RT9709

RT9709 RICHTEK | Alldatasheet

Document overview

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Technical content

Features

zzzzz Fully Integrated Protection Circuit for Three Protection Variables \\\\\ User Programmable OCP Threshold \\\\\ Input OVP Less than 1us zzzzz Up to 30V Over Voltage Protection zzzzz High Accuracy Protection Threshold zzzzz High Immunity of False Triggering Under Transients zzzzz Warning Indication Output zzzzz Enable Input zzzzz Thermally Enhanced WDFN Package zzzzz RoHS Compliant and Halogen Free

Applications

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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. Pin Configurations (TOP VIEW) WDFN-10L 3x3 VIN VIN NC VOUT VOUT ILIM VB GND WRN EN11 GND WDFN-12L 4x3 GND VIN VIN NC WRN GND NC VOUT VOUT ILIM VB EN NC RT9709 Package Type QW : WDFN-12L 4x3 (W-Type) QWB : WDFN-10L 3x3 (W-Type) Lead Plating System G : Green (Halogen Free and Pb Free) OVP Default : 6.8V A : 5.85V B : 6.25V

DS9709-02 April 2011www.richtek.com Function Block Diagram Pin No. WDFN-12L 4x3 WDFN-10L 3x3 Pin Name Pin Function 1, 2 1, 2 VIN Input Power Source Pin. 3 3 GND Ground Pin. 4 4 WRN This is an open-drain logic output that turns LOW when any protection event occurs. 5, 6, 12 5 NC No Internal Connection. 7 6 EN Enable Input Pin. Pull this pin to low or leave it floating to enable the IC. Force this pin to high to disable the IC. 8 7 VB Battery Voltage Monitoring Input Pin. This pin is connected to the battery pack positive terminal via resistor. 9 8 ILIM Over-Current Protection Threshold Setting Pin. Connect a resistor between this pin and GND to set the OCP threshold. 10, 1 1 9, 10 VOUT Output Voltage Pin. Output through the MOSFET. 13 (Expose Pad) 11 (Exposed Pad) GND The exposed pad must be soldered to a large PCB and connected to GND for maximum thermal dissipation. Functional Pin Description Typical Application Circuit Control Logic Driver OCP OCP Seting BATOVP Buffer OTP UVLO INOVP BASE VREF Ibias VDD EN Logic WRN GND VOUT ILIM VB VIN EN RT9709/A/B VIN VIN NC WRN GND VOUT VOUT ILIM VB EN VIN CIN Charger RVB RILIMIT BatteryWRN EN

DS9709-02 April 2011 www.richtek.com

Electrical Characteristics

Parameter Symbol Test Conditions Min Typ Max Units Power- On Reset RT9709 4.3 -- 6.5 V RT9709A 4.3 -- 5.5 V Operation Voltage RT9709B VIN 4.3 -- 5.9 V VIN Rising 2.4 2.6 2.7 V Under Voltage Lockout Threshold V UVLO Hysteresis -- 100 -- mV Quiescent Current I Q When Enable, V EN < 0. 4V -- 0.5 1 mA Shutdown Current I Q_SD When Disable, V EN > 1.5V 30 60 100 uA Protections RT9709 6.65 6.8 7.0 V RT9709A 5.65 5.85 6.0 V Input OVP Reference Voltage RT9709B VOVP 6 6.25 6.5 V Input OVP Hysteresis -- 60 100 mV Input OVP Propagation Delay V OU T = VIN x 80% -- -- 1 us Over Current Protection I OCP 0.93 1 1.07 A Over Current Protection Blanking Time BTOCP -- 170 -- us To be continued Recommended Operating Conditions (Note 4) Absolute Maximum Ratings (Note 1) z Power Dissipation, PD @ TA = 25°C z Package Thermal Resistance (Note 2) z ESD Susceptibility (Note 3) (VIN = 5V, CIN = 1uF, TA = 25°C, unless otherwise specified)

DS9709-02 April 2011www.richtek.com Note 1. Stresses beyond those listed under “Absolute Maximum Ratings ” may cause permanent damage to the device. These are stress ratings only, and 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 affect device reliability. Note 2. θJA is measured in the natural convection at TA = 25°C on a high effective four layers thermal conductivity test board of JEDEC 51-7 thermal measurement standard. The case position of θJC is on the exposed pad of the packages. Note 3. Devices are ESD sensitive. Handling precaution is recommended. Note 4. The device is not guaranteed to function outside its operating conditions. Parameter Symbol Test Conditions Min Typ Max Units Threshold 4.3 4.35 4.4 V Battery Over Voltage Protection VB OVP Hysteresis -- 30 -- mV Battery OVP Blanking time BT OVP -- 180 -- us VB Pin Leakage Current V VB = 4.4V -- -- 100 nA Rising -- 140 -- °C OTP Threshold T SD Falling -- 90 -- °C Logic Logic-High Voltage V IH 1.5 -- -- V EN/ Threshold Logic-Low Voltage V IL -- -- 0.4 V EN/ Internal Pull Down Resistor 100 200 400 k Ω WRN/ Output Logic Low Sink 5mA -- 0.35 0.8 V WRN Output Logic High Leakage Current -- -- 1 uA Power MOSFET On Resistance (P-MOSFET) R ON1 I OUT = 500mA, 4.3V < VIN < 6.5V -- 200 400 m Ω

DS9709-02 April 2011 www.richtek.com Typical Operating Characteristics CIN = COUT = 1uF Power On from V IN Time (2.5ms/Div) WRN (2V/Div) VOUT (5V/Div) VIN (5V/Div) CIN = COUT = 1uF Power Off from V IN Time (250us/Div) WRN (2V/Div) VOUT (5V/Div) VIN (5V/Div) IOUT (500mA/Div) CIN = COUT = 1uF Input OVP Time (100ms/Div) WRN (5V/Div) VOUT (5V/Div) VIN (10V/Div) IOUT (1A/Div) Battery OVP Time (100ms/Div) WRN (2V/Div) VBATT (5V/Div) VACIN (5V/Div) IOUT (500mA/Div) VIN = 5.5V, CIN = COUT = 1uF VIN = 5.5V, CIN = COUT = 1uF OCP Time (100ms/Div) WRN (2V/Div) VOUT (10V/Div) VIN (5V/Div) IOUT (1A/Div) Quiescent Current vs. Input Voltage 100 200 300 400 500 600 Input Voltage (V) Quiescent Current (uA) CIN = COUT = 1uF Enable Disable

DS9709-02 April 2011www.richtek.com OCP Threshold vs. Temperature 0.95 0.97 0.99 1.01 1.03 1.05 -40 -20 0 20 40 60 80 100 120 Temperature OCP Threshold (A) VIN = 5.5V, RSET = 25kΩ, CIN = COUT = 1uF (°C) Battery OVP Threshold vs. Input Voltage 4.20 4.23 4.25 4.28 4.30 4.33 4.35 4.38 4.40 Input Voltage (V) Battery OVP Threshold (V) CIN = COUT = 1uF OCP Threshold vs. Inputt Voltage 0.95 0.97 0.99 1.01 1.03 1.05 Inputt Voltage (V) OCP Threshold (A) RSET = 25kΩ, CIN = COUT = 1uF EN Threshold Voltage vs. Input Voltage 0.85 0.86 0.87 0.88 0.89 0.90 0.91 0.92 0.93 0.94 0.95 Input Voltage (V) EN Threshold Voltage (V) CIN = COUT = 1uF Rising Falling Quiescent Current vs. Temperature 100 200 300 400 500 600 700 -40 -20 0 20 40 60 80 100 120 Temperature Quiescent Current (uA) Enable Current Disable Current VIN = 5.5V, CIN = COUT = 1uF (°C) Battery OVP Threshold vs. Temperature 4.20 4.23 4.25 4.28 4.30 4.33 4.35 4.38 4.40 -40 -20 0 20 40 60 80 100 120 Temperature Battery OVP Threshold (V ) VIN = 5.5V, CIN = COUT = 1uF (°C)

DS9709-02 April 2011 www.richtek.com RDS(ON) vs. Input Voltage 0.15 0.17 0.19 0.21 0.23 0.25 0.27 0.29 Input Voltage (V) RDS(ON) (Π) CIN = COUT = 1uF RDS(ON) (Ω) Input OVP Threshold vs. Temperature 6.70 6.71 6.72 6.73 6.74 6.75 6.76 6.77 6.78 6.79 6.80 -40 -20 0 20 40 60 80 100 120 Temperature Input OVP Threshold (V) CIN = COUT = 1uF (°C) RDS(ON) vs. Temperature 0.00 0.05 0.10 0.15 0.20 0.25 0.30 0.35 0.40 0.45 -40 -20 0 20 40 60 80 100 120 Temperature RDS(ON) (Π)RDS(ON) (Ω) (°C) VIN = 5.5V, CIN = COUT = 1uF

DS9709-02 April 2011www.richtek.com Applications Information Power Up The RT9709 has an input under voltage lockout (UVLO) threshold of 2.6V with a built-in hysteresis of 100mV. Before the input voltage reaches the UVLO threshold, the RT9709 is off. When the input voltage is over the UVLO threshold; the RT9709 will delay for 10ms and after the 10ms delay, the soft-start will be activated. The 10ms delay allows any transients at the input during a hot insertion of the power supply to settle down before the IC starts to operate. During the soft-start transition, the RT9709 slowly turns on the internal MOSFET to reduce the inrush current. Enable Control The RT9709 offers an enable (EN) input. When the EN pin is pulled to logic high (>1.5V), the RT9709 will be shut down. When the EN pin is pulled to logic low (<0.4V), the RT9709 will be powered on.The EN pin has an internal pull-down resistor so that leaving the EN pin floating can enable the IC. Warning Indication Output The WRN pin is an open-drain output that indicates a LOW signal when any protection event occurs (Input OVP, Output OCP, OTP and Battery OVP). When the protection events are released and then the WRN pin indicates a HIGH signal. The 4-bit binary counters for the battery OVP and the OCP are reset to zero when the IC is re-enabled. Over Temperature Protection (OTP) The RT9709 monitors its own internal temperature to prevent thermal failures. The chip turns off the MOSFET when the internal temperature reaches 140 °C with a built-in hysteresis of 50°C. The IC will resume to normal operation until the internal temperature falls to 90°C. Input Over Voltage Protection The RT9709 monitors the input voltage to prevent the input over voltage leading to output system failures. The input OVP threshold is set to 6.8V for the RT9709. When the input voltage exceeds the threshold, the RT9709 outputs a logic signal to turn off the internal MOSFET within 1us to prevent the device in the handheld system from damaging. The hysteresis of the input OVP threshold is 100mV. When the input voltage is reduced to the normal operation voltage range, the RT9709 will re-enable the MOSFET. Battery Over Voltage Protection The RT9709 monitors the battery voltage by the VB pin. When the battery voltage exceeds the 4.35V battery OVP threshold, the RT9709 has a built-in 180us blanking time to prevent any transient voltage from triggering the battery OVP. If the OVP situation still exists after 180us, the internal MOSFET will be turned off and the WRN pin indicates a LOW signal. The battery OVP threshold has a 30mV built-in hysteresis. The control logic contains a 4- bit binary counter. If the battery over voltage event occurs for consecutive 16 times, the MOSFET will be turned off permanently. The OVP latch status can be reset by the EN pin. Selecting R VB The RT9709 monitors the battery voltage by the VB pin. The RT9709 will be turned off when the battery voltage exceeds the 4.4V battery OVP threshold. The VB pin is connected to the battery pack positive terminal via an isolation resistor (R VB) and the resistor is an important component. The RVB determines some parameters such as battery OVP threshold error and VB pin leakage current. Generally, it is necessary to decrease the R VB for reducing the battery OVP threshold error. However, this will increase the VB pin leakage current. So, it is an important issue to get a trade-off between the battery OVP threshold error and the VB pin leakage current, the allowable resistance of the R VB is 200kΩ to 1MΩ. Over Current Protection (OCP) The RT9709 monitors the output current to prevent the output short or the charging of the battery with an excessive current. The OCP (Over Current Protection) threshold can be set by the ILIM pin. The RT9709 has a built-in 170us delay time to prevent any transient noise triggering from the OCP. If the OCP situation still exists for 170us, the internal MOSFET will be turned off and the WRN pin indicates a LOW signal. When the OCP happens for consecutive 16 times, the internal MOSFET will be turned off permanently unless the input power is recycled or the enable pin is toggled.

Figure 1. Derating Curves for RT9709/A Package important to select peripherally appropriate capacitors. scenarios that can cause the input over shoot voltage. over shoot voltage range is 1.5 to 2 times the input voltage. θJAis the junction to ambient thermal resistance. ambient temperature on the maximum power allowed. components as close to the IC as possible. connected to ground plane of internal layer.

Figure 2. Recommended PCB Layout strong ground plane for heat sinking and noise prevention.

DS9709-02 April 2011 www.richtek.com Outline Dimension 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 0.180 0.300 0.007 0.012 D 2.950 3.050 0.116 0.120 D2 2.300 2.650 0.091 0.104 E 2.950 3.050 0.116 0.120 E2 1.500 1.750 0.059 0.069 e 0.500 0.020 L 0.350 0.450 0.014 0.018 W-Type 10L DFN 3x3 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

DS9709-02 April 2011www.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) 5F, No. 95, Minchiuan Road, Hsintien City Taipei County, Taiwan, R.O.C. Tel: (8862)86672399 Fax: (8862)86672377 Email: marketing@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. Symbol Dimensions In Millimeters Dimensions In Inches 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 0.180 0.300 0.007 0.012 D 3.950 4.050 0.156 0.159 D2 3.250 3.350 0.128 0.132 E 2.950 3.050 0.116 0.120 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 12L DFN 4x3 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