EUP7915 EUTECH | Alldatasheet

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Technical content

DS7915 Ver1.4 Apr. 2008 150mA Low-Noise LDO in SOT23-5

DESCRIPTION

The EUP7915 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 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 battery- powered 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. Block Diagram

FEATURES

z 2.5V to 5.5V Input Voltage Range z 50µV(rms) Output Noise z 140mV Dropout @ 150mA z 75dB PSRR at 1kHz z Low 70µA Ground Current z 150mA Output Current z Stability with 1µF Ceramic Output Capacitors z Excellent Load/Line Transient z Thermal Shutdown and Current Limit Protection 2.9V,3.0V,3.3V,4.8V 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. Fixed-Voltage

DS7915 Ver1.4 Apr. 2008 Pin Configurations Package Type Pin Configurations SOT23-5 F i x e d - V o l t a g e A d j u s t a b l e V o l t a g e Pin Description PIN PIN DESCRIPTION VIN 1 Input voltage of the LDO GND 2 Common ground VEN 3 Enable input logic, enable high BYPASS Optional bypass capacitor for noise reduction ADJ Adjustable regulator feedback input. Connect to resistor divider. VOUT 5 Output voltage of the LDO

DS7915 Ver1.4 Apr. 2008

Ordering Information

Order Number Package Type Marking Operating Temperature Range EUP7915-12VIR1 SOT23-5 ZT □ □ □ □ -40 °C to 125°C EUP7915-15VIR1 SOT23-5 ZC □ □ □ □ -40 °C to 125°C EUP7915-18VIR1 SOT23-5 ZD □ □ □ □ -40 °C to 125°C EUP7915-25VIR1 SOT23-5 ZB □ □ □ □ -40 °C to 125°C EUP7915-28VIR1 SOT23-5 ZE □ □ □ □ -40 °C to 125°C EUP7915-285VIR1 SOT23-5 ZF □ □ □ □ -40 °C to 125°C EUP7915-29VIR1 SOT23-5 ZW □ □ □ □ -40 °C to 125°C EUP7915-30VIR1 SOT23-5 ZG □ □ □ □ -40 °C to 125°C EUP7915-33VIR1 SOT23-5 ZH □ □ □ □ -40 °C to 125°C EUP7915-48VIR1 SOT23-5 ZK □ □ □ □ -40 °C to 125°C EUP7915VIR1 SOT23-5 ZA □ □ □ □ -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 V : S O T - 2 3 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 B l a n k : A d j u s t a b l e Absolute Maximum Ratings „ ESD Rating Operating Ratings

DS7915 Ver1.4 Apr. 2008

Electrical Characteristics

Conditions: VIN=VOUT+0.2V if VOUT≧2.5V , VIN=2.5V if VOUT<2.5V ,VEN=VIN, CIN=1uF, COUT=1uF,TA= -40~ 85℃ Unless otherwise specified. Typical values are at 25℃. EUP7915 Symbol Parameter Conditions Min Typ Max. Unit Input V oltage 2.5 5.5 V IOUT=1mA,TA=25℃ -2 2 % ∆VOUT Output V oltage Accuracy IOUT=1mA,TA=-40℃ to 85℃ -3 3 % IOUTMAX Maximum Output Current TA>0, VIN=VOUT + 0.2V for VOUT > 3.3V or VIN=VOUT +0.5V 150 mA ILIMIT Current Limit V OUT=VOUT(nom)×90%, TA>0℃ 160 220 400 mA IOUT=150mA, VOUT<3.3V 140 240 VDROP Dropout V oltage (Note1) IOUT=100mA, VOUT>3.3V 60 100 mV IQ Quiescent Current I OUT=1mA 70 160 µA VLNR Line Regulation VIN=(VOUT+0.2V) to 5.5V , IOUT=1mA 0.02 0.25 %/V VLDR Load Regulation 1mA ≤IOUT ≤100mA (VIN=VOUT + 0.2V) 1mA ≤IOUT ≤150mA (VIN=VOUT + 0.5V) 0.002 0.013 %/mA ISHDN Shutdown Supply Current V EN=0,TA=25℃ 1 µA PSRR Power Supply Ripple Rejection VIN=(VOUT+1V)DC+0.5VP-P f=1kHz, ILOAD=10mA 75 dB Output Noise V oltage (Bypass) f=10Hz~100kHz, ILOAD=10mA 50 µV Output Noise V oltage (ADJ) f=10Hz~100kHz, I LOAD=10mA 239 µV Turn-on Time (Note2) R LOAD=50Ω,TA=25℃ 200 µs 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: 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 0123456 120 160 200 IOUT=0mA IOUT=120mA 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=120mA IOUT=0mA OUTPUT VOLTAGE (V) INPUT VOLTAGE (V) OUTPUT VOLTAGE vs. INPUT VOLTAGE -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 0 2 04 06 08 0 1 0 0 1 2 0 -0.4 -0.2 0.0 0.2 0.4 OUTPUT VOLTAGE ACCURACY vs. LOAD CURRENTDEVIATION (%) LOAD CURRENT (mA) 0 2 04 06 08 0 1 0 0 1 2 0 120 160 200 GROUND CURRENT vs. LOAD CURRENT Vin=5.5V GROUND CURRENT (uA) LOAD CURRENT (mA) Vin=3.3V Typical Operating Characteristics 0 2 04 06 08 0 1 0 0 1 2 0 120 (VOUT=2.5V, Dropout Voltage=VIN-VOUT) Temp=-40 o C Temp=85 o C Temp=25 o C DROPOUT VOLTAGE vs. LOAD CURRENT DROPOUT VOLTAGE (mV) LOAD CURRENT (mA)

DS7915 Ver1.4 Apr. 2008 -40 -20 0 20 40 60 80 100 120 140 100 120 GROUND CURRENT vs. TEMPERATURE GROUND CURRENT (uA) TEMPERATURE ( o

DS7915 Ver1.4 Apr. 2008

DS7915 Ver1.4 Apr. 2008 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 1 µF 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 1µF over the entire operating temperature range. Output Capacitor The EUP7915 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 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 (5mΩ to 500mΩ) 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 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 EUP7915. 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 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: 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. Figure5. Adjustable Regulator with Resistors R (1VV refO +×=  −= 11.2V VRR O

DS7915 Ver1.4 Apr. 2008 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 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 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 Packaging Information SOT23-5 MILLIMETERS INCHES SYMBOLS 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