Diodes Incorporated PT8A2803ZEE

Overview

PT8A2803ZEE 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 regulation accuracy at room temperature, programmable 50–500mA charge current via IREF pin, and thermal foldback at 115°C. It operates in portable electronics requiring compact, low-BOM-count charging solutions such as Bluetooth headsets and MP3 players.

For engineers reviewing the PT8A2803ZEE datasheet, PT8A2803ZEE pinout, PT8A2803ZEE application, or PT8A2803ZEE equivalent, key selection criteria include its 8-pin TDFN 2×3 package, dual open-drain status outputs (PPR/CHG), internal pass FET with 0.6Ω R_DS(ON), pre-charge threshold at 2.55V, and <1µA battery leakage in shutdown mode.

Technical Context

The PT8A2803ZEE integrates a linear pass transistor, voltage reference, current-sense amplifier, thermal sensor, and POR circuitry - eliminating external FETs and blocking diodes. Its CC/CV algorithm transitions automatically from 20% pre-charge (below 2.55V) to full-rate constant current, then to constant voltage regulation at factory-trimmed 4.2V.

Status signaling uses two independent open-drain outputs: PPR indicates input power presence (independent of EN state), while CHG asserts low during active charging and releases high at end-of-charge (EOC), with recharge hysteresis triggered at ~76% of programmed I_CHG.

Key Specifications

Pinout & Package

PT8A2803ZEE is housed in an 8-pin, 2 mm × 3 mm, lead-free and green TDFN package with exposed thermal pad (JEDEC MO-229 compliant). The bottom-side thermal pad must be soldered to PCB copper for effective heat dissipation during 500mA operation.

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, PT8A2803ZEE offers optimal balance for cost-sensitive, space-constrained designs needing programmable current, dual open-drain status outputs, and ultra-low battery leakage - without sacrificing precision or thermal safety.

Availability

PT8A2803ZEE is available at Aetrix Electronics and suitable for wireless headsets, portable media players, smart wearables, and Bluetooth trackers requiring stable component supply, RoHS-compliant packaging, and consistent parametric performance across production lots.

Supply support for PT8A2803ZEE 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 Corporation is a fabless semiconductor company specializing in power management ICs for portable and battery-powered applications, headquartered in Taiwan with global distribution.

The PT8A2803 belongs to Princeton's integrated linear charger product line, designed specifically for compact, low-cost, single-cell Li-ion/polymer charging in consumer electronics where minimal external components and robust thermal behavior are critical.

FAQ

What is the minimum input voltage required for PT8A2803ZEE to initiate charging?

The PT8A2803ZEE requires VIN ≥ 4.3V to enter normal operation per its recommended conditions. Charging begins only when VIN exceeds both the POR threshold (~3.9V) and the VIN–VBAT offset voltage (90–150mV), ensuring sufficient headroom for the internal pass FET to regulate current. Below 4.3V, the device may remain in reset or fail to sustain constant current.

Can PT8A2803ZEE charge a 4.1V or 4.36V battery variant?

Yes - while the standard PT8A2803ZEE is factory-trimmed to 4.2V ±0.5%, Princeton Technology offers 4.1V and 4.36V variants upon request. These are distinct orderable part numbers (e.g., PT8A2803-41ZEE), not user-adjustable; the voltage reference is laser-trimmed during wafer test and cannot be modified externally.

How does the CHG pin behave during pre-charge and recharge events?

The CHG pin goes low at the start of pre-charge (when VBAT < 2.55V) and remains low throughout constant-current and constant-voltage phases. It transitions high only when charge current falls below the programmed IMIN threshold. Upon recharge - triggered when battery voltage drops and current rises to ~76% of ICHG - CHG pulls low again, enabling LED blink patterns or MCU-triggered wake-up.

Is an external capacitor required on the BAT pin, and why?

Yes - a minimum 1µF X5R ceramic capacitor must be placed between BAT and GND, directly at the pin. This capacitor stabilizes the feedback loop during CV regulation, suppresses high-frequency noise from load transients, and prevents oscillation caused by PCB trace inductance. Omission risks unstable charging, inaccurate voltage regulation, or thermal shutdown under load.