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MAX8903YETIT Datasheet(PDF) 1 Page - Maxim Integrated Products |
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MAX8903YETIT Datasheet(HTML) 1 Page - Maxim Integrated Products |
1 / 30 page General Description The MAX8903A–MAX8903E/MAX8903G/MAX8903H/ MAX8903J/MAX8903Y are integrated 1-cell Li+ charg- ers and Smart Power Selectors™ with dual (AC adapter and USB) power inputs. The switch mode charger uses a high switching frequency to eliminate heat and allow tiny external components. It can operate with either separate inputs for USB and AC adapter power, or from a single input that accepts both. All power switches for charging and switching the load between battery and external power are included on-chip. No external MOSFETs, blocking diodes, or current-sense resistors are required. The MAX8903_ features optimized smart power control to make the best use of limited USB or adapter power. Battery charge current and SYS output current limit are independently set. Power not used by the system charges the battery. Charge current and SYS output cur- rent limit can be set up to 2A while USB input current can be set to 100mA or 500mA. Automatic input selection switches the system from battery to external power. The DC input operates from 4.15V to 16V with up to 20V pro- tection, while the USB input has a range of 4.1V to 6.3V with up to 8V protection. The MAX8903_ internally blocks current from the bat- tery and system back to the DC and USB inputs when no input supply is present. Other features include pre- qual charging and timer, fast charge timer, overvoltage protection, charge status and fault outputs, power-OK monitors, and a battery thermistor monitor. In addition, on-chip thermal limiting reduces battery charge rate and AC adapter current to prevent charger overheat- ing. The MAX8903_ is available in a 4mm x 4mm, 28-pin thin QFN package. The various versions of the MAX8903_ allow for design flexibility to choose key parameters such as system regulation voltage, battery prequalification threshold, and battery regulation voltage. The MAX8903B/ MAX8903E/MAX8903G also includes power-enable on battery detection. See the Selector Guide section for complete details. Applications Features o Efficient DC-DC Converter Eliminates Heat o 4MHz Switching for Tiny External Components o Instant On—Works with No/Low Battery o Dual Current-Limiting Inputs—AC Adapter or USB Automatic Adapter/USB/Battery Switchover to Support Load Transients 50m Ω System-to-Battery Switch Supports USB Spec o Thermistor Monitor o Integrated Current-Sense Resistor o No External MOSFETs or Diodes o 4.1V to 16V Input Operating Voltage Range 2A 1-Cell Li+ DC-DC Chargers for USB and Adapter Power ________________________________________________________________ Maxim Integrated Products 1 19-4410; Rev 4; 5/11 For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com. EVALUATION KIT AVAILABLE Pin Configuration appears at end of data sheet. Selector Guide appears at end of data sheet. CHARGE AND SYS LOAD SWITCH DC SYS BAT AC ADAPTER OR USB SYSTEM LOAD BATTERY GND USB USB CHARGE CURRENT LOAD CURRENT LX CS PWM STEP-DOWN MAX8903_ Typical Operating Circuit Smart Power Selector is a trademark of Maxim Integrated Products, Inc. PDAs, Palmtops, and Wireless Handhelds Personal Navigation Devices Smart Cell Phones Portable Multimedia Players Mobile Internet Devices Ultra Mobile PCs Ordering Information + Denotes a lead(Pb)-free/RoHS-compliant package. * EP = Exposed pad. ** Future product—contact factory for availability. T = Tape and reel. PART TEMP RANGE PIN-PACKAGE MAX8903AETI+T -40°C to +85°C 28 Thin QFN-EP* MAX8903BETI+T -40°C to +85°C 28 Thin QFN-EP* MAX8903CETI+T -40°C to +85°C 28 Thin QFN-EP* MAX8903DETI+T -40°C to +85°C 28 Thin QFN-EP* MAX8903EETI+T -40°C to +85°C 28 Thin QFN-EP* MAX8903GETI+T -40°C to +85°C 28 Thin QFN-EP* MAX8903HETI+T -40°C to +85°C 28 Thin QFN-EP* MAX8903JETI+T** -40°C to +85°C 28 Thin QFN-EP* MAX8903YETI+T -40°C to +85°C 28 Thin QFN-EP* |
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