MC34671AEP - 600mA Li-Ion Charger, 28V Input | NXP Semiconductors
Teilenummer: MC34671AEP ✓ Aktiv| Menge | Stückpreis | Gesamt |
|---|---|---|
| 1 | $1.85 | $1,85 |
| 10 | $1.62 | $16,20 |
| 100 | $1.28 | $128,00 |
| 500 | $1.04 | $520,00 |
| 1.000 | $0.88 | $880,00 |
MC34671AEP Übersicht
A Li-Ion / Li-Polymer battery charger is an integrated power-management IC that combines a linear charging element, current-sense amplifier, voltage reference, and thermal regulation loop into one die to safely recharge a single-cell lithium chemistry battery from a DC source. The MC34671AEP belongs to the broader hierarchical category of battery management ICs (BMICs), which themselves are a sub-class of power management ICs (PMICs) within mixed-signal semiconductors.
Key features of the MC34671AEP include a complete charge cycle with constant-current (CC) and constant-voltage (CV) regulation, an input supply range of 2.6 V to 10 V with 28 V transient tolerance, programmable charge current up to 600 mA, and an internal thermal regulation loop that automatically reduces charge current at elevated die temperature. The 8-pin UDFN EP package provides a low thermal-resistance path for the internal power transistor.
The IC uses a pass-transistor linear architecture with internal current sensing. Charge current is set by an external resistor on the ISET pin. The status output (CHRG) drives an LED or a host GPIO, and the FAULT output signals a charge error. An internal protection block monitors input voltage, die temperature, and charge timer.
Typical applications include single-cell Li-Ion / Li-Polymer charger circuits in handheld point-of-sale terminals, Bluetooth speakers, wearable health monitors, USB-powered toys, GPS trackers, and backup battery packs for IoT edge nodes.
When designing with the MC34671AEP, ensure the USB / adapter current limit is not exceeded; use an input RC filter to suppress inductive transients at the adapter, and provide adequate copper area under the UDFN exposed pad to keep junction temperature within the safe operating area at full 600 mA charge current.
This page synthesizes distributor availability (3 sources), same-brand drop-in reel variants, parametric comparison against linear Li-Ion charger alternatives, and practical PCB layout notes that complement, rather than duplicate, the manufacturer datasheet.
Drop-in-Alternativen für MC34671AEP – gleiches Gehäuse, Pin-kompatibel. Bauteile mit anderem Gehäuse, die eine PCB-Überarbeitung erfordern, sind ausgeschlossen.
Schnellvergleichstool – Wählen Sie Alternativbauteile für den Direktvergleich:
MC34671AEPR2
✅ Drop-In📋 Referenzalternative (nicht im Katalog)
MC34671EP
✅ Drop-In ⚠️ Spezifikationen ungeprüft📋 Referenzalternative (nicht im Katalog)
MC34671AEP Technische Daten
| Battery Chemistry | Li-Ion / Li-Polymer (single cell) |
| Eingangsspannungsbereich | 2.6 V to 10 V (28 V transient tolerant) |
| Maximum Input Voltage (Transient) | 28 V |
| Charge Termination Voltage | 4.2 V |
| Maximum Charge Current | 600 mA (programmable via ISET resistor) |
| Number of Cells | 1 |
| Topologie | Linear (CC/CV) with thermal regulation |
| Charge Status Outputs | CHRG (open-drain), FAULT (open-drain) |
| Betriebstemperaturbereich | -40 C to +85 C |
| Gehäuse / Bauform | 8-pin UDFN EP (2 mm x 3 mm x 0.65 mm, 0.5 mm pitch) |
| Montageart | Surface Mount |
| MSL-Level | 1 |
| RoHS-Status | Compliant |
| Thermal Regulation | Internal - reduces ICHG on die over-temperature |
MC34671AEP Pin-Konfiguration
| Pin 1 | VIN — Input supply voltage (2.6 V - 10 V continuous, 28 V transient) |
| Pin 2 | GND — Ground |
| Pin 3 | VBAT — Battery connection - charge current flows into the cell |
| Pin 4 | ISET — Charge current programming pin - resistor to GND sets ICHG |
| Pin 5 | NC — Not connected (per datasheet) |
| Pin 6 | CHRG — Open-drain charge status output (active low while charging) |
| Pin 7 | FAULT — Open-drain fault indicator output |
| Pin 8 | EP — Exposed pad - thermal pad, must be soldered to PCB ground |
Typische Anwendungen
MC34671AEP ist geeignet für 8 Anwendungs: Single-Cell Li-Ion Charging in Bluetooth Speakers, Wearable Health Monitor Backup Battery, USB-Powered Point-of-Sale (POS) Terminal, IoT Edge Sensor Battery Pack, GPS Tracker Handheld Charger, Backup Battery Pack for Smart Home Hub, Portable Consumer Toy USB Charger, Industrial Handheld Scanner Cradle.
Single-Cell Li-Ion Charging in Bluetooth Speakers
The MC34671AEP fits Bluetooth speaker charger designs because its 600 mA programmable charge current recharges a single 18650 / pouch cell in 1.5-2 hours from a USB 5 V input. The 28 V transient tolerance protects the IC from the inductive spikes often present when a wall adapter is hot-plugged at the speaker's DC jack. The UDFN-8 (2x3 mm) footprint is small enough to fit inside the smallest portable enclosures, and its internal thermal regulation throttles charge current automatically if the user is streaming music while charging.
Empfohlen
Wearable Health Monitor Backup Battery
Wearable health monitors (heart-rate patches, continuous glucose monitors) need a charger that is small, low-quiescent, and tolerant of USB hot-plug transients - all properties of the MC34671AEP. Its 600 mA max charge current enables fast top-ups during the user's shower break, and the CC/CV algorithm plus internal thermal regulation makes it safe to charge while the wearable's BLE radio is active (where case temperatures can rise). The exposed-pad UDFN-8 package provides low thermal resistance into the wearable's metal chassis, eliminating the need for an external heatsink.
Empfohlen
USB-Powered Point-of-Sale (POS) Terminal
POS terminals are powered from a 5 V USB rail and must tolerate the 28 V transients a poorly-shielded cable can produce when plugged into a faulty hub. The MC34671AEP's 28 V input tolerance removes the protection diode, saving BOM cost and forward-drop losses. With a programmed 500-600 mA charge current, the POS terminal's LIPO backup cell is recharged quickly between transactions. The CHRG and FAULT open-drain outputs can be wired directly to the host MCU GPIO, so a simple status LED and fault log can be implemented with no extra glue logic.
Empfohlen
IoT Edge Sensor Battery Pack
Battery-powered IoT sensors (asset trackers, environmental monitors, smart locks) need a charger that draws minimal quiescent current when the cell is full and supports tiny Li-Polymer cells (< 500 mAh). The MC34671AEP with a reduced ISET resistor value can program charge current as low as 100 mA, and its CC/CV termination plus thermal regulation keeps the cell healthy over years of duty-cycled charging. The UDFN-8 (2x3 mm) outline is well-matched to coin-cell and pouch-cell PCB stacks, and the exposed pad anchors the package to the ground plane for thermal dissipation during high-temperature edge deployments.
Empfohlen
GPS Tracker Handheld Charger
GPS tracking devices used for fleet / asset management are usually charged via a non-USB barrel jack or automotive 12 V-24 V adapter, where transient voltages can easily exceed 20 V. The MC34671AEP's 28 V transient tolerance defends against load-dump and inductive spikes far better than MCUs with 5 V-tolerant chargers. The 600 mA max charge current recharges the single 18650 Li-Ion cell rapidly between shifts, and the UDFN-8 (2x3 mm) package fits the slim industrial enclosure typical of handheld tracker designs. A red/green status LED wired to CHRG/FAULT pin gives the user clear charging feedback.
Empfohlen
Backup Battery Pack for Smart Home Hub
Smart-home hubs and security alarm panels need a backup Li-Ion cell to ride out short mains outages. The MC34671AEP charges the backup cell from a regulated 5 V rail and tolerates the inductive transients of mains-driven power supplies. With a small ISET resistor the charger can be programmed for a slow 100-200 mA trickle that keeps the backup cell at full state-of-charge for years without over-stressing it. The small UDFN-8 (2x3 mm) footprint keeps the standby battery module PCB compact, and the open-drain CHRG output drives a panel-mounted status LED on the front of the hub.
Empfohlen
Portable Consumer Toy USB Charger
USB-chargeable toys are cost-sensitive and rarely include transient protection above 5 V. By selecting the MC34671AEP at qty-1000 pricing under USD 0.88, designers can absorb the 28 V transient rating into the BOM without adding TVS diodes, and the all-in-one charger saves space on the toy's tiny main PCB. The exposed-pad UDFN-8 package provides adequate thermal dissipation at 400-500 mA charge current for typical NiMH-replacement Li-Ion cells used in motorized toys. A single status LED indicates full charge to the user.
Empfohlen
Industrial Handheld Scanner Cradle
Industrial barcode scanner cradles accept 9-12 V DC from the station's main rail; the MC34671AEP handles this continuous input range and the inrush transients when a scanner is hot-docked. Its 600 mA maximum charge current tops up the single Li-Ion cell of the handheld scanner in 2-3 hours, keeping the scanner fleet available. The CHRG output is wired to a green LED visible from across the shop floor, while FAULT is routed to the cradle's microcontroller so a service alert can be raised for a damaged cell. The UDFN-8 package contributes no extra height to the cradle's PTH mount.
Empfohlen
Zusammenfassung der empfohlenen Produkte
Technische Referenzdaten für MC34671AEP – Vergleich, Designhinweise und Compliance-Informationen.
Auswahlhilfe
Vergleich mit Alternativen
| Parameter | Dieses Produkt | MC34671AEPR2 | MC34671EP |
|---|---|---|---|
| Package | UDFN-8 (2x3 mm) | UDFN-8 (2x3 mm) - same | UDFN-8 (2x3 mm) - same |
| Brand | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors |
| Battery Chemistry | Li-Ion / Li-Polymer (1 cell) | Li-Ion / Li-Polymer (1 cell) | Li-Ion / Li-Polymer (1 cell) |
| Input Voltage Range | 2.6 V - 10 V (28 V transient) | 2.6 V - 10 V (28 V transient) | 2.6 V - 10 V (28 V transient) |
| Max Charge Current | 600 mA | 600 mA | 600 mA |
| Topology | Linear CC/CV | Linear CC/CV | Linear CC/CV |
| Operating Temperature | -40 C to +85 C | -40 C to +85 C | -40 C to +85 C |
| Termination Voltage | 4.2 V | 4.2 V | 4.2 V |
| Status Outputs | CHRG + FAULT (open-drain) | CHRG + FAULT (open-drain) | CHRG + FAULT (open-drain) |
Wichtigste Unterscheidungsmerkmale
- 28 V transient input tolerance without external TVS (vs. MCP73831T-2ACI/OT (Microchip, SOT-23-5))
- Programmable 100 mA to 600 mA charge current from one resistor (vs. MCP73831T-2ACI/OT)
- Internal thermal regulation instead of on/off thermal shutdown (vs. Legacy discrete linear charger designs)
Designhinweise
Estimated: at VIN = 5 V, VBAT = 3.7 V, and ICHG = 600 mA, the linear pass element dissipates approximately (5 - 3.7) V x 0.6 A = 0.78 W. The UDFN-8 exposed-pad package has a thermal resistance of about 50 C/W to the die when soldered to a 1-ounce 4-layer PCB copper pour; junction temperature rise is therefore ~39 C above ambient. The internal thermal regulation loop engages around 100 C and reduces ICHG - keep the exposed pad soldered to a continuous ground copper pour of at least 100 mm^2 to stay within safe thermal limits.
Place the input capacitor (4.7 uF ceramic, X5R or better) within 2 mm of the VIN pin and the battery-output capacitor (4.7 uF ceramic) within 2 mm of the VBAT pin. Route VIN and VBAT traces on a wide copper pour (>= 0.5 mm) to minimize IR drop. Solder the central exposed pad directly to the inner ground plane with at least 5 thermal vias (0.3 mm drill) to spread heat into the inner copper layers.
Do not exceed 10 V continuous on VIN - the 28 V rating is a transient surge tolerance only, specified for non-repetitive events such as USB hot-plug into an energized hub. Do not leave ISET floating: the ISET pin requires a resistor to GND to program ICHG, otherwise the charger defaults to an undefined state. Avoid exceeding 600 mA programmed charge current - the thermal regulation will simply reduce it but the input supply must still source it.
Compliance-Informationen
RoHS / lead-free / halogen-free per NXP product page. Consumer-grade part, not AEC-Q100 qualified - look at NXP automotive power management families for vehicle applications.
