RT9526GQW

RT9526 RICHTEK | Alldatasheet

Document overview

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Technical content

Features

zzzzz 28V Maximum Rating for AC Adapter zzzzz Internal Integrated Power FETs zzzzz AC Adapter Power Good Status Indicator zzzzz Programmed Charging Current zzzzz Charge Status Indicator zzzzz Programmed End of Charge Current zzzzz Under Voltage Protection zzzzz Over Voltage Protection zzzzz Thermal Feedback Optimizing Charge Rate zzzzz RoHS Compliant and Halogen Free

Applications

Ordering Information

Note : Richtek 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. SOT-23-6 WDFN-8L 2x3 VIN ENB PGB BATT ISET IMIN GND CHG_SB GND ISET VIN ENB PGB BATT GND CHG_SB GND IMIN CHG_SB GND VIN IMIN ISET BATT 56RT9526 Package Type E : SOT-23-6 QW : WDFN-8L 2x2 (W-Type) QWA : WDFN-8L 2x3 (W-Type) Lead Plating System G : Green (Halogen Free and Pb Free)

DS9526-01 April 2011www.richtek.com Function Pin Description Pin No. SOT-26-6 WDFN-8L 2x2 / WDFN-8L 2x3 Pin Name Pin Function 3 1 VIN Supply Voltage Input. VIN can withstand up to 28V input. -- 2 PGB Power Good Indicator. This pin connects to VIN with 10SL N-MOSFET as power good condition. 1 3 CHG_SB Charge Status Indicator Output (Open drain). Indicate low when battery is charging; indicate high when battery charging finished or any fault happened. -- 4 ENB Charge Enable (Active Low). Connect this pin with 200k Ω pull low resistor. 2 5, 9 (Exposed Pad) GND Ground. The exposed pad must be soldered to a large PCB and connected to GND for maximum power dissipation. 6 6 IMIN EOC Current Setting Pin. 5 7 ISET Charge Current Set Point. 4 8 BATT Battery Charge Current Output. Typical Application Circuit Marking Information IMIN CHG_SB BATT ENB RT9526 CIN VINAdapter or USB GND COUT RISET VBATTPGBISET RIMIN VBATT EN= : Product Code DNN : Date CodeEX=DNN JJ : Product Code W : Date Code 04 : Product Code W : Date Code RT9526GE RT9526GQW RT9526GQWA JJW 04W

DS9526-01 April 2011 www.richtek.com Function Block Diagram CC/CV/TR Multi Loop Controller Logic 200k BATT CHG_SB GND PGB ENB ISET VIN IMINCurrent Set Block Sleep Mode OVP UVLO BASE EOC Set Block Switch Well VREF IBIAS

DS9526-01 April 2011 www.richtek.com Absolute Maximum Ratings (Note 1) z Power Dissipation, PD @ TA = 25°C z Package Thermal Resistance (Note 2) Recommended Operating Conditions (Note 3)

Electrical Characteristics

Parameter Symbol Test Conditions Min Typ Max Unit VIN POR Rising Threshold Voltage VPOR_H 3.4 3.8 4.2 V VIN POR Falling Threshold Voltage VPOR_H 3.1 3.5 3.9 V VIN − VBATT VOS Rising V OS_H -- 90 150 mV VIN − VBATT VOS Falling V POR_L 10 50 -- mV VIN Standby Current V BATT = 4.5V -- 300 500 μA BATT Sleep Leakage Current I SLEEP -- 1 5 μA Battery Regulation Voltage V REG 4.158 4.2 4.242 V VIN Power FET On-Resistance R DS(ON) I BA TT = 0.5A -- 0.6 -- Ω ISET Set Voltage (Fast Charge Phase) VISET -- 1.21 -- V Charge Current Accuracy R ISET = 29.4kΩ 135 150 165 mA BATT Pre-Charge Threshold V CHG_PRE 2.7 2.8 2.9 V BATT Pre-Charge Threshold Hysteresis ΔVCHG _PRE 40 100 150 mV Pre-Charge Current I CHG _PRE 12 16.7 21.3 % Logic-High V IH 1.5 -- -- ENB Input Threshold Voltage Logic-Low V IL VIN = 4.2V to 24V -- -- 0.4 V (VIN = 4.5V, TA = 25°C unless otherwise specified) To be continued

DS9526-01 April 2011www.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. θ JA is measured in natural convection at T A = 25 °C on a low-effective thermal conductivity single-layer te st board of JEDEC 51-3 thermal measurement standard. The measurement case position of θJC is on the exposed pad of the packages. Note 3. The device is not guaranteed to function outside its operating conditions. Parameter Symbol Test Conditions Min Typ Max Unit Thermal Regulation T REG -- 115 -- °C VIN Over Voltage Protection Threshold VOVP 10 11 13 V VIN OVP Hysteresis ΔVOVP -- 0.4 -- V PGB Pull Down Voltage 5mA -- 200 -- mV CHG_SB Pull Down Voltage 5mA -- 200 -- mV EOC Current Setting I IMIN R IMIN = 137kΩ 20 30 40 mA EOC Rising Threshold R IREF = 29.4kΩ 90 1 10 130 mA

DS9526-01 April 2011 www.richtek.com Typical Operating Characteristics Battery Regulation Voltage vs. Input Voltage 3.2 3.4 3.6 3.8 4.0 4.2 4.4 456789 1 0 1 1 Input Voltage (V) Battery Regulation Voltage (V) 1 IBATT = 20mA Charging Current vs. Input Voltage 100 105 110 115 120 125 130 135 140 145 150 155 Input Voltage (V) Charging Current (mA) 1 RISET = 24.9Ω VBATT = 3V VBATT = 3.7V Battery Regulation Voltage vs. Charge Current 4.10 4.12 4.14 4.16 4.18 4.20 4.22 4.24 4.26 4.28 4.30 0 100 200 300 400 500 Change Current (mA) Battery Regulation Voltage (V) 1 VIN = 5V Battery Current vs. Charging Time 0.00 0.02 0.04 0.06 0.08 0.10 0.12 0.14 0.16 0.18 0.20 0 5000 10000 15000 20000 25000 30000 35000 Charging Time (s) Battery Current (A) VIN = 5V, RISET = 29.4kΩ, RIMIN = 137kΩ Battery Current vs. Charging Time 0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 0 5000 10000 15000 20000 25000 30000 35000 Charging Time (s) Battery Voltage (V) VIN = 5V, RISET = 29.4kΩ, RIMIN = 137kΩ Charge Current vs. Battery Voltage 100 150 200 250 300 350 400 450 500 Battery Voltage (V) Charge Current (mA) RISET = 9.1k RISET = 29.4k RISET = 9.1k VIN = 5V

DS9526-01 April 2011www.richtek.com EOC Current vs. RISET 50 130 210 290 370 450 RIMIN (kΩ) EOC Current (mA) VIN = 5V, VBATT = 3.7V (kΩ) Charge Current vs. Temperature 100 120 140 160 180 -50 -25 0 25 50 75 100 125 Temperature (°C) Charge Current (mA) VIN = 5V, VBATT = 3.7V, RISET = 29.4kΩ Charge Current vs. RISET 100 200 300 400 500 600 700 800 900 1000 1100 1200 3 1 32 33 34 35 36 3 RISET (kΩ) Charging Current (mA) 1 VIN = 5V, VBATT = 3.7V kΩ

DS9526-01 April 2011 www.richtek.com KSET = 3640; VSET = 1.21 (typ.) c. Battery Voltage Regulation (CV Mode) The battery voltage regulation feedback is through the BATT pin. The RT9526 monitors the battery voltage between the BATT and GND pins. When battery voltage is close to battery regulation voltage threshold, the voltage regulation phase begins and the charging current begins to taper down. When battery voltage is over battery regulation voltage threshold and charge mode stops, the RT9526 still monitors the battery voltage. Charge current is resumed when the battery voltage falls under battery regulation voltage threshold. Sleep Mode The RT9526 enters sleep mode if both AC and USB are removed from the input. This feature prevents draining the battery during the absence of input supply.

Application Information

The RT9526 is a fully integrated low cost single cell Li-ion battery charger operable in Constant Current (CC) mode or Constant Voltage (CV) mode. The CC mode current is set with the external resistor, R ISET, and the CV mode voltage is fixed at 4.2V. If the battery voltage is below a typical 2.8V pre-charge threshold, the RT9526 charges the battery with a trickle current until the battery voltage rises above the pre-charge threshold. The RT9526 is capable of being powered up from AC adapter and USB (Universal Serial Bus) port inputs. VIN Over Voltage Protection The input voltage is monitored by the internal comparator. The OVP threshold is set at 11V (typ.). When the input voltage exceeds the threshold, the controller outputs a logic signal to turn off the power P-MOSFET to prevent high input voltage from damaging the electronics in the handheld system. Nevertheless, an AC input voltage over 28V will still damage the RT9526. When the input over voltage condition is removed, the controller will enable the output again by running through soft-start. Charger Enable Input ENB is an active-low logic input to enable the charger. Drive the ENB pin low or leave it floating to enable the charger. This pin has a 200kΩ internal pull down resistor. So when left floating, the input is equivalent to logic-low. Drive this pin high to disable the charger. Battery Charge Profile The RT9526 charges a Li-ion battery under Constant Current (CC) mode or Constant Voltage (CV) mode. The constant current of ISET is set via the external resistor, R ISET, and the constant voltage is fixed at 4.2V. If the battery voltage is below a typical 2.8V pre-charge threshold, the RT9526 charges the battery with a trickle current until the battery voltage rises above the pre-charge threshold. When the battery voltage reaches 4.2V, the charger enters CV mode and regulates the battery voltage at 4.2V to fully charge the battery without the risk of over charge. CVCCTrickle 4.2V ICHG_FAST 2.8V 16.7 % ICHG_FAST CHG_SB CHG Indication IIMIN Charge Current 75 % ICHG_FAST Time Charge Voltage Figure 1. Typical Charge Profile

DS9526-01 April 2011www.richtek.com Power Good This open-drain output pin is used to indicate the input voltage status. The PGB output asserts low when 1. VIN > VPOR 3. VIN < VOVP It can be used to drive an LED or communicate to the host processor. Note that ON indicates the open-drain transistor is turned on and LED is bright. CHG_SB Indication The CHG_SB pin is an open-drain output capable to at least 10mA current when the charger starts to charge and turns off when the EOC current is reached. The CHG_SB signal is interfaced either with a micro processor GPIO or an LED for indication. End-Of-Charge Current (EOC) Connect a resistor between the IMIN pin and GND to set the EOC current. The EOC current level, I IMIN , is programmable via the external resistor, RIMIN, as shown in the following equation : IMIN IMIN 4148I = R (mA) Upon reaching the End-Of-Charge (EOC) current, the charger indicates charge completion via the CHG_SB pin, but the charger continues to output 4.2V voltage. Figure 1 shows the typical charge profile and the EOC/reset event. The CHG_SB signal asserts low when the trickle charge starts and changes to high at EOC. After EOC is reached, the charge current has to rise above 75% of I CHG_FAST before the CHG_SB signal is allowed to turn on again. A current surge after EOC may occur due to a load connected to the battery. Temperature Regulation and Thermal Protection In order to maximize charge rate, the RT9526 features a junction temperature regulation loop. If the power dissipation of the IC results in junction temperature greater than the thermal regulation threshold (115°C), the RT9526 will cut back on the charge current and disconnect the battery in order to maintain thermal regulation at around 115°C. This operation continues until the junction temperature falls below thermal regulation threshold (115°C) by the hysteresis level. This feature prevents the maximum power dissipation from exceeding typical design conditions. Selecting the Input and Output Capacitors In most applications, a 1 μF high frequency decoupling capacitor placed in close proximity to the input is sufficient. However, depending on the power supply characteristics and cable length, it may be necessary to add an additional 10μF ceramic capacitor to the input. For the RT9526, a small output capacitor is required for loop stability. A 1μF ceramic capacitor placed between the BATT pin and GND is typically sufficient. Thermal Considerations For recommended operating condition specifications of the RT9526, the maximum junction temperature is 125°C and T A is the ambient temperature. The junction to ambient thermal resistance, θJA, is layout dependent. For SOT-23-6 packages, the thermal resistance, θJA, is 250°C/W on a standard JEDEC 51-3 single-layer thermal test board. For WDFN-8L 2x2 packages, the thermal resistance, θ JA, is 165°C/W on a standard JEDEC 51-3 single-layer thermal test board. For WDFN-8L 2x3 packages, the thermal resistance, θ JA, is 120°C/W on a standard JEDEC 51-3 single-layer thermal test board. The maximum power dissipation at T A = 25°C can be calculated by the following formula : PD(MAX) = (125 °C − 25 °C) / (250 °C/W) = 0.400W for SOT-23-6 package PD(MAX) = (125 °C − 25 °C) / (165 °C/W) = 0.606W for WDFN-8L 2x2 package PD(MAX) = (125 °C − 25 °C) / (120 °C/W) = 0.833W for WDFN-8L 2x3 package The maximum power dissipation depends on the operating ambient temperature for fixed T J (MAX) and thermal resistance, θJA. For the RT9526 packages, the derating curves in Figure 2 allow the designer to see the effect of rising ambient temperature on the maximum power dissipation.

DS9526-01 April 2011www.richtek.com Outline Dimension A e b B D C H L SOT-23-6 Surface Mount Package Dimensions In Millimeters Dimensions In Inches Symbol Min Max Min Max A 0.889 1.295 0.031 0.051 A1 0.000 0.152 0.000 0.006 B 1.397 1.803 0.055 0.071 b 0.250 0.560 0.010 0.022 C 2.591 2.997 0.102 0.118 D 2.692 3.099 0.106 0.122 e 0.838 1.041 0.033 0.041 H 0.080 0.254 0.003 0.010 L 0.300 0.610 0.012 0.024

DS9526-01 April 2011 www.richtek.com W-Type 8L DFN 2x2 Package Dimensions In Millimeters Dimensions In Inches Symbol Min Max Min Max A 0.700 0.800 0.028 0.031 A1 0.000 0.050 0.000 0.002 A3 0.175 0.250 0.007 0.010 b 0.200 0.300 0.008 0.012 D 1.950 2.050 0.077 0.081 D2 1.000 1.250 0.039 0.049 E 1.950 2.050 0.077 0.081 E2 0.400 0.650 0.016 0.026 e 0.500 0.020 L 0.300 0.400 0.012 0.016 1 122 Note : The configuration of the Pin #1 identifier is optional, but must be located within the zone indicated. DETAIL A Pin #1 ID and Tie Bar Mark Options D E A L be SEE DETAIL A

DS9526-01 April 2011www.richtek.com Information that is provided by Richtek Technology Corporation is believed to be accurate and reliable. Richtek reserves the right to make any change in circuit design, specification or other related things if necessary without notice at any time. No third party intellectual property infringemen t of the applications should be guaranteed by users when integrating Richtek products into any application. No legal responsibility for any said applications is assumed b y Richtek. 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) 5F, No. 95, Minchiuan Road, Hsintien City Taipei County, Taiwan, R.O.C. Tel: (8862)86672399 Fax: (8862)86672377 Email: marketing@richtek.com Dimensions In Millimeters Dimensions In Inches Symbol Min Max Min Max A 0.700 0.800 0.028 0.031 A1 0.000 0.050 0.000 0.002 A3 0.175 0.250 0.007 0.010 b 0.200 0.300 0.008 0.012 D 1.900 2.100 0.075 0.083 D2 1.550 1.650 0.061 0.065 E 2.900 3.100 0.1 14 0.122 E2 1.650 1.750 0.065 0.069 e 0.500 0.020 L 0.350 0.450 0.014 0.018 W-Type 8L DFN 2x3 Package 1 122 Note : The configuration of the Pin #1 identifier is optional, but must be located within the zone indicated. DETAIL A Pin #1 ID and Tie Bar Mark Options D E A L be SEE DETAIL A