Outline This IC is used to control charging of lithium-ion batteries. This one IC incorporates functions for constant current and constant-voltage charging and for precharging, for an overcharge timer, battery temperature detection, and other protective functions. It was developed by adding to the previous MM1332 and 1333 the above-described functions.
Features 1. charging voltage accuracy ±30mV/cell. 2. Consumption current 5mA typ. 3. Precharge function. 4. Recharge function. 5. Overcharge timer. 6. Battery temperature detection function. 7. We can supply type for one and two cells.
Applications IC for control of lithium-ion batteries charging.
Outline This IC is used to control charging of lithium-ion batteries consisting of a single cell. It is a modification of the previous MM1332 charging-control IC, with improved charging voltage accuracy and a smaller package. A low voltage circuit is built in (operates at SW2 = “L” ) that can prohibit low voltage battery (2.15V typ.) charging. When SW2 = “H”, the low voltage circuit is turned off and even a low voltage battery can be charged.
Features 1. charging voltage accuracy (Ta=25°C) ±25mV/cell 2. charging voltage accuracy (Ta=0 to 50°C) ±30mV/cell 3. Consumption current (charging on) 250µA typ. 4. Consumption current (charging off) 2µA typ. 5. Low-voltage detection 2.15V typ. 6. Leakage current between CEL and CS 1µA max.
Applications IC for control of lithium-ion batteries charging.
The MB3879 is a DC/DC converter IC for parallel charging of 3/4 cell Li-ion & NiMH batteries, which uses the pulse-width modulation (PWM) for controlling output voltages and output currents independently. This IC can dynamically control secondary batterie’s charge current, which detects voltage dropping in an AC adapter in order to keep its power constant (Dynamically controlled charging). This operation allows quick charging by variable charging current in accordance with operating status of a notebook PC.
■ DESCRIPTION The MB3878 is a DC/DC converter IC suitable for down-conversion, using pulse-width (PWM) charging and enabling output voltage to be set to any desired level from one cell to four cells. These ICs can dynamically control the secondary battery’s charge current by detecting a voltage drop in an AC adaptor in order to keep its power constant (dynamically-controlled charging). The charging method enables quick charging, for example, with the AC adaptor during operation of a notebook PC. The MB3878 provides a broad power supply voltage range and low standby current as well as high efficiency, making it ideal for use as a built-in charging device in products such as notebook PC.
■ FEATURES • Detecting a voltage drop in the AC adaptor and dynamically controlling the charge current (Dynamically-controlled charging) • Output voltage setting using external resistor : 1 cell to 4 cells • High efficiency : 94 % • Wide range of operating supply voltages : 7 V to 25 V • Output voltage setting accuracy : 4.2V ± 0.8% (per cell) • Built-in frequency setting capacitor enables frequency setting using external resistor only • Oscillator frequency range : 100kHz to 500kHz • Built-in current detector amplifier with wide in-phase input voltage range : 0 V to Vcc • In standby mode, leave output voltage setting resistor open to prevent inefficient current loss • Built-in standby current function : 0 µA (standard) • Built-in soft start function • Built-in totem-pole output stage supporting P-channel MOS FETs devices
The WCN3620 IC integrates three different Wireless connectivity technologies into a single device suitable for handsets and other mobile devices:
-Wireless local area network (WLAN) compliant with the IEEE 802.11 b/g/n specification
-Bluetooth (BT) compliant with the BT specification version 4.0 (BR/EDR+BLE)
-Worldwide FM radio, with Rx modes supporting the Radio Data System (RDS) for Europe and the Radio Broadcast Data System (RBDS) for the USA
The WCN3620 is a highly integrated IC using the 3.32 × 3.55 × 0.63 mm, 61-pin wafer-level nanoscale package (61 WLNSP) – and is supplemented by modem IC processing (such as the APQ8016 IC, a device in the APQ chipset family) to create a Wireless connectivity solution that reduces the part count and PCB area. The WCN3620 IC ensures hardware and software compatibility with companion Qualcomm® Atheros (QCA) chipsets to simplify the design cycle and reduce the OEM time-to-market cycle.
Outline This IC is a lithium ion battery charging control IC. It is a 1-chip charging IC that combines constant current, constant voltage charging and protection circuits such as pre-charge and pre-charge timer battery temperature detection, all in one. The quick charge timer and full charge detection function have been eliminated, as compared to MM1433, and charging ON/OFF is controlled externally.
Features 1. Output voltage (Ta = 0°C ~ +50°C) 4.120 ± 30mV 2. Consumption current 3.5mA typ. 3. Pre-charge function 4. Adaptor (primary side) abnormality detection function 5. Timer error time ±10% (not including external deviation) 6. Battery temperature detection function 7. Pre-charge timer
Applications Applications 1. Lithium ion battery charging control (with timer)
■ DESCRIPTION The MB3875 and MB3877 are charging DC/DC converter ICs suitable for down-conversion, which uses pulse width modulation (PWM) for controlling the output voltage and current independently. These ICs can dynamically control the secondary battery’s charge current by detecting a voltage drop in an AC adapter in order to keep its power constant (dynamically-controlled charging). The charging method enables quick charging, for example, with the AC adapter during operation of a notebook PC.
■ FEATURES • Detecting a voltage drop in the AC adapter and dynamically controlling the charge current (Dynamically-controlled charging) • High efficiency : 95 % • Wide range of operating supply voltages: 7 V to 25 V • Output voltage precision (Output voltage setting resistor integrated): 0 ± 0.8 % (Ta = + 25 °C) • High precision reference voltage source: 4.2 V ± 0.8 % • Support for frequency setting using an external resistor (Frequency setting capacitor integrated) :100 kHz to 500 kHz • On-chip current detector amplifier with wide in-phase input voltage range : 0 V to VCC • On-chip standby current function: 0 µA (Typ) • On-chip soft-start function • Internal totem-pole output stage supporting P-channel MOS FETs devices
Overview Today’s cell phones and other handheld devices provide ever increasing functionality and a richer user experience. As their functionality increases, the demand for battery power increases as well, which leads to adoption of highercapacity batteries. These higher-capacity batteries require high-current charging solutions, which can best be served with efficient PWM chargers.
Lithium-Ion battery charging is simplified with modern IC charging solutions. This application note provides a guide for how to use the FAN5400 and FAN5420 family of PWM chargers for high-current, fast-charging solutions to minimize the charging time while providing full compliance to modern battery safety specifications.