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| 2.5V to 12V Output MD1322F DESCRIPTION Company Name 28 TAB2 15 Type No. The MD1322F is a high-efficiency step down DC-DC converter power integrated circuit with main MOSFET switch and Schottky Barrier Diode. The MD1322F can deliver 7.5 watts maximum (5V, 3.0A) with high efficiency over a wide input voltage range. This device has output voltage digitally selectable from 2.5V to 12V. With the MD1322F you can construct a complete DC-DC converter using only a few external components. Featuring an HSOP 28-pin SHINDENGEN MD1322F 5030N 1 TAB1 14 - 12.23 + 0.3 - 8.8 + 0.1 Lot No. surface mount package, the MD1322F allows you to incorporate a very small and thin power supply on your circuit board. BLOCK DIAGRAM Vref 26 FEATURES Vboot 6 Vcc 5 VB 23 VG 22 VDD TAB2 s High efficiency s Wide input voltage load range 8VDC to 30VDC Up to 3ADC s Output voltage selectable function START UP START=7.2V STOP=6.7V BOOT Reference Vref=6.5V Driver Vref=Vout+5.8V Reference Vref=5V5% TSD 100C 150C Main Switch MOS OFF driver 2.5V to 12V s Internal Switching power device TAB1 Error amp + 2.45V PWM comp + VOUT Main MOSFET for switch SBD for rectification s Fixed 250kHz PWM frequency Without external resistor and capacitor s Overcurrent protection Q 3V 1V OSC f=250kHz CLM Vth= 0.1~0.2V R S + - 28 27 1 2 3 4.24 8-11 amp- ampOUT S/S OCL- OCL+ GND P.GND s Thermal shutdown function PIN ASSIGNMENT Pin# 1 2 3 4 VOUT:TAB1 TAB2:VDD S/S: 1 OCL-: 2 OCL+: 3 GND: 4 Vcc: 5 Vboot: 6 N/C: 7 28: amp27: ampOUT 26: Vref: 25: VTS 24: GND 23: VB 22: VG Symbol S/S OCLOCL+ GND Vcc Vboot N/C P.GND N/C VG VB GND VTS Vref AmpOUT ampVOUT VDD Function description Capacitor for softstart Overcurrent protection (OCL) (-) Overcurrent protection (OCL) (+) Signal GND Input voltage High side drive supply for main MOS Non-connection Power GND Non-connection Gate terminal of main MOS Bootstrap capacitor between VB and VOUT Signal GND Output voltage selectable terminal Internal voltage reference Error Amp out Error Amp (-) input Power stage output Drain of main MOS Switch 5 6 7 8 ~ 11 12 ~ 21 22 23 24 25 26 27 28 TAB1 TAB2 P.GND: 8 P.GND: 9 P.GND: 10 P.GND: 11 N/C: 12 N/C: 13 N/C: 14 21: N/C 20: N/C 19: N/C 18: N/C 17: N/C 16: N/C 15: N/C s Vref - Temperature compensated internal voltage. You can pull 1mA maximum for external circuit. s OSC - Uses internal oscillator without external component. Frequency (Saw tooth wave form) is trimmed to 250kHz on chip. s Error Amp - Error Amp detects output voltage of DC-DC converter and controls PWM signal. You can adjust the loop gain when you connect feedback resistor and capacitor between AmpOUT and Amp (-). It will provide stable phase compensation. s Overcurrent protection - Uses pulse-by-pulse current protection. Current will be sensed voltage drop of external current sensing resistor. Threshold of OCL is 0.19V. 1-800-634-3654 2.5V-12V Output MD1322F ABSOLUTE MAXIMUM RATINGS Parameter Line voltage Output MOS input voltage Output current (AVE) Output Current (PEAK) OCL-,OCL+terminal voltage Storage temperature Junction temperature Symbol VIN VDD IOUTave IOUTpeak VOCL Tstg Tj Rating 32 32 3 4 5.5 -40 ~ 150 150 (Ta=25C) Units V V A A V C C Output setting voltage 2.5V ~5.3V < = 6V < = 8V < 12V = Output current 3A 2.5V 2A 1.5A RECOMMENDED OPERATION CONDITIONS Parameter Input voltage Output voltage setting range Operation temperature Recommendation 8 ~ 30 2.5 ~ 12 -10 ~ 80 Units V V C OUTPUT CURRENT DERATING FOR 5.3V OR HIGHER OUTPUT ELECTRICAL CHARACTERISTICS Parameter High side MOS D - S voltage High side MOS Drain interruption current High side MOS Drain-source ON resistance High side MOS Source-drain Di forward voltage Low side SBD Peak reverse voltage Low side SBD Forward voltage Low side SBD Reverse current Start voltage Stop voltage Stop-start voltage hysteresis Current consumption BOOT terminal voltage Internal reference voltage Initial oscillation frequency Overcurrent threshold voltage Softstart terminal current Error amplifier reference voltage Overcurrent protection operating temperature Symbol Conditions ID=1mA, VGS=0V VDS=30V, VGS=0V MIN TYP MAX 10 250 1.5 0.55 2 7.9 7.4 10 7.6 5.25 287.5 0.218 -5 2.5 - (Ta=25C) Units Vdss Idss Ron VSD VRM VF IR Vcc_start Vcc_stop Vcc_hys Icc Vboot Vref fosc Vth_OCL IS/S Vamp T_TSD 32 40 6.5 6.0 5.4 4.75 212.5 0.162 -20 2.4 - 140 7.2 6.7 0.5 8 6.5 5 250 0.19 -12.5 2.45 150 V uA m V V V mA V V V mA V V kHz V uA V C ID=1.2A, VGS=4V IS=1.2A, VDS=0V IF=1.2A VR=VRM Vcc=8V ~ 30V Vcc=8V ~ 30V Vcc=8V ~ 30V Vcc=24V Vcc=24V Vcc=24V Vcc=8V ~30V - 1-800-634-3654 |
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