SLM6240AB-13GTR

SLM6240 Sillumin Semiconductor Co., Ltd. Rev. 02 December 2015 24V 4A PWM STEP-UP DC-DC CONVERTER GENERAL DESCRIPTION FEATURES The SLM6240 devices are high-performance, fixed frequency, current-mode PWM step-up DC/DC converters that incorporate internal power MOSFETs. The SLM6240 includes an integrated 80-mΩ power switch that supports peak currents of up to 4A. The device is capable of providing an output voltage up to 24 V.     The SLM6240 uses peak current control topology to regulate the output voltage. In moderate to heavy load condition, the SLM6240 works in the pulse width modulation (PWM) mode. In light load condition, the device works in the pulse frequency modulation (PFM) mode to improve the efficiency. The SLM6240 utilizes simple external loop compensation allowing optimization between component size, cost and AC performance across a wide range of applications. Additional functions include an externally programmable soft-start function for easy inrush current control, internal overvoltage protection (OVP), cycle-by-cycle current limit protection, under voltage lock-out and thermal shutdown. The SLM6240 is available in the small SOIC8-EP package.           Input Voltage Range: 2.7 to 5.5V Adjustable Output Voltage Up to 24V 4A Switch Current Up to 85% Efficiency at VIN = 4.2V, VOUT = 12V, and IOUT = 0.7A Internal 24V 80-mΩ Power MOSFET 0.1µA Current into VIN Pin during Shutdown 800kHz Frequency Built-in Over-Voltage Protection (OVP) Open Protection Programmable Soft-Start Function Thermal Shutdowns Under-Voltage-Lockout Cycle-by-Cycle Overcurrent Protection SOIC8-EP Package APPLICATIONS      TM Battery-Powered Equipment (Bluetooth Speaker; E-Cigarette; Quick Charge Power Bank ) Portable POS Terminal TFT LCD Monitors Set-Top Boxes DSL and Cable Modems and Routers TYPICAL APPLICATION CIRCUIT Figure 1 Typical Application Circuit Copyright© 2015, Sillumin Semiconductor Co., Ltd. Rev 02, 12/02/2015 1 SLM6240 Sillumin Semiconductor Co., Ltd. Rev. 02 December 2015 PIN CONFIGURATION Package Pin Configuration (Top View) PGND 1 8 SW IN 2 7 SS EN 3 6 FB COMP 4 5 AGND SOIC8-EP PIN DESCRIPTION No. Pin Description 1 PGND Power Ground 2 IN Supply Input 3 EN Enable Control. Connect to a logic high level to enable the IC. Connect to a logic low level to disable the IC. When unused, connect EN pin to IN (do not leave pin floating). 4 COMP Error Amplifier Compensation Node 5 AGND Analog Ground 6 FB Feedback Input. Connect this pin a resistor divider from the output to set the output voltage. FB is regulated to 1.262V. 7 SS 8 SW - Exposed Pad Soft Start Control Input. Connect a capacitor from this pin to Ground to set soft-start timing duration. SS is discharged to ground in shutdown. SS may be left unconnected if soft start is not desired. Switch Output. Connect this pin to the inductor and the schottky diode. To minimize EMI, minimize the PCB trace path between this pin and the input bypass capacitor. Connected to Ground Copyright© 2015, Sillumin Semiconductor Co., Ltd. Rev 02, 12/02/2015 2 SLM6240 Sillumin Semiconductor Co., Ltd. Rev. 02 December 2015 ORDERING INFORMATION Industrial Range: -40°C to +125°C Order Part No. Package QTY SLM6240AB -13GTR SLM6240CB-13GTR SLM6240CB-GT SOIC8-EP 2500/Reel 2500/Reel 100/Tube FUNCTIONAL BLOCK DIAGRAM Copyright© 2015, Sillumin Semiconductor Co., Ltd. Rev 02, 12/02/2015 3 SLM6240 Sillumin Semiconductor Co., Ltd. Rev. 02 December 2015 ABSOLUTE MAXIMUM RATINGS SW to Ground VIN, EN, FB, SS, COMP to Ground Continuous SW Current Total power dissipation, PTOT Maximum junction temperature, TJMAX Storage temperature range, TSTG Operating temperature range, TA Junction to Ambient, Rth-JA Package Thermal Resistance Junction to Case, Rth-JC ESD (HBM) ESD (CDM) ESD (FICDM) Latch-up -0.3V ~ 28V -0.3V ~ 6.5V Internally Limited 1.5w (TS ≤100°C) 150°C -65°~+150°C -40°C~+125°C 60 °C/w 15 °C/w 2000 V 200 V 1500 V +/- 100mA Note: 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 condition 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. ELECTRICAL CHARACTERISTICS (TBD) Test condition is TA = −40°C ~ +125°C. Typical values are at TA = 25°C, unless otherwise specified. Symbol VIN Parameter Condition Input voltage operation range Under voltage lockout threshold Min. Typ. 2.7 VIN Rising Max. Unit 5.5 V 2.5 V 200 mV UVLO Under voltage lockout hysteresis IQ Chip quiescent current ISHDN Supply current in shutdown fREQ Switching frequency DC Maximum duty cycle VFB Feedback voltage IFB Feedback input current LNR VIN=3.6V, VFB=1.4V, Nonswitching VIN=3.6V, VFB=1.0V, Switching 5 0.1 1.0 1.23 VIN=3.6V, Duty cycle = 70% Switching ON resistance VIN=3.6V, VSW =12V, Duty ISW Switch leakage current VSW =12V, EN=GND ISS Soft start pin bias current VSS=1.2V VIH EN pin logic high VIL EN pin logic low REN EN pull down resistor TSD 3.5 cycle = 70% 2.0 uA kHz 90 Switching peak current limit TSD_HYS 3 800 VFB from 2.7V to 5.5V RDSON 0.35 mA EN=GND Feedback voltage line regulation ICL 0.30 % 1.26 1.29 V 0 80 nA 0.05 0.15 %/V 4.0 A 80 mΩ 4.5 15 uA 7.0 uA 1.4 V 0.4 V 1 MΩ Thermal shutdown temperature 150 °C Thermal shutdown hysteresis 15 °C Copyright© 2015, Sillumin Semiconductor Co., Ltd. Rev 02, 12/02/2015 4 SLM6240 Sillumin Semiconductor Co., Ltd. Rev. 02 December 2015 APPLICATION INFORMATION The SLM6240 are highly efficient step-up DC/DC converters that employ a current mode, fixed frequency pulse-width modulation (PWM) architecture with excellent line and load regulation. The SLM6240 operate at constant switching frequency under medium to high load current conditions. At light loads, these devices operate in a pulse-skipping mode in order to improve light-load efficiency. Soft-Start The SLM6240 both offer a programmable soft-start function which minimizes inrush current during startup. The soft-start period is programmed by connecting a 10nF capacitor between SS and Ground. Operation of the soft-start function is as follows: when the IC is disabled, SS is actively discharged to Ground. Upon enabling the IC, CSS is charged with a 4.5μA current so that the voltage at SS increases in a controlled manner. The peak inductor current is limited by the voltage at SS, so that the input current is limited until the soft-start period expires, and the regulator can achieve its full output current rating. Setting the Output Voltage The both feature external adjustable output voltages of up to 24V. To program the output voltage, simply connect a resistive voltage divider between the output, FB, and GND, with resistors set according to the following equation:  V R1  R2   OUT  VFB     1   where VFB=1.26V overcurrent event, the output voltage begins to droop as a function of the load on the output. VOUT I   VIN   I CL  RIPPLE    2    I OUT where  VOUT is the output voltage of the boost regulator.  IOUT is the output current of the boost regulator.  VIN is the input voltage of the boost regulator.  ICL is the input switching peak current limit of the boost regulator.  IRIPPLE is the inductor ripple current of the boost regulator.  η is the power conversion efficiency. Open Circuit Protection Once the outputs achieve regulation, if the voltage at FB falls below 0.2V the controller will automatically disable, preventing the controller from running openloop and potentially damaging the IC and load. Shutdown Drive EN low to disable the IC and reduce the supply current to just 0.1μA. As with all non-synchronous step-up DC/DC converters, the external Schottky diode provides a DC path from the input to the output in shutdown. As a result, the output drops to one diode voltage drop below the input in shutdown. The SLM6240 both feature integrated thermal overload protection. Both devices are automatically disabled when their junction temperatures exceed +150°C, and automatically re-enable when the die temperature decreases by 15°C. Rectifier Selection For optimal performance, the rectifier should be a Schottky rectifier that is rated to handle both the output voltage as well as the peak switch current. Open Voltage Protection The features internal automatic over-voltage protection, when feedback voltage is higher than 115%. Overcurrent Protection The SLM6240 has a cycle-by-cycle overcurrent limit protection that turns off the power switch once the inductor current reaches the overcurrent limit threshold. The PWM circuitry resets itself at the beginning of the next switch cycle. During an Copyright© 2015, Sillumin Semiconductor Co., Ltd. Rev 02, 12/02/2015 5 SLM6240 Sillumin Semiconductor Co., Ltd. Rev. 02 December 2015 TYPICAL OPERATING CHARACTERISTICS Test condition is TA = 25°C, VIN = VEN = 5.0V, VFREQ = 0V, unless otherwise specified. Copyright© 2015, Sillumin Semiconductor Co., Ltd. Rev 02, 12/02/2015 6 SLM6240 Sillumin Semiconductor Co., Ltd. Rev. 02 December 2015 PACKAGE INFORMATION SOIC8-EP Note: All dimensions in millimeters unless otherwise stated. Copyright© 2015, Sillumin Semiconductor Co., Ltd. Rev 02, 12/02/2015 7 SLM6240 Sillumin Semiconductor Co., Ltd. Rev. 02 December 2015 IMPORTANT NOTICE Sillumin Semiconductor Co., Ltd. and its subsidiaries (SILLUMIN) reserve the right to make corrections, enhancements, improvements and other changes to its semiconductor products and services per JESD46, latest issue, and to discontinue any product or service per JESD48, latest issue. Buyers should obtain the latest relevant information before placing orders and should verify that such information is current and complete. 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