IC manufacturers Allegro Microsystems

IC manufacturers (95)

Allegro Microsystems A80605

High Power LED Driver with Pre-Emptive Boost for Ultra-High Dimming Ratio and Low Output Ripple

Overview

TopologySEPIC Buck-Boost Topology
Input voltage8-18 V
Output 114 V / 0.1 A
IC revision6

Description

The A80605 is a multi-output LED driver for automotive applications such as exterior lighting, heads-up display, and mid-size LCD backlighting. It implements a current-mode boost/SEPIC converter with gate driver for external N-channel MOSFET.The A80605 provides six integrated current sinks driving up to 140 mA per string. Multiple sinks can be paralleled together to achieve higher LED currents up to 840 mA. The IC operates from single power supply from 4.5 to 40 V; once started, it can continue to operate down to 4 V. This allows it to withstand stop/start, cold crank, and load dump conditions encountered in automotive systems.The A80605 can control LED brightness through an external PWM signal. By using the patented Pre-Emptive Boost control,an LED brightness contrast ratio of 15,000:1 can be achieved using PWM dimming at 200 Hz. A higher ratio of 150,000:1 is possible when using a combination of PWM and analog dimming.

Features

  • Automotive AEC-Q100 qualified
  • Enhanced fault handling for ASIL B system compliance
  • Wide input voltage range of 4.5 to 40 V for start/stop,cold crank, and load dump requirements
  • Operate in Boost or SEPIC mode for flexible output
  • Gate driver for external MOSFET to deliver higher output power
  • Six integrated LED current sinks, up to 140 mA each
  • Boost switching frequency synced externally or programmed from 260 kHz to 2.3 MHz
  • Programmable boost frequency dithering to reduce EMI
  • Advanced control allows minimum PWM on-time down to 0.3 μs, and avoids MLCC audible noises
  • LED contrast ratio: 15,000:1 at 200 Hz using PWM dimming alone, 150,000:1 when combining PWM and analog dimming

Typical applications

  • Automotive infotainment backlighting, Automotive heads-up display, Automotive interior and exterior lighting

Products

Order Code Data­sheet Simu­lation Downloads Product seriesL1
(µH)
L2
(µH)
nIR
(A)
IR 2
(A)
ISAT1
(A)
ISAT2
(A)
RDC1 typ
(mΩ)
RDC2 typ
(mΩ)
RDC1 max
(mΩ)
RDC2 max
(mΩ)
fres
(MHz)
LS
(µH)
Samples
7448990220SPEC
8 files WE-MCRI SMT Molded Coupled Inductor 22 22 1:1 3.4 3.4 8.1 8.1 95 95 106 106 6.5 0.335
Order Code Data­sheet Simu­lation
7448990220SPEC
Samples
Order Code Data­sheet Simu­lation Downloads Product seriesL1
(µH)
L2
(µH)
nIR
(A)
IR 2
(A)
ISAT1
(A)
ISAT2
(A)
RDC1 typ
(mΩ)
RDC2 typ
(mΩ)
RDC1 max
(mΩ)
RDC2 max
(mΩ)
fres
(MHz)
LS
(µH)
Samples