MC34674: Single-Cell Li-Ion/Li-Polymer Battery Travel Charger

The MC34674 is a fully integrated single-cell Li-Ion and Li-Polymer battery charger optimized for travel charger applications. The few external components required include a dual-color LED for charge-status indication, a negative-temperature-coefficient (NTC) thermistor circuit for setting the charge temperature window, and two decoupling capacitors.

The MC34674 tolerates an input voltage up to 28 V, which allows low-cost ac/dc converters to be used for further system-cost reduction. A charge cycle of the MC34674 includes trickle, constant-current (CC) and constant-voltage (CV) charge modes. The CC-mode current is selectable from 50 mA to 1.05 A, with 10% accuracy and the constant-output voltage in the CV-mode is fixed at 4.2 V.

The MC34674 has many features such as trickle charging for a deeply-discharged battery, an internal timer for termination to prevent charging a failed battery, charger current thermal foldback for thermal protection, and smart battery-connection verification to prevent charging in case there is no battery connected. It has a 2.6 V falling power-on-reset (POR) threshold, making it perfect to work with current-limited power supplies. When the charger is disabled, the BAT pin leaks less than 1 µA current from the battery.

NXP^® MC34674 Battery Management Block Diagram

NXP^® MC34674 Product Image

特性

No external MOSFET, reverse-blocking diode or current-sense resistor are required
28 V maximum input voltage rating with 11 V over-voltage-protection threshold
Factory programmable charge current
Trickle charge for fully discharged batteries
±0.4% voltage accuracy over -20 °C to 70 °C
Driving a dual-color LED and smart battery-connection verification optimized for travel charger applications
Interface to NTC thermistor
Internal timer and thermal current limit
Small 8-lead 2X3 mm thermally enhanced UDFN package

Name/Description	Type	Modified Date
MC34674, High Input Voltage Travel Charger for Single-cell Li-Ion Batteries (REV 2.0) PDF (597.2 kB) MC34674	Data Sheets	20 Nov 2008
MC34674FS, Industry's most flexible battery charger solution (REV 2.0) PDF (272.8 kB) MC34674FS	Fact Sheets	24 Nov 2008
AN1902, Assembly Guidelines for QFN (Quad Flat No-Lead) and DFN (Dual Flat No-Lead) Packages - Application Note (REV 7.0) PDF (3.6 MB) AN1902	Application Notes	13 Oct 2014

Data Sheets (1)

Name/Description	Modified Date
MC34674, High Input Voltage Travel Charger for Single-cell Li-Ion Batteries (REV 2.0) PDF (597.2 kB) MC34674	20 Nov 2008

Application Notes (2)

Name/Description	Modified Date
Wireless Charging Receiver Using the Kinetis® KL05Z32 MCU - Application Note (REV 0) PDF (268.3 kB) AN5075	09 Feb 2015
AN1902, Assembly Guidelines for QFN (Quad Flat No-Lead) and DFN (Dual Flat No-Lead) Packages - Application Note (REV 7.0) PDF (3.6 MB) AN1902	13 Oct 2014

Users Guides (1)

Name/Description	Modified Date
KIT34674EPEVBE, Using the High-Input-Voltage Travel Charger for Single Cell Li-Ion Batteries - User Guide (REV 1.0) PDF (267.3 kB) KT34674UG	18 Jun 2009

Fact Sheets (1)

Name/Description	Modified Date
MC34674FS, Industry's most flexible battery charger solution (REV 2.0) PDF (272.8 kB) MC34674FS	24 Nov 2008

Brochures (1)

Name/Description	Modified Date
Medical Brochure (REV 3) PDF (254.7 kB) BRMEDICAL	12 Sep 2012

Ordering Information

Product	Status	Device Function	Budgetary Price excluding tax(US$)	Package Type and Termination Count	Output Voltage	Output Current (A)	Battery Charger	Number of Battery Cells	Charge Termination Method	Charge Current Type	Supply Voltage (Min-Max) (V)	Interface and Input Control	Ambient Operating Temperature (Min-Max) (°C)	Protection	Additional Features - Power Management	Pin count	Input Voltage (Max) (V)	RoHS
MC34674BEPR2	Active	Battery Chargers	1K @ US$0.44	DFN-EP 8	4.2	0.85	Li-Polymer, Li-Ion	1	End of Charge (EOC), Timeout, MCU control, Over Voltage (OVP)	Tickle Charge Current, Constant Charge Current	4.3 to 10	Parallel	-40 to 85	Die Temperature Current Limit, Battery Thermal Regulation, Overvoltage Protect	AC Supply Voltage, End of Charge Termination, Overvoltage Charge Termination	8	28	[object Object]
MC34674AEPR2	Active	Battery Chargers	1K @ US$0.44	DFN-EP 8	4.2	1.05	Li-Polymer, Li-Ion	1	End of Charge (EOC), Timeout, MCU control, Over Voltage (OVP)	Tickle Charge Current, Constant Charge Current	4.3 to 10	Parallel	-40 to 85	Die Temperature Current Limit, Battery Thermal Regulation, Overvoltage Protect	AC Supply Voltage, End of Charge Termination, Overvoltage Charge Termination	8	28	[object Object]
MC34674DEPR2	Active	Battery Chargers	1K @ US$0.44	DFN-EP 8	4.2	0.45	Li-Polymer, Li-Ion	1	End of Charge (EOC), Timeout, MCU control, Over Voltage (OVP)	Tickle Charge Current, Constant Charge Current	4.3 to 10	Parallel	-40 to 85	Die Temperature Current Limit, Battery Thermal Regulation, Overvoltage Protect	AC Supply Voltage, End of Charge Termination, Overvoltage Charge Termination	8	28	[object Object]
MC34674CEPR2	Active	Battery Chargers	1K @ US$0.44	DFN-EP 8	4.2	0.65	Li-Polymer, Li-Ion	1	End of Charge (EOC), Timeout, MCU control, Over Voltage (OVP)	Tickle Charge Current, Constant Charge Current	4.3 to 10	Parallel	-40 to 85	Die Temperature Current Limit, Battery Thermal Regulation, Overvoltage Protect	AC Supply Voltage, End of Charge Termination, Overvoltage Charge Termination	8	28	[object Object]

Package Information

Package Description	Outline Version	Packing	Product Status	Part Number	Chemical Content	MSL	PPT (°C)
QFN-D 8 EP 230.65P0.5	98ASA10774D	MPQ - 3000 REELPOQ - 3000 BOX	Active	MC34674AEPR2	MC34674AEPR2.pdf	1	260
		MPQ - 3000 REELPOQ - 3000 BOX	Active	MC34674BEPR2	MC34674BEPR2.pdf	1	260
		MPQ - 3000 REELPOQ - 3000 BOX	Active	MC34674CEPR2	MC34674CEPR2.pdf	1	260
		MPQ - 3000 REELPOQ - 3000 BOX	Active	MC34674DEPR2	MC34674DEPR2.pdf	1	260