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IXD3220 Datasheet(PDF) 1 Page - Zilog, Inc. |
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IXD3220 Datasheet(HTML) 1 Page - Zilog, Inc. |
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1 / 18 page  Product Specification IXD3220/IXD3221 PS034101-0515 PRELIMINARY 1 16V Input Voltage Step-Down DC/DC Controller FEATURES Operating Input Voltage Range: 2.8V ~ 16.0V Output Voltage Range Externally Set: > 1.2V Output Current: up to 3A Reference Voltage: 0.9V ± 1.5% Oscillation Frequency: 300 kHz, 500 kHz and 1 MHz Operating Mode: PWM (IXD3220) or PWM/PFM automatically switching (IXD3221) Soft Start: 4 ms internal (IXD3220A/221A) or > 4 ms externally set (IXD3220B/221B) Protection: Integral and Short Circuit Small Package: SOT-25, USP-6C APPLICATION Set top boxes Digital TVs DVD/HDD recorders Various portable equipment DESCRIPTION The IXD3220/221 series are multi-purpose step-down DC/DC controllers, which require only a transistor, a coil, a diode, and two capacitors connected externally to create a high efficiency stable power supply with output current up to 3A. Low ESR ceramic capacitors can be used as an output capacitor. The IXD3220/221 series has a 0.9 V (±1.5 %) reference voltage, which allows set output voltage in wide range using external resistive divider. Switching frequency of 300 kHz, 500 kHz, and 1.0 MHz allows use of small external components. The IXD3220 series utilize PWM mode, while the IXD3221 series utilize either PWM or PFM mode, automatically switching from PWM to PFM at light loads to achieve high efficiency over a wide range of load conditions. The IXD3220/221series A and C versions have soft start function internally set to 4 ms, and the IXD3220/221 series B and D versions allow set-up soft start externally. The built-in UVLO (Under Voltage Lock Out) function forces the external P-channel transistor in OFF state when input voltage becomes 2.3V or lower. If the FB pin is shorted to the Ground or the output voltage drops rapidly because of overload, resulting in VFB < 0.7 V, the external P-channel transistor is forced OFF and latched in this state. The latching state does not mean a complete shutdown, but a state in which pulse output is suspended; but the internal circuitry remains in operation. To restart circuit, either VIN or CE pin should be triggered. Integral Protection Circuit monitors the duty cycle at EXT pin. In case of high load, when duty cycle ratio exceed maximum allowed value a certain amount of time (tPRO), the EXT pin latches at high level and keeps the external P-channel transistor in OFF state. To restart circuit, either VIN or CE pin should be triggered. For the applications with small dropout voltage, working close to maximum allowed duty cycle ratio, the IXD3220/221 series C or D versions without the integral protection are recommended. TYPICAL APPLICATION CIRCUIT TYPICAL PERFORMANCE CHARACTERISTIC Efficiency vs. Output Current IXD3221A095MR - VOUT = 3.3 V, fOSC = 500 kHz, CIN = CL = 47 µF (OS-Con), L = 10 µH (CDRH8D43, (SUMIDA), Q - CPH3308, CFB =1.0 µF (ceramic), RFB =10Ω RS requires with low ESR (ceramic) capacitors used as CL Neither tantalum or aluminum capacitors require RS |
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