PT6104. Multi-Cell Li-ion Battery Pack Charger controller FEATURES GENERAL DESCRIPTION APPLICATIONS TYPICAL APPLICATION DIAGRAM

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Stephen Carson
5 years ago
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GENERAL DESCRIPTION The PT6104 is an high efficiency, pulse frequency modulated (PFM) switching charger controller for 2 or 4 cell li-ion battery packs.

By changing topology and external parts, user could apply PT6105 to multiple applications, like having different battery cells, charging current, or switching frequencies.

Over temperature protection for battery pack is realized through an externally connected thermal resistor.

1 GENERAL DESCRIPTION The PT6104 is an high efficiency, pulse frequency modulated (PFM) switching charger controller for 2 or 4 cell li-ion battery packs. It supports three segments of charging periods, small current pre-charging, constant current, and constant voltage. By changing topology and external parts, user could apply PT6105 to multiple applications, like having different battery cells, charging current, or switching frequencies. The PT6104 also provides necessary battery charging protections for short circuit, over voltage, ultra low voltage, pre-charge level, fast charge, and over current. Over temperature protection for battery pack is realized through an externally connected thermal resistor. The package of PT6104 is SOP8 APPLICATIONS portable DVD player LCD TV other portable devices FEATURES Battery plug-in detect: Constant current charge; the fast charge current can be adjust by external resistor. Ultra low battery voltage protect: Using small pre-charge current to protect the battery in ultra low voltage; Normal charge mode: Using the pre-set current to fast charge the battery; Accurate full charge detection by sensing charging current; Protecting functions for over voltage, over current, and ultra low voltage; Battery over temperature protection before and during charging. Charge time protections for pre-charge and fast charge periods; Recharging function: After being fully charged, The battery will be recharged if the battery voltage drops below 3.9v. LEDs indicate different charging states 4.5V operating voltage. TYPICAL APPLICATION DIAGRAM VIN R1 R14 R12 C1 C2 PFM R10 R11 R2 C4 431 R13 TS CS RC R15 C3 R4 R6 R10 R8 OSC VS R5 R7 Rt LED GND R9 1

2 PIN ASSIGNMENT PIN DESCRIPTIONS PIN SYMBOL DESCRIPTION 1 Power input 2 TS External thermal sensor input terminal. 3 OSC Oscillator input. 4 LED LED charge/discharge state display output 5 GND Ground input 6 VS Battery sample voltage input 7 CS Charge current sample input 8 PFM Pulse Frequency modulation output ABSOLUTE MAXIMUM RATINGS SYMBOL ITEMS VALUE UNIT Power Supply Voltage -0.3~7 V PFM Pulse frequency modulation -0.3~7 V LED Charge/discharge state contrl -0.3~7 V TS Battery temp detect -0.3~7 V All Other Pins -0.3~7 V Operating temperature -40~85 Storage temperature -55~125 2

3 RECOMMENDED OPERATING RANGE SYMBOL ITEMS VALUE UNIT 4.5 V PFM 0~4.5 V LED 0.4~4.0 V TS 2.25~4.5 V Vs 2.0~4.3 V Cs 2.0~4.3 V Temperature Range 0~85 ELECTRICAL CHARACTERISTICS SYMBOL PARAMETER TEST CONDITION MIN TYP MAX UNIT Supply voltage Supply voltage 4.5 V Charge mode control Vplug Battery plug-in voltage Vmin Pre-charge voltage Vfull-error Charge full error Vre-charge Re-charge voltage V Vfast Constant voltage Vmax Maximum voltage Charge current control V(Idelt) Volt of fast charge mode V(pre) Volt of pre charge mode Sense resistor is 0.5Ω mv V(Ifull) Volt of charge termination LED drive current Iled LED driving current 10 ma Charge time control Tpre Pre-charge protection time 20 min Ttotal Total charge protection time 2 hr Over temperature protection Tprel Pre-charge shutdown 0 Tpreh temperatrue 43 Tchl Normal charge shutdown 0 Tchh temperature 53 3

4 SIMPLIFIED BLOCK DIAGRAM 4

5 PACKAGE INFORMATION L SYMBOL DIMENSIONS IN MILLIMETERS DIMENSIONS IN INCH MIN MAX MIN MAX A A A b c D E E e 1.270(BSC) 0.050(BSC) L θ

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