PDF MC33680 Data sheet ( Hoja de datos )

Número de pieza	MC33680
Descripción	Dual DC-DC Regulator
Fabricantes	ON Semiconductor
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No Preview Available ! MC33680 Dual DC−DC Regulator for Electronic Organizer The MC33680 is a dual DC−DC regulator designed for electronic organizer applications. Both regulators apply Pulse−Frequency−Modulation (PFM). The main step−up regulator output can be externally adjusted from 2.7V to 5V. An internal synchronous rectifier is used to ensure high efficiency (achieve 87%). The auxiliary regulator with a built−in power transistor can be configured to produce a wide range of positive voltage (can be used for LCD contrast voltage). This voltage can be adjusted from +5V to +25V by an external potentiometer. The MC33680 has been designed for battery powered hand−held products. With the low start−up voltage from 1V and the low quiescent current (typical 35 μA); the MC33680 is best suited to operate from 1 to 2 AA/ AAA cell. Moreover, supervisory functions such as low battery detection, CPU Power−Good signal, and back−up battery control, for lithium battery or supercap are also included in the chip. FEATURES: • Low Input Voltage, 1V up • Low Quiescent Current in Standby Mode: 35μA typical • PFM and Synchronous Rectification to ensure high efficiency (87% @60mA Load) • Adjustable Main Output: +2.7V to +5V www.DataSheet4U.com nominal 3.3V @ 100mA max, with 1.8V input • Auxiliary Output Voltage: +5V to +25V +5V @ 25mA max, with 1.8V input +25V @ 15mA max, with 1.8V input • Current Limit Protection • Power−Good Signal with Programmable Delay • Battery Low Detection • Lithium Battery or Supercap Back−up • 32−Pin LQFP Package APPLICATIONS: • Digital Organizer and Dictionary • Dual Output Power Supply (For MPU, Logic, Memory, LCD) • Handheld Battery Powered Device (1−2 AA/AAA cell) http://onsemi.com 32 1 32−LEAD LQFP FTB SUFFIX CASE 873A PIN CONNECTIONS & DEVICE MARKING VAUXSW VAUXEMR LIBATIN LIBATOUT NC VMAINGND VMAINSW VMAIN MC33680 FTB AWLYYWW NC DGND LIBATCL LIBATON LOWBATB PORB DGND LOWBATSEN (Top View) ORDERING INFORMATION Device Package Shipping MC33680FTB LQFP 1250 Tray / Drypack MC33680FTBR2 LQFP 1800 / Tape & Reel © Semiconductor Components Industries, LLC, 2006 July, 2006 − Rev. 4 1 Publication Order Number: MC33680/D 1 page MC33680 ABSOLUTE MAXIMUM RATINGS (TA = 25°C, unless otherwise noted.) Parameter ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁPower Supply Voltage ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁDigital Pin Voltage Symbol VBAT Vdigital Min Max Unit −0.3 7.0 Vdc −0.3 7.0 Vdc General Analog Pin Voltage Vanalog −0.3 7.0 Vdc Pin VAUXSW to Pin VAUXEMR Voltage (Continuous) ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁPin VMAINSW to Pin VMAIN Voltage (Continuous) VAUXCE Vsyn −0.3 30 0.3 ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁOperating Junction Temperature Tj (max) 150 ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁAmbient Operating Temperature Ta 0 70 ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁStorage Temperature Tstg − 50 150 ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁSTATIC ELECTRICAL CHARACTERISTICS (Circuit of Figure 1, VP = 1.8V, Iload = 0 mA, TA = 0 to 70°C unless Vdc Vdc °C °C °C otherwise noted.) Rating Symbol Min Typ Max Unit Operating Supply Voltage1 VBAT 1.0 V VMAIN output voltage VMAIN output voltage range2 VMAIN output current3 VMAIN maximum switching frequency4 Vmain Vmain_range I3.3_1.8 Freqmax_VM 3.1 3.3 3.5 V 2.7 5.0 V 200 mA 100 kHz VMAIN peak coil static current limit ILIM_VM 0.85 1.0 1.15 A VAUX output voltage range VAUX_range 5.0 25 V VAUX maximum switching frequency VAUX peak coil static current limit Quiescent Supply Current at Standby Mode5 Freqmax_VL ILIM_VL Iqstandby 120 kHz 1.0 A 35 60 μA Reference Voltage @ no load Battery Low Detect lower hysteresis threshold6 Vrefno_load VLOBAT_L 1.16 1.22 1.28 0.8 0.85 0.9 V V Battery Low Detect upper hysteresis threshold PDELAY Pin output charging current VLOBAT_H IchgPDELAY 1.05 1.1 1.15 V 0.8 1.0 1.2 μA PDELAY Pin voltage threshold VthPDELAY 1.16 1.22 1.28 V NOTE: 1. Output current capability is reduced with supply voltage due to decreased energy transfer. The supply voltage must not be higher than VMAIN+0.6V to ensure boost operation. Max Start−up loading is typically 1V at 400 μA, 1.8V at 4.4 mA, and 2.2V at 88 mA. NOTE: 2. Output voltage can be adjusted by external resistor to the VMAINFB pin. NOTE: 3. At VBAT = 1.8V, output current capability increases with VBAT. NOTE: 4. Only when current limit is not reached. NOTE: 5. This is average current consumed by the IC from VDD, which is low−pass filtered from VMAIN, when only VMAIN is enabled and at no loading. NOTE: 6. This is the minimum of ”LOWBATB” threshold for battery voltage, the threshold can be increased by external resistor divider from ”VBAT” to ”LOWBATSEN”. http://onsemi.com 5 5 Page MC33680 VREF Feedback Voltage tdl M1 ON M2 OFF Ipk tdh Cycle Starts M1 OFF M2 ON M1 ON M2 OFF TON Loading Current, ILOAD Coil Current VMAIN VMAIN + 1 V TSW M1 OFF M2 ON M1 ON M2 OFF M1 OFF M2 ON V@SW VMAIN Zoom−In 0V Feedback Voltage VREF tdl Figure 19. Waveforms of Continuous Conduction Mode Cycle Starts M1 ON M2 OFF M1 OFF tdh M1 ON M2 OFF M1 OFF M1 ON M2 OFF Ipk TON Loading Current, ILOAD Coil Current VMAIN + 1 V VMAIN V@SW VIN 0V TSW VMAIN Zoom−In Figure 20. Waveforms of Discontinuous Conduction Mode http://onsemi.com 11 M1 OFF 11 Page

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