Analog Devices Inc. ADP8861ACBZ-R7

Overview

ADP8861ACBZ-R7 from Analog Devices is a 7-channel smart LED driver IC with integrated charge pump, I²C interface, and independent programmable current sinks-six channels rated at 30 mA (typ), one channel extendable to 60 mA (typ), automatic gain selection (1×/1.5×/2×), and <1 μA standby current. It targets mobile display and keypad backlighting where compact size, low quiescent power, and precise fade timing are critical.

For engineers reviewing the ADP8861ACBZ-R7 datasheet, ADP8861ACBZ-R7 pinout, ADP8861ACBZ-R7 application, or ADP8861ACBZ-R7 equivalent, key selection criteria include its 20-ball WLCSP package (2.15 mm × 2.36 mm), 16-step programmable fade timing (0.1–5.5 s), 128-level current control, short-circuit/overvoltage/overtemperature protection, and dual-capacitor charge pump architecture supporting VIN = 2.5 V to 5.5 V.

Technical Context

The ADP8861ACBZ-R7 implements a two-capacitor switched-capacitor charge pump with automatic gain switching between 1×, 1.5×, and 2× based on real-time current sink headroom voltage (VHR ≥ 180 mV). Gain transitions occur only after 100 μs stabilization delay and ignore inactive LED channels.

Its I²C interface supports 400 kHz operation with dedicated nRST and nINT pins, while seven independent current sinks are controlled via registers enabling group fading, linear/square/cubic fade profiles, and per-LED maximum current limits (26.2–34.1 mA typical for D1–D6; 52.5–67 mA for D7 in 60 mA mode).

Key Specifications

Pinout & Package

ADP8861ACBZ-R7 is packaged in a 20-ball, 2.15 mm × 2.36 mm × 0.6 mm Wafer-Level Chip Scale Package (WLCSP) with exposed paddle connected to GND1/GND2. Pin mapping follows ball-grid layout (A1–E4) with dedicated charge pump capacitor terminals (C1+, C1−, C2+, C2−), seven LED sink outputs (D1–D7), and dual ground pins (GND1, GND2).

Key Features

Applications

Equivalent & Alternatives

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

Compared with LM3530TMX/NOPB and MAX16984ATL+T, the ADP8861ACBZ-R7 uniquely combines 7-channel flexibility, dual-mode (30/60 mA) sink capability, and adaptive charge pump efficiency across 2.5 V–5.5 V, making it optimal for space-constrained, battery-powered consumer devices demanding precise fade control and minimal standby leakage.

Availability

ADP8861ACBZ-R7 is available at Aetrix Electronics and suitable for mobile display backlighting, keypad illumination, dual RGB backlighting, and LED indication requiring stable component supply across high-mix, low-volume production runs.

Supply support for ADP8861ACBZ-R7 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, serving precision instrumentation, industrial automation, communications, and automotive markets.

The ADP8861 belongs to Analog Devices' smart backlight driver product line, designed specifically for energy-efficient, software-configurable LED control in portable consumer electronics with stringent size and power constraints.

FAQ

What is the maximum total output current supported by the ADP8861ACBZ-R7?

The ADP8861ACBZ-R7 supports a maximum total output current of 240 mA. This is achieved by driving six LED channels at 30 mA (typical) each and the seventh channel at 60 mA (typical), all simultaneously. The device's charge pump and thermal design ensure stable operation within this limit across the full −40°C to +85°C ambient range.

Does the ADP8861ACBZ-R7 require external flying capacitors, and what values are specified?

Yes, the ADP8861ACBZ-R7 requires two external ceramic flying capacitors: one for the C1 path (C1+ and C1−) and one for the C2 path (C2+ and C2−). The datasheet specifies 1 μF for both capacitors, and they must be placed close to the respective pins to maintain charge pump stability and minimize EMI. X5R or X7R dielectrics with 10% tolerance are recommended.

How does automatic gain selection work in the ADP8861ACBZ-R7, and what triggers a gain change?

Automatic gain selection in the ADP8861ACBZ-R7 monitors the minimum voltage headroom (VHR) across all *active* LED current sinks. If VHR falls below 180 mV (typ), the charge pump increases gain (e.g., 1× → 1.5×) after a 100 μs stabilization delay. Conversely, if headroom exceeds the internally calculated VDMAX threshold, gain reduces to improve efficiency. Inactive sinks are ignored during evaluation.

Can the ADP8861ACBZ-R7 drive LEDs with forward voltages exceeding 4.5 V?

Yes, the ADP8861ACBZ-R7 can drive LEDs with forward voltages up to ~5.3 V when operating in 2× gain mode (VOUT(REG) = 4.3–5.5 V at 10 mA). With VIN = 2.5 V, the 2× charge pump generates sufficient output to bias typical white or blue LEDs. However, total current must remain within thermal limits-higher Vf reduces available headroom and may trigger gain transitions or thermal shutdown under sustained load.

What protection features are integrated into the ADP8861ACBZ-R7?

The ADP8861ACBZ-R7 integrates short-circuit protection (VOUT(SC) = 0.55 × VIN), overvoltage protection (VOVP = 5.8 V with 500 mV hysteresis), overtemperature shutdown (TSD = 150 °C with 20 °C hysteresis), and input-to-output isolation during faults. These features operate autonomously without MCU supervision, ensuring robust operation in unattended or safety-critical lighting applications.