Details, datasheet, quote on part number: FAN1112D
Description1A 1.2V Low Dropout Linear Regulator
CompanyFairchild Semiconductor
DatasheetDownload FAN1112D datasheet
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Features, Applications


Low dropout voltage Load regulation: 0.05% typical Trimmed current limit On-chip thermal limiting Standard SOT-223 and TO-252 packages Three-terminal fixed 1.2V


The a 1.2V low dropout three-terminal regulator with 1A output current capability. The device has been optimized for low voltage where transient response and minimum input voltage are critical. Current limit is trimmed to ensure specified output current and controlled short-circuit current. On-chip thermal limiting provides protection against any combination of overload and ambient temperatures that would create excessive junction temperatures. Unlike PNP type regulators where 10% of the output current is wasted as quiescent current, the quiescent current of the FAN1112 flows into the load, increasing efficiency. The FAN1112 regulator is available in the industry-standard SOT-223 and TO-252 (DPAK) power packages.

Post regulator for switching supplies Supply for low-voltage processors
Front View Tab is VOUT Front View 3 Tab is VOUT 1 IN OUT GND OUT 4-Lead Plastic 2 3

*With package soldered to 0.5 square inch copper area over backside ground plane or internal power plane., JA can vary from 30C/W to more than 50C/W. Other mounting techniques may provide better thermal resistance than 30C/W.

Parameter VIN (VIN VOUT) * IOUT Operating Junction Temperature Range Storage Temperature Range Lead Temperature (Soldering, 10 sec.) 0 -65 Min. Max. 18 See Figure C Unit V

Figure 1. Absolute Maximum Safe Operating Area

Operating Conditions: VIN = 25C unless otherwise specified. The denotes specifications which apply over the specified operating temperature range. Parameter Output Line Voltage3 Conditions 10mA IOUT FAN1112, 3.0V VIN 7.2V 3.0V VIN 12V, IOUT = 10mA (VIN VOUT) 2V, 10mA IOUT 1A VREF = 1%, IOUT = 1A (VIN VOUT) 2V 3.0V VIN 7V, 10mA IOUT 1A 3.0V VIN 15V VIN = 120Hz, COUT = 22F Tantalum, (VIN VOUT) = 3V, IOUT 25C, 30ms pulse f 10kHz Min. 1.140 Typ. Max. Units mA dB %/W % C/W C

Dropout Voltage Current Limit GND Pin Current GND Pin Current Change Minimum Load Current Quiescent Current Ripple Rejection Thermal Regulation Temperature Stability Long-Term Stability RMS Output Noise of VOUT)

Thermal Resistance, Junction SOT-223 to Case TO-252 Thermal Shutdown Thermal Shutdown Hysteresis Junction Temperature

Notes: 1. See thermal regulation specifications for changes in output voltage due to heating effects. Load and line regulation are measured at a constant junction temperature by low duty cycle pulse testing. 2. Line and load regulation are guaranteed up to the maximum power dissipation (18W). Power dissipation is determined by input/output differential and the output current. Guaranteed maximum output power will not be available over the full input/ output voltage range. 3. Output current must be limited to meet the absolute maximum ratings of the part.


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