cycle-by-cycle current limiting and stable compensation across wide input ranges. Its Dual Mode™ operation uses separate error amplifiers and control paths for buck and LDO modes, sharing only the pass element and reference.

Mode selection is performed dynamically via the LDO/BUCK pin: logic-high (>2V) forces immediate LDO activation with 100μs delay, while logic-low initiates buck operation after 32 internal clock cycles. The internal 4V BP regulator powers all circuitry and enables UVLO with 3.65V threshold and 185mV hysteresis, ensuring monotonic startup down to 4V input.

Key Specifications

Pinout & Package

MAX5096BATE+ is housed in a thermally enhanced 16-pin TQFN-EP package (4mm × 4mm, 0.5mm pitch) with exposed pad connected to SGND for optimal heat transfer. The pinout supports full buck converter integration with external inductor/diode and independent LDO mode operation without additional components.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX5097BATE+, the MAX5096BATE+ offers lower EMI in AM-band-sensitive environments but requires larger magnetics; compared with TPS54340DDAR, it integrates mode switching, reset, and soft-start functions - reducing total solution size by 40% and eliminating three external ICs.

Availability

MAX5096BATE+ is available at Aetrix Electronics and suitable for automotive body electronics, infotainment subsystems, and industrial telematics requiring stable component supply, AEC-Q100-compliant performance, and long-term production continuity.

Supply support for MAX5096BATE+ 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) designs precision analog, mixed-signal, and power management ICs for automotive, industrial, and communications markets, with emphasis on high-reliability, low-power, and integrated-function solutions.

The MAX5096/MAX5097 product line was engineered specifically for automotive power systems needing seamless transition between high-efficiency switching and ultra-low-quiescent linear regulation - addressing key-off current, cold-crank robustness, and EMI constraints in modern vehicle ECUs.

FAQ

What output voltage does the MAX5096BATE+ deliver, and how is it configured?

The MAX5096BATE+ delivers a factory-trimmed fixed 5V output. It achieves this by internally connecting the ADJ pin to SGND - no external resistors are needed. When used in adjustable mode (by applying >125mV to ADJ), the output can be set from 1.24V to 11V using a resistor divider. The MAX5096BATE+ datasheet specifies 4.89V to 5.09V output accuracy across temperature and load in buck mode, and maintains regulation down to 4V input in LDO mode.

How does the MAX5096BATE+ switch between buck and LDO modes, and what are the timing requirements?

The MAX5096BATE+ switches modes via the LDO/BUCK pin: driving it high (>2V) activates LDO mode with a 100μs delay, while pulling it low initiates buck mode after exactly 32 internal clock cycles (~237μs at 135kHz). This deterministic timing enables precise microcontroller coordination during key-off/key-on transitions. Both modes share the same 5V output path and internal reference, ensuring seamless voltage continuity during mode change - critical for powering sensitive MCUs without brownout.

Can the MAX5096BATE+ be synchronized to an external clock, and what is its synchronization range?

Yes, the MAX5096BATE+ supports external synchronization via the SYNC pin, accepting input frequencies from 120kHz to 500kHz. This allows EMI reduction through frequency dithering or alignment with system clocks. When unused, SYNC must be tied to SGND. Unlike the MAX5097BATE+ (300kHz–500kHz sync range), the MAX5096BATE+'s lower sync floor (120kHz) preserves compatibility with legacy 125kHz or 133kHz master clocks commonly found in automotive domain controllers.

What thermal performance can be expected from the MAX5096BATE+ in its 16-pin TQFN-EP package?

In its 16-pin TQFN-EP package, the MAX5096BATE+ delivers 2.6W continuous power dissipation at TA = +70°C, with a junction-to-ambient thermal resistance (θ_JA) of 30.0°C/W. Its thermal shutdown activates at +165°C with 20°C hysteresis, allowing safe cycling during overload. For full 600mA output at +70°C ambient, a minimum 2cm² copper pour connected to the exposed pad is recommended - enabling operation without heatsink in most automotive under-hood applications.

Does the MAX5096BATE+ include built-in protection features, and how do they behave in both operating modes?

Yes, the MAX5096BATE+ integrates short-circuit, overload, and thermal shutdown protections active in both buck and LDO modes. Its current-limit protection operates differently per mode: in buck mode, it uses cycle-by-cycle peak current limiting (1.15A–1.9A); in LDO mode, it employs foldback current limiting triggered by output overload or short-circuit. The RESET output asserts low identically in both modes when VOUT drops below 90% of nominal, ensuring consistent MCU supervision regardless of active regulation mode.