ACE4102E 2.5A, 3MHz Switching Charger with Dynamic Power Path Management Description ACE4102E is a switching Li-Ion battery charger with dynamic power-path control and input current limiting. When a battery is connected, depending on the battery voltage, the DC-DC switching regulator either pre-conditions, fast-charges the battery or just regulates a system voltage (VSYS) to a preset voltage. It does not require an external sense resistor for current sensing. The charging current is determined by programming ISET1 or ISET2 pin, depending on the state of the USB_DET. If USB_DET is low, indicating an valid AC adapter input is present, the charge current is set by ISET1; otherwise, it is set by ISET2. When the battery voltage reaches the termination voltage i.e. 4.2V/4.35V, the charging path disconnects SYS to BATT. The ACE4102E also includes a dynamic power path when the SYS load current exceeds current limit of the DCDC regulator internally set, the SYS voltage falls below VBATT, ACE4102E turns on the power-path to supplement the system load through the batter. Features • • • • • • • • Switching Charger with Power Path Management Up to 95% DC-DC Efficiency 50mΩ Power Path MOSFET Up to 2.5A Max charging current Instant on with a dead Battery or no Battery No battery detection No External Sense resistor Programmable USB and AC IN Charging Current Application • • • Tablet, MID Smart Phone Power Bank Typical Application ACE4102E 2A Switching Charger with Dynamic Power Path VER 1.1 1 ACE4102E 2.5A, 3MHz Switching Charger with Dynamic Power Path Management Absolute Maximum Ratings Parameter Max IN, BATT Voltage -0.3V ~ 6V All Other Pin Voltage VIN-0.3V ~ VIN0.3V SW,SYS,BATT to ground current Internally limited Operating Temperature Range -40 OC ~85 OC Storage Temperature Range -55 OC ~150 OC θJA 50 Thermal Resistance O C/W (Note: Exceeding these limits may damage the device. Exposure to absolute maximum rating conditions for long periods may affect device reliability.) Packaging Type USB_DET BATT SYS BATT QFN3x3-16 SYS ISET2 SW STAT GND GND NTC SW ENB ISET1 PGND IN QFN3x3-16 Description Function System Voltage Pin. It is also the Switching regulator’s output pin. Connect and 1.15 SYS 2 IN 3.4 SW 5 PGND 6 ENB 7 NTC Thermistor input 8.10 GND Analog Ground Pin. Bypass with a 10uF capacitor to IN inductor and capacitor to form the output filter Input pin. Can be connected to an AC adaptor or a USB charger output. Bypass with a 10uF capacitor each to GND and PGND Switching node of the Switching Regulator. Connect a 1uH to 2.2uH inductor from this pin to SYS Power Ground. Bypass with a 10uF capacitor to IN with a shortest possible trace Active Low Enable pin. Tie this pin low to enable the Charging, tie high to disable Charging, while still keeping powerpath from BATT to SYS VER 1.1 2 ACE4102E 2.5A, 3MHz Switching Charger with Dynamic Power Path Management 9 STATS Status pin for Charging status indications. An open drain device capable of driving 10mA current AC Fast Charge Current set pin for AC input. Connecting a Resistor between ISET1 11 ISET1 to GND This sets the fast charge current value for AC adapter when USB_DET is low. 12 ISET2 USB Charge Current set pin for USB input. Connecting a Resistor between ISET2 to GND This sets the charge current value for USB input when USB_DET is high. Charge current selecting input. Pull this pin low if an AC adapter is connected and 13 USB_DET select fast charging current to be set by ISET1. And set this pin high if a USB input is connected and select USB charging current to be set by ISET2. It is default low. 14.16 BATT Battery pin. Connect a Battery to this pin Ordering information ACE4102E XX XX + H Halogen - free Pb - free CN: QFN3*3-16 42 ------- 4.2V 43 ------- 4.35V Electrical Characteristics O (VIN = 5V, unless otherwise specified. Typical values are at TA = 25 C ) Parameter Conditions Min Typ Max Units 5.5 V IN INPUT INPUT Range INPUT UVLO 4.4 Rising, Hys=500mV 4.35 V Switcher Enable, Switching 5 Switcher Enable, No Switching 70 uA uA Input Floating 0 ISYS=1A, Default 3.6 V VSYSMAX 4.5 V Load Regulation 40 mV/A 0.04 %/V 3 MHz INPUT Operating Current BATT to INPUT leakage Current 5 uA DC-DC and SYS OUTPUT VSYSMIN Line Regulation VIN =4.75 to 5.25V Switching Frequency Max duty 100 % HIGHSIDE MOS RDSON ISW =500mA 100 mΩ LOWSIDE MOS RDSON ISW =500mA 60 mΩ 3.5 A HIGHSIDE Current limit VER 1.1 3 ACE4102E 2.5A, 3MHz Switching Charger with Dynamic Power Path Management SYS UVLO Falling, Hys=200mV Thermal Shutdown 2.25 Rising, Hys=30oC V O 160 C POWER PATH Management BATT TO SYS RDSON 50 mΩ BATTERY CHARGER Battery CV voltage Charger Restart Threshold IBAT =0mA, default 4.16 4.2 4.24 4.307 4.35 4.393 V From DONE to FastCharge -200 mV VBAT Rising Hys=180mV 2.9 V 100 mA 2 A 0.5 A Pre-condition Timer 120 min Fast-Charge Timer 120 min Battery Pre-condition Voltage Pre-Condition Charge Current AC Fast Charge Current USB Charge Current RISET1 =500Ω, USB_DET= low Icharge=1V*1000/RISET1 RISET2 =2KΩ, USB_DET= high Icharge=1V*1000/RISET2 THERMISTOR MONITOR NTC Threshold, Cold Charger Suspended 76.5 %VIN NTC Threshold, Hot Charger Suspended 35 %VIN NTC Threshold Hysteresis 1.5 %VIN NTC Disable Threshold 100 mV 0 uA NTC Input Leakage LOGIC INPUT, STATS ENB Logic Input High 1.6 ENB Logic Input Low STAT Output Low Voltage ISTATS=10mA V 0.3 V 0.2 V Typical Characteristics Efficiency Vs ISYS Charger Disabled IOUT (A) ICharge Vs VBATT VBATT (V) IPre-Charge Vs VBATT VBATT (V) VER 1.1 4 ACE4102E 2.5A, 3MHz Switching Charger with Dynamic Power Path Management VSYS VS ISYS ISYS (A) Battery Inserted During Detection VSYS VS Temperature ICharge Vs Temperature Thermal Foldback Temperature(℃) Temperature(℃) Battery Pulled During Charging IN Plug-In with Battery Connected 1s/div VSYS Load Step Into Reduce Charging 50ms/div 0.5s/div VSYS Load Step Into Supplement Mode 50ms/div 5ms/div VSYS Load Step Into IN DPPM Mode, IIN LIMIT=0.5A 50ms/div VER 1.1 5 ACE4102E 2.5A, 3MHz Switching Charger with Dynamic Power Path Management DCDC PFM SWITCHING WAVEFROM ISYS=10mA 10ms/div DCDC PWM SWITCHING WAVEFORM ISYS=2A 0.5us/div IN UNPLUGGED 200us/div TYPICAL APPLICATION 2A Switching Charger with Dynamic Power Path with OVP protection and Charge Enable VER 1.1 6 ACE4102E 2.5A, 3MHz Switching Charger with Dynamic Power Path Management PCB GUIDELINE PCB layout cautions of ACE4102E is shown below. The input capacitor (Cin) between Vin (Pin2) and PGND (Pin5) is always to be placed closest to the IC. SW wire can be laid through the gap between the 2 Cin terminals. It can go underneath the Cin. For all pins that needs to shorted to GND, please connect them to GND (Pin10), not to PGND (Pin5). A real PCB layout example is also listed below for reference. PCB cautions of ACE4102E Real DEMO board PCB for reference VER 1.1 7 ACE4102E 2.5A, 3MHz Switching Charger with Dynamic Power Path Management Packing Information QFN3*3-16 NOTE: ALL DIMENSIONS REFER TO JEDEC STANDRAD MO-220 WEED-4. Symbol A A1 A3 b D E D2 E2 e K L R Min. 0.70 0.20 2.90 2.90 1.55 1.55 0.40 0.20 0.35 0.09 Dimensions in millimeters Nom. 0.75 0.02 0.20REF 0.25 3.00 3.00 1.65 1.65 0.50 0.40 - Max. 0.80 0.05 0.30 3.10 3.10 1.75 1.75 0.60 0.45 - VER 1.1 8 ACE4102E 2.5A, 3MHz Switching Charger with Dynamic Power Path Management Notes ACE does not assume any responsibility for use as critical components in life support devices or systems without the express written approval of the president and general counsel of ACE Electronics Co., LTD. As sued herein: 1. Life support devices or systems are devices or systems which, (a) are intended for surgical implant into the body, or (b) support or sustain life, and shoes failure to perform when properly used in accordance with instructions for use provided in the labeling, can be reasonably expected to result in a significant injury to the user. 2. A critical component is any component of a life support device or system whose failure to perform can be reasonably expected to cause the failure of the life support device or system, or to affect its safety or effectiveness. ACE Technology Co., LTD. http://www.ace-ele.com/ VER 1.1 9