500mA, Low Dropout, Low Noise Ultra-Fast With Soft Start CMOS LDO Regulator General Description The is a 500mA, low dropout and low noise linear regulator with high ripple rejection ratio. It has fixed output voltage ranging from 1.8V to 3.3V. The includes a reference voltage source, an error amplifier, driver transistors and an internal current limiter. It also incorporates current fold-back to reduce power dissipation when the output is short circuited. The works well with low ESR ceramic capacitors, suitable for portable RF and wireless battery-powered applications with stringent space requirements and demanding performance. It also offers ultra low noise output and has low quiescent current. Ordering Information - Features Ultra-Low-Noise Application Wide 2.5V to 6V Operating Range Stable with Low-ESR Output Capacitor. Six Fixed Voltage Options Available Internal Current Limiter Short Circuit Current Fold-back Thermal Shutdown Protection Low Dropout : 270mV @ 500mA High Ripple Rejection 70dB@1kHz Standby Current Less Than 0.1μA Auto Discharge Applications Battery-Powered Equipment Portable Instruments Digital Camera WLAN Communication Hand-Held Instruments Packing Package R: Tape and Reel C50:SC-70-5 A50:SOT-23-5 B50:TSOT-23-5 I23:TO-252-2L Output Voltage Voltage Code 1.8 18 2.5 25 2.7 27 2.8 28 3.0 30 3.1 31 3.3 33 Marking Information For marking information, please contact our sales representative directly or through distributor around your location. Other voltage outputs may be available. For further details, please contact an idesyn sales or distributor. Jan. 2013 1 Rev 1.1
Typical Application Circuit V IN C IN 1µF/ X7R V IN V OUT C OUT 1µF/ X7R V OUT Enable 100K EN SS GND C SS 0.5nF/ X7R Absolute Maximum Ratings (Note 1) Recommended Operating Conditions Supply Voltage V IN 6V Input Voltage V IN 2.5V to 6V Power Dissipation, P D @ T A =25 C EN Input Voltage 0V to 6V SC-70-5 300mW Junction Temperature -40 C to 125 C (T)SOT-23-5 400mW Ambient Operating Temperature 40 C to 85 C TO-252-2L 1200mW Thermal Resistance, JA SC-70-5 333 C/W (T)SOT-23-5 250 C/W TO-252-2L 83.3 C/W Lead Temperature 260 C Storage Temperature -65 C to 150 C ESD Susceptibility HBM (Human Body Mode) MM (Machine Mode) 4kV 300V Jan. 2013 2 Rev 1.1
Electrical Characteristics (Unless otherwise specified V IN = V OUT + 1V, T A =25 C) Parameters Symbol Condition Min Typ Max Units Operating Voltage Range (Note 2) V IN 6 V Standby Current I SBY V EN = GND,Shutdown 0.01 1 μa Quiescent Current I Q 90 μa Supply Current Limit (Note 3) I LIMIT V OUT > 200mV 800 1000 1200 ma Short Circuit Current I SC V OUT < 200mV 110 200 ma V OUT = 1.8V 900 1200 mv V OUT = 2.5V 390 500 mv V OUT = 2.7V 320 420 mv Dropout Voltage (Note 4) V DROP I OUT = 500mA V OUT = 2.8V 300 380 mv V OUT = 3.0V 280 350 mv V OUT = 3.1V 275 340 mv V OUT = 3.3V 270 330 mv EN input Bias Current I IBSD V EN = GND or V IN 0 100 na Line Regulation ΔV LINE V IN = (V OUT +1V) to 5.5V, I OUT = 1mA 10 mv/v Load Regulation ΔV LOAD 1mA < I OUT < 500mA 25 40 mv Output Noise Voltage eno 10Hz to 100KHz I OUT = 200mA C OUT = 1μF 100 μv RMS Thermal Shutdown Temperature T SD 165 C Thermal Shutdown Temperature Hysteresis ΔT SD 30 C Output Voltage Accuracy ΔV OUT I OUT = 1mA -2 +2 % C IN = 1μF, C OUT = 1μF, C ss = Soft Start Time T SS NC, V OUT =3.3V, I OUT = 0mA, 9 μs T SS =0 to V OUT 90% Fast Discharge N-MOSFET Turn On Resistance R DISCHARGE V IN = 4V, V EN = 0V 35 Ω EN Threshold Logic-Low V V IL V IN = 3V to 5.5V,Shutdown 0.4 V Logic-High V V IH V IN = 3V to 5.5V,Start-up 1.2 V Power Supply f = 100Hz -70 PSRR C Rejection Rate OUT = 1μF, I OUT = 10mA f = 10kHz -55 db Note 1: Stresses listed as the above "Absolute Maximum Ratings" may cause permanent damage to the device. These are for stress ratings. Functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may remain possibility to affect device reliability. Note 2: VIN(MIN)=VOUT+VDROPOUT Note 3: To prevent the Short Circuit Current protection feature from being prematurely activated, the input and enable voltage must be applied before a current source load is applied. Note 4: The dropout voltage is defined as (VIN-VOUT) when VOUT is 100mV below the target value of VOUT. Jan. 2013 3 Rev 1.1
Pin Configurations (Top View) (T)SOT-23-5 / SC-70-5 TO-252-2L Pin Description (T)SOT-23-5 SC-70-5 TO-252-2L Name 1 1 VIN Input Voltage. 2 FIN GND Ground. Pin Function 3 EN Chip Enable (Active High). Note that this pin is high impedance. There should be a pull low 100K resistor connected to GND when the control signal is floating. 4 SS Soft Start. 5 3 VOUT Output Voltage. Function Block Diagram EN Shutdown and Logic Control VIN SS V REF + - Error Amplifier MOS Driver Current-Limit and Thermal Protection VOUT GND Jan. 2013 4 Rev 1.1
Typical Operating Characteristics (Unless otherwise specified, V IN = V OUT + 1V, C IN = C OUT = 1μF, C SS = 1nF, T A = 25 C) Load Regulation Line Regulation 3.14 3.14 3.13 3.13 Output Voltage (V) 3.12 3.11 3.10 3.09 V OUT =3.1V Output Voltage (V) 3.12 3.11 3.10 3.09 V OUT =3.1V I OUT = 10mA 3.08 0 100 200 300 400 500 Output Current (ma) 3.08 3.5 4.0 4.5 5.0 5.5 6.0 Input Voltage (V) 105 Input Voltage vs. Quiescent Current 1.00 Input Voltage vs. Shutdown Current Quiescent Current (μa) 100 95 90 85 80 V OUT =3.1V V EN = V IN Shutdown Current (μa) 0.80 0.60 0.40 0.20 V EN =GND 75 3.5 4 4.5 5 5.5 6 Input Voltage (V) 0.00 3.5 4 4.5 5 5.5 6 Input Voltage (V) 300 Dropout Voltage vs. Output Current 0.95 Input Voltage vs. Current Limit 250 0.90 Dropout Voltage (mv) 200 150 100 50 V OUT =3.1V Current Limit (A) 0.85 0.80 0.75 0.70 V OUT Connect 0.1Ω to GND 0 0 100 200 300 400 500 Output Current (ma) 0.65 3.5 4 4.5 5 5.5 6 Input Voltage (V) Jan. 2013 5 Rev 1.1
Enable Threshold Voltage vs. Temperature C SS Capacitor vs. Soft Start Time 1.00 10 Enable Threshold Voltage (V) 0.90 0.80 0.70 0.60 0.50 0.40 3.5 4 4.5 5 5.5 6 Input Voltage (V) Soft Start Time (ms) 8 6 4 2 V IN = 5.0V, V OUT = 3.1V 0 0 1 2 3 4 5 6 7 8 9 10 C SS Capacitor (nf) 80 PSRR 100 Region of Stable C OUT ESR vs. Output Current 70 10 Instable PSRR (-db) 60 V OUT 3.1V, I LOAD = 10mA V OUT 3.1V, I LOAD = 50mA 50 V IN =4.1V DC +0.5V P-P ; C IN =C OUT =1 F 40 100 1000 1K 10000 10K 100000 100K COUT -ESR (Ω) 1 Stable 0.1 0.01 Simulation verify C IN = C OUT =1 F 0.001 0 50 100 150 200 250 300 Frequency (Hz) Output Current (ma) Load Transient Response Load Transient Response V OUT (AC) (50.0mV/Div) V OUT (AC) (50.0mV/Div) I OUT (DC) (200mA/Div) V IN = 4.5V, V OUT = 3.1V, I OUT = 1mA to 300mA I OUT (DC) (200mA/Div) V IN = 5.0V, V OUT = 3.1V, I OUT = 1mA to 500mA Time (400μs/Div) Time (400μs/Div) Jan. 2013 6 Rev 1.1
Line Transient Response Line Transient Response V OUT (AC) (10.0mV/Div) V OUT (AC) (10.0mV/Div) V IN DC) (1.00V/Div) V IN = 3.8V to 4.8V V OUT = 3.3V, I OUT = 10mA V IN (DC) (1.00V/Div) V IN = 3.8V to 4.8V V OUT = 3.3V, I OUT = 100mA Time (100μs/Div) Time (100μs/Div) Start-up from EN Start-up from V IN V EN (DC) V IN (DC) V OUT (DC) V OUT (DC) I IN (DC) (500mA/Div) I OUT =500mA (Resistive Load) V IN = 4.5V, V OUT = 3.1V, C SS =22nF I IN (DC) (500mA/Div) I OUT =500mA (Resistive Load) V IN = 4.5V, V OUT = 3.1V, C SS =22nF Time (5.00ms/Div) Time (5.00ms/Div) Shutdown from EN Shutdown from V IN V EN (DC) V IN (DC) V OUT (DC) I OUT =500mA (Resistive Load) V IN = 4.5V, V OUT = 3.1V, C SS =22nF V OUT (DC) I OUT =500mA (Resistive Load) V IN = 4.5V, V OUT = 3.1V, C SS =22nF Time (10.0μs/Div) Time (4.00ms/Div) Jan. 2013 7 Rev 1.1
Shutdown from EN Shutdown from V IN V EN (DC) V IN (DC) V OUT (DC) I OUT =0mA V IN =4.5V, V OUT = 3.1V, C SS =22nF V OUT (DC) I OUT =0mA V IN =4.5V, V OUT = 3.1V, C SS =22nF Time (40.0μs/Div) Time (20.0ms/Div) Soft Start Time Short Circuit Operation V EN (DC) (5.00V/Div) T SS =8.7μs V IN (DC) (2V/Div) V OUT 90% V OUT (DC) (200mV/Div) V OUT (DC) I OUT =0mA V IN = V EN =4.3V, V OUT = 3.3V, C SS =NC I IN (DC) (200mA/Div) V OUT Connected to GND V IN = 4.5V, V OUT = 3.1V, C SS =1nF Time (2.00μs/Div) Time (2.5ms/Div) Jan. 2013 8 Rev 1.1
Application Information Capacitor Selection and Regulator Stability Input Capacitor An input capacitance of 1μF is required between the device input pin and ground directly (the amount of the capacitance may be increased without limit). The input capacitor MUST be located less than 1 cm from the device to assure input stability (see PCB Layout Section). A lower ESR capacitor allows the use of less capacitance, while higher ESR type (like aluminum electrolytic) requires more capacitance. Capacitor types (aluminum, ceramic and tantalum) can be mixed in parallel, but the total equivalent input capacitance/esr must be defined as above for stable operation. There are no requirements for the ESR on the input capacitor, but tolerance and temperature coefficient must be considered when selecting the capacitor to ensure the capacitance is 1μF over the entire operating range. Output Capacitor The is designed specifically to work with very small ceramic output capacitors. The minimum capacitance recommended (temperature characteristics of X7R, X5R, Z5U or Y5V) is within the 1μF to 10μF range with 5mΩ to 50mΩ ESR range ceramic capacitor between LDO output and GND for transient stability, but it may be increased without limit. Higher capacitance values help to improve transient response. The output capacitor's ESR is critical because it forms a zero to provide phase lead which is required for loop stability. Enable Function The is shut down by pulling the EN pin low, and turned on by driving the input high. If the shutdown feature is not required, the EN pin should be tied to VIN to keep the regulator on at all times (the EN pin MUST NOT be left floating). To assure proper operation, the signal source used to drive the EN pin must be able to swing above and below the specified turn-on/off voltage thresholds listed in the Electrical Characteristics under VIH and VIL. The ON/OFF signal may come from either CMOS output, or an open-collector output with pull-up resistor to the device input voltage or another logic supply. The highlevel voltage may exceed the device input voltage, but must remain within the absolute maximum ratings for the EN pin. Operating Region and Power Dissipation Since the is a linear regulator, its power dissipation is always given by P = I OUT (V IN V OUT ). The maximum power dissipation is given by: P D(MAX) = (T J T A ) /θ JA =(125 C -25 C)/250 C/W = 400mW Where (T J T A ) is the temperature difference the die and the ambient air, θ JA is the thermal resistance of the chosen package to the ambient air. For surface mount device, heat sinking is accomplished by using the heat spreading capabilities of the PC board and its copper traces. In the case of a SOT-23-5 package, the thermal resistance is typically 250 C /Watt. Refer to Figure 1 & 2 for the valid operating region (Safe Operating Area) and refer to Figure 3 for maximum power dissipation information of SOT-23-5. The die attachment area of the lead frame is connected to pin 2, which is the GND pin. Therefore, the GND pin of can dissipate the heat from the die very effectively. To improve the maximum power providing capability, connect the GND pin to ground using a large ground plane near the GND pin. Short Circuit Current Fold-Back This feature becomes active when the output drops below 200mV, and reduces the current flow by 80%. Full current is restored when the voltage exceeds 200mV. Jan. 2013 9 Rev 1.1
Output Current IOUT (ma) 250 200 150 100 50 Safe Operation Area of I OUT =150mA [Power Dissipation Limit] Still air SOT-23-5 package Mounted on recommended footprint ( JA =250 C/W) T A =85 C 0 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 2.2 2.4 2.6 2.8 3.0 3.2 3.4 3.6 3.8 4.0 Input-Output Voltage Differential V IN -V OUT (V) Fig. 1 T A =55 C T A =25 C Output Current IOUT (ma) 400 350 300 250 200 150 100 50 Safe Operation Area of I OUT =300mA [Power Dissipation Limit] Still air SOT-23-5 package Mounted on recommended footprint ( JA =250 C/W) T A =85 C T A =25 C 0 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 2.2 2.4 2.6 2.8 3.0 3.2 3.4 3.6 3.8 4.0 Input-Output Voltage Differential V IN -V OUT (V) Fig. 2 T A =55 C 0.5 Maximum Power Dissipation Power Dissipation PD(W) 0.45 0.4 0.35 0.3 0.25 0.2 0.15 0.1 0.05 0 Still air SOT-23-5/SC-70-5 package Mounted on recommended footprint SC-70-5 SOT-23-5 25 35 45 55 65 75 85 95 105 115 125 Ambient Temperature T A ( C) Fig. 3 Jan. 2013 10 Rev 1.1
Packaging SC-70-5 DIMENSIONS IN SYMBOLS MILLIMETERS DIMENSIONS IN INCH MIN NOM MAX MIN NOM MAX A 0.90 --- 1.10 0.036 --- 0.044 A1 0.025 --- 0.10 0.001 --- 0.004 A2 0.875 --- 1.00 0.035 --- 0.040 b 0.20 --- 0.40 0.008 --- 0.016 C 0.10 --- 0.15 0.004 --- 0.006 D 1.90 --- 2.10 0.076 --- 0.084 E 1.15 --- 1.35 0.046 --- 0.054 E1 2.00 --- 2.20 0.080 --- 0.088 e 0.65 BSC. 0.026 BSC. e1 1.30 BSC. 0.052 BSC. L 0.425 REF. 0.017 REF. Jan. 2013 11 Rev 1.1
SOT-23-5 SYMBOLS DIMENSIONS IN MILLIMETERS DIMENSIONS IN INCH MIN NOM MAX MIN NOM MAX A 1.00 1.10 1.30 0.039 0.043 0.051 A1 0.00 --- 0.10 0.000 --- 0.004 A2 0.70 0.80 0.90 0.027 0.031 0.035 b 0.35 0.40 0.50 0.013 0.016 0.020 C 0.10 0.15 0.25 0.004 0.006 0.001 D 2.70 2.90 3.10 0.106 0.114 0.122 E 1.50 1.60 1.80 0.059 0.063 0.071 e --- 1.90(TYP) --- --- 0.075 --- H 2.60 2.80 3.00 0.102 0.110 0.118 L 0.370 --- --- 0.015 --- --- Θ1 1 5 9 1 5 9 e1 --- 0.95(TYP) --- --- 0.037 --- Jan. 2013 12 Rev 1.1
TSOT-23-5 SYMBOLS DIMENSIONS IN MILLIMETERS DIMENSIONS IN INCH MIN NOM MAX MIN NOM MAX A 0.75 --- 0.90 0.030 --- 0.035 A1 0.00 --- 0.10 0.000 --- 0.004 A2 0.58 0.68 0.78 0.023 0.027 0.030 A3 0.84 0.87 0.90 0.033 0.034 0.035 b 0.35 0.40 0.50 0.014 0.016 0.020 C 0.10 0.125 0.15 0.004 0.005 0.006 D 2.70 2.90 3.10 0.106 0.114 0.122 E 1.50 1.60 1.80 0.059 0.063 0.071 e --- 1.90(TYP) --- --- 0.075(TYP) --- H 2.60 2.80 3.00 0.102 0.110 0.118 L 0.370 --- --- 0.015 --- --- Θ1 1 5 9 1 5 9 e1 --- 0.95(TYP) --- --- 0.037 --- Jan. 2013 13 Rev 1.1
TO-252-2L SYMBOLS DIMENSIONS IN MILLIMETERS DIMENSIONS IN INCH MIN NOM MAX MIN NOM MAX A 2.18 --- 2.39 0.086 --- 0.094 A1 1.02 --- 1.27 0.040 --- 0.050 b --- 0.61 --- --- 0.024 --- b2 5.21 --- 5.46 0.205 --- 0.215 c 0.46 --- 0.58 0.018 --- 0.023 c1 0.46 --- 0.58 0.018 --- 0.023 D 5.33 --- 5.59 0.210 --- 0.220 E 6.35 --- 6.73 0.250 --- 0.265 D1 4.57 --- --- 0.180 --- --- E1 3.81 --- --- 0.150 --- --- e --- 2.29 --- --- 0.090 --- e1 --- 4.57 --- --- 0.180 --- H 9.40 --- 10.44 0.370 --- 0.411 L 0.51 --- 0.00 0.020 --- L1 0.64 --- 1.02 0.025 --- 0.040 L2 1.52 --- 2.03 0.060 --- 0.080 Jan. 2013 14 Rev 1.1
Footprints (T)SOT-23-5 Footprint Dimension (mm) Package Number of PIN Tolerance P1 P2 A B C D M SOT23-5 5 0.95 1.90 3.60 1.60 1.00 0.70 2.60 ±0.10 SC-70-5 Footprint Dimension (mm) Package Number of PIN Tolerance P1 P2 A B C D M SC70-5 5 0.65 1.30 2.70 1.10 0.80 0.40 1.70 ±0.10 Jan. 2013 15 Rev 1.1
TO-252-2L Footprint Dimension (mm) Package Number of PIN Tolerance P A B C D M TO-252-2L 2 4.60 11.50 2.00 2.50 1.50 7.00 ±0.10 Jan. 2013 16 Rev 1.1