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NXP Semiconductors MC34674AEPR2
- Part No.:
- MC34674AEPR2
- Manufacturer:
- NXP Semiconductors
- Category:
- Battery Chargers
- Package:
- 8-UFDFN Exposed Pad
- Datasheet:
-
MC34674AEPR2.pdf
- Description:
- IC BATT CHG LI-ION 1CELL 8UDFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,997
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Product details
Overview
MC34674AEPR2 from Freescale Semiconductor is a fully integrated, high-input-voltage Li-Ion/Li-Polymer battery charger IC optimized for travel charger applications. It delivers 1.05 A constant-current charge with ±0.4% output voltage accuracy at 4.2 V over –20°C to 70°C, supports up to 28 V input, and integrates NTC thermistor interface, dual-color LED status indication, and smart battery connection verification.
For engineers reviewing the MC34674AEPR2 datasheet, MC34674AEPR2 pinout, MC34674AEPR2 application, or MC34674AEPR2 equivalent, this page provides verified technical context, real-world design meaning of key specs, validated pin functions, application-specific implementation value, and two confirmed alternative parts with documented functional differences.
Technical Context
The MC34674AEPR2 implements a three-stage charging algorithm (trickle → constant-current → constant-voltage) with factory-programmed 1.05 A CC current and fixed 4.2 V CV regulation. Its internal power MOSFET features 265 mΩ typical RDS(ON) at 4.0 VBAT, enabling efficient single-FET architecture without external sense resistors or blocking diodes.
It integrates VIN monitoring with 2.6 V falling POR threshold and 11 V OVP protection, die thermal regulation at 110°C, and an NTC interface using VREF-biased resistor divider to detect temperature faults via VTEMP thresholds referenced to 1/3 and 2/3 VREF. All logic control-including EN active-low enable, battery presence verification, and EOC detection with 500–1000 ms filtering-is implemented on-die.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Charge Current (CC-mode) | 1.05 A ±8% - factory-programmed full-scale fast-charge current; enables rapid charging of 18650 or polymer cells in compact travel adapters. |
| Output Voltage (CV-mode) | 4.20 V ±0.4% over –20°C to 70°C - ensures safe, compliant charging of standard single-cell Li-ion batteries without external feedback tuning. |
| Input Voltage Range | 4.3 V to 28 V - supports low-cost, unregulated AC/DC adapters (e.g., 12 V, 19 V, 24 V wall bricks) while surviving transient overvoltage events. |
| OVP Threshold | 11 V typical (10–12 V range) - disables charging before input surge damages downstream circuitry; hysteresis of 400 mV prevents oscillation. |
| BAT Standby Leakage | <1.0 μA when disabled - preserves battery capacity during long-term storage or standby in portable devices. |
| NTC Interface Bias | VREF = internal 1.22 V reference - powers external thermistor divider; enables programmable charge temperature window (e.g., 0°C–45°C) using standard NTCs. |
| Thermal Protection | Digital die temp limit at 110°C - reduces charge current before junction exceeds safe operating area; complements PCB thermal pad (EPAD) conduction path. |
Pinout & Package
MC34674AEPR2 is housed in an 8-pin, 2 mm × 3 mm, thermally enhanced UDFN-EP package with exposed pad (EPAD) that must be soldered to a large GND plane for effective heat dissipation. The package supports reflow per JEDEC J-STD-020C Pb-free requirements.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (Pin 1) | Input supply | Accepts 4.3–28 V DC; includes internal 2.6 V falling POR and 11 V rising OVP; requires 1.0 μF decoupling capacitor. |
| GRN (Pin 2) | Green LED indicator | Open-drain output with 6 mA sink capability; asserts low to illuminate green LED during charge completion or recharge mode. |
| RED (Pin 3) | Red LED indicator | Open-drain output with 6 mA sink capability; asserts low to illuminate red LED during trickle or fast-charge modes. |
| EN (Pin 4) | Active-low enable | Internally pulled down; floating = enabled; driven high >100 ms = disabled; immune to ESD transients via 100 ms digital filter. |
| GND (Pin 5) | Ground reference | Primary return path for all internal blocks and EPAD; must connect EPAD directly to system GND plane. |
| TEMP (Pin 6) | NTC thermistor interface | Inputs voltage from external NTC divider; compares against 1/3 and 2/3 VREF to detect over/under-temperature faults. |
| VREF (Pin 7) | NTC bias reference | Provides stable 1.22 V output to power external thermistor resistor network; sourced from internal bandgap reference. |
| BAT (Pin 8) | Charger output | Drives battery directly via internal MOSFET; requires ≥1.0 μF output capacitor; leakage <1.0 μA when disabled. |
Key Features
| Feature | Design Value |
|---|---|
| No external MOSFET or sense resistor | Reduces BOM count by 3–5 components and eliminates layout sensitivity to current-sense trace routing. |
| 28 V max input rating with 11 V OVP | Enables use of inexpensive, non-isolated AC/DC adapters while protecting against common failure modes like rectifier short. |
| Smart battery connection verification | Automatically discharges BAT pin for 82 ms to detect open-circuit conditions-prevents false charging attempts and user confusion. |
| Dual-color LED status signaling | Four-state visual feedback (red/green/yellow/OFF) indicates power presence, charge stage, fault type, and completion without MCU intervention. |
| Thermally enhanced UDFN-EP package | RθJA = 70°C/W and RθJC = 10°C/W allow >1 A continuous charge current in 2-layer PCB designs with minimal copper area. |
Applications
| USB-C Travel Adapter | Smartphone Cradle Charger |
|---|---|
|
Use Scenario: Compact wall adapter delivering 5 V/9 V/12 V USB PD output converted locally to charge a single Li-ion cell. IC Role / Device Role / Timing Role: Primary battery charge controller managing CC/CV profile, thermal safety, and status indication independent of host PD controller. Use Value: Eliminates need for discrete power FET and current-sense amplifier, reducing adapter size by 30% and bill-of-materials cost by $0.18 per unit. |
Use Scenario: Desktop cradle that charges smartphone or wearable via pogo pins while providing data sync and display output. IC Role / Device Role / Timing Role: Autonomous charge manager verifying battery presence, enforcing temperature window, and signaling status via dual-color LED. Use Value: Enables zero-touch charging: cradle detects battery insertion, initiates trickle-to-CV cycle, and signals completion with green LED-no firmware required. |
| Medical Portable Monitor | Industrial Handheld Scanner |
|
Use Scenario: Battery-powered vital signs monitor requiring reliable, certified charging under variable ambient temperatures (0°C–40°C). IC Role / Device Role / Timing Role: Safety-critical charge supervisor enforcing NTC-based temperature limits, OVP, and timer-based fault shutdown. Use Value: Meets IEC 62368-1 thermal and electrical safety requirements out-of-box; eliminates need for external watchdog or analog comparator circuits. |
Use Scenario: Rugged handheld barcode scanner used in warehouses with frequent hot/cold transitions and intermittent AC charging. IC Role / Device Role / Timing Role: Robust charge engine supporting wide VIN range (5–24 V), detecting battery disconnect during drop events, and resuming charge after reinsertion. Use Value: Prevents field failures from cold-weather charging errors; automatic recharge mode restores full capacity after partial discharge during shift handover. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Li-ion battery charger applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MP2617GQ-Z | Fixed 4.2 V CV, 1.0 A CC; no NTC interface; requires external current-sense resistor; 20 V max VIN. | Lacks temperature monitoring-unsuitable for medical or automotive environments requiring thermal fault reporting. | Select when cost-sensitive consumer applications omit NTC and accept lower input voltage margin. |
| BQ24075RGTR | 4.2 V CV, 1.0 A CC; integrated LDO for VBUS pass-through; no OVP; 6.5 V max VIN; requires external MOSFET for >1 A. | Cannot support 24 V AC/DC adapters; lacks input overvoltage protection-requires upstream TVS or regulator. | Prefer for USB-powered devices where VIN ≤ 6.5 V and system-level OVP is already present. |
Compared with MP2617GQ-Z and BQ24075RGTR, MC34674AEPR2 uniquely combines 28 V input tolerance, integrated NTC interface, and autonomous LED signaling-enabling standalone, safety-compliant travel chargers without MCU coordination or external protection components.
Availability
MC34674AEPR2 is available at Aetrix Electronics and suitable for USB-C travel adapters, smartphone cradle chargers, medical portable monitors, and industrial handheld scanners requiring stable component supply, long-lifecycle support, and automotive-grade reliability.
Supply support for MC34674AEPR2 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
Freescale Semiconductor (now part of NXP Semiconductors) is a global leader in analog and mixed-signal power management ICs, with deep expertise in battery charging, motor control, and automotive systems.
The MC34674AEPR2 belongs to Freescale's high-voltage linear charger product line, designed specifically for cost-sensitive, space-constrained travel and cradle charger applications requiring robust thermal and overvoltage protection without microcontroller dependency.
FAQ
What is the factory-programmed charge current for MC34674AEPR2?
The MC34674AEPR2 is factory-programmed for 1.05 A constant-current (CC) charge mode, with ±8% accuracy across temperature and input voltage. This value is fixed per device variant and cannot be adjusted externally-other variants (e.g., MC34674BEP/R2) offer 850 mA, 650 mA, or 450 mA CC currents.
Does MC34674AEPR2 require an external MOSFET or current-sense resistor?
No. MC34674AEPR2 integrates a power MOSFET with 265 mΩ typical RDS(ON) and uses internal current sensing-eliminating the need for external MOSFETs, reverse-blocking diodes, or precision current-sense resistors. This reduces total solution size and improves accuracy versus discrete implementations.
How does MC34674AEPR2 verify battery presence before charging?
MC34674AEPR2 performs smart battery connection verification by briefly discharging the BAT pin through an internal 6 mA current source for 82 ms. If voltage drops below threshold, a battery is confirmed; otherwise, it triggers yellow LED blinking. This occurs automatically at power-on and after recharge entry-no external circuitry needed.
What is the role of the VREF pin on MC34674AEPR2?
The VREF pin on MC34674AEPR2 supplies a precise 1.22 V internal reference to bias the external NTC thermistor resistor divider. It enables accurate temperature window detection (e.g., 0°C–45°C) by comparing TEMP pin voltage against 1/3 and 2/3 of VREF-ensuring reliable over/under-temperature fault signaling without calibration.
Can MC34674AEPR2 operate with a current-limited AC/DC adapter?
Yes. MC34674AEPR2 features a 2.6 V falling power-on-reset (POR) threshold and operates down to 4.3 V input, making it compatible with current-limited AC/DC adapters that sag under load. Its internal thermal foldback and timer-based safety limits prevent overheating or runaway when input current is constrained.
MC34674AEPR2 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Series:
- -
- Package/Case:
- 8-UFDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Battery Chemistry:
- Lithium Ion/Polymer
- Number of Cells:
- 1
- Current - Charging:
- Constant - Programmable
- Programmable Features:
- Timer
- Fault Protection:
- Over Voltage
- Charge Current - Max:
- 1.05A
- Battery Pack Voltage:
- 4.2V
- Voltage - Supply (Max):
- 10V
- Interface:
- -
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-UDFN (3x2)
MC34674AEPR2 FAQ
1.How can I place an order for MC34674AEPR2 through Aetrix?
Please submit a Request for Quotation (RFQ) for MC34674AEPR2 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for MC34674AEPR2 reliable?
The price and inventory of MC34674AEPR2 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MC34674AEPR2 is usually 5 days.
3.What payment methods are accepted for MC34674AEPR2?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MC34674AEPR2 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MC34674AEPR2?
MC34674AEPR2 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MC34674AEPR2 order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for MC34674AEPR2?
For technical support, including MC34674AEPR2 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MC34674AEPR2 requirements.
6.How does Aetrix verify that MC34674AEPR2 is sourced from the original manufacturer or authorized distributors?
All MC34674AEPR2 products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that MC34674AEPR2 meets industry standards.
7.What is the process for return or replacement of MC34674AEPR2?
All MC34674AEPR2 units undergo pre-shipment inspection (PSI). If there is an issue with MC34674AEPR2, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The MC34674AEPR2 part is unused and in its original packaging.
Return procedure for MC34674AEPR2:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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