MAX8934G Dual-Input Linear Charger, Smart Power Selector with Advanced Battery Temperature Monitoring General Description Features The MAX8934G dual-input Li+/Li-Poly linear battery char- Li+ Charger with Smart Power Selector, No S ger with Smart Power SelectorK safely charges a single External MOSFETs Needed Li+/Li-Poly cell in accordance with JEITA* recommenda- Monitors Battery Temperature and Adjusts Charge S tions. The MAX8934G monitors the battery temperature Current and Termination Voltage Automatically (T ) while charging, and automatically adjusts the BATT per JEITA Recommendations fast-charge current and charge termination voltage as the OT Flags System of a Hot Battery During S battery temperature varies. The MAX8934G also monitors Discharge the battery temperature while the battery is discharging, Ultra-Low I , Always-On 3.3V LDO S Q and provides a warning flag (OT) to the system in the Common or Separate USB and Adapter Inputs S event that the battery is over temperature. Safety region 2 is supported (see Figure 6 for details). An ultra-low I , Automatic Adapter/USB/Battery Switchover Q S always-on LDO provides an additional 3.3V supply for Load Peaks in Excess of Adapter Rating are S system power. Supported by Battery The MAX8934G operates with either separate inputs Input OVP to 16V (DC) and 9V (USB) S for USB and AC adapter power, or from a single input 40mI SYS-to-BATT Switch S that accepts both. All power switches for charging and Thermal Regulation Prevents Overheating S switching the load between battery and external power 4.35V SYS Regulation Voltage S are included on-chip. No external MOSFETs are required. The MAX8934G features a Smart Power Selector to make the best use of limited USB or adapter power. Input cur- Ordering Information rent limit and battery charge current limit are indepen- dently set. Input power not used by the system charges PART TEMP RANGE PIN-PACKAGE the battery. Charge current limit and DC current limit can MAX8934GETI+ -40NC to +85NC 28 Thin QFN-EP** be set up to 1.5A and 2A, respectively, while USB input +Denotes a lead(Pb)-free/RoHS-compliant package. current can be set to 100mA or 500mA. Automatic input **EP = Exposed pad. selection switches the system load from battery to external power. The MAX8934G provides a SYS output voltage of 4.35V. Typical Operating Circuit Other features include overvoltage protection (OVP), open-drain charge status and fault outputs, power-OK monitors, charge timers, and a battery thermistor moni- LDO tor. Additionally, on-chip thermal limiting reduces the 3.3V ALWAYS-ON LINEAR battery charge-rate to prevent charger overheating. REGULATOR The MAX8934G is available in a 28-pin, 4mm x 4mm, SYS AC DC Q1 TQFN package. ADAPTER CHARGE LOAD CURRENT SYSTEM CURRENT Applications LOAD PDAs, Palmtop, and Wireless Handhelds Q3 Portable Media, MP3 Players, and PNDs Digital Still Cameras and Digital Video Cameras CHARGE AND Handheld Game Systems USB Q2 SYS LOAD BATT USB BATTERY SWITCH *JEITA (Japan Electronics and Information Technology GND Industries Association) Standard, A Guide to the Safe Use of MAX8934G Secondary Lithium Ion Batteries on NotebookType Personal Computers, April 20, 2007. Smart Power Selector is a trademark of Maxim Integrated Products, Inc. For pricing, delivery, and ordering information, please contact Maxim Direct 19-5296 Rev 0 6/10 at 1-888-629-4642, or visit Maxims website at www.maximintegrated.com.MAX8934G Dual-Input Linear Charger, Smart Power Selector with Advanced Battery Temperature Monitoring ABSOLUTE MAXIMUM RATINGS DC, PEN1 to GND .................................................-0.3V to +16V BATT Continuous Current (total in two pins) .................2.4A RMS USB to GND ............................................................-0.3V to +9V LDO Continuous Current .............................................50mA RMS V to GND ...............................................................-0.3V to +4V LDO Short-Circuit Duration ......................................... L Continuous LDO to GND ......... -0.3V to the lower of +4V and (V + 0.3V) Continuous Power Dissipation (T = +70NC) SYS A THMEN, THMSW to GND ..................... -0.3V to +(V + 0.3V) Single-Layer Board LDO THM to GND .......................................-0.3V to (V + 0.3V) (derate 20.8mW/NC above +70NC) ......................1666.7mW THMSW PSET, ISET, CT to GND ............................... -0.3V to (V + 0.3V) Multilayer Board L BATT, SYS, CEN, CHG, OT, DOK, (derate 28.6mW/NC above +70NC) ......................2285.7mW UOK, FLT, DONE, USUS, PEN2 to GND .............-0.3V to +6V Operating Temperature Range .......................... -40NC to +85NC EP (Exposed Pad) to GND ...................................-0.3V to +0.3V Junction Temperature ...................................... -40NC to +125NC DC Continuous Current (total in two pins) ....................2.4A Storage Temperature ....................................... -65NC to +150NC RMS SYS Continuous Current (total in two pins) ...................2.4A Lead Temperature (soldering, 10s) ................................+300NC RMS USB Continuous Current (total in two pins) ..................2.0A Soldering Temperature (reflow) ......................................+260NC RMS Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. ELECTRICAL CHARACTERISTICS (V = V = V = 5V, CEN = USUS = THMEN = GND, V = 4V, V = 1.65V, USB, THMSW, CHG, DONE, OT, DOK, DC PEN1 PEN2 BATT THM UOK, FLT are unconnected, C = 0.068FF, T = -40NC to +85NC, unless otherwise noted. Typical values are at T = +25NC.) (Note 1) CT A A PARAMETER CONDITIONS MIN TYP MAX UNITS DC-to-SYS PREREGULATOR DC Operating Voltage Range 4.1 6.6 V DC Withstand Voltage V = V = 0V 14 V BATT SYS DC Undervoltage Threshold When V goes low, V rising, 500mV hysteresis 3.95 4.0 4.05 V DOK DC DC Overvoltage Threshold When V goes high, V rising, 360mV hysteresis 6.8 6.9 7.0 V DOK DC I = I = 0mA, V = 0V 1 2 SYS BATT CEN DC Operating Supply Current mA I = I = 0mA, V = 5V 0.8 1.5 SYS BATT CEN DC Suspend Current V = V = V = 5V, V = 0V 195 340 FA DC CEN USUS PEN1 DC-to-SYS On-Resistance I = 400mA, V = 5V 0.2 0.35 I SYS CEN When SYS regulation and charging stops, V falling, DC DC to BATT Dropout Voltage 10 50 90 mV 150mV hysteresis 1800 2000 2200 R = 1.5kI PSET 900 1000 1100 R = 3kI PSET R = 6.3kI 450 475 500 PSET V = 5V, V = 4V, DC SYS DC Current Limit mA V = 0V, V = 5V PEN1 PEN2 T = +25NC A 450 475 500 (500mA USB mode) V = V = 0V PEN1 PEN2 80 95 100 (100mA USB mode) PSET Resistance Range 1.5 6.3 kI SYS Regulation Voltage V = 6V, I = 1mA to 1.75A, V = 5V 4.29 4.35 4.4 V DC SYS CEN Connecting DC with USB not present 1.5 ms Input Current Soft-Start Time Connecting DC with USB present 50 Fs Die temperature at when the charging current and input Thermal-Limit Temperature 100 NC current limits are reduced Thermal-Limit Gain I reduction with die temperature (above +100NC) 5 %/C SYS V Voltage I = 0 to 5mA, USB = unconnected 3 3.3 3.6 V L VL 2 Maxim Integrated