www.fairchildsemi.com RC1616 0.5A Adjustable/Fixed Low Dropout Linear Regulator Features Description • • • • • • The RC1616 and RC1616-2.5, -3.3 and -5 are low dropout three-terminal regulators with 0.5A output current capability. These devices have been optimized for low voltage where transient response and minimum input voltage are critical. The 5V version is designed also to be used in USB Hub and Motherboard applications. Low dropout voltage Load regulation: 0.05% typical Current limit On-chip thermal limiting Standard SOT-223 and TO-252 packages Three-terminal adjustable or fixed 2.5V, 3.3V or 5V On-chip thermal limiting provides protection against any combination of overload and ambient temperature that would create excessive junction temperatures. Applications • USB Controlled Power Supply • High efficiency linear regulators for Mixed Voltage Logic, ASIC, FPGA based systems • Post regulators for switching supplies • Battery chargers • 5V to 3.3V, or 2.5V, 1.8V, 1.5V linear regulators • Motherboard clock supplies • SDRAM Module supplies Unlike PNP type regulators where up to 10% of the output current is wasted as quiescent current, the bias current of the RC1616 flows into the load, increasing efficiency. The RC1616 series regulators are available in the industrystandard SOT-223 and TO-252 power packages. Typical Applications RC1616 VIN = 3.3V VIN + VOUT 1.5V at 0.5A + 10µF 22µF 124Ω ADJ 24.9Ω RC1616-3.3 VIN = 5V + VIN VOUT 10µF 3.3V at 0.5A + 22µF GND REV. 1.0.8 5/20/02 PRODUCT SPECIFICATION RC1616 Pin Assignments RC1616S (Variable) RC1616S-X (Fixed) RC1616D (Variable) RC1616D-X (Fixed) Front View Front View Tab is VOUT 3 IN 2 OUT 1 ADJ/GND 1 4-Lead Plastic SOT-223 ΘJC = 15°C/W* 2 3 OUT ADJ/ GND IN 3-Lead Plastic TO-252 ΘJC = 3°C/W* *With package soldered to 0.5 square inch copper area over backside ground plane or internal power plane, ΘJA can vary from 30°C/W to >50°C/W. Other mounting techniques may provide better power dissipation than 30°C/W. Absolute Maximum Ratings Parameter Min. Max. Unit 7.5 V 0 125 °C -65 150 °C 300 °C VIN Operating Junction Temperature Range Storage Temperature Range Lead Temperature (Soldering, 10 sec.) 2 REV. 1.0.8 5/20/02 RC1616 PRODUCT SPECIFICATION Electrical Characteristics Operating Conditions: VIN ≤ 7V, TJ = 25°C unless otherwise specified. The • denotes specifications which apply over the specified operating temperature range. Parameter Conditions Voltage3 1.5V ≤ (VIN - VOUT) ≤ 5.75V, 10mA ≤ IOUT ≤ 0.5A Reference Output Voltage Line Regulation1,2 Load Regulation1,2,3 Dropout Voltage Min. Typ. Max. Units • 1.225 (-2%) 1.250 1.275 (+2%) V 10mA ≤ IOUT ≤ 0.5A RC1616-2.5, 4.0V ≤ VIN ≤ 7V RC1616-3.3, 4.5V ≤ VIN ≤ 7V RC1616-5, 6.2V ≤ VIN ≤ 7V • • • 2.450 3.234 4.900 2.500 3.300 5.000 2.550 3.366 5.100 V V V (VOUT + 1.5V) ≤ VIN ≤ 7V, IOUT = 10mA • 0.005 0.2 % (VIN – VOUT) = 2V, 10mA ≤ IOUT ≤ 0.5A • 0.05 0.5 % ∆VREF = 1%, IOUT = 0.5A • 1.000 1.200 V Current3 • 35 120 µA Adjust Pin Current Change3 1.5V ≤ (VIN – VOUT) ≤ 5.75, 10mA ≤ IOUT ≤ 0.5A • 0.2 5 µA Minimum Load Current 1.5V ≤ (VIN – VOUT) ≤ 5.75 • Quiescent Current VIN = VOUT + 1.25V • Ripple Rejection f = 120Hz, COUT = 22µF Tantalum, (VIN – VOUT) = 3V, IOUT = 0.5A Thermal Regulation TA = 25°C, 30ms pulse Adjust Pin mA 4 60 13 72 0.004 • Temperature Stability 10 mA dB 0.02 0.5 %/W % Long-Term Stability TA = 125°C, 1000hrs. 0.03 RMS Output Noise (% of VOUT) TA = 25°C, 10Hz ≤ f ≤ 10kHz 0.003 % Thermal Resistance, Junction SOT-223 to Case TO-252 15 °C/W 3 °C/W Thermal Shutdown 150 °C 1.0 % 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. 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. RC1616 only. REV. 1.0.8 5/20/02 3 PRODUCT SPECIFICATION RC1616 Typical Performance Characteristics 0.10 OUTPUT VOLTAGE DEVIATION (%) DROPOUT VOLTAGE (V) 1.5 1.4 1.3 1.2 1.1 1.0 TJ = 0°C TJ = 25°C 0.9 0.8 TJ = 125°C 0.7 0.6 0.5 0 0 0.2 0.4 0.6 0.8 0.05 0 -0.05 -0.10 -0.15 -0.20 -75 -50 -25 0 1.0 OUTPUT CURRENT (A) Figure 2. Load Regulation vs. Temperature 1.250 3.70 1.245 3.65 1.240 1.235 1.230 1.225 1.220 1.215 1.210 1.200 -75 -50 -25 0 VOUT = 3.6V1 3.60 3.55 3.50 3.45 3.40 3.35 VOUT = 3.3V 3.30 Note: 1. RC1616 Only 3.20 -75 -50 -25 0 25 50 75 100 125 150 175 25 50 75 100 125 150 175 JUNCTION TEMPERATURE (°C) Figure 3. Reference Voltage vs. Temperature JUNCTION TEMPERATURE (°C) Figure 4. Output Voltage vs. Temperature 5 100 Note: 1. RC1616 Only 90 ADJUST PIN CURRENT (µA) MINIMUM LOAD CURRENT (mA) VOUT SET WITH 1% RESISTORS 3.25 1.205 4 3 2 1 80 70 60 50 40 30 20 10 0 -75 -50 -25 0 25 50 75 100 125 150 175 JUNCTION TEMPERATURE (°C) Figure 5. Minimum Load Current vs. Temperature 4 25 50 75 100 125 150 175 JUNCTION TEMPERATURE (°C) REFERENCE VOLTAGE (V) REFERENCE VOLTAGE (V) Figure 1. Dropout Voltage vs. Output Current ∆I = 0.5A 0 -75 -50 -25 0 25 50 75 100 125 150 175 JUNCTION TEMPERATURE (°C) Figure 6. Adjust Pin Current vs. Temperature REV. 1.0.8 5/20/02 RC1616 PRODUCT SPECIFICATION Typical Performance Characteristics (continued) 90 80 RIPPLE REJECTION (dB) SHORT-CIRCUIT CURRENT (A) 1.50 1.25 1.00 0.75 70 60 50 40 30 20 10 0.50 -75 -50 -25 0 (VIN - VOUT) ≤ 3V 0.5 ≤ VRIPPLE ≤ 2V IOUT = 0.5A 0 10 25 50 75 100 125 150 175 TEMPERATURE (°C) 100 1K 10K 100K FREQUENCY (Hz) Figure 7. Short-Circuit Current vs. Temperature Figure 8. Ripple Rejection vs. Frequency 4 TO-252 POWER (W) 3 2 SOT-223 1 0 50 60 70 80 90 100 110 120 130 140 150 CASE TEMPERATURE (°C) Figure 9. Maximum Power Dissipation REV. 1.0.8 5/20/02 5 PRODUCT SPECIFICATION RC1616 Mechanical Dimensions 3-Lead TO-252 Package Symbol Inches Millimeters Notes: Notes Min. Max. Min. Max. A b b2 b3 c c2 .086 .025 .030 .205 .018 .018 .094 .035 2.19 0.64 0.76 5.21 0.46 0.46 2.39 0.89 D E e H 5.33 6.22 6.35 6.73 2.29 BSC 9.40 10.41 1.40 1.78 2.74 REF 1 L L1 .210 .245 .250 .265 .090 BSC .370 .410 .055 .070 .108 REF L3 L4 .035 .025 0.89 0.64 4 .045 .215 .024 .023 .080 .040 1.14 5.46 0.61 0.58 2.03 1.02 E @PKG/ @HEATSINK b3 4 1 1. Dimensions are exclusive of mold flash, metal burrs or interlead protrusion. 2. Stand off-height is measured from lead tip with ref. to Datum -B-. 3. Foot length is measured with ref. to Datum -A- with lead surface. 4. Thermal pad contour optional within dimension b3 and L3. 5. Formed leads to be planar with respect to one another at seating place -C-. 6. Dimensions and tolerances per ASME Y14.5M-1994. 3 L3 c2 D E-PIN H L4 b2 L1 L b e -B- α = 0° – 10° -A- A -C- 6 REV. 1.0.8 5/20/02 RC1616 PRODUCT SPECIFICATION Mechanical Dimensions 4-Lead SOT-223 Package Inches Symbol A A1 B c D E e F H I J K L M N Millimeters Min. Max. Min. Max. — — .025 — .248 .130 .071 .181 1.80 4.80 .033 .090 .264 .148 — — .640 — 6.30 3.30 .840 2.29 6.71 3.71 .115 .033 .264 .012 — 10° .0008 10° .010 .124 .041 .287 — 10° 16° .0040 16° .014 2.95 .840 6.71 .310 — 10° .0203 10° .250 3.15 1.04 7.29 — 10° 16° .1018 16° .360 Notes D e K A H E N J M B I L A1 c REV. 1.0.8 5/20/02 F 7 PRODUCT SPECIFICATION RC1616 Ordering Information Product Number Package RC1616D TO-252 RC1616S SOT-223 RC1616D-2.5 TO-252 RC1616S-2.5 SOT-223 RC1616D-3.3 TO-252 RC1616S-3.3 SOT-223 RC1616D-5 TO-252 RC1616S-5 SOT-223 DISCLAIMER 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. 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