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EUP7965 150mA Low-Noise Low-Dropout Linear Regulator
DESCRIPTION
The EUP7965 is designed for portable and wireless applications with demanding performance and space requirements. The EUP7965 is stable with a small 1F 30% ceramic output capacitor. The EUP7965's performance is optimized for battery powered systems to deliver low noise, low dropout voltage, low quiescent current and excellent line and load transient response. An optional external bypass capacitor reduces the output noise further without slowing down the load transient response. Power supply rejection is better than 65dB at low frequencies. High power supply rejection is maintained down to low input voltage levels common to battery operated circuits. Other features include a logic-controlled shutdown mode, short-circuit and thermal-shutdown protection. The EUP7965 is available in a SOT23-5,SOT23-6 package.
FEATURES
2.5 to 5.5V Input Range 150mA Guaranteed Output 70dB PSRR at 1kHz @ VIN=VOUT+1V 50Vrms Output Noise (typ) over 10Hz to 100kHz 100mV Maximum Dropout with 150mA Load Low 85A No-load Supply Current 1.5A Shutdown Current Fast Start-up time. Stable with 1F Ceramic Capacitors Thermal Shutdown and Short-circuit Protection Preset Output Voltage 1.5V, 1.8V, 2.5V, 2.8V, 2.85V, 3.0V ,3.3V, 4.8V ,5.0V and adjustable SOT23-5,SOT23-6 package RoHS Compliant and 100% Lead (Pb)-Free
APPLICATIONS
Cellular and Cordless Handsets Bluetooth, Wireless LAN PDAs and Palmtop Computers Portable Information Appliances
Block Diagram
Figure 1.
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Typical Application Circuit
Figure 2.
Figure 3.
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Pin Configurations
Part Number Pin Configurations
EUP7965 SOT23-5
EUP7965 SOT23-6
Pin Description
PIN VIN GND VEN BYPASS SET VOUT 5 SOT23-5 1 2 3 4 SOT23-6 1 2 3 4 5 6 Input voltage of the LDO Common ground Enable input logic, enable high Optional bypass capacitor for noise reduction Output voltage set. Not externally connected for the fixed versions. Connect to resistor-divider for adjustable output voltage. Output voltage of the LDO DESCRIPTION
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Ordering Information
Order Number EUP7965-15VIR1 EUP7965-18VIR1 EUP7965-25VIR1 EUP7965-28VIR1 EUP7965-285VIR1 EUP7965-30VIR1 EUP7965-33VIR1 EUP7965-48VIR1 EUP7965-50VIR1 EUP7965VIR1 Package Type SOT23-5 SOT23-5 SOT23-5 SOT23-5 SOT23-5 SOT23-5 SOT23-5 SOT23-5 SOT23-5 SOT23-6 Marking G0 1/4
1/4 1/4 1/4 1/4 1/4 1/4 1/4 1/4 1/4 1/4
Operating Temperature range -40 C to 85C -40 C to 85C -40 C to 85C -40 C to 85C -40 C to 85C -40 C to 85C -40 C to 85C -40 C to 85C -40 C to 85C -40 C to 85C
G1 1/4 G2 1/4 G6 1/4 G8 1/4 G5 1/4 G3 1/4 G7 1/4 G4 1/4 GA 1/4
EUP7965-1/4
1/4
1/4
1/4
1/4
1/4
1/4
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 15: 1.5V 18: 1.8V 25: 2.5V 28: 2.8V 285: 2.85V 30: 3.0V 33: 3.3V 48: 4.8V 50: 5.0V Blank: Adjustable
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Absolute Maximum Ratings
VIN,VEN ------------------------------------------------------------------------------- -0.3 to 6V VOUT ----------------------------------------------------------------- -0.3 to (VIN+0.3) 6V Junction Temperature ------------------------------------------------------------------- 150C Storage Temperature ------------------------------------------------------ -65C to +150C Lead Temp -----------------------------------------------------------------------------235C Pad Temp ------------------------------------------------------------------------------235C Maximum Power Dissipation SOT23-5 --------------------------------------------- 364mW Thermal Resistance JA(SOT23-5) --------------------------------------------------- 220C/W ESD Rating Human Body Model ------------------------------------------------------------------- 2kV
Operating Ratings
VIN -------------------------------------------------------------------------------------- 2.5 to 5.5V VEN ------------------------------------------------------------------------- 0 to (VIN+0.3) 5.5V Junction Temperature ------------------------------------------------------ -40C to +125C
Electrical Characteristics
Unless otherwise specified, all limits guaranteed for VIN= VOUT(nom) +0.5V, CIN=1F, IOUT=1mA, COUT=1F, CBYPASS=0.01F. Typical values and limits appearing in standard typeface are for TJ= 25C.
Symbol
Parameter
Output Voltage Tolerance
Conditions
IOUT = 1mA VIN = (VOUT(nom)+0.5V) to 5.5V, For 4.8 to 5.0 options For all other options IOUT = 1mA to 150mA VIN=VOUT(nom)+1V, f = 1kHz, IOUT=50mA*6 VEN=1.4V, IOUT = 0mA For 4.8 to 5.0 options For all other options VEN = 1.4V, IOUT = 0 to 150mA For 4.8 to 5.0 options For all other options VEN = 0.4V IOUT = 1mA IOUT = 50mA IOUT = 100mA IOUT = 150mA
EUP7965 Min Typ Max.
-2 -0.19 -0.1 0.0025 70 100 85 155 140 0.06 0.5 25 50 75 165 150 250 200 1.5 2 35 70 100 2 0.19 0.1 0.005
Unit
% of VOUT(nom) %/V %mA dB
G VOUT
Line Regulation Error Load Regulation Error
PSRR
Power Supply Rejection Ratio
IQ
Quiescent Current
A
Dropout Voltage
mV
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Electrical Characteristics
Unless otherwise specified, all limits guaranteed for VIN= VOUT(nom) +0.5V, CIN=1F, IOUT=1mA, COUT=1F, CBYPASS=0.01F. Typical values and limits appearing in standard typeface are for TJ= 25C.
Symbol
ISC TON en IEN VIL VIH
Parameter
Short Circuit Current Limit Turn-On Time Output Noise Voltage Maximum Input Current at EN Maximum Low Level Input Voltage at EN Minimum High Level Input Voltage at EN Thermal Shutdown Temperature Thermal Shutdown Hysteresis
Conditions
Output Grounded (Steady State) CBYPASS = 0.01F BW = 10Hz to 100kHz, COUT = 1F VEN = 0.4 and VIN = 5.5 VIN = 2.5 to 5.5V VIN = 2.5 to 5.5V
Min
EUP7965 Typ Max.
600 150 50 1 0.4
Unit
mA s Vrms nA V V
1.4 160 20
C C
TSD
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Unless otherwise specified, CIN=CCOUT=1F Ceramic, CBYPASS=10nF, VIN=VOUT+0.2V, TA=25C, Enable pin is tied to VIN.
Typical Operating Characteristics
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Application Note
External Capacitors Like any low-dropout regulator, the EUP7965 requires external capacitors for regulator stability. The EUP7965 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 EUP7965 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 EUP7965 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 EUP7965 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 EUP7965 will remain stable and in regulation with no external load. This is specially important in CMOS RAM keep-alive applications. Capacitor Characteristics The EUP7965 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 EUP7965. 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 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. On/Off Input Operation The EUP7965 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 EUP7965 output starts up after Vref voltage reaches its final value (1.23V 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.
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Adjustable Operation The adjustable version of the EUP7965 has an output voltage range of 1.25V to 5V. The output voltage of the EUP7965 adjustable regulator is programmed using an external resistor divider as shown in Figure3. The output voltage is calculated using:
VO = Vref x (1 + R1 ) R2
Where: Vref=1.23V typ. (the internal reference voltage) Utilize the following equation for adjusting the output to a particular voltage: V PI = R O - 1 2 1.23V Choose R2=100k to optimize accuracy, power supply rejection, noise and power consumption. In order to improve the stability of the adjustable version, it is suggested that a small compensation capacitor C1 be placed between VOUT and SET .
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Packaging Information
SOT23-5
Note: 1. Package body sizes exclude mold flash protrusions or gate burrs. 2. Tolerance 0.1000mm (4 mil) unless otherwise specified. 3. Coplanarity: 0.1000mm 4. Dimension L is measured in gage plane.
Symbols A A1 A2 b C D E e H L c1
Min. 1.00 0.00 0.70 0.35 0.12 2.70 1.50 ----2.6 0.37 14
Dimension in Millimeters Nom 1.10 ----0.80 0.40 0.15 2.90 1.60 1.90(Typ.) 2.8 ----5
Max. 1.30 0.10 0.90 0.50 0.20 3.10 1.70 ----3.00 ----9
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SOT23-6
SYMBOLS A A1 A2 b C D E E1 e E1 L L1 L2 R R1
c c
1
DIMENSIONS IN MILLIMETERS MIN. NOM. --------------------0.90 1.15 0.30 -----0.08 -----2.90 BSC 2.80 BSC 1.60 BSC 0.95 BSC 1.90 BSC 0.30 0.45 0.60 REF 0.25 BSC 0.10 -----0.10 -----0 4 5 10
MAX. 1.45 0.15 1.30 0.50 0.22
0.60
-----0.25 8 15
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