EUP7967A 300mA Low-Noise Low-Dropout Linear Regulator DESCRIPTION FEATURE z z z z z z z z z z The EUP7967A low-noise, low-dropout, linear regulator operates from a 2.5V to 5.5V input and is guaranteed to deliver 300mA. The EUP7967A is stable with small 2.2µF ceramic capacitor. Its performance suits battery powered applications because of its shutdown mode, low quiescent current, and very low dropout voltage. The low dropout voltage allows for more utilization of a battery’s available energy by operating closer to its end-of-life voltage. APPLICATIONS The EUP7967A is available in 1.5V,1.8V,2.5V, 2.8V, 3V ,3.3V and Adjustable versions. z z z z Block Diagram Figure1. DS7967A Ver 1.4 Sep. 2007 300mA Guaranteed Output Current 65dB PSRR at 1kHz Low Noise Output 150mV Dropout at 300mA Load Low 84µA No-Load Supply Current ≤ 1µA Shutdown Current Stable With 2.2µF Ceramic Output Capacitors Thermal Shutdown and Short-Circuit Protection SOT23-5 Package RoHS Compliant and 100% Lead (Pb)-Free 1 Wireless Handsets DSP Core Power Battery Powered Electronics Portable Information Appliance EUP7967A Typical Application Circuit Figure2. Fixed-Voltage LDO Regulator Pin Configurations Package Type Pin Configurations SOT23-5 Fixed-Voltage Adjustable Voltage Pin Description PIN NAME 1 VIN 2 GND Common Ground 3 SHDN SHDN places the entire device in shutdown mode when held low 4 5 DS7967A Ver 1.4 BP DESCRIPTION Input voltage of the LDO Compensation capacitor for noise reduction ADJ Adjustable regulator feedback input. Connect to resistor divider. VOUT Output voltage of the LDO Sep. 2007 2 EUP7967A Ordering Information Order Number Package Type Marking Operating Temperature range EUP7967A-12VIR1 SOT23-5 hT □ □ □ □ -40°C to 85°C EUP7967A-15VIR1 SOT23-5 h0 □ □ □ □ -40°C to 85°C EUP7967A-18VIR1 SOT23-5 h1 □ □ □ □ -40°C to 85°C EUP7967A-25VIR1 SOT23-5 h2 □ □ □ □ -40°C to 85°C EUP7967A-28VIR1 SOT23-5 h6 □ □ □ □ -40°C to 85°C EUP7967A-30VIR1 SOT23-5 h5 □ □ □ □ -40°C to 85°C EUP7967A-33VIR1 SOT23-5 h3 □ □ □ □ -40°C to 85°C EUP7967AVIR1 SOT23-5 hA □ □ □ □ -40°C to 85°C EUP7967A □ □ □ □ □ □ Lead Free Code 1: Lead Free 0: Lead Packing R: Tape & Reel Operating temperature range I: Industry Standard C: Commercial Package Type V: SOT23 Output Voltage 12: 1.2V 15: 1.5V 18: 1.8V 25: 2.5V 28: 2.8V 30: 3.0V 33: 3.3V Black: Adjustable DS7967A Ver 1.4 Sep. 2007 3 EUP7967A Absolute Maximum Ratings VIN,VEN --------------------------------------------------------------------------------- -0.3 to 6V VOUT ------------------------------------------------------------------- -0.3 to (VIN+0.3) ≤ 6V Junction Temperature ------------------------------------------------------------------- 150°C Storage Temperature ------------------------------------------------------ -65°C to +150°C Lead Temp -----------------------------------------------------------------------------235°C Pad Temp ------------------------------------------------------------------------------235°C Maximum Power Dissipation SOT23-5 -------------------------------------------- 364mW Thermal Resistance θJA(SOT23-5) ------------------------------------------------- 220°C/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 -------------------------------------------------------- -40°C to +125°C Electrical Characteristics Unless otherwise specified, all limits guaranteed for VIN= VO +0.5V, VSHDN=VIN, CIN=COUT=2.2µF, CBP=10nF, TA =25°C. Symbol Parameter ∆ VO Output Voltage Tolerance IO ILIMIT Maximum Output Current Output Current Limit Supply Current Shutdown Supply Current IQ VDO ∆ VO Dropout Voltage Line Regulation Load Regulation en Output Voltage Noise Conditions 100µA ≤ IOUT ≤ 300mA VIN=VO+0.5V, Continuous TA = -40°C to 85°C IOUT=0mA VO =0V, SHDN =GND IOUT =300mA IOUT = 1mA, (VO +0.5V) ≤ VI ≤ 5.5V 1mA ≤ IOUT ≤ 300mA IOUT =10mA, 10Hz ≤ f ≤ 100kHz VIH,(VO+0.5V) ≤ VI ≤ 5.5V Min EUP7967A Typ Max. -3 300 350 +3 140 1 150 200 mV 0.05 0.2 %/V 15 35 mV SHDN Input Threshold ISHDN VFB SHDN Input Bias Current FB Input Bias Current (ADJ Version) FB Pin Voltage (ADJ Version) TSD Thermal Shutdown Temperature 160 Thermal Shutdown Hysteresis 20 PSRR Power Supply Rejection Ratio DS7967A Ver 1.4 Sep. 2007 VIL,(VO+0.5V) ≤ VI ≤ 5.5V TA=25℃ 0.4 0.1 4 100 1 1.176 VIN=VOUT+1V, f=1kHZ µVRMS 1.6 VSHDN VIN=5.5V, VFB=1.3V % of VOUT(NOM) mA mA µA µA 720 84 50 SHDN =GND or IN Unit 1.2 65 V nA nA 1.224 V °C dB EUP7967A Typical Operating Characteristics Output Voltage vs. Input voltage o Output Voltage vs. Temperature( C) 3.06 Output Voltage (V) Output Voltage VOUT(V) 3.020 3.015 ILOAD=1mA 3.010 3.04 o 25 C 3.02 3.00 o o -40 C 125 C 2.98 3.005 2.96 3.000 -60 -40 -20 0 20 40 60 2.94 3.5 80 100 120 140 4.0 Quiescent Current vs. Temperature Dropout Voltage (mV) Quiescent Current (uA) 110 100 90 80 70 60 0 20 40 60 80 100 120 140 Temperature ( C) Sep. 2007 240 220 200 180 160 140 120 100 80 60 40 20 0 -20 5.5 6.0 o 125 C o -40 C 50 100 150 200 Output Current (mA) 5 o 25 C 0 o DS7967A Ver 1.4 5.0 Dropout Voltage vs. Output Current 120 50 -60 -40 -20 4.5 Input Voltage (V) o Temperature( C) 250 300 EUP7967A DS7967A Ver 1.4 Sep. 2007 6 EUP7967A Application Information Noise Bypass Capacitor An external 10nF bypass capacitor at BP pin conjunction with an internal resistor creates lowpass filter. Increasing the capacitance will decrease the output noise. 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. However, it does affect start-up time. The smaller the capacitance value, the quicker the start-up time. External Capacitors Like any low-dropout regulator, the EUP7967A requires external capacitors for regulator stability. The EUP7967A is specifically designed for portable applications requiring minimum board space and smallest components. These capacitors must be correctly selected for good performance. Input Capacitor A minimum input capacitance of 1µF is required between the EUP7967A 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. Power Dissipation and Junction Temperature Specified regulator operation is assured to a junction temperature of 125°C; the maximum junction temperature should be restricted to 125°C under normal operating conditions. This restriction limits the power dissipation the regulator can handle in any given application. To ensure the junction temperature is within acceptable limits, calculate the maximum allowable dissipation, PD(max), and the actual dissipation, PD, which must be less than or equal to PD(max) The maximum-power-dissipation limit is determined using the following equation: No-Load Stability The EUP7967A will remain stable and in regulation with no external load. This is specially important in CMOS RAM keep-alive applications. Output Capacitance The EUP7967A is specifically designed to employ ceramic output capacitors as low as 2.2µF. Ceramic capacitors below 10µF offer significant cost and space savings, along with high frequency noise filtering. Higher values and other types and of capacitor may be used, but their equivalent series resistance (ESR) should be maintained below 0.5Ω. Ceramic capacitor of the value required by the EUP7967A are available in the following dielectric types: Z5U, Y5V, X5R, and X7R. The Z5U and Y5V types exhibit a 50% or more drop in capacitance value as their temperature increase from 25°C, an important consideration. The X5R generally maintain their capacitance value within ± 20%. The X7R type are desirable for their tighter tolerance of 10% over temperature. T max − T A = J D(max) R P θJA Where: TJMAX is the maximum allowable junction temperature. RθJA is the thermal resistance junction-to-ambient for the package TA is the ambient temperature. The regulator dissipation is calculated using: ( ) PD = VI − VO × I O Power dissipation resulting from quiescent current is negligible. Excessive power dissipation triggers the thermal protection circuit. Shutdown The EUP7967A goes into sleep mode when the SHDN pin is in a logic low condition. During this condition, the pass transistor, error amplifier, and bandgap are turned off, reducing the supply current to 60nA typical. The SHDN pin may be directly tied to VIN to keep the part on. DS7967A Ver 1.4 Sep. 2007 7 EUP7967A Adjustable Operation The adjustable version of the EUP7967A has an output voltage range of 1.2V to 4.5V. The output voltage of the EUP7967A adjustable regulator is programmed using an external resistor divider as shown in Figure3. The output voltage is calculated using: V =V O ref × (1 + R1 R ) 2 Where: Vref= 1.2V typ. (the internal reference voltage) Utilize the following equation for adjusting the output to a particular voltage: V R = R 2 O − 1 1 1.2V Choose R2=50k to optimize accuracy, power supply rejection, noise and power consumption. Figure3. Adjustable Regulator with Resistors DS7967A Ver 1.4 Sep. 2007 8 EUP7967A Packaging Information SOT23-5 SYMBOLS A A1 D E1 E L b e DS7967A Ver 1.4 Sep. 2007 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 9 INCHES MIN. 0.000 MAX. 0.052 0.006 0.114 0.063 0.102 0.012 0.012 0.118 0.024 0.020 0.037