LP3910

LP3910 Power Management IC for Hard Drive Based Portable Media Players ADVANCE INFORMATION November 2006 LP3910 Power Management IC for Hard Drive Based Portable Media Players General Description The LP3910 is a programmable system power management unit that is optimized for HDD-based Portable Media Players. The LP3910 incorporates 2 low-dropout LDO voltage regulators, 2 integrated Buck DC/DC converters with Dynamic Voltage Scaling (DVS), 1 wide load range Buck-Boost DC/DC converter with programmable output voltage, a 4-channel 8bit A/D converter and a dual source Li-Ion/polymer battery charger. The charger has the capability to charge and maintain a single cell battery from a regulated wall adapter or USB power. When both USB and adapter sources are present, then the adapter source takes precedence and switching between USB and adapter power sources is seamless. In addition, the battery charger supports power routing, which allows system usage immediately after an external power source has been detected. The LP3910 also incorporates some advanced battery management functions such as battery temperature measurement, reverse current blocking for USB, LED charger status indication, thermally regulated internal power FETs, battery voltage monitoring, over-current protection and a 10 hour safety timer. The Buck-Boost DC/DC converter targets the power management of Hard Disk Drives and maintains a typical operating voltage of 3.3V ±5% with a battery voltage below or above this output level. The Buck-Boost output voltage can be selected to be as low as 1.8V. The 4-channel A/D converter measures the battery voltage and charge current, which can be used for fuel gauging. Two undedicated channels can be used to measure other analog parameters such as discharge current, battery temperature, keyboard resistor scanning and more. The various IC parameters are programmable through a 400 kHz I2C compatible interface. The LP3910 is available in a thermally-enhanced 6x6x0.8 mm 48 LLP package and operates over an ambient temperature range of –40°C to +85°C. Features ■ 2 low-dropout regulators -- LDO1 is used for general purpose applications, LDO2 is used for low-noise analog applications. Both LDOs have programmable output voltages. Green and Red LED charger status drivers 4-channel 8-bit dual slope a/d converter 2 High-efficiency DVS Buck converters Wide load range Buck-Boost DC/DC converter 400 kHz I2C compatible interface Linear constant-current / constant-voltage charger for single cell lithium-ion batteries USB and Adapter charging System power supply management 6x6x0.8mm 48 LLP package Voltage and thermal supervisory circuits Continuous battery voltage monitoring Interrupt Request output with 8 sources ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ Key Specifications ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ LDO1: 150 mA, 1.2V–3.3V LDO2: 150 mA, 1.3V–3.3V Buck1: 600 mA, 0.8V–2.0V Buck2: 600 mA, 1.8V–3.3V Buck-Boost: 1000 mA, 1.8V–3.3V 50 mΩ battery path resistance 100 mA–1000 mA full-rate charge current using wall adapter Selectable 0.05C and 0.1C EOC current USB current limit of 100 mA, 500 mA, and 800 mA USB pre-qual current of 50 mA Selectable 4.1V, 4.2V or 4.38V battery termination voltages 0.35% battery termination accuracy ±1 LSB INL/DNL on 8-bit a/d converter Applications ■ Hard drive-based MP3 players ■ Portable media players ■ Portable gaming devices © 2006 National Semiconductor Corporation 202123 www.national.com LP3910 Typical Application Circuit 20212301 FIGURE 1. Application Diagram www.national.com 2 LP3910 Connection Diagram Device Connection Diagram 20212302 48 LLP Package (Top View) SQF48A The physical placement of the package marking will vary from part to part. (*) UZXYTT format: ‘U’ – wafer fab code; ‘Z’ – assembly code; ‘XY’ 2 digit date code; ‘TT’ – die run code See http://www.national.com/quality/marking_conventions.html for more information on marking information. Ordering Information Order Number LP3910SQ-AA LP3910SQX-AA Package Type 48-lead LLP 48-lead LLP NSC Package Drawing SQF48A SQF48A Top Mark LP3910SQ-AA LP3910SQX-AA Supplied As 250 tape & reel 3000 tape & reel Device Default Options Order Number LP3910SQ-AA LP3910SQX-AA LDO1 2.0V 2.0V LDO2 3.3V 3.3V Buck1 1.2V 1.2V Buck2 3.3V 3.3V BuckBoost 3.3V 3.3V Other Options Standard Defaults Standard Defaults 3 www.national.com LP3910 Physical Dimensions inches (millimeters) unless otherwise noted SQF48A Package: 6x6x0.8mm 48-Pin LLP Package with 0.4mm Pitch www.national.com 4 LP3910 Notes 5 www.national.com LP3910 Power Management IC for Hard Drive Based Portable Media Players Notes THE CONTENTS OF THIS DOCUMENT ARE PROVIDED IN CONNECTION WITH NATIONAL SEMICONDUCTOR CORPORATION (“NATIONAL”) PRODUCTS. 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