VP3481MSG10

VP3481 High-Efficiency Boost/SEPIC DC/DC Controller Features General Description The VP3481 is a versatile controller designed for use in Boost, SEPIC and - VP3481MSG10-A in MSOP10 package is AECQ100 Qualified and Manufactured on an Au- power converter and to- tomotive Grade Flow pologies that needs an external low-side NMOSFET acting as primary switch. Besides cycle- - Wide Input Voltage from 2.97V to 40V by-cycle current limiting, current mode control - Reference Voltage with ± 3.0% Accuracy scheme also makes it wide bandwidth and good - Adjustable 100kHz~1MHz Clock Frequency transient response. The current limit can be pro- - 10μA Shutdown Current grammed simply with an external resistor. - 1A Peak Current Limit Using Internal Driver - Current Mode Operation The switching frequency can be set in any value - Internal 4/2Ω MOSFET Switch between 100kHz and 1MHz with a resistor or any - External RC Compensation external clock source. The VP3481 can be operat- - Internal Soft-Start ed at high switching frequency to save the solu- - High Efficiency at Light Loads tion board size. While entering shutdown mode, - Current Limit and Over Temperature Protection the VP3481 only sinks 5μA and it allows power supply sequencing. It has built-in protection cir- - Adjustable Input UVLO Threshold Voltage cuits such as thermal shutdown, under-voltage - MSOP-10 and TDFN3x3 Green Package with lockout, short circuit protection, and overvoltage protection. Internal soft-start circuitry reduces the inrush current at start-up. VP3481 is available in small MSOP-10 and DFN3X3-10 green package. Typical Application VP3481 Rev A.06 1 Applications - Portable Speakers - Offline Power Supply - Battery Powered Device - Set-Top Box - Photovoltaic Inverters http://www.viva-elec.com.tw VP3481 Functional Block Diagram Pin Assignments And Descriptions TDFN10 Top View MSOP-10 Top View ISEN UVLO COMP FB 1 2 3 4 10 9 8 7 IN VREG GATE PVSS AGND 5 6 FADJ ISEN UVLO COMP FB AGND 1 2 3 4 5 10 9 8 7 6 IN VREG GATE PVSS FADJ Pin No. Pin I/O/P Function Description 1 ISEN P Current Sense. Use an external resistor in series with ground to measure the voltage drop. 2 UVLO I 3 COMP I 4 FB I 5 AGND P Under Voltage Lockout. Use a proper ratio resistor divider network to determine the voltage input to allow switching and the hysteresis to disable switching. Compensation. Use a RC/C network to do proper loop compensation. Output Feedback. Connect the external resistor divider network from output to this pin to sense output voltage. The FB pin voltage is regulated to internal 1.275V reference voltage. Analog Ground. Connect to exposed pad. Frequency Adjust/Synchronization/Shutdown. A resistor connected from this pin to ground simply sets the oscillator frequency. An external clock signal at this pin will syn- 6 FADJ I 7 PVSS I Power Ground. Connect to exposed pad. 8 GATE O Gate Drive. Connect this terminal to the gate pin of the external MOSFET. 9 VREG O 10 IN I chronize the controller to the clock. Pull on this pin for ≥ 30 µs will turn the device off and the device will then very few current about 5µ A from the supply. VP3481 Rev A.06 Drive Supply Voltage. A bypass capacitor must be connected from this pin to ground. Do not bias this pin with external power source. Power Supply Input. 2 http://www.viva-elec.com.tw VP3481 Absolutely Maximum Ratings Over operating free-air temperature range, unless otherwise specified (* 1) Symbol Parameter Limit Unit VIN Supply voltage range -0.3 to 42 V Low voltage range -0.3 to 6 V VCC(VREG) Regulator output pin range -0.3 to 5 V VISEN Current sense pin range -0.4 to 0.6 TJMAX junction temperature MAX TSTG VLV (COMP/UVLO/FB/ FADJ/GATE) V 150 o C Storage temperature range -65 to 150 o C Electrostatic discharge Human body model 2 kV Electrostatic discharge Machine model 200 V ( *1): Stress beyond those listed at “absolute maximum rating” table may cause permanent damage to the device. These are stress rating ONLY. For functional operation are strongly recommend follow up “recommended operation conditions” table. Recommended Operating Conditions Symbol Parameter VIN Specification Unit Min Max Supply voltage 2.97 40 V fOSC Switching Frequency range 0.1 1 MHz TJ Operating Junction range -40 125 o C Thermal Information Thermal Metric Parameter θJC(top) Thermal resistance (Junction to Case (top) ) VP3481MSG10 LM3481DNG10 MSOP TDFN 46 54 o C/W Unit θJA Thermal resistance (Junction to Air) 147 49 o C/W θJB Thermal resistance (Junction to Board) 81 21 o C/W ψJT Junction-to-top characterization parameter 3 2 o C/W 77 21 o C/W ψJB Junction-to-board characterization parame- VP3481 Rev A.06 ter 3 http://www.viva-elec.com.tw VP3481 Electrical Characteristics VIN=12V, RFADJ=150kΩ, TJ=25℃, unless otherwise specified (* 1) Symbol Parameter Specification Test Condition Min VCOMP=1.4V, 3V