Analog Devices Inc./Maxim Integrated MAX16834ATP/V+T

Overview

MAX16834ATP/V+T from Maxim Integrated is a current-mode high-brightness LED driver IC supporting boost, boost-buck, SEPIC, and high-side buck topologies. It integrates a 3A gate driver for external n-channel power MOSFETs, a dedicated 50mA PWM dimming MOSFET driver (DIMOUT), and a high-side LED current-sense amplifier with 9.9V/V gain. It delivers 3000:1 PWM dimming up to 20kHz and operates from 4.75V to 28V input, targeting automotive front/rear lighting and LCD backlighting.

For engineers reviewing the MAX16834ATP/V+T datasheet, MAX16834ATP/V+T pinout, MAX16834ATP/V+T application, or MAX16834ATP/V+T equivalent, key selection criteria include its programmable 100kHz–1MHz switching frequency, integrated slope compensation, true differential overvoltage protection (OVP+), thermal warning flag (FLT), and dual linear regulators (7V VCC and 5V CLV) - all validated for -40°C to +125°C automotive operation.

Technical Context

The MAX16834ATP/V+T implements constant-frequency peak current-mode control with externally programmable slope compensation via capacitor on SC pin, enabling stable operation across wide duty cycles in boost-buck and SEPIC configurations. Its transconductance error amplifier (500μS typical) interfaces directly with REFI for analog dimming and uses COMP as feedback node with RC compensation.

It features two independent gate drivers: NDRV (3A sink/source, 0.9Ω n-channel RDSON) for the main switching MOSFET, and DIMOUT (50mA sink/source, 25Ω n-channel RDSON) for series PWM dimming MOSFETs. Fault management includes active-low open-drain FLT output asserting on LED open/short, overvoltage (>1.435V at OVP+), or thermal warning (>140°C).

Key Specifications

Availability

MAX16834ATP/V+T is available at Aetrix Electronics and suitable for automotive front lighting, LCD backlighting, and projection system RGB LED drivers requiring stable component supply across extended temperature and voltage ranges.

Supply support for MAX16834ATP/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) designs precision analog, mixed-signal, and power management ICs for automotive, industrial, and communications applications.

The MAX16834 product line targets high-reliability HB LED driver systems requiring integrated current sensing, wide-range dimming, and robust fault protection - specifically optimized for boost-buck and high-side buck topologies in harsh environments.

FAQ

What topology configurations does the MAX16834ATP/V+T support?

The MAX16834ATP/V+T supports boost, boost-buck, SEPIC, and high-side buck topologies. Its LV pin configuration determines mode: connect LV to SGND for boost/SEPIC, or to IN for boost-buck/high-side buck. The integrated high-side current-sense amplifier eliminates external sense amps in boost-buck applications, reducing BOM count and layout complexity for MAX16834ATP/V+T designs.

How is PWM dimming implemented on the MAX16834ATP/V+T?

MAX16834ATP/V+T implements PWM dimming via the PWMDIM input (1.435V threshold) controlling the DIMOUT gate driver, which sinks/sourses ±50mA to drive an external n-channel MOSFET in series with the LED string. This enables 3000:1 dimming ratio up to 20kHz. The IC also supports analog dimming via DC voltage applied to REFI, allowing hybrid dimming schemes in MAX16834ATP/V+T-based systems.

What protection features are built into the MAX16834ATP/V+T?

MAX16834ATP/V+T includes programmable UVLO (via UVEN pin), true differential overvoltage protection (OVP+ with 1.435V threshold), LED short/open detection, and thermal warning (>140°C). Faults trigger active-low open-drain FLT output, which asserts for overvoltage, overcurrent, or thermal events. Hiccup-mode recovery (8.2ms) handles persistent short-circuit conditions without latch-off, enhancing system reliability in MAX16834ATP/V+T deployments.

What are the key differences between the TQFN-EP and TSSOP-EP packages for MAX16834ATP/V+T?

MAX16834ATP/V+T is offered in both 4mm × 4mm 20-pin TQFN-EP and 20-pin TSSOP-EP packages, both thermally enhanced with exposed pads. The TQFN-EP has θJA = 39°C/W and θJC = 6°C/W; the TSSOP-EP has θJA = 37.7°C/W and θJC = 2°C/W. While both are rated for -40°C to +125°C, the TSSOP-EP offers slightly better junction-to-case thermal resistance, making it preferable for higher ambient or sustained power dissipation in MAX16834ATP/V+T applications.

Can the MAX16834ATP/V+T operate above 28V input?

Yes - MAX16834ATP/V+T can operate with input voltages >28V in boost configuration when an external voltage clamp limits VIN to ≤28V. The absolute maximum rating for IN, HV, and LV pins is +30V relative to SGND, and the device's internal circuitry remains functional as long as clamped VIN stays within safe operating area. This capability extends MAX16834ATP/V+T usability in 36V automotive load-dump scenarios.