EUP7917 EUTECH | Alldatasheet

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Technical content

DS7917 Ver1.2 Mar. 2008 300mA, High PSRR Low-Noise LDO

DESCRIPTION

The EUP7917 is an efficien t, 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 EUP7917 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 battery- powered devices, the EUP7917 provides a TTL-logic-compatible enable pin. When disabled, power consumption drops nearly to zero. The EUP7917 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 SC-70 and SOT23-5 package, the EUP7917 offers a wide range of output voltages. Key features include current limit, thermal shutdown and faster transient response. Block Diagram

FEATURES

z Space-Saving 5-pin SC-70 Package z 2.5V to 6V Input Voltage Range z 50µV(rms) Output Noise z 250mV Dropout @ 300mA z 75dB PSRR at 1kHz z Low 70µA Ground Current z Up to 300mA Output Current z Stability with 1µF Ceramic Output Capacitors z Excellent Load/Line Transient z Thermal Shutdown and Current Limit Protection and Adjustable Voltages z RoHS Compliant and 100% Lead (Pb)-Free

APPLICATIONS

z Bluetooth Portable Radios and Accessories z PDA and Palmtop Computers z Consumer/Personal Electronics Figure 1.

Figure 2. Fixed-Voltage LDO Regulator Adjustable regulator feedback input. Connect to resistor divider.

DS7917 Ver1.2 Mar. 2008

Ordering Information

Order Number Package Type Marking Operating Temperature range EUP7917-12NIR1 SC-70 pT xx -40 °C to 125°C EUP7917-13NIR1 SC-70 pX xx -40 °C to 125°C EUP7917-15NIR1 SC-70 pC xx -40 °C to 125°C EUP7917-18NIR1 SC-70 pD xx -40 °C to 125°C EUP7917-185NIR1 SC-70 pU xx -40 °C to 125°C EUP7917-25NIR1 SC-70 pB xx -40 °C to 125°C EUP7917-28NIR1 SC-70 pE xx -40 °C to 125°C EUP7917-285NIR1 SC-70 pF xx -40 °C to 125°C EUP7917-29NIR1 SC-70 pW xx -40 °C to 125°C EUP7917-30NIR1 SC-70 pG xx -40 °C to 125°C EUP7917-33NIR1 SC-70 pH xx -40 °C to 125°C EUP7917-35NIR1 SC-70 pR xx -40 °C to 125°C EUP7917-48NIR1 SC-70 pK xx -40 °C to 125°C EUP7917NIR1 SC-70 pA xx -40 °C to 125°C EUP7917-12VIR1 SOT23-5 pT xxxx -40 °C to 125°C EUP7917-13VIR1 SOT23-5 pX xxxx -40 °C to 125°C EUP7917-15VIR1 SOT23-5 pC xxxx -40 °C to 125°C EUP7917-18VIR1 SOT23-5 pD xxxx -40 °C to 125°C EUP7917-185VIR1 SOT23-5 pU xxxx -40 °C to 125°C EUP7917-25VIR1 SOT23-5 pB xxxx -40 °C to 125°C EUP7917-28VIR1 SOT23-5 pE xxxx -40 °C to 125°C EUP7917-285VIR1 SOT23-5 pF xxxx -40 °C to 125°C EUP7917-29VIR1 SOT23-5 pW xxxx -40 °C to 125°C EUP7917-30VIR1 SOT23-5 pG xxxx -40 °C to 125°C EUP7917-33VIR1 SOT23-5 pH xxxx -40 °C to 125°C EUP7917-35VIR1 SOT23-5 pR xxxx -40 °C to 125°C EUP7917-48VIR1 SOT23-5 pK xxxx -40 °C to 125°C EUP7917VIR1 SOT23-5 pA xxxx -40 °C to 125°C Lead Free Code 1 : L e a d F r e e 0 : L e a d P a c k i n g R : T a p e & R e e l Operating temperature range I: Industry Standard Package Type N : S C - 7 0 V : S O T - 2 3 Output Voltage 185:1.85V 25:2.5V 28:2.8V 285:2.85V 29:2.9V 30:3.0V 3 3 : 3 . 3 V 3 5 : 3 . 5 V 4 8 : 4 . 8 V B l a n k : A d j u s t a b l e

DS7917 Ver1.2 Mar. 2008 Absolute Maximum Ratings „ ESD Rating Operating Ratings

Electrical Characteristics

Conditions: VIN=VOUT+0.5V or 2.5V whichever is greater,VEN=VIN,CIN=1uF,COUT=1uF,TA=-40~85℃ ,Unless otherwise specified. EUP7917 Symbol Parameter Conditions Min Typ Max. Unit Input V oltage 2.5 6 V IOUT=1mA,TA=25℃ -2 2 ∆VOUT Output V oltage Accuracy IOUT=1mA,TA=-40℃ to 85℃ -3.0 3.0 % IOUTMAX Maximum Output Current T A>0℃ 300 mA ILIMIT Current Limit V OUT=VOUT(nom)×90%, TA>0℃ 300 440 800 mA VOUT≧3V , IOUT=80mA 72 125 VOUT≧3V ,IOUT=300mA 250 350 2.4≦VOUT≦3V ,IOUT=80mA 80 135 VDROP Dropout V oltage (Note1) 2.4≦VOUT≦3V ,IOUT=300mA 300 400 mV IOUT=0.05mA 70 160 IQ Quiescent Current VIN=VOUT (nom)-0.1V ,IOUT=0mA 110 250 µA VLNR Line Regulation V IN=(VOUT+0.5V) to 6V , IOUT=0.1mA 0.02 0.25 %/V VLDR Load Regulation 1mA ≤IOUT ≤300mA 0.002 0.013 %/mA VEN=0,TA=25℃ 0.01 1 ISHDN Shutdown Supply Current VEN=0,TA=85℃ 0.05 µA VIN=(VOUT+1V)DC+0.5VP-P f=1kHz, ILOAD=10mA 75 VIN=(VOUT+1V)DC+0.5VP-P f=10kHz, ILOAD=10mA 60 PSRR Power Supply Ripple Rejection VIN=(VOUT+1V)DC+0.5VP-P f=100kHz, ILOAD=10mA 45 dB Fixed-V oltage 50 Output Noise V oltage (RMS) f=10Hz~100kHz, ILOAD=10mA Adjustable V oltage 239 µV Turn-on Time (Note2) R LOAD=50Ω,TA=25℃ 200 µs

DS7917 Ver1.2 Mar. 2008 Electrical Characteristics (continued) Conditions: VIN=VOUT+0.5V or 2.5V whichever is greater,VEN=VIN,CIN=1uF,COUT=1uF,TA=-40~85℃ ,Unless otherwise specified. VENL VENL (Maximum Low Level Input V oltage at EN) VIN=2.5V to 5.5V 0.4 V VENH VENH (Minimum high Level Input V oltage at EN) VIN=2.5V to 5.5V 1.5 V VEN Input Bias Current V IN=5.5V , VEN=0 or 5.5V 1 nA FB Input Bias Current (ADJ Version) VIN=5.5V , VFB=1.3V 1 nA VFB FB Pin V oltage (ADJ Version) TA=25℃ 1.176 1.2 1.224 V TSD Thermal Shutdown Temperature 155 ℃ ∆TSD Thermal Shutdown Hysteresis 15 ℃ Note 1: Dropout is defined as VIN-VOUT when VOUT is 100mV below the value of VOUT for VIN=VOUT+0.5V Note 2: Test time needed for VOUT to reach 90% of final value.

DS7917 Ver1.2 Mar. 2008 -40 -15 10 35 60 85 -0.8 -0.4 0.0 0.4 0.8 IOUT=1mA OUTPUT VOLTAGE ACCURACY vs. TEMPERATUREDEVIATION (%) Temperature ( o Typical Operating Characteristics 0 50 100 150 200 250 300 -0.6 -0.4 -0.2 0.0 0.2 0.4 0.6 OUTPUT VOLTAGE ACCURACY vs. lOAD CURRENT DEVIATION (%) LOAD CURRENT (mA) 0 50 100 150 200 250 300 120 160 200 240 VIN=5.5V VIN=3.3V GROUND CURRENT vs. LOAD CURRENT GROUND CURRENT (uA) LOAD CURRENT (mA) 0 50 100 150 200 250 300 100 150 200 250 300 350 TEMP=-40 TEMP=25 TEMP=85 DROPOUT VOLTAGE vs. LOAD CURRENT DROPOUT VOLTAGE (mV) LOAD CURRENT (mA) 0123456 120 160 200 240 IOUT=300mA IOUT=0mA GROUND CURRENT vs. INPUT VOLTAGE GROUND CURRENT (uA) INPUT VOLTAGE (V) 0123456 0.0 0.5 1.0 1.5 2.0 2.5 3.0 IOUT=300mA IOUT=0mA OUTPUT VOLTAGE vs. INPUT VOLTAGE OUTVOLTAGE (V) INPUTVOLTAGE (V)

DS7917 Ver1.2 Mar. 2008 - 4 0 - 2 00 2 04 06 08 0 1 0 0 1 2 0 1 4 0 100 120 GROUND CURRENT vs. TEMPERATURE GROUND CURRENT (uA) TEMPERATURE ( o

DS7917 Ver1.2 Mar. 2008

DS7917 Ver1.2 Mar. 2008 Application Note External Capacitors Like any low-dropout regulator, the EUP7917 requires external capacitors for regulator stability. The EUP7917 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 1 µF is required between the EUP7917 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 1µF over the entire operating temperature range. Output Capacitor The EUP7917 is designed sp ecifically to work with very small ceramic output capacitors. A ceramic capacitor (temperature characteristics X7R, X5R, Z5U, or Y5V) in 1 to 22 µF range with 5mΩ to 500mΩ ESR range is suitable in the EUP7917 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 (5mΩ to 500mΩ) No-Load Stability The EUP7917 will remain stable and in regulation with no external load. This is specially important in CMOS RAM keep-alive applications. Capacitor Characteristics The EUP7917 is designed to work with ceramic capacitors on the output to take advantage of the benefits they offer: for cap acitance values in the range of 1 µF to 4.7 µF 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 1 µF ceramic capacitor is in the range of 20m Ω to 40m Ω, which easily meets the ESR requirement for stability by the EUP7917. The ceramic capacitor’s capacitance can vary with temperature. The capacitor type X7R, which operates over a temperature range of -55°C to +125°C, will only vary the capacitance to within ±15%. Most large value ceramic capacitors ( ≈2.2µF) are manufactured with Z5U or Y5V temperature characteristics. Their capacitance can drop by more than 50% as the temperature goes from 25°C to 85°C. Therefore, X7R is recommended over Z5U and Y5V in applications where the ambient temperature will change significantly above or below 25°C. Noise Bypass Capacitor Connecting a 0.01 µF 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 EUP7917 has an output voltage range of 1.2V to 4.5V . The output voltage of the EUP7917 adjustable regulator is programmed using an external resistor divider as shown in Figure3. The output voltage is calculated using: Where: Vref= 1.2V typ. (the internal reference voltage) Utilize the following equation for adjusting the output to a particular voltage: Choose R2=50k to optimize accuracy, power supply rejection, noise and power consumption. Figure3. Adjustable Regulator with Resistors R (1VV refO +×=  −= 11.2V VRR O

DS7917 Ver1.2 Mar. 2008 On/Off Input Operation The EUP7917 is turned off by pulling the VEN pin low, and turned on by pulling it high. If this feature is not used, the V EN 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 V EN input must be able to swing above and below the specified turn-on/off voltage thresholds listed in the Electrical Characteristics section under V IL and VIH. Fast Start up The EUP7917 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. Thermal Considerations Thermal protection limits power dissipation in EUP7917.When the operation junction temperature exceeds 155°C, the OTP circuit starts the thermal shutdown function turn the pass element off. The pass element turn on again after the junction temperature cools by 15°C. For continue operation, do not exceed absolute maximum operation junction temperature 125°C. The power dissipation definition in device is : The maximum power dissipation depends on the thermal resistance of IC package, PCB layout, the rate of surroundings airflow and temperature difference between junction to ambient. The maximum power dissipation can be calculated by following formula : Where T J(MAX) is the maximum operation junction temperature 125°C, T A is the ambient temperature and the θJA is the junction to ambient thermal resistance. For recommended operating conditions specification of EUP7917, where T J(MAX) is the maximum junction temperature of the die (125°C) and T A is the maximum ambient temperature. The junction to ambient thermal resistance ( θ JA is layout dependent) only for SC-70 package is 330°C/W on stan dard thermal test board. The maximum power dissipation at T A = 25°C can be calculated by following formula : The maximum power dissipation depends on operating ambient temperature for fixed T J(MAX) and thermal resistance θJA. () QINOUTOUTIND IVIV-VP ×+×= ( ) JA AJ(MAX) (MAX)D T-TP θ= () )70SC(mW300330/C25C125P (MAX)D −=°−°=

DS7917 Ver1.2 Mar. 2008 Packaging Information SC-70 MILLIMETERS INCHES SYMBOLS MIN. MAX. MIN. MAX. A 0.80 1.10 0.031 0.044 A1 0.025 0.10 0.001 0.004 b 0.15 0.40 0.006 0.016 D 2.00 0.079 E 1.25 0.049 E1 1.90 2.30 0.075 0.091 e 0.65 0.026 L 0.21 0.46 0.008 0.018

DS7917 Ver1.2 Mar. 2008 SOT23-5 MILLIMETERS INCHES SYMBOL S MIN. MAX. MIN. MAX. A - 1.30 - 0.052 A1 0.00 0.15 0.000 0.006 D 2.90 0.114 E1 1.60 0.063 E 2.60 3.00 0.102 0.118 L 0.30 0.60 0.012 0.024 b 0.30 0.50 0.012 0.020 e 0.95 0.037