FAN1112SX FAIRCHILD | Alldatasheet
Document overview
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- PDF pages: 8
Technical content
Features
- 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
Applications
- Post regulator for switching supplies
- Supply for low-voltage processors
Description
The FAN1112 is 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 up to 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. Typical Application VIN = 3.3V V IN VOUT GND 1.2V at 1A FAN1112 10µF 22µF FAN1112 1A 1.2V Low Dropout Linear Regulator
30°C/W to more than 50°C/W. Other mounting techniques may provide better thermal resistance than 30°C/W. Figure 1. Absolute Maximum Safe Operating Area
FAN1112 PRODUCT SPECIFICATION REV. 1.0.1 9/27/01
Electrical Characteristics
Operating Conditions: V IN 7V, T J = 25°C unless otherwise specified. The denotes specifications which apply over the specified operating temperature range. 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. Parameter Conditions Min. Typ. Max. Units Output Voltage 10mA I OUT FAN1112, 3.0V V IN 7.2V 1.140 1.200 1.260 V Line Regulation 1,2 3.0V V IN 12V, I OUT = 10mA 0.005 0.2 % Load Regulation 1,2 IN – V OUT ) = 2V, 10mA I OUT 0.05 0.5 % Dropout Voltage V REF = 1%, I OUT = 1A 1.100 1.200 V Current Limit (V IN – V OUT ) = 2V 1.1 1.5 A GND Pin Current 35 120 µ A GND Pin Current Change 3.0V V IN 7V, 10mA I OUT 0.2 5 µ A Minimum Load Current 3.0V V IN 15V 10 mA Quiescent Current V IN = 7V 41 3 m A Ripple Rejection f = 120Hz, C OUT = 22 µ F Tantalum, IN – V OUT ) = 3V, I OUT = 1A 60 72 dB Thermal Regulation T A = 25 C, 30ms pulse 0.004 0.02 %/W Temperature Stability 0.5 % Long-Term Stability T A = 125 C, 1000hrs. 0.03 1.0 % RMS Output Noise (% of V OUT T A = 25 C, 10Hz f 10kHz 0.003 % Thermal Resistance, Junction to Case SOT-223 15 C/W TO-252 3 C/W Thermal Shutdown Junction Temperature 155 C Thermal Shutdown Hysteresis C
0 MINIMUM LOAD CURRENT (mA)
Figure 2. Dropout Voltage vs. Output Current Figure 3. Load Regulation vs. Temperature Figure 4. Reference Voltage vs. Temperature Figure 5. Minimum Load Current vs. Temperature Figure 6. GND Pin Current vs. Temperature Figure 7. Short-Circuit Current vs. Temperature
Figure 8. Ripple Rejection vs. Frequency Figure 9. Maximum Power Dissipation
PRODUCT SPECIFICATION FAN1112 REV. 1.0.1 9/27/01 Mechanical Dimensions 4-Lead SOT-223 Package A — .071 Symbol Inches Min. Max. Min. Max. Millimeters Notes A1 — .181 .033B .025 c — .090 E .130 .148 e H .264 .287 .115 .124 .033 .041 — 10° F F I J D .248 .264 — 1.80 — 4.80 .840.640 — 2.29 3.30 3.71 6.71 7.29 .012 — .310 — 2.95 3.15 .840 1.04 — 10° 10° 16°K 10° 16° .0008 .0040L .0203 .1018 10° 16°M 10° 16° .010 .014N .250 .360 6.30 6.71 A D e E c H B I J K L M N
FAN1112 PRODUCT SPECIFICATION REV. 1.0.1 9/27/01 Mechanical Dimensions (continued) 3-Lead TO-252 Package A .086 .094 2.19 2.39 Symbol Inches Min. Max. Min. Max. Millimeters Notes b .025 .035 0.64 0.89 .045 1.14b2 .030 0.76 c .018 .024 0.46 0.61 c2 .018 .023 0.46 0.58 D .210 .245 5.33 6.22 1 E .250 .265 6.35 6.73 .090 BSC 2.29 BSC .108 REF 2.74 REF .370 .410 9.40 10.41 e H L .055 .070 1.40 1.78 .035 .080 0.89 2.03 .025 .040 0.64 1.02 .215 5.46b3 .205 5.21 E @PKG/ @HEATSINK D A -C- H L -A- α = 0° – 10° -B- E-PIN b2 L4 b e Notes: Dimensions are exclusive of mold flash, metal burrs or interlead protrusion. Stand off-height is measured from lead tip with ref. to Datum -B-. Foot length is measured with ref. to Datum -A- with lead surface. Thermal pad contour optional within dimension b3 and L3. Formed leads to be planar with respect to one another at seating place -C-. Dimensions and tolerances per ASME Y14.5M-1994.
PRODUCT SPECIFICATION FAN1112 LIFE SUPPORT POLICY FAIRCHILD ’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT OF FAIRCHILD SEMICONDUCTOR CORPORATION. As used herein: 1. Life support devices or systems are devices or systems which, (a) are intended for surgical implant into the body, or (b) support or sustain life, and (c) whose failure to perform when properly used in accordance with instructions for use provided in the labeling, can be reasonably expected to result in a significant injury of the user. 2. A critical component in any component of a life support device or system whose failure to perform can be reasonably expected to cause the failure of the life support device or system, or to affect its safety or effectiveness. www.fairchildsemi.com 9/27/01 0.0m 007 Stock#DS30001112
2001 Fairchild Semiconductor Corporation
FAIRCHILD SEMICONDUCTOR RESERVES THE RIGHT TO MAKE CHANGES WITHOUT FURTHER NOTICE TO ANY PRODUCTS HEREIN TO IMPROVE RELIABILITY, FUNCTION OR DESIGN. FAIRCHILD DOES NOT ASSUME ANY LIABILITY ARISING OUT OF THE APPLICATION OR USE OF ANY PRODUCT OR CIRCUIT DESCRIBED HEREIN; NEITHER DOES IT CONVEY ANY LICENSE UNDER ITS PATENT RIGHTS, NOR THE RIGHTS OF OTHERS.