Analog Devices Inc. LTC4088EDE-1#TRPBF

Overview

LTC4088EDE-1#TRPBF from Analog Devices (formerly Linear Technology) is a high-efficiency USB PowerPath™ controller and Li-Ion/Polymer battery charger IC with integrated synchronous step-down regulator, ideal diode, and Bat-Track™ adaptive output control. It delivers up to 1.5A charge current, maintains regulated 3.6V VOUT during low-battery "instant-on" operation, and supports programmable input current limits (100mA/500mA/1A) via logic pins D0–D2. It is used in portable media players and GPS devices requiring seamless power path management between USB input and single-cell battery.

For engineers reviewing the LTC4088EDE-1#TRPBF datasheet, LTC4088EDE-1#TRPBF pinout, LTC4088EDE-1#TRPBF application, or LTC4088EDE-1#TRPBF equivalent, key selection considerations include its 14-lead 4mm × 3mm DFN package, Bat-Track™ VOUT regulation (VBAT + 0.3V), 1.2A max input current limit, thermal-limited 1.5A charge current, and dual-mode suspend LDO (500µA / 2.5mA) for USB compliance.

Technical Context

The LTC4088EDE-1#TRPBF implements a 2.25MHz constant-frequency synchronous buck regulator with precision average input current limiting controlled by CLPROG feedback and D0/D1/D2 logic configuration. Its PowerPath architecture dynamically partitions available input power between system load (VOUT) and battery charging, prioritizing VOUT load current while reducing charge current as needed to enforce programmed IBUS limits.

It integrates an internal 180mΩ ideal diode and GATE driver for external PMOS, enabling seamless switchover from VBUS to BAT when input power is removed or insufficient. The Bat-Track™ loop regulates VOUT to ~3.6V below 3.3V BAT and transitions to VBAT + 0.3V above that threshold, minimizing charger conduction loss while ensuring instant system power-up.

Key Specifications

Pinout & Package

Package: 14-lead plastic DFN (4mm × 3mm × 0.75mm), exposed pad (Pin 15) soldered to PCB ground for thermal and electrical integrity.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar USB power management and Li-Ion charging applications.

Compared with BQ24075RGTR and MAX1555ESA+, the LTC4088EDE-1#TRPBF uniquely combines programmable USB current limiting, Bat-Track™ adaptive VOUT, integrated ideal diode, and external PMOS control - enabling higher efficiency, faster charging, and true seamless power switchover in thermally constrained portable designs.

Availability

LTC4088EDE-1#TRPBF is available at Aetrix Electronics and suitable for media players, GPS navigation units, and digital cameras requiring stable component supply, USB-compliant power management, and reliable single-cell Li-Ion charging.

Supply support for LTC4088EDE-1#TRPBF 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 (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and power management semiconductors, serving industrial, automotive, communications, and consumer markets.

The LTC4088-1 product line was designed specifically for USB-powered portable electronics needing intelligent power path control, efficient battery charging, and seamless backup power switchover - targeting space- and thermal-constrained applications.

FAQ

What is the default power-up behavior of the LTC4088EDE-1#TRPBF?

The LTC4088EDE-1#TRPBF powers up with the battery charger disabled (unlike the LTC4088-2 variant). This ensures zero initial charge current draw until enabled by system firmware or logic pin configuration, preventing unintended battery stress during startup. The LTC4088EDE-1#TRPBF remains in this state until D0–D2 pins configure a valid current limit mode and PROG resistor enables charging.

How does the LTC4088EDE-1#TRPBF maintain VOUT during low-battery conditions?

The LTC4088EDE-1#TRPBF uses its Bat-Track™ circuit to regulate VOUT to a fixed 3.6V when battery voltage drops below 3.3V - enabling "instant-on" system operation even with deeply discharged cells. This is enforced by an internal undervoltage detection loop that actively reduces charge current to preserve VOUT stability, prioritizing system load over charging.

Can the LTC4088EDE-1#TRPBF support both USB and wall adapter inputs?

Yes, the LTC4088EDE-1#TRPBF accepts VBUS input from 4.35V to 5.5V, covering standard USB 5V ports and common 5V wall adapters. Its VBUS UVLO (4.3V rising threshold) and 7V transient rating ensure robust operation across both sources. Input current limits are programmable via D0–D2 to match either USB low-power (100mA) or wall adapter high-power (1A) profiles.

What external components are required for basic LTC4088EDE-1#TRPBF operation?

Essential external components for the LTC4088EDE-1#TRPBF include: a 3.3µH power inductor between SW and VOUT; 10µF MLCC output capacitor at VOUT; 1% RCLPROG (e.g., 2.94kΩ) from CLPROG to GND; 1% RPROG (e.g., 1kΩ) from PROG to GND; and a 100kΩ–1MΩ bias resistor from VBUS to NTC for temperature monitoring. An external PMOS (e.g., Si2333) is optional but recommended for lowest dropout.

Does the LTC4088EDE-1#TRPBF provide battery temperature monitoring?

Yes, the LTC4088EDE-1#TRPBF monitors battery temperature via the NTC pin using an external NTC thermistor network. It detects cold (<75% VBUS) and hot (>36.4% VBUS) conditions and pauses charging until the battery returns to the safe range. If temperature monitoring is not required, the NTC pin must be grounded per datasheet guidance to avoid undefined behavior.