Analog Devices Inc./Maxim Integrated MAX8559ETADK+

Overview

MAX8559ETADK+ from Maxim Integrated is a dual, low-noise, low-dropout linear regulator delivering 300mA per channel from 2.5V–6.5V input, with 32µVRMS output noise, 60mV dropout at 100mA, and independent logic-controlled shutdown inputs-designed for power-sensitive portable electronics such as digital cameras and wireless LAN cards.

For engineers reviewing the MAX8559ETADK+ datasheet, MAX8559ETADK+ pinout, MAX8559ETADK+ application, or MAX8559ETADK+ equivalent, key selection criteria include factory-preset 1.5V–3.3V dual outputs, UCSP/TDFN package compatibility, thermal-shutdown behavior at +160°C, and PSRR of 70dB at 10kHz under 50mA load with 0.01µF BP bypass.

Technical Context

The MAX8559ETADK+ integrates two independent P-channel MOSFET pass transistors (0.6Ω R_DS(ON)) with internal 1.25V bandgap reference and error amplifiers, enabling precise feedback control without external resistors. Each LDO features autodischarge circuitry (385Ω internal pull-down in shutdown) and independent current limiting (310mA min).

Its low-quiescent operation (115µA per LDO at no load) stems from P-MOS architecture eliminating base-drive current, while BP pin filtering enables sub-32µVRMS noise performance with 0.01µF ceramic capacitor-distinct from standard LDOs requiring larger bypass networks.

Key Specifications

Pinout & Package

MAX8559ETADK+ is supplied in an 8-pin TDFN-EP package (3mm × 3mm, 0.8mm height) with exposed paddle for thermal dissipation. Pin 1 is marked by a "+" sign on lead-free variants.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS70245PWPR and ADP1720ARMZ-1.8-R7, the MAX8559ETADK+ uniquely delivers 300mA dual outputs in a 3mm×3mm TDFN with integrated BP noise reduction and 0.01µA shutdown-making it optimal for space-constrained, noise-sensitive portable designs requiring coordinated rail sequencing.

Availability

MAX8559ETADK+ is available at Aetrix Electronics and suitable for digital cameras, wireless LAN cards, and handheld instruments requiring stable component supply with guaranteed long-term manufacturability and consistent electrical performance across production lots.

Supply support for MAX8559ETADK+ 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) is a U.S.-based semiconductor company specializing in high-performance analog, mixed-signal, and power-management ICs for industrial, communications, and consumer applications.

The MAX8559 belongs to Maxim's low-noise, low-I_Q linear regulator product line, engineered specifically for battery-powered portable electronics where extended runtime, compact footprint, and clean power delivery are critical design constraints.

FAQ

What output voltage options are available for the MAX8559ETADK+?

The MAX8559ETADK+ is a factory-preset variant with fixed dual outputs: OUTA = 2.85V and OUTB = 2.85V, indicated by top-mark "AAC". It is part of the broader MAX8559 family offering 1.5V–3.3V combinations (e.g., 1.8V/3.0V, 2.5V/1.8V), but the ETADK+ suffix specifically denotes the 2.85V/2.85V configuration. No external feedback resistors are needed, simplifying layout and reducing component count.

Does the MAX8559ETADK+ require a bypass capacitor on the BP pin?

The MAX8559ETADK+ does not require the 0.01µF BP capacitor for basic regulation, but its inclusion reduces output noise from 254µVRMS to 32µVRMS (100Hz–100kHz). For noise-sensitive applications like camera sensors or RF receivers, the BP capacitor is strongly recommended. Omitting it saves board space and cost but sacrifices low-noise performance-designers must validate noise margins in final system testing.

How does the MAX8559ETADK+ behave during thermal overload?

During thermal overload, the MAX8559ETADK+ activates independent thermal sensors per LDO. When junction temperature exceeds +160°C, the affected LDO's pass transistor shuts off until temperature drops by 10°C hysteresis. This results in pulsed output rather than complete shutdown, allowing partial system functionality. The exposed paddle in the TDFN-EP package must be soldered to the PCB ground plane to maximize thermal dissipation and delay trip onset.

Can the MAX8559ETADK+ operate with ceramic output capacitors smaller than 4.7µF?

Yes-the MAX8559ETADK+ is optimized for ceramic capacitors and remains stable with 2.2µF output capacitance for loads ≤150mA. For full 300mA capability across -40°C to +85°C, a minimum 4.7µF ceramic capacitor (X5R/X7R dielectric) is required. Z5U/Y5V types may need ≥4.7µF even at 150mA due to capacitance roll-off at low temperatures. Stability is unaffected by ESR, unlike tantalum-based LDOs.

What is the maximum power dissipation of the MAX8559ETADK+ in its TDFN package?

The MAX8559ETADK+ in 8-pin TDFN-EP package has a maximum continuous power dissipation of 1951mW at +70°C ambient, derating by 24.4mW/°C above that temperature. This assumes proper thermal design: exposed paddle soldered to ≥1in² copper area. In contrast, the UCSP variant is limited to 379mW. Power dissipation is calculated as P = I_OUTA(V_IN−V_OUTA) + I_OUTB(V_IN−V_OUTB); exceeding PMAX triggers thermal shutdown.