Diodes Incorporated PT8A2803ZEEX

Overview

PT8A2803ZEEX from Princeton Technology is a fully integrated linear battery charger IC for single-cell Li-ion/polymer batteries, implementing constant-current/constant-voltage (CC/CV) charging with ±0.5% 4.2V voltage regulation at room temperature, programmable 50–500mA charge current via external resistor, and thermal foldback at 115°C. It operates in 4.3–5.5V input range and delivers <1µA battery leakage when disabled - used in compact portable devices requiring minimal BOM count and no external FET or blocking diode.

For engineers reviewing the PT8A2803ZEEX datasheet, PT8A2803ZEEX pinout, PT8A2803ZEEX application, or PT8A2803ZEEX equivalent, key selection considerations include its TDFN-8 (2×3 mm) package footprint, dual open-drain status outputs (PPR/CHG), EN-active-low enable logic with internal 200kΩ pull-down, and resistor-programmable ICHG/IMIN with verified equations ICHG(mA) = 4400/RIREF(kΩ) and IMIN(mA) = 4180/RIMIN(kΩ).

Technical Context

The PT8A2803ZEEX integrates a linear pass transistor with RDS(ON) ≤ 0.6Ω (typ) and on-chip voltage reference (±0.5% accuracy at 25°C), enabling direct CC/CV regulation without external power switches. Its functional block includes POR circuitry with 3.9V rising threshold, VIN–VBAT offset comparator (90–150mV hysteresis), and thermal sensor triggering foldback at 115°C (typ).

It supports two-stage charging: pre-charge below 2.55V (at ~20% of ICHG), then CC mode until VBAT ≈ 4.2V, followed by CV mode with current tapering to programmed IMIN (20–40mA). CHG pin asserts low during active charge and releases high at EOC; PPR pin independently indicates VIN > VPOR regardless of EN state.

Key Specifications

Pinout & Package

PT8A2803ZEEX uses an 8-pin Lead-Free Green TDFN-2×3 mm package (JEDEC MO-229 compliant) with exposed thermal pad on underside for enhanced heat dissipation. The package code ZEE confirms RoHS-compliant finish and 2×3 mm body dimensions (D=2.0mm, E=3.0mm, A=0.75mm).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar single-cell Li-ion linear charger applications.

Compared with TP4056 and BQ24075, PT8A2803ZEEX offers superior integration density (TDFN-8), guaranteed 2.55V pre-charge threshold, and dual independent status outputs - making it optimal for space-constrained, battery-first portable devices where simplicity and reliability are prioritized over system-power functionality.

Availability

PT8A2803ZEEX is available at Aetrix Electronics and suitable for wireless headphones, portable medical sensors, smart remote controls, and industrial handheld scanners requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for PT8A2803ZEEX 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

Princeton Technology is a fabless semiconductor company specializing in analog and mixed-signal power management ICs for portable electronics, with design centers in Taiwan and sales offices across Asia and North America.

The PT8A2803 product line targets ultra-compact, low-BOM-count Li-ion charging solutions - emphasizing integration, thermal resilience, and ease of resistor-based configuration for consumer and medical wearables.

FAQ

What is the minimum input voltage required for PT8A2803ZEEX to initiate charging?

The PT8A2803ZEEX requires VIN ≥ 4.3V to operate within recommended conditions. Charging begins only when VIN exceeds both the POR threshold (~3.9V) and the VIN–VBAT offset voltage (90–150mV). Below 4.3V, regulation accuracy and thermal margin degrade significantly - especially at high ICHG settings.

Can PT8A2803ZEEX be used without connecting the battery during testing?

No. The PT8A2803ZEEX requires the BAT pin to be connected to a Li-ion/polymer cell (with ≥1µF X5R capacitor) for stability. Operation without battery is not characterized and may cause oscillation or undefined behavior - the datasheet explicitly states it is "not guaranteed to be stable if the battery is not connected."

How does the thermal foldback function interact with the CHG pin status?

Thermal foldback reduces charge current to limit die temperature but does not trigger CHG pin transition - CHG remains low during active charge regardless of thermal throttling. CHG only goes high at true EOC (when ICHG ≤ IMIN), and reasserts low only upon recharge event (current rise to ~76% of ICHG), independent of temperature.

Is the 4.2V charge voltage trimmable to 4.1V or 4.36V in PT8A2803ZEEX?

Yes - alternate voltage options (4.1V and 4.36V) are factory-trimmed and available upon request as custom order variants. The standard PT8A2803ZEEX is specified for 4.2V ±0.5% at 25°C; voltage option selection must be confirmed at time of order and is not user-adjustable via pins or registers.