LV5762LF

Ordering number : ENA1768 Bi-CMOS IC LV5762LF Overview Functions Step-down Switching Regulator LV5762LF is a 1ch step-down voltage switching regulator. • Load-independent soft start circuit • 1ch step-down switching regulator controller • Frequency fold back function • ON/OFF function • Built-in pulse-by-pulse OCP circuit. It is detected by using ON resistance of an external MOS. Specifications Parameter Supply voltage Maximum Ratings at Ta = 25°C Symbol VIN max Pd max Topr Tstg *) Conditions Ratings 45 0.65 -40 to 85 -55 to 150 Unit V W °C °C Allowable power dissipation Operating temperature Storage temperature * Specified board: 24.0mm × 15.0mm ×1.6mm, glass epoxy board (2-layer). Recommended Operating Conditions at Ta = 25°C Parameter Supply voltage range 1 Error amplifier input coltage Symbol VIN VFB Conditions Ratings 8 to 42 0 to 1.6 Unit V V Electrical Characteristics at Ta = 25°C, VIN = 12V Parameter Reference voltage block Internal reference voltage 5V power supply Vref VDD Including offset of E/A IOUT=0 to 5mA 0.695 4.7 0.705 5.2 0.715 5.7 V V Symbol Conditions Ratings min typ max Unit Continued on next page. Any and all SANYO Semiconductor Co.,Ltd. products described or contained herein are, with regard to "standard application", intended for the use as general electronics equipment (home appliances, AV equipment, communication device, office equipment, industrial equipment etc.). The products mentioned herein shall not be intended for use for any "special application" (medical equipment whose purpose is to sustain life, aerospace instrument, nuclear control device, burning appliances, transportation machine, traffic signal system, safety equipment etc.) that shall require extremely high level of reliability and can directly threaten human lives in case of failure or malfunction of the product or may cause harm to human bodies, nor shall they grant any guarantee thereof. If you should intend to use our products for applications outside the standard applications of our customer who is considering such use and/or outside the scope of our intended standard applications, please consult with us prior to the intended use. If there is no consultation or inquiry before the intended use, our customer shall be solely responsible for the use. Specifications of any and all SANYO Semiconductor Co.,Ltd. products described or contained herein stipulate the performance, characteristics, and functions of the described products in the independent state, and are not guarantees of the performance, characteristics, and functions of the described products as mounted in the customer' s products or equipment. To verify symptoms and states that cannot be evaluated in an independent device, the customer should always evaluate and test devices mounted in the customer' s products or equipment. 60910 SY 20100524-S00001 No.A1768-1/5 LV5762LF Continued from preceding page. Parameter Triangular waveform oscillator block Oscillation frequency Frequency variation Oscillatory frequency fold back detection voltage Symbol Conditions Ratings min typ max Unit fOSC fOSC_DV VOSC_FB fOSC_FB VEN_on VEN_off ISS_SC ISS_SK VSS_END VUVLO VUVLO_H IEA_IN GEA VEA_R IEA_OSK IEA_OSC GISNS VIN=8 to 42V FB=1.0V FB=0V VIN=8 to 42V VIN=8 to 42V EN › 5V, SS=0V EN › 1V, VDD=5V, SS=1V VIN=8 to 42V Detect IN voltage after the end of SS 870 1000 1 0.5 1130 kHz % V Oscillatory frequency after fold back ON/OFF circuit block IC start-up voltage IC off voltage Soft start circuit block Soft start source current Soft start sink current Voltage to end the soft start function UVLO circuit block UVLO lock release voltage UVLO hysteresis Error amplifier Input bias current Error amplifier transconductance Common mode input voltage range Sink output current Source output current Current detection amplifier gain Over current limiter circuit block Reference current Over current detection comparator offset voltage 100 150 200 kHz 3.4 1.1 1.3 4.3 V V 3.4 4.3 2 5.2 μA mA 0.7 0.9 1.1 V 7.0 7.4 0.6 7.8 V V 100 1000 0.0 -100 100 1.3 1400 1800 1.6 μA μA/V V μA μA ILIM VLIM_OFS -10% -5 VIN-0.45 20 +10% +5 VIN μA mV V Over current detection comparator common mode input range PWM comparator Input threshold voltage Vtmax Vt0 Maximum ON duty Output block Output stage ON resistance(the upper side) Output stage ON resistance(the under side) Output stage ON current(the upper side) Output stage ON current(the under side) Duty cycle=DMAX Duty cycle=0% 0.95 0.35 75 1.1 0.45 80 1.25 0.55 V V % DMAX RONH RONL IONH IONL ICCS ICCA EN ‹ 1V EN › 5V 240 240 5 5 Ω Ω mA mA The whole device Standby current Mean consumption current 60 3.6 μA mA No.A1768-2/5 LV5762LF Pin Assignment SS/ HICCUP 16 COMP 1 EN 2 SW 3 CBOOT 4 5 HDRV 15 NC FB NC 14 13 12 11 VIN 10 GND 9 VDD LV5762LF 6 NC 7 NC 8 LDRV Top view Pin Function Pin No. 1 2 3 4 5 6, 7 14, 15 8 9 10 11 LDRV VDD GND VIN An external the lower MOSFET gate drive pin. Power supply pin for an external the MOS-FET gate drive. Ground pin. Each reference voltage is based on the voltage of the ground pin. Power supply pin. This pin is monitored by UVLO function. When the voltage of this pin becomes 7.8V or more by UVLO function, The IC starts and the soft start function operates. 12 ILIM Reference current pin for current detection. The sink current of about 20μA flows to this pin. When a resistance is connected between this pin and VIN outside and the voltage applied to the SW pin is lower than the voltage of the terminal side of the resistance, the upper Nch MOSFET is off by operating the current limiter comparator. This operation is reset with respect to each PWN pulse. 13 SS/HICCUP Pin to connect a capacitor for soft start. A capacitor for soft start is charged by using the voltage of about 4.3μA. This pin ends the soft start period by using the voltage of about 0.9V and the frequency fold back function becomes active. 16 FB Error amplifier reverse input pin. By operating the converter, the voltage of this pin becomes 0.7V. The voltage in which the output voltage is divided by an external resistance is applied to this pin. Also, the oscillation frequency become one-eighth when the voltage of this pin becomes 0.4V or less after soft start function. Pin name COMP EN SW CBOOT HDRV NC Error amplifier output pin. Connect a phase compensation circuit between this pin and GND. ON/OFF pin. Pin to connect with switching node. The source of Nch MOSFET connects to this pin. Bootstrap capacity connection pin. This pin becomes a GATE drive power supply of an external Nch MOSFET. Connect a bypath capacitor between CBOOT and SW. An external the upper MOSFET gate drive pin. No connection Function No.A1768-3/5 LV5762LF Package Dimensions unit : mm (typ) 3394 TOP VIEW 3.0 SIDE VIEW BOTTOM VIEW Exposed Die-Pad Do Not Connect 1.0 Pd max -- Ta Mounted on a specified board: 24.0×15.0×1.6mm3 2 laery glass epoxy board (2-layer) Allowable power dissipation, Pd max -- W 0.8 (1.5) 3.0 0.4 (1.5) 0.65 0.6 16 21 0.5 0.25 12 0.4 0.34 0.2 (0.75) SIDE VIEW (0.8) 0.85 MAX 0 -40 -20 0 20 40 60 80 100 0.0 NOM Ambient temperature, Ta -- C SANYO : VQFN16(3.0X3.0) Block Diagram VIN 5V REGULATOR REFERENCE VOLTAGE TSD UVLO ILIM S Q + OCP Comp VIN + R + 1.3V Current Amp + HICCUP Comp CBOOT HDRV S R SAW WAVE OSCILLATOR D-max=90% 1.1V OCP 0.9V SD - SS Comp SD Q SW 0.45V SS/ HICCUP FB COMP 0.7V + + - + + CONTROL Logic VDD LDRV GND Shutdown(SD) HICCUP Comp fOSC forced 1/8 0.5V + EN No.A1768-4/5 LV5762LF Sample Application Circuit VIN=8V to 42V C7 R5 C6 C1 VIN ILIM CBOOT C2 Q1 L ON/OFF EN LV5762LF SS/HICCUP C5 R1 R2 C3 C31 HDRV SW Q2 OUT R4 D1 C4 LDRV FB C9 D2 C8 R3 C10 COMP GND VDD GND SANYO Semiconductor Co.,Ltd. assumes no responsibility for equipment failures that result from using products at values that exceed, even momentarily, rated values (such as maximum ratings, operating condition ranges, or other parameters) listed in products specifications of any and all SANYO Semiconductor Co.,Ltd. products described or contained herein. SANYO Semiconductor Co.,Ltd. strives to supply high-quality high-reliability products, however, any and all semiconductor products fail or malfunction with some probability. It is possible that these probabilistic failures or malfunction could give rise to accidents or events that could endanger human lives, trouble that could give rise to smoke or fire, or accidents that could cause damage to other property. When designing equipment, adopt safety measures so that these kinds of accidents or events cannot occur. Such measures include but are not limited to protective circuits and error prevention circuits for safe design, redundant design, and structural design. In the event that any or all SANYO Semiconductor Co.,Ltd. products described or contained herein are controlled under any of applicable local export control laws and regulations, such products may require the export license from the authorities concerned in accordance with the above law. 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SANYO Semiconductor Co.,Ltd. shall not be liable for any claim or suits with regard to a third party's intellctual property rights which has resulted from the use of the technical information and products mentioned above. This catalog provides information as of June, 2010. Specifications and information herein are subject to change without notice. PS No.A1768-5/5