STMicroelectronics STBC08PMR

Overview

STBC08PMR from STMicroelectronics is a standalone linear Li-Ion battery charger IC designed for single-cell 4.2 V batteries, delivering up to 800 mA programmable charge current with ±1% voltage accuracy, thermal regulation at 120 °C, and integrated P-channel MOSFET-requiring no external sense resistor, blocking diode, or discrete power switch. It operates directly from USB (4.25–6.5 V) and supports pre-charge, constant-current/constant-voltage charging, C/10 termination, and low-quiescent shutdown (25 µA).

For engineers reviewing the STBC08PMR datasheet, STBC08PMR pinout, STBC08PMR application, or STBC08PMR equivalent, this device is selected for compact, thermally constrained portable designs requiring precise 4.2 V Li-Ion charging with dual status flags (CHRG, POWER ON), PROG-based current programming, and reverse leakage control (<2 µA in shutdown).

Technical Context

The STBC08PMR implements a fully integrated linear charging architecture with internal P-channel pass transistor, eliminating external power components. Its dual-loop control enforces strict 4.2 V ±1% regulation and programmable current via a single 1% resistor on the PROG pin, where V_PROG = 1.0 V in CC mode and IBAT = (V_PROG/R_PROG) × 1000.

Thermal regulation activates at ~120 °C junction temperature, reducing charge current to prevent overheating; undervoltage lockout triggers below 3.65–3.95 V on VCC, and automatic recharge initiates when battery voltage drops 200 mV below 4.2 V. Status signaling uses two open-drain pins: CHRG (low during pre-charge or active charge) and POWER ON (high-Z when VCC < UVLO or VCC > 7.2 V or VCC < VBAT).

Key Specifications

Pinout & Package

STBC08PMR is housed in a thermally enhanced DFN6 (3 × 3 mm) package with exposed pad (connected to GND), optimized for power dissipation (R_th(JA) = 105.7 °C/W) in high-density layouts.

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, STBC08PMR uniquely balances DFN6 size, dual-status signaling, PROG-based current monitoring, and ultra-low shutdown current - making it optimal for space-constrained, intelligence-aware portable chargers where thermal headroom and battery longevity are prioritized over raw current headroom.

Availability

STBC08PMR is available at Aetrix Electronics and suitable for cellular phones, Bluetooth headsets, portable medical monitors, and handheld barcode scanners requiring stable component supply, consistent parametric performance across production lots, and long-term lifecycle support.

Supply support for STBC08PMR 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

STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, designing and manufacturing analog, MCU, power, and sensor solutions for industrial, automotive, and consumer markets.

The STBC08 product line delivers highly integrated, thermally robust linear Li-Ion chargers targeting USB-powered portable electronics where minimal external components, precise voltage regulation, and intelligent status signaling are essential.

FAQ

What is the minimum input voltage required for STBC08PMR to initiate charging?

The STBC08PMR requires VCC ≥ 3.65 V (typical UVLO threshold) to exit undervoltage lockout and begin charging. Below this, POWER ON goes high-Z and no charge current flows. The functional input range starts at 4.25 V per specification, ensuring reliable operation within USB voltage tolerance.

Can STBC08PMR charge a battery while simultaneously powering a system load?

No - STBC08PMR is a dedicated linear charger without power-path management. It cannot supply system load current during charging; the BAT pin connects only to the battery. For simultaneous charging and system operation, a separate power-path IC or buck-boost regulator is required upstream of the battery.

How does the PROG pin function during charge current monitoring?

During constant-current charging, V_PROG is held at 1.0 V; IBAT = (1.0 V / R_PROG) × 1000. When not charging, V_PROG reflects actual IBAT proportionally (e.g., 0.5 V → 50% of programmed current), enabling real-time gas-gauge feedback without additional circuitry.

Is the exposed pad on the DFN6 package electrically connected, and how should it be handled?

Yes - the exposed pad is internally connected to GND and must be soldered to a large GND copper pour with multiple thermal vias. This connection is mandatory for achieving the specified R_th(JA) = 105.7 °C/W and preventing thermal shutdown under 800 mA operation.