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EUP7917
300mA, High PSRR Low-Noise LDO
DESCRIPTION
The EUP7917 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 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 batterypowered 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.
FEATURES
Space-Saving 5-pin SC-70 Package 2.5V to 6V Input Voltage Range 50V(rms) Output Noise 250mV Dropout @ 300mA 75dB PSRR at 1kHz Low 70A Ground Current Up to 300mA Output Current Stability with 1F Ceramic Output Capacitors Excellent Load/Line Transient Thermal Shutdown and Current Limit Protection Available in 1.2V,1.3V,1.5V,1.8V,1.85V, 2.5V,2.8V,2.85V, 2.9V,3.0V,3.3V,3.5V,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.
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EUP7917
Typical Application Circuit
Figure 2. Fixed-Voltage LDO Regulator
Pin Configurations
Package Type Pin Configurations
SC-70 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
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Ordering Information
Order Number Package Type Marking Operating Temperature range
EUP7917-12NIR1 EUP7917-13NIR1 EUP7917-15NIR1 EUP7917-18NIR1 EUP7917-185NIR1 EUP7917-25NIR1 EUP7917-28NIR1 EUP7917-285NIR1 EUP7917-29NIR1 EUP7917-30NIR1 EUP7917-33NIR1 EUP7917-35NIR1 EUP7917-48NIR1 EUP7917NIR1 EUP7917-12VIR1 EUP7917-13VIR1 EUP7917-15VIR1 EUP7917-18VIR1 EUP7917-185VIR1 EUP7917-25VIR1 EUP7917-28VIR1 EUP7917-285VIR1 EUP7917-29VIR1 EUP7917-30VIR1 EUP7917-33VIR1 EUP7917-35VIR1 EUP7917-48VIR1 EUP7917VIR1 EUP7917- 1/4
1/4 1/4 1/4
SC-70 SC-70 SC-70 SC-70 SC-70 SC-70 SC-70 SC-70 SC-70 SC-70 SC-70 SC-70 SC-70 SC-70 SOT23-5 SOT23-5 SOT23-5 SOT23-5 SOT23-5 SOT23-5 SOT23-5 SOT23-5 SOT23-5 SOT23-5 SOT23-5 SOT23-5 SOT23-5 SOT23-5
1/4
pT xx pX xx pC xx pD xx pU xx pB xx pE xx pF xx pW xx pG xx pH xx pR xx pK xx pA xx pT xxxx pX xxxx pC xxxx pD xxxx pU xxxx pB xxxx pE xxxx pF xxxx pW xxxx pG xxxx pH xxxx pR xxxx pK xxxx pA xxxx Lead Free Code 1: Lead Free 0: Lead Packing R: Tape & Reel Operating temperature range I: Industry Standard Package Type N: SC-70 V: SOT-23 Output Voltage 12:1.2V 13:1.3V 185:1.85V 25:2.5V 285:2.85V 29:2.9V 33:3.3V 35:3.5V
-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 -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 -40 C to 125C -40 C to 125C -40 C to 125C -40 C to 125C -40 C to 125C -40 C to 125C
15:1.5V 18:1.8V 28:2.8V 30:3.0V 48:4.8V Blank: Adjustable
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Absolute Maximum Ratings
VIN,VEN ------------------------------------------------------------------------------- -0.3 to 6.5V VOUT ----------------------------------------------------------------------------- -0.3 to (VIN+0.3) Junction Temperature --------------------------------------------------------------------- 150C Storage Temperature Range ---------------------------------------------------- -65C to +150C Lead Temperature -------------------------------------------------------------------------- 260C Thermal Resistance JA(SC-70) --------------------------------------------------------- 330C/W Thermal Resistance JA(SOT23-5) ------------------------------------------------------ 220C/W ESD Rating Human Body Model ---------------------------------------------------------------------- 2kV
Operating Ratings
VIN --------------------------------------------------------------------------------------- 2.5 to 6V VEN ----------------------------------------------------------------------------------- 0 to (VIN+0.3) Operating Temperature Range ------------------------------------------------- -40C to +125C
Electrical Characteristics
Conditions: VIN=VOUT+0.5V or 2.5V whichever is greater,VEN=VIN,CIN=1uF,COUT=1uF,TA=-40~85J ,Unless otherwise specified.
Symbol
Parameter
Input Voltage
Conditions
IOUT=1mA,TA=25J IOUT=1mA,TA=-40J to 85J TA>0J VOUT=VOUT(nom) x 90%, TA>0J VOUTU 3V, IOUT=80mA VOUTU 3V ,IOUT=300mA 2.4O 2.4O VOUTO 3V,IOUT=80mA VOUTO 3V,IOUT=300mA
Min
2.5 -2 -3.0 300 300
EUP7917 Typ Max.
6 2 3.0 440 72 250 80 300 70 110 0.02 0.002 0.01 0.05 75 60 45 50 239 200 800 125 350 135 400 160 250 0.25 0.013 1
Unit
V % mA mA
VOUT
Output Voltage Accuracy
IOUTMAX Maximum Output Current ILIMIT Current Limit
VDROP
Dropout Voltage (Note1)
mV
IQ VLNR VLDR ISHDN
Quiescent Current Line Regulation Load Regulation Shutdown Supply Current
IOUT=0.05mA VIN=VOUT (nom)-0.1V,IOUT=0mA VIN=(VOUT+0.5V) to 6V, IOUT=0.1mA 1mA IOUT 300mA VEN=0,TA=25J
A %/V %/mA A
PSRR
VEN=0,TA=85J VIN=(VOUT+1V)DC+0.5VP-P f=1kHz, ILOAD=10mA Power Supply Ripple VIN=(VOUT+1V)DC+0.5VP-P f=10kHz, Rejection ILOAD=10mA VIN=(VOUT+1V)DC+0.5VP-P f=100kHz, ILOAD=10mA f=10Hz~100kHz, Fixed-Voltage Output Noise Voltage (RMS) ILOAD=10mA Adjustable Voltage Turn-on Time (Note2) RLOAD=50,TA=25J
dB
V s
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Electrical Characteristics (continued)
EUP7917
Conditions: VIN=VOUT+0.5V or 2.5V whichever is greater,VEN=VIN,CIN=1uF,COUT=1uF,TA=-40~85J ,Unless otherwise specified. VENL (Maximum Low Level VENL 0.4 VIN=2.5V to 5.5V Input Voltage at EN) VENH (Minimum high Level VENH 1.5 VIN=2.5V to 5.5V Input Voltage at EN) VEN Input Bias Current VIN=5.5V, VEN=0 or 5.5V 1 FB Input Bias Current (ADJ 1 VIN=5.5V, VFB=1.3V Version) FB Pin Voltage (ADJ VFB 1.176 1.2 1.224 TA=25J Version) Thermal Shutdown TSD 155 Temperature Thermal Shutdown TSD 15 Hysteresis 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.
V V nA nA V J J
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Typical Operating Characteristics
OUTPUT VOLTAGE vs. INPUT VOLTAGE
3.0 2.5 OUTVOLTAGE (V) 2.0 1.5 1.0 0.5 0.0 0 1 2 3 4 5 6 INPUTVOLTAGE (V) IOUT=300mA IOUT=0mA
DEVIATION (%)
OUTPUT VOLTAGE ACCURACY vs. lOAD CURRENT
0.6 0.4 0.2 0.0 -0.2 -0.4 -0.6 0 50 100 150 200 LOAD CURRENT (mA) 250 300
OUTPUT VOLTAGE ACCURACY vs. TEMPERATURE
0.8
DROPOUT VOLTAGE vs. LOAD CURRENT
350 DROPOUT VOLTAGE (mV) 300 TEMP=85 250 TEMP=25 200 150 100 50 0 0 50 100 150 200 250 300 TEMP=-40
DEVIATION (%)
0.4
IOUT=1mA
0.0
-0.4
-0.8 -40
-15
10
35
o
60
85
LOAD CURRENT (mA)
Temperature ( C)
GROUND CURRENT vs. INPUT VOLTAGE
240 GROUND CURRENT (uA)
GROUND CURRENT vs. LOAD CURRENT
240 GROUND CURRENT (uA)
200 160 120 80 40 0 0 1 2
IOUT=300mA
200 VIN=5.5V 160 120 80 40 0 VIN=3.3V
IOUT=0mA
3
4
5
6
0
50
100
150
200
250
300
INPUT VOLTAGE (V)
LOAD CURRENT (mA)
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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
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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 1F 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 1F over the entire operating temperature range. Output Capacitor The EUP7917 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 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 (5m to 500m) 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 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 EUP7917. 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
DS7917 Ver1.2 Mar. 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 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:
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.
Figure3. Adjustable Regulator with Resistors
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EUP7917
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 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 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 155C, 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 15C. For continue operation, do not exceed absolute maximum operation junction temperature 125C. The power dissipation definition in device is :
PD = (VIN - VOUT ) x I OUT + VIN x I Q
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 :
PD (MAX) =
(TJ(MAX) - TA )
JA
Where TJ(MAX) is the maximum operation junction temperature 125C, TA is the ambient temperature and the JA is the junction to ambient thermal resistance. For recommended operating conditions specification of EUP7917, where TJ(MAX) is the maximum junction temperature of the die (125C) and TA is the maximum ambient temperature. The junction to ambient thermal resistance (JA is layout dependent) only for SC-70 package is 330C/W on standard thermal test board. The maximum power dissipation at TA = 25C can be calculated by following formula :
PD (MAX) = (125C - 25C ) / 330 = 300 mW (SC - 70)
The maximum power dissipation depends on operating ambient temperature for fixed TJ(MAX) and thermal resistance JA.
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Packaging Information
SC-70
SYMBOLS A A1 b D E E1 e L
MILLIMETERS MIN. MAX. 0.80 1.10 0.025 0.10 0.15 0.40 2.00 1.25 1.90 2.30 0.65 0.21 0.46
INCHES MIN. 0.031 0.001 0.006 0.079 0.049 0.075 0.026 0.008 0.018 0.091 MAX. 0.044 0.004 0.016
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SOT23-5
SYMBOL S A A1 D E1 E L b e
MILLIMETERS MIN. MAX. 1.30 0.00 0.15 2.90 1.60 2.60 3.00 0.30 0.60 0.30 0.50 0.95
INCHES MIN. 0.000 0.114 0.063 0.102 0.012 0.012 0.037 0.118 0.024 0.020 MAX. 0.052 0.006
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