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| EUP7915 150mA Low-Noise LDO in SOT23-5 DESCRIPTION The EUP7915 is an efficient, CMOS voltage regulator optimized for ultra-low-noise applications. It offers high output accuracy, extremely low dropout voltage low ground current and fast start-up time. The EUP7915 provides a very low noise output, ideal for RF applications where a clean voltage source is required. A noise bypass pin is also available for further reduction of output noise. Designed specifically for handheld and batterypowered devices, the EUP7915 provides a TTL-logic-compatible enable pin. When disabled, power consumption drops nearly to zero. The EUP7915 also works with low-ESR ceramic capacitors, reducing the amount of board space necessary for power applications, critical in handheld wireless devices. Available in the SOT23-5 package, the EUP7915 offers a wide range of output voltages. Key features include current limit, thermal shutdown and faster transient response. FEATURES 5-pin SOT23-5 Package 2.5V to 5.5V Input Voltage Range 50V(rms) Output Noise 140mV Dropout @ 150mA 75dB PSRR at 1kHz Low 70A Ground Current 150mA Output Current Stability with 1F Ceramic Output Capacitors Excellent Load/Line Transient Thermal Shutdown and Current Limit Protection Available in 1.2V,1.5V,1.8V,2.5V,2.8V,2.85V, 2.9V,3.0V,3.3V,4.8V and Adjustable Voltages RoHS Compliant and 100% Lead (Pb)-Free APPLICATIONS Cellular Phones Bluetooth Portable Radios and Accessories PDA and Palmtop Computers Consumer/Personal Electronics Block Diagram Figure 1. Fixed-Voltage DS7915 Ver1.4 Apr. 2008 1 EUP7915 Block Diagram (Continued) Figure 2. Adjustable Voltage Typical Application Circuit Figure 3. Fixed Output Voltage Regulator Figure 4. Adjustable Voltage Regulator DS7915 Ver1.4 Apr. 2008 2 EUP7915 Pin Configurations Package Type Pin Configurations SOT23-5 Fixed-Voltage Adjustable Voltage Pin Description PIN VIN GND VEN BYPASS ADJ VOUT PIN 1 2 3 4 5 Input voltage of the LDO Common ground Enable input logic, enable high Optional bypass capacitor for noise reduction Adjustable regulator feedback input. Connect to resistor divider. Output voltage of the LDO DESCRIPTION DS7915 Ver1.4 Apr. 2008 3 EUP7915 Ordering Information Order Number Package Type Marking Operating Temperature Range EUP7915-12VIR1 EUP7915-15VIR1 EUP7915-18VIR1 EUP7915-25VIR1 EUP7915-28VIR1 EUP7915-285VIR1 EUP7915-29VIR1 EUP7915-30VIR1 EUP7915-33VIR1 EUP7915-48VIR1 EUP7915VIR1 EUP7915- 1/4 1/4 1/4 1/4 SOT23-5 SOT23-5 SOT23-5 SOT23-5 SOT23-5 SOT23-5 SOT23-5 SOT23-5 SOT23-5 SOT23-5 SOT23-5 1/4 ZT 1/4 ZC 1/4 ZD 1/4 ZB 1/4 ZE 1/4 ZF 1/4 ZW 1/4 ZG 1/4 ZH 1/4 ZK 1/4 ZA 1/4 1/4 1/4 1/4 1/4 1/4 1/4 1/4 1/4 1/4 1/4 1/4 1/4 1/4 1/4 1/4 1/4 1/4 1/4 1/4 1/4 1/4 1/4 1/4 1/4 1/4 1/4 1/4 1/4 1/4 1/4 1/4 1/4 1/4 -40 C to 125C -40 C to 125C -40 C to 125C -40 C to 125C -40 C to 125C -40 C to 125C -40 C to 125C -40 C to 125C -40 C to 125C -40 C to 125C -40 C to 125C Lead Free Code 1: Lead Free 0: Lead Packing R: Tape & Reel Operating temperature range I: Industry Standard Package Type V: SOT-23 Output Voltage 12: 1.2V 15: 1.5V 18: 1.8V 25: 2.5V 28: 2.8V 285: 2.85V 29: 2.9V 30: 3.0V 33: 3.3V 48: 4.8V Blank: Adjustable Absolute Maximum Ratings VIN,VEN ------------------------------------------------------------------------------- -0.3 to 6V VOUT ----------------------------------------------------------------- -0.3 to (VIN+0.3) 6V Junction Temperature ------------------------------------------------------------------- 150C Storage Temperature Range ------------------------------------------------- -65C to +150C Lead Temperature ----------------------------------------------------------------------- 260C Maximum Power Dissipation --------------------------------------------------------0.3W Thermal Resistance JA -------------------------------------------------------------- 320C/W ESD Rating Human Body Model ------------------------------------------------------------------- 2kV Operating Ratings VIN ---------------------------------------------------------------------------------- 2.5 to 5.5V VEN -------------------------------------------------------------------- 0 to (VIN+0.3) 5.5V Operating Temperature Range -------------------------------------------- -40C to +125C DS7915 Ver1.4 Apr. 2008 4 EUP7915 Electrical Characteristics Conditions: VIN=VOUT+0.2V if VOUTU 2.5V, VIN=2.5V if VOUT<2.5V ,VEN=VIN, CIN=1uF, COUT=1uF,TA= -40~ 85J Unless otherwise specified. Typical values are at 25J . Symbol Parameter Input Voltage Conditions IOUT=1mA,TA=25J IOUT=1mA,TA=-40J to 85J TA>0, VIN=VOUT + 0.2V for VOUT > 3.3V or VIN=VOUT +0.5V VOUT=VOUT(nom) x 90%, TA>0J IOUT=150mA, VOUT<3.3V IOUT=100mA, VOUT>3.3V IOUT=1mA VIN=(VOUT+0.2V) to 5.5V, IOUT=1mA 1mA IOUT 100mA (VIN=VOUT + 0.2V) 1mA IOUT 150mA (VIN=VOUT + 0.5V) VEN=0,TA=25J VIN=(VOUT+1V)DC+0.5VP-P f=1kHz, ILOAD=10mA EUP7915 Min Typ Max. 2.5 -2 -3 150 160 220 140 60 70 0.02 0.002 400 240 100 160 0.25 0.013 1 75 50 239 200 0.4 1.5 1 1 1.176 1.2 155 15 1.224 5.5 2 3 Unit V % % mA mA mV A %/V %/mA A dB V V s V V nA nA V J J VOUT Output Voltage Accuracy IOUTMAX Maximum Output Current ILIMIT VDROP IQ VLNR VLDR ISHDN PSRR Current Limit Dropout Voltage (Note1) Quiescent Current Line Regulation Load Regulation Shutdown Supply Current Power Supply Ripple Rejection Output Noise Voltage f=10Hz~100kHz, ILOAD=10mA (Bypass) Output Noise Voltage (ADJ) f=10Hz~100kHz, ILOAD=10mA Turn-on Time (Note2) RLOAD=50,TA=25J VENL (Maximum Low Level VIN=2.5V to 5.5V Input Voltage at EN) VENH (Minimum high Level VIN=2.5V to 5.5V Input Voltage at EN) VEN Input Bias Current VIN=5.5V, VEN=0 or 5.5V FB Input Bias Current (ADJ VIN=5.5V, VFB=1.3V Version) FB Pin Voltage (ADJ TA=25J Version) Thermal Shutdown Temperature Thermal Shutdown Hysteresis VENL VENH VFB TSD TSD Note 1: The dropout voltage is defined as VIN-VOUT when VOUT is 100mV below the nominal value of VOUT. Note 2: Test time needed for VOUT to reach 90% of final value. DS7915 Ver1.4 Apr. 2008 5 EUP7915 Typical Operating Characteristics OUTPUT VOLTAGE vs. INPUT VOLTAGE 3.0 OUTPUT VOLTAGE (V) 2.5 2.0 1.5 1.0 IOUT=120mA OUTPUT VOLTAGE ACCURACY vs. LOAD CURRENT 0.4 DEVIATION (%) IOUT=0mA 0.2 0.0 -0.2 0.5 0.0 0 1 2 3 4 INPUT VOLTAGE (V) 5 6 -0.4 0 20 40 60 80 LOAD CURRENT (mA) 100 120 OUTPUT VOLTAGE ACCURACY vs. TEMPERATURE 0.8 IOUT=1mA DROPOUT VOLTAGE vs. LOAD CURRENT 120 (VOUT=2.5V, Dropout Voltage=VIN-VOUT) DROPOUT VOLTAGE (mV) DEVIATION (%) 0.4 Temp=85 C 80 o Temp=25 C o 0.0 40 -0.4 Temp=-40 C o -0.8 -40 -15 10 35 o 60 85 0 0 20 40 60 80 100 120 Temperature ( C) LOAD CURRENT (mA) GROUND CURRENT vs. INPUT VOLTAGE 200 GROUND CURRENT vs. LOAD CURRENT 200 GROUND CURRENT (uA) 160 IOUT=120mA GROUND CURRENT (uA) 160 Vin=5.5V 120 Vin=3.3V 80 120 80 40 IOUT=0mA 40 0 0 0 1 2 3 4 5 6 0 20 INPUT VOLTAGE (V) LOAD CURRENT (mA) 40 60 80 100 120 DS7915 Ver1.4 Apr. 2008 6 EUP7915 GROUND CURRENT vs. TEMPERATURE 120 GROUND CURRENT (uA) 100 80 60 40 20 0 -40 -20 0 20 TEMPERATURE ( C) 40 60 o 80 100 120 140 DS7915 Ver1.4 Apr. 2008 7 EUP7915 DS7915 Ver1.4 Apr. 2008 8 EUP7915 Application Note External Capacitors Like any low-dropout regulator, the EUP7915 requires external capacitors for regulator stability. The EUP7915 is specifically designed for portable applications requiring minimum board space and smallest components. These capacitors must be correctly selected for good performance. Input Capacitor An input capacitance of 1F is required between the EUP7915 input pin and ground (the amount of the capacitance may be increased without limit). This capacitor must be located a distance of not more than 1cm from the input pin and returned to a clean analog ground. Any good quality ceramic, tantalum, or film capacitor may be used at the input. If a tantalum capacitor is used at the input, it must be guaranteed by the manufacturer to have a surge current rating sufficient for the application. 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 will be 1F over the entire operating temperature range. Output Capacitor The EUP7915 is designed specifically to work with very small ceramic output capacitors. A ceramic capacitor (temperature characteristics X7R, X5R, Z5U, or Y5V) in 1 to 22F range with 5m to 500m ESR range is suitable in the EUP7915 application circuit. The output capacitor must meet the requirement for minimum amount of capacitance and also have an ESR (Equivalent Series Resistance) value which is within a stable range (5m to 500m) No-Load Stability The EUP7915 will remain stable and in regulation with no external load. This is specially important in CMOS RAM keep-alive applications. Capacitor Characteristics The EUP7915 is designed to work with ceramic capacitors on the output to take advantage of the benefits they offer: for capacitance values in the range of 1F to 4.7F range, ceramic capacitors are the smallest, least expensive and have the lowest ESR values (which makes them best for eliminating high frequency noise). The ESR of a typical 1F ceramic capacitor is in the range of 20m to 40m, which easily meets the ESR requirement for stability by the EUP7915. The ceramic capacitor's capacitance can vary with temperature. The capacitor type X7R, which operates over a temperature range of -55C to +125C, will only vary the capacitance to within 15%. Most large value ceramic capacitors ( 2.2F) are manufactured with Z5U or Y5V temperature characteristics. Their DS7915 Ver1.4 Apr. 2008 capacitance can drop by more than 50% as the temperature goes from 25C to 85C. Therefore, X7R is recommended over Z5U and Y5V in applications where the ambient temperature will change significantly above or below 25C. Noise Bypass Capacitor Connecting a 0.01F capacitor between the CBYPASS pin and ground significantly reduces noise on the regulator output. This cap is connected directly to a high impedance node in the bandgap reference circuit. Any significant loading on this node will cause a change on the regulated output voltage. For this reason, DC leakage current through this pin must be kept as low as possible for best output voltage accuracy. The types of capacitors best suited for the noise bypass capacitor are ceramic and film. Unlike many other LDO's, addition of a noise reduction capacitor does not effect the load transient response of the device. Adjustable Operation The adjustable version of the EUP7915 has an output voltage range of 1.2V to 5.3V. The output voltage of the EUP7915 adjustable regulator is programmed using an external resistor divider as shown in Figure 5. The output voltage is calculated using: V =V O ref x (1 + R R 1) 2 Where: Vref= 1.2V typ. (the internal reference voltage) Utilize the following equation for adjusting the output to a particular voltage: V R 1 = R 2 O - 1 1.2V Choose R2=50k to optimize accuracy, power supply rejection, noise and power consumption. Figure5. Adjustable Regulator with Resistors 9 EUP7915 On/Off Input Operation The EUP7915 is turned off by pulling the VEN pin low, and turned on by pulling it high. If this feature is not used, the VEN pin should be tied to VIN to keep the regulator output on at all time. To assure proper operation, the signal source used to drive the VEN input must be able to swing above and below the specified turn-on/off voltage thresholds listed in the Electrical Characteristics section under VIL and VIH. Fast Start up The EUP7915 output starts up after Vref voltage reaches its final value (1.2V nomial). The start-up time is determined by the time constant of the bypass capacitor. The smaller the capacitor value., the shorter the start-up time, but less noise gets reduced. As a result, start-up time and noise reduction need to be taken into design consideration when choosing the value of the bypass capacitor. DS7915 Ver1.4 Apr. 2008 10 EUP7915 Packaging Information SOT23-5 SYMBOLS A A1 D E1 E L b e - MILLIMETERS MIN. MAX. 1.30 0.15 2.90 1.60 2.60 0.30 0.30 0.95 3.00 0.60 0.50 0.102 0.012 0.012 MIN. 0.000 INCHES MAX. 0.052 0.006 0.114 0.063 0.118 0.024 0.020 0.037 0.00 DS7915 Ver1.4 Apr. 2008 11 |
Price & Availability of EUP7915-28VIR1
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