Texas Instruments BQ2057PDGKG4

Overview

BQ2057PDGKG4 from Texas Instruments is a linear lithium-ion/lithium-polymer charge management IC for single-cell (4.2 V) or dual-cell (8.4 V) battery packs. It integrates voltage regulation (±1% accuracy), current regulation (105 mV threshold), AutoComp™ dynamic impedance compensation, temperature monitoring via TS pin, and three-phase charging (preconditioning, constant-current, constant-voltage). It is used in portable medical equipment and EPOS card readers requiring compact, low-heat charging.

For engineers reviewing the BQ2057PDGKG4 datasheet, BQ2057PDGKG4 pinout, BQ2057PDGKG4 application, or BQ2057PDGKG4 equivalent, key selection factors include its MSOP-8 package, 0.3-V dropout voltage, ±1% voltage regulation, programmable precharge and termination thresholds, and integrated cell conditioning for deeply discharged Li-ion cells.

Technical Context

The BQ2057PDGKG4 implements a three-stage linear charge algorithm: preconditioning at ~10% of regulation current when V_BAT < V_min (3.10 V), constant-current regulation via external sense resistor (SNS pin), then constant-voltage regulation at fixed 4.2 V (BQ2057C variant). Charge terminates at I_TERM = −14 mV (relative to V_CC or V_SS).

It supports high-side or low-side current sensing without additional components, uses an external thermistor on TS pin with V_TS1 = 30% V_CC and V_TS2 = 60% V_CC thresholds, and enters sleep mode when V_CC < V_BAT, drawing only 3–6 µA.

Key Specifications

Pinout & Package

Package: 8-pin MSOP (DGK), body size 3.00 mm × 3.00 mm, exposed pad optional per TI design guidelines.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar linear Li-ion charge management applications.

Compared with BQ2057PDGKG4, BQ24013DRCR integrates the pass switch but omits AutoComp and dual-cell capability, while TP4056 offers basic charging at lower cost but lacks temperature supervision and deep-discharge recovery - making BQ2057PDGKG4 optimal for safety-critical portable medical and industrial applications.

Availability

BQ2057PDGKG4 is available at Aetrix Electronics and suitable for portable medical equipment, EPOS card readers, emergency call systems, and gaming accessories requiring stable component supply and long-term production continuity.

Supply support for BQ2057PDGKG4 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

Texas Instruments is a global semiconductor company specializing in analog, embedded processing, and power management technologies.

The BQ2057 series belongs to TI's battery management portfolio, designed specifically for cost-sensitive, space-constrained portable electronics needing accurate, safe, and feature-rich linear charging of Li-ion/Li-pol cells.

FAQ

What is the exact charge regulation voltage of the BQ2057PDGKG4?

The BQ2057PDGKG4 is the BQ2057C variant, with a nominal charge regulation voltage of 4.20 V and tolerance of ±1% (4.158 V to 4.242 V) over temperature and supply voltage ranges. This fixed voltage is factory-trimmed and does not require external resistive programming, ensuring consistent single-cell Li-ion termination across production units.

Does the BQ2057PDGKG4 support dual-cell battery configurations?

No, the BQ2057PDGKG4 is the BQ2057C variant and supports only single-cell Li-ion/Li-pol batteries at 4.2 V. Dual-cell operation (8.2 V or 8.4 V) requires BQ2057T or BQ2057W variants - the PDGKG4 part number maps exclusively to the 4.2-V version in MSOP-8 packaging.

How does the AutoComp™ function work in the BQ2057PDGKG4?

The AutoComp™ function in the BQ2057PDGKG4 uses the COMP pin to accept feedback that dynamically adjusts the voltage regulation setpoint during charging. With a gain of 2.2 V/V, it compensates for rising battery internal impedance, allowing higher effective charge current later in the CV phase and reducing total charge time without compromising safety or cell longevity.

What is the purpose of the STAT pin on the BQ2057PDGKG4?

The STAT pin on the BQ2057PDGKG4 provides three-state status signaling: High = charging in progress, Low = charge complete (termination reached), and Hi-Z = temperature fault or sleep mode. It drives LEDs directly or interfaces with host processors via open-drain-compatible logic, enabling real-time system-level charge state awareness without additional monitoring circuitry.

Can the BQ2057PDGKG4 be used with a P-channel MOSFET as the pass element?

Yes, the BQ2057PDGKG4 is explicitly designed to drive either a PNP bipolar transistor or a P-channel MOSFET via its CC pin. Its source-follower output architecture provides appropriate gate/base drive characteristics, and application schematics in the datasheet confirm compatibility with devices like the SI6475DQ - enabling efficient, low-heat linear regulation in space-constrained layouts.