Analog Devices Inc. LTM4709IY#PBF

Overview

LTM4709IY#PBF from Analog Devices is a triple-output, 3A-per-channel µModule linear regulator delivering ultralow 1.3μVRMS noise (10Hz–100kHz), 51dB PSRR at 1MHz, and 45mV typical dropout at 3A. It integrates LDOs, capacitors, and resistors in a single BGA package and serves as post-regulator for FPGA core supplies, RF signal chains, and high-precision data converters.

For engineers reviewing the LTM4709IY#PBF datasheet, LTM4709IY#PBF pinout, LTM4709IY#PBF application, or LTM4709IY#PBF equivalent, key selection criteria include configurable 0.5V–4.2V output per channel, ±1.5% output regulation over line/load/temperature, precision ±2.4% current monitoring, and thermal performance up to 125°C junction temperature.

Technical Context

The LTM4709IY#PBF implements three independent N-channel source-follower LDOs with integrated bias supply circuitry, each supporting digitally programmable output voltage via tri-state VOx0/VOx1/VOx2 pins. Its architecture enables ultrafast transient response without external bulk capacitance-only 10μF ceramic output capacitors are required per channel.

Each channel features dedicated IMON current monitor pins with internal 909Ω resistor to IMONR, enabling accurate current sensing (IOUT/IMON = 3000) and programmable current limiting. Fault protection includes UVLO on BIAS pins, open-drain PG flags with 91%/88% VOUT threshold hysteresis, overcurrent foldback, and thermal shutdown at 168°C typical.

Key Specifications

Pinout & Package

The LTM4709IY#PBF is housed in a 98-pin BGA package measuring 6mm × 12mm × 1.92mm with 0.8mm ball pitch and RoHS-compliant SAC305 finish. Thermal resistance θJCbottom = 3°C/W enables efficient bottom-side heat transfer to PCB copper.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LTM4709EY#PBF and LTM4709HY#PBF, the LTM4709IY#PBF provides guaranteed –40°C to 125°C operation without the higher cost or thermal derating constraints of the H-grade variant, making it optimal for mainstream industrial and embedded computing designs where extended low-temperature startup and mid-range thermal margin are critical.

Availability

LTM4709IY#PBF is available at Aetrix Electronics and suitable for FPGA power delivery, RF transceiver biasing, high-speed data converter supplies, and medical imaging subsystems requiring stable component supply across long production lifecycles.

Supply support for LTM4709IY#PBF 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, Inc. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets.

The LTM4709IY#PBF belongs to Analog Devices' µModule regulator product line, engineered to replace complex discrete LDO designs with fully integrated, thermally optimized power solutions for space-constrained, noise-sensitive, high-current applications.

FAQ

What is the maximum output current per channel for the LTM4709IY#PBF?

The LTM4709IY#PBF delivers up to 3A per channel across its three independent outputs. When paralleled, multiple LTM4709IY#PBF devices can deliver up to 9A total output current. The device maintains 45mV typical dropout voltage at 3A per channel, enabling efficient operation with minimal input–output differential.

How is output voltage configured on the LTM4709IY#PBF?

Output voltage on the LTM4709IY#PBF is configured digitally using tri-state VOx0/VOx1/VOx2 pins per channel (e.g., VO10/VO11/VO12 for Channel 1). These pins accept Low (≤300mV), Hi-Z (0.95–1.15V), or High (≥1.9V) logic states to select voltages from 0.5V to 4.2V in 50mV or 100mV increments plus discrete levels-no external DAC or resistor network required.

Does the LTM4709IY#PBF require external capacitors for stability?

Yes-the LTM4709IY#PBF requires a minimum 10μF ceramic output capacitor per channel (X5R/X7R dielectric) placed directly between VOUT and GND pins for stability and transient response. An input bypass capacitor of ≥4.7μF is also recommended at each VIN pin group. No external reference capacitor is needed, as 2.2μF is integrated internally on VREF pins.

What protection features does the LTM4709IY#PBF include?

The LTM4709IY#PBF includes undervoltage lockout (UVLO) on BIAS pins, open-drain power-good (PG) flags with 91%/88% VOUT threshold hysteresis, per-channel overcurrent protection with foldback, and thermal shutdown triggered at ~168°C junction temperature. All protections are fully integrated and require no external components.

Can the LTM4709IY#PBF be used in parallel for higher current?

Yes-the LTM4709IY#PBF supports parallel operation across multiple devices or channels to increase total output current. When paralleling, connect VIOC1 pins to the same upstream buck regulator feedback node to maintain consistent VIN–VOUT differential, and tie all BIAS, EN, and PG signals together to ensure synchronized operation and fault reporting.