PDF MC34280 Data sheet ( Hoja de datos )

Número de pieza	MC34280
Descripción	Power Supply & Management IC for Handheld Electronic Products
Fabricantes	ON Semiconductor
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No Preview Available ! MC34280 PMEolaewncaetrgroeSnmuicpepPnltryoIdC&ufcotrsHandheld The MC34280 is a power supply integrated circuit which provides two boost regulated outputs and some power management supervisory functions. 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; or by a microprocessor, digitally through a 6–bit internal DAC. The MC34280 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 MC34280 is best suited to operate from 1 to 2 AA/ AAA cell. Moreover, supervisory functions such as low battery detection, CPU power–on reset, and back–up battery control, are also included in the chip. It makes the MC34280 the best one–chip power management solution for applications such as electronic organizers and PDAs. FEATURES: • Low Input Voltage, 1V up • Low Quiescent Current in Standby Mode: 35µA typical • PFM and Synchronous Rectification to ensure high efficiency (87% @200mA Load) • Adjustable Main Output: nominal 3.3V @ 200mA max, with 1.8V input • Auxiliary Output Voltage can be digitally controlled by microprocessor • Auxiliary Output Voltage: +5V @ 25mA max, with 1.8V input +25V @ 15mA max, with 1.8V input • Current Limit Protection • Power–ON Reset Signal with Programmable Delay • Battery Low Detection • Lithium Battery Back–up • 32–Pin LQFP Package http://onsemi.com 32–LEAD LQFP FTB SUFFIX CASE 873A MARKING DIAGRAM MC34280F TB AWLYYWW A = Assembly Location WL = Wafer Lot YY = Year WW = Work Week 32 1 PIN CONNECTIONS 32 1 VMAINFB VBAT ENABLE VDD PDELAY VREF AGND IREF MC34280 NC VAUXBASE VAUXCHG VAUXBDV VAUXFBN VAUXREF VAUXFBP VAUXEN APPLICATIONS: • Digital Organizer and Dictionary • Personal Digital Assistance (PDA) • Dual Output Power Supply (For MPU, Logic, Memory, LCD) • Handheld Battery Powered Device (1–2 AA/AAA cell) ORDERING INFORMATION Device Package Shipping MC34280FTB LQFP 250 Units/Tray MC34280FTBR2 LQFP 1800 Tape & Reel © Semiconductor Components Industries, LLC, 1999 February, 2000 – Rev. 2 1 Publication Order Number: MC34280/D 1 page MC34280 PIN FUNCTION DESCRIPTION Pin No. Function ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ1 VMAINFB ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ2 VBAT ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ3 ENABLE ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ4 VDD ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ5 PDELAY ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ6 VREF ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ7 AGND ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ8 IREF ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ9 LOWBATSEN ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ10 DGND ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ11 PORB ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ12 LOWBATB ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ13 LIBATON ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ14 LIBATCL ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ15 VAUXADJ ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ16 VAUXCON ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ17 VAUXEN ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ18 VAUXFBP ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ19 VAUXREF ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ20 VAUXFBN ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ21 VAUXBDV ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ22 VAUXCHG ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ23 VAUXBASE ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ24 NC ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ25 VAUXSW ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ26 VAUXEMR ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ27 LIBATIN ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ28 LIBATOUT ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ29 NC ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ30 VMAINGND ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ31 VMAINSW ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ32 VMAIN Type/Direction Analog / Input Power CMOS / Input Analog / Output Analog / Input Analog / Output Analog Ground Analog / Input Analog / Input Digital Ground CMOS / Output CMOS / Output CMOS / Input CMOS / Input CMOS / Input CMOS / Input CMOS / Input Analog / Input Analog / Output Analog / Input Power Analog / Output Analog / Output Analog / Output Analog / Output Analog / Input Analog / Output Power Ground Analog / Input Analog / Output Description Feedback pin for VMAIN Main battery supply Chip enable, Active high, ENABLE activates VMAIN after battery plug in, ENABLE is inactive after VMAIN is on Connect to decoupling capacitor for internal logic supply Capacitor connection for defining Power–On signal delay Bandgap Reference output voltage. Nominal voltage is 1.25V Resistor connection for defining internal current bias and PDELAY current Resistive network connection for defining low battery detect threshold Active LOW Power–On reset signal Active LOW low battery detect output microprocessor control signal for Lithium battery backup switch, the switch is ON when LIBATON=HIGH and LIBATCL=HIGH microprocessor control signal for Lithium battery backup switch, if it is HIGH, the switch is controlled by LIBATON, otherwise, controlled by internal logic microprocessor control signal for VAUX voltage control microprocessor control signal for VAUX voltage control VAUX enable, Active high Feedback pin for VAUX Reference Voltage for VAUX voltage level Feedback pin for VAUX VAUX BJT base drive circuit power supply test pin test pin no connection Collector output of the VAUX power BJT Emitter output of the VAUX power BJT Lithium battery input for backup purposes Lithium battery output no connection Ground for VMAIN low side switch VMAIN inductor connection VMAIN output http://onsemi.com 5 5 Page MC34280 DETAILED OPERATING DESCRIPTION (Cont’d) 2 x Iref CMAINb 100 pF RMAINb 1000 kOhm VBAT L1 33uH 1 VMAINFB x2 0.5 V Iref IREF 8 RIref 480 kOhm Voltage 1.22 V Reference VCOMP COMP1 AGND 31 VMAINSW ZLC COMP3 M2 +ve Edge Delay for Max. ON Time VDD senseFET RQ M1 S Qb DGND 1–SHOT for Min. OFF Time RQ S VDD ILIM DGND COMP2 VMAIN 32 + CMAIN 100 uF VMAINGND 30 Voltage Reference & Current Bias Main Regulator with Synchronous Rectifier AGND Figure 20. Simplified Block Diagram of Main Regulator In Figure 22, regulator is operating at Discontinuous Conduction Mode, waveforms are similar to those of Figure 21. However, coil current drops to zero before next switching cycle starts. To estimate conduction mode, below equation can be used. + Iroom h TON Vin2 2 L Vout ILOAD where, η is efficiency, refer to Figure 6 if Iroom > 0, the regulator is at Discontinuous Conduction mode if Iroom = 0, the regulator is at Critical Conduction mode where coil current just drops to zero and next cycle starts. if Iroom < 0, the regulator is at Continuous Conduction mode ǒ Ǔ+ TSW TON 1 h Vin Vout (S); ǒ Ǔ+ Ipk ILOAD 1 TON TSW ) Vin 2 TON L (A) For Discontinuous Conduction mode, provided that current limit is not reached, ǒ Ǔ+ @ @ @ @ @ TSW Vin TO2N 2 L ILOAD Vout h Vin 1 (S); + @Ipk Vin L TON (A) For Continuous Conduction mode, provided that current limit is not reached, http://onsemi.com 11 11 Page

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