RT9501

RT9501A_07 RICHTEK | Alldatasheet

Document overview

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Technical content

Features

zzzzz For Single Lithium-Ion or Lithium-Polymer Cell Battery Pack (4.1V or 4.2V) zzzzz A Few External Components are Required zzzzz Precharge, Constant Current, Constant Voltage Modes zzzzz Battery Temperature Monitor zzzzz Charge Status Indication zzzzz Automatic Battery Recharge zzzzz Charge Termination Detect zzzzz Auto Low Power Sleep Mode when VDD Power is Removed zzzzz MSOP-8 Package zzzzz RoHS Compliant and 100% Lead (Pb)-Free Pin Configurations Advanced Lithium-Ion Linear Battery Charger

Ordering Information

The RT9501 is a single Lithium-Ion or Lithium-Polymer cell linear battery charger which is designed for compact and cost-sensitive handheld devices. It combines charge status indication, charge termination, battery temperature monitoring, and high accuracy current and voltage regulation in a MSOP-8 package. The RT9501 charges the battery in three modes, precharge, constant current, constant voltage. If the battery voltage is below the precharge threshold V O(MIN), the RT9501 precharges the battery with a lower conditioning current. After precharge, the RT9501 applies a constant current to the battery. An external sense- resister sets the charge current. The constant voltage mode continues until the battery reaches the regulation voltage. The battery temperature is continuously measured by an external thermistor through the TS pin. The RT9501 inhibits charge until the temperature is within the range defined by users.

Applications

(TOP VIEW) MSOP-8 VDD BATT CS FB/CE CCGND STAT TS Marking Information For marking information, contact our sales representative directly or through a RichTek distributor located in your area, otherwise visit our website for detail. Note : RichTek Pb-free and Green products are : \RoHS compliant and compatible with the current require- ments of IPC/JEDEC J-STD-020. \Suitable for use in SnPb or Pb-free soldering processes. \`100%matte tin (Sn) plating. RT9501 Package Type F : MSOP-8 Voltage Version A : 4.1V B : 4.2V Operating Temperature Range P : Pb Free with Commercial Standard G : Green (Halogen Free with Commer- cial Standard)

DS9501A/B-07 March 2007 www.richtek.com Function Block Diagram Functional Pin Description Pin Name Pin Function VDD Supply Voltage Input. TS Temperature Sense Input. Input from battery temperature monitoring circuit. STAT Charge Status Output. 3-state status indication of charge, charge complete and temperature fault or disable or sleep mode. GND Ground. CC Charge Control Output. Current output to drive on external PNP transistor or P-Channel MOSFET for current and voltage regulation. FB/CE External Feedback Input or Charge Enable Function. Input from controller or finely adjust the battery regulated voltage with external voltage divider. CS Current Sense Input. Charge current is sensed according to the voltage drop from supply voltage to this pin. BATT Battery Voltage input. Input directly from battery voltage. Control Logic Internal FB Feedback Determination & Enable Control VDD VDD VREF1 VREF2 VREF3 VREF4 FB2 FB2 FB2 CC CS STAT FB2 BATT VDD FB/CE FB2 Sleep Mode Detection CC Control CV Control Precharge Recharge TS1 Trip TS2 Trip GND TS

DS9501A/B-07 March 2007www.richtek.com

Electrical Characteristics

Recommended Operating Conditions (Note 3) Absolute Maximum Ratings (Note 1) z Power Dissipation, PD @ TA = 25°C z Package Thermal Resistance z ESD Susceptibility (Note 2) (TA = 25 °C, unless otherwise specification) Parameter Symbol Test Condition Min Typ Max Units Operating Current IDD(OPE) 4.5V < VDD < 7V, Excluding external loads -- 1 2 mA VDD Sleep Current I DD(SLP) V BATT −VDD ≥ 0.2V -- -- 3 μA Input Bias Current @ BATT pin IBATT VBATT = VO(REG), VBATT − VDD ≥ 0.2V -- 1.5 2.5 μA Input Bias Current @ CS pin ICS V CS = 5V, VBATT − VDD ≥ 0.2V -- -- 1 μA Input Bias Current @ TS pin ITS V TS = 5V, VBATT − VDD ≥ 0.2V -- -- 1 μA Input Bias Current @ FB/CE pin ICE V CE = 5V, VBATT − VDD ≥ 0.2V -- -- 1 μA Input Low Voltage @ CE pin VCE -- -- 1.5 V Input High Voltage @ CE pin VCE VDD–1.5 -- -- V Feedback Voltage @ FB pin VFB 2.048 2.10 2.152 V RT9501A 4.059 4.10 4.141 V Output Voltage VO(REG) RT9501B 4.158 4.20 4.242 V Current Regulation Threshold VI(SNS) V I(SNS) = VDD – VCS 100 110 121 mV Charge Terminated Current Detect Threshold V(TERM) 2 12 22 mV Lower Temperature Threshold VTS1 29.1 30 30.9 %VDD Upper Temperature Threshold VTS2 58.3 60 61.8 %VDD Precharge Threshold VO(MIN) 2.8 2.9 3.0 V Precharge Current Regulation V(PRE) 4 14 24 mV Recharge Threshold VO(RCH) VO(REG) – 140mV V O(REG)– 100mV VO(REG) – 60mV V To be continued

DS9501A/B-07 March 2007 www.richtek.com Note 1. Stresses listed as the above “Absolute Maximum Ratings” may cause permanent damage to the device. These are for stress ratings. 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 remain possibility to affect device reliability. Note 2. Devices are ESD sensitive. Handling precaution recommended. Note 3. The device is not guaranteed to function outside its operating conditions. Parameter Symbol Test Condition Min Typ Max Units Output (Low) Voltage @ STAT pin VSTAT(LOW) IOL = 10mA -- 0.4 0.6 Output (High) Voltage @ STAT pin VSTAT(HIGH) IOH = 5mA V DD–0.5 -- -- V Output Low Voltage @ CC pin VCC(LOW) I O(CC) = 5mA ( sink ) -- -- 1.5 V Sink current @ CC pin ICC(SINK) Not to exceed power rating specification (PD) 5 -- 40 mA

(SNS) is the constant regulation current. rated for the maximum power dissipation. when the battery is disconnected. Figure 8. For FB pin Function

DS9501A/B-07 March 2007 www.richtek.com Richtek Technology Corporation Headquarter 5F, No. 20, Taiyuen Street, Chupei City Hsinchu, Taiwan, R.O.C. Tel: (8863)5526789 Fax: (8863)5526611 Richtek Technology Corporation Taipei Office (Marketing) 8F, No. 137, Lane 235, Paochiao Road, Hsintien City Taipei County, Taiwan, R.O.C. Tel: (8862)89191466 Fax: (8862)89191465 Email: marketing@richtek.com Outline Dimension L D E E1 e A b 8-Lead MSOP Plastic Package Dimensions In Millimeters Dimensions In Inches Symbol Min Max Min Max A 0.810 1.100 0.032 0.043 A1 0.000 0.150 0.000 0.006 A2 0.750 0.950 0.030 0.037 b 0.220 0.380 0.009 0.015 D 2.900 3.100 0.114 0.122 e 0.650 0.026 E 4.800 5.000 0.189 0.197 E1 2.900 3.100 0.114 0.122 L 0.400 0.800 0.016 0.031