Analog Devices Inc. LTC3204BEDC-5#TRMPBF

Overview

LTC3204BEDC-5#TRMPBF from Analog Devices (formerly Linear Technology) is a fixed 5V, low-noise, constant-frequency switched-capacitor voltage doubler IC. It delivers up to 150mA output current from a 2.7V–5.5V input (e.g., single Li-Ion battery), operates at 1.2MHz switching frequency, and features built-in soft-start, thermal shutdown, and short-circuit protection. It is used in compact, low-EMI power rails for USB OTG ports and white LED drivers.

For engineers reviewing the LTC3204BEDC-5#TRMPBF datasheet, LTC3204BEDC-5#TRMPBF pinout, LTC3204BEDC-5#TRMPBF application, or LTC3204BEDC-5#TRMPBF equivalent, key selection criteria include regulated 5V output capability under 2.7V min input, constant-frequency operation across all loads (no Burst Mode), <1µA shutdown current, and compatibility with 2.2µF ceramic flying/output capacitors in space-constrained DFN layouts.

Technical Context

The LTC3204BEDC-5#TRMPBF implements a 2-phase nonoverlapping 1.2MHz charge pump topology to double VIN and regulate VOUT to 5V ±4%. Regulation is achieved via internal resistor-divider feedback and error-amplifier-controlled pump strength modulation - not PWM or hysteretic control.

Unlike the standard LTC3204-5, the "B" variant enforces constant-frequency operation at all load levels (0–150mA), eliminating frequency variation and associated EMI spread. It includes CMOS-level active-low SHDN with 0.4V/0.7V logic thresholds, thermal shutdown at ~160°C, and automatic recovery at ~150°C.

Key Specifications

Pinout & Package

Package: 6-lead 2mm × 2mm plastic DFN (0.75mm height), exposed pad (Pin 7) tied to GND for thermal and electrical performance. Pin 1 marked with bar; exposed pad must be soldered to PCB ground plane.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar regulated charge pump applications.

Compared with LTC3204EDC-5#TRMPBF, the LTC3204BEDC-5#TRMPBF trades higher no-load current (3.6mA vs. 60µA) for deterministic 1.2MHz EMI behavior and stronger load drive (150mA vs. 100mA). Versus LTC3200-5ES6#TRMPBF, it offers +50mA output headroom and superior thermal dissipation via exposed-pad DFN - critical for sustained LED or scanner operation.

Availability

LTC3204BEDC-5#TRMPBF is available at Aetrix Electronics and suitable for USB OTG power supplies, Li-Ion–fed white LED drivers, handheld industrial scanners, and low-noise sensor bias rails requiring stable component supply and long-term manufacturability.

Supply support for LTC3204BEDC-5#TRMPBF 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 and maintains full product support, datasheets, and application engineering for legacy Linear parts including the LTC series.

The LTC3204 family was designed specifically for compact, inductorless 3.3V/5V step-up power in battery-operated portable electronics - emphasizing low EMI, minimal external components, and robust fault protection.

FAQ

What is the minimum input voltage required for the LTC3204BEDC-5#TRMPBF to regulate 5V output?

The LTC3204BEDC-5#TRMPBF requires a minimum input voltage of 2.7V to maintain regulated 5V output across its full load range (0–150mA). Below 2.7V, regulation degrades - for example, at VIN = 2.5V, VOUT drops to approximately 4.5V under 100mA load per typical performance curves. This makes it ideal for single-cell Li-Ion systems operating down to end-of-discharge.

Does the LTC3204BEDC-5#TRMPBF support automatic power-saving modes like Burst Mode?

No, the LTC3204BEDC-5#TRMPBF does not support Burst Mode® operation. As indicated by the "B" suffix, it operates at constant 1.2MHz frequency across all load conditions - from zero to 150mA. This differs from the non-B version (LTC3204EDC-5#TRMPBF), which enters Burst Mode below ~20mA to reduce quiescent current. The B-variant prioritizes EMI predictability over ultra-low IQ.

Can I use tantalum or aluminum electrolytic capacitors for the flying capacitor (CFLY) in the LTC3204BEDC-5#TRMPBF circuit?

No - polarized capacitors such as tantalum or aluminum electrolytics must never be used for CFLY in the LTC3204BEDC-5#TRMPBF. During startup and normal operation, the voltage across the flying capacitor reverses polarity, which would damage polarized types. Only low-ESR ceramic capacitors (e.g., 2.2µF X5R/X7R 0603) are permitted, as confirmed in the Absolute Maximum Ratings and Layout Considerations sections of the official datasheet.

What is the purpose of the exposed pad (Pin 7) on the LTC3204BEDC-5#TRMPBF DFN package?

The exposed pad (Pin 7) on the LTC3204BEDC-5#TRMPBF is electrically connected to GND and serves two critical functions: (1) it provides a low-thermal-resistance path (θJA = 80°C/W) from the die to the PCB ground plane, preventing thermal shutdown under 150mA load; and (2) it reduces high-frequency ground impedance, improving regulation stability and EMI performance. Per datasheet instructions, this pad must be soldered to a solid copper ground plane on the PCB.

How does the LTC3204BEDC-5#TRMPBF handle output short-circuit conditions?

The LTC3204BEDC-5#TRMPBF handles output short-circuits with dual protection: (1) current limiting clamps output current to ~300mA, and (2) thermal shutdown activates if junction temperature exceeds ~160°C. Once triggered, it cycles on/off indefinitely until the short is removed - with no latch-up or damage. During shutdown, VOUT is disconnected from VIN, and quiescent current drops below 1µA. This behavior is verified in the Absolute Maximum Ratings and Short-Circuit/Thermal Protection sections of the datasheet.