Analog Devices Inc. ADD5203ACPZ-RL

Overview

ADD5203ACPZ-RL from Analog Devices is an 8-string white LED driver IC for LCD backlight systems, featuring an integrated 50 V/2.9 A MOSFET boost converter, SMBus and PWM dimming interfaces, ±1.5% current matching across strings, and adjustable LED current up to 30 mA per channel - deployed in notebook PCs and monitor displays.

For engineers reviewing the ADD5203ACPZ-RL datasheet, ADD5203ACPZ-RL pinout, ADD5203ACPZ-RL application, or ADD5203ACPZ-RL equivalent, key selection criteria include input voltage range (6–21 V), programmable switching frequency (350 kHz–1 MHz), OVP threshold (typ. 47.5 V), thermal shutdown (160°C), and 28-lead LFCSP_WQ package compatibility with high-density PCB layouts.

Technical Context

The ADD5203ACPZ-RL implements a current-mode, step-up DC/DC regulator with internal 0.15 Ω MOSFET and soft-start (1.5 ms). Its eight regulated current sinks operate with headroom control to minimize power loss while maintaining ±1.5% string-to-string matching at 20 mA.

Dimming is supported via three selectable modes - fixed-delay PWM, no-delay PWM, or DC current - each configurable using SEL1/SEL2 pins and offering 8-bit resolution (256 steps). SMBus interface enables register-based brightness control (0x00), fault monitoring (0x02), and device identification (0x03) at 10–100 kHz clock rates.

Key Specifications

Pinout & Package

Package: 28-lead, 4 mm × 4 mm × 0.75 mm LFCSP_WQ with exposed paddle (EP) soldered to GND for thermal performance (θ_JA = 32.6°C/W).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar white LED driver applications.

Compared with LM3409MY/NOPB and TPS61165DRVR, the ADD5203ACPZ-RL uniquely integrates eight matched current sinks, SMBus register access, and headroom control - delivering superior uniformity, system visibility, and efficiency in multi-string LCD backlighting where reliability and software controllability are critical.

Availability

ADD5203ACPZ-RL is available at Aetrix Electronics and suitable for notebook PCs, monitor displays, and UMPCs requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for ADD5203ACPZ-RL 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

Analog Devices is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, headquartered in Norwood, MA.

The ADD5203ACPZ-RL belongs to Analog Devices' precision LED driver product line, engineered specifically for high-efficiency, multi-string LCD backlighting in portable and display applications demanding tight current matching and robust fault protection.

FAQ

What is the maximum number of LED strings the ADD5203ACPZ-RL can drive?

The ADD5203ACPZ-RL drives up to eight independent LED current strings simultaneously, with each string capable of sinking up to 30 mA. All eight FBx pins (FB1–FB8) are active current-sink outputs; unused pins must be connected to ground to ensure proper biasing and thermal stability in the ADD5203ACPZ-RL.

How does the ADD5203ACPZ-RL achieve ±1.5% current matching between strings?

The ADD5203ACPZ-RL achieves ±1.5% current matching through precision-matched internal current source circuitry and shared reference architecture. This specification is tested at 20 mA with R_SET = 141.56 kΩ and applies across the industrial temperature range (−25°C to +85°C), ensuring consistent brightness in the ADD5203ACPZ-RL's multi-string backlight implementation.

Can the ADD5203ACPZ-RL operate with input voltages below 6 V?

Yes - the ADD5203ACPZ-RL functions down to 5.6 V (typical UVLO rising threshold), though its specified operating range is 6 V to 21 V. Operation below 6 V may reduce available output headroom and affect regulation stability; full specifications apply only within the rated 6–21 V range for the ADD5203ACPZ-RL.

What protection features are built into the ADD5203ACPZ-RL?

The ADD5203ACPZ-RL includes overvoltage protection (OVP), undervoltage lockout (UVLO), thermal shutdown (160°C), LED open/short fault detection per string, and internal soft start. Each protection mechanism operates autonomously - for example, an open LED string disables only that FBx channel while others remain active, preserving partial backlight functionality in the ADD5203ACPZ-RL.

Is the ADD5203ACPZ-RL pin-compatible with other members of the ADD52xx family?

No - the ADD5203ACPZ-RL is not pin-compatible with other ADD52xx variants (e.g., ADD5202 or ADD5204), as differences in feature set, pin count, and function allocation prevent direct substitution. The 28-lead LFCSP_WQ footprint and specific pin assignments (e.g., dual SW pins, dedicated R_FPWM/C_FPWM) are unique to the ADD5203ACPZ-RL.