EUP7982 300mA Low-Noise Ultra Low-Dropout CMOS Regulator with Fault Indicator FEATURE DESCRIPTION z z z z The EUP7982 low-noise, low-dropout, linear regulator operates from a 2.5V to 5.5V input and is guaranteed to deliver 300mA. The EUP7982 is stable with small 2.2µF ceramic capacitor. Its performance suits battery powered applications because of its shutdown mode (60 nA typ), low quiescent current (110µA typ), and LDO voltage (140mV typ). The low dropout voltage allows for more utilization of a battery’s available energy by operating closer to its end-of-life voltage. An output fault-detection circuit indicates loss of regulation. The EUP7982 is available in MSOP package with 1.8V, 2.5v, 2.8V, 3V, 3.3V, and adjustable versions. z z z z z z z z APPLICATIONS z z z z Block Diagram Figure1. DS7982 Ver 1.4 May.2005 2.5V to 5.5V Input Range 300mA Guaranteed Output Current 60dB PSRR at 1kHz 50µV RMS Output Voltage Noise (10Hz to 100kHz) 140mV Dropout at 300mA Low 110µA No-Load Supply Current ≤ 1µA Shutdown Current Fast Start-up Time Stable With 2.2µF Ceramic Output Capacitors Thermal Shutdown and Short-Circuit Protection Fault Indicator RoHS Compliant and 100% Lead (Pb)-Free 1 Wireless Handsets DSP Core Power Battery Powered Electronics Portable Information Appliances EUP7982 Typical Application Circuit Figure2. Fixed Voltage LDO Regulator DS7982 Ver 1.4 May.2005 2 EUP7982 Pin Configurations Part Number Pin Configurations EUP7982 MSOP-8 Pin Description PIN PIN OUT 1,4 IN 2 Input voltage of the LDO GND 3 SET 5 CC 6 Common Ground Output voltage set. Not externally connected for the fixed versions. Connect ot resistor-divider for adjustable output voltage. Compensation capacitor for noise reduction SHDN 7 FAULT 8 DS7982 Ver 1.4 May.2005 DESCRIPTION Output voltage of the LDO SHDN places the entire device in shutdown mode when held low. Fault output. A high-impedance, open-drain output. If the circuit is out of regulation, FAULT goes low. In shutdown, this pin is high Impedance. Connect to GND if unused 3 EUP7982 Ordering Information Order Number Package Type Marking Operating Temperature range EUP7982MIR1 EUP7982MIR0 MSOP-8 CA □ □ P7982 -40°C to 85°C EUP7982-18MIR1 EUP7982-18MIR0 MSOP-8 C1 □ □ P7982 -40°C to 85°C EUP7982-25MIR1 EUP7982-25MIR0 MSOP-8 C2 □ □ P7982 -40°C to 85°C EUP7982-28MIR1 EUP7982-28MIR0 MSOP-8 C6 □ □ P7982 -40°C to 85°C EUP7982-30MIR1 EUP7982-30MIR0 MSOP-8 C5 □ □ P7982 -40°C to 85°C EUP7982-33MIR1 EUP7982-33MIR0 MSOP-8 C3 □ □ P7982 -40°C to 85°C EUP7982 □ □ □ □ □ □ Lead Free Code 1: Lead Free 0: Lead Packing R: Tape & Reel Operating temperature range I: Industry Standard C: Commercial Package Type M: MSOP Output Voltage 18: 1.8V 25: 2.5V 28: 2.8V 30: 3.0V 33: 3.3V Blank: Adjustable DS7982 Ver 1.4 May.2005 4 EUP7982 Absolute Maximum Ratings VIN, VOUT, V SHDN , VSET , VCC, V FAULT --------------------------------------------- -0.3V to 6V Fault Sink Current --------------------------------------------------------------------------------20mA Storage Temperature Range ------------------------------------------------------------- -65°C to 160°C Junction Temperature (TJ) -----------------------------------------------------------------------150°C Lead Temperature (10 sec.) ------------------------------------------------------------------------260°C Electrical Characteristics Unless otherwise specified, all limits guaranteed for VIN= VO +0.5V, VSHDN=VIN, CIN=COUT=2.2µF, CCC=22nF, TJ =25°C. (Boldface limits apply for the operating temperature extremes: -40°C and 85°C) Symbol Parameter VIN Input Voltage ∆ VO Output Voltage Tolerance VO IO Output Adjust Range Maximum Output Current Output Current Limit ILIMIT IQ Supply Current Shutdown Supply Current VDO ∆ VO Dropout Voltage Line Regulation Load Regulation en Output Voltage Noise Conditions 100µA ≤ IOUT ≤ 300mA VIN=VO+0.5V, SET= OUT for the Adjust Versions Adjust Version Only Average DC Current Rating EUP7982 Min Typ Max. Unit V 2.5 -2 5.5 +2 -3 +3 1.25 300 5.5 V mA mA 200 µA 1 µA 200 mV 0.1 %/V 600 110 240 0.06 IOUT=0mA IOUT=300mA VO =0V, SHDN =GND IOUT =1mA % of VOUT(NOM) 0.4 IOUT =200mA 90 IOUT =300mA IOUT = 1mA, (VO +0.5V) ≤ VI ≤ 5.5V 100µA ≤ IOUT ≤ 300mA IOUT =10mA, 10Hz ≤ f ≤ 100kHz VIH,(VO+0.5V) ≤ VI ≤ 5.5V 140 -0.1 0.05 0.002 %/mA 50 µVRMS 2 V VSHDN SHDN Input Threshold ISHDN ISET SHDN Input Bias Current SHDN =GND or IN 0.1 100 nA SET Input Leakage SET = 1.3V, Adjust Version Only 0.1 2.5 nA FAULT Detection Voltage VO ≥ 2.5V, IOUT =200mA 150 280 mV FAULT Output Low Voltage ISINK=2mA 0.13 0.25 V FAULT =3.6V, SHDN =0V 0.1 100 nA V FAULT I FAULT FAULT Off-Leakage Current TSD Thermal Shutdown Temperature VIL,(VO+0.5V) ≤ VI ≤ 5.5V 160 Thermal Shutdown Hysteresis TON Start-Up Time DS7982 Ver 1.4 May.2005 0.4 20 COUT =10µF, VO at 90% of Final Value 5 80 °C µs EUP7982 Typical Operating Characteristics Unless otherwise specified, VIN = VO + 0.5V, CIN=COUT = 2.2 µF, CCC= 22 nF, TJ= 25°C, VSHDN=VIN Output Voltage Change vs Temperature Dropout Voltage vs. Load Current 0.2 160 140 Dropout Voltage(mV) Vout Change (%) 0.0 -0.2 -0.4 -0.6 120 100 Tj= -40 Tj=25 Tj=85 80 60 40 20 -0.8 0 14 0 12 0 10 0 50 20 0 -2 0 -4 0 -5 5 0 T emperature 175 175 150 150 125 100 75 50 200 250 300 125 TA= 25 TA= 85 Tj=-40 100 75 50 0 0 0 50 100 150 200 Load Current(mA) 250 300 2.6 Supply Current vs Load Current 300 250 Supply Current (uA) 150 Load Current(mA) 25 25 200 Tj=25 Tj=85 TJ=-40 150 100 50 0 0 100 Supply Current vs. Input Voltage(SOT25) 200 Supply Current(uA) FAULT Detect Threshold(mV) FAULT Dectect Threshold vs Load Current 50 50 100 150 200 Load Current(mA) DS7982 Ver 1.4 May.2005 250 300 6 3 3.4 3.8 4.2 4.6 Input Voltage(V) 5 5.4 5.8 EUP7982 Output Noise (10kHz to 100kHz) Line Transient Response Load Transient Shutdown Response Power-up Response Power-down Response DS7982 Ver 1.4 May.2005 7 EUP7982 Application Information Noise Bypass Capacitor Connecting a 33nF 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. 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 EUP7982 requires external capacitors for regulator stability. The EUP7982 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 EUP7982 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. 1µF ceramic capacitor are fine for most end use applications. 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 EUP7982 will remain stable and in regulation with no external load. This is specially important in CMOS RAM keep-alive applications. Output Capacitance The EUP7982 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 EUP7982 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) × IO Power dissipation resulting from quiescent current is negligible. Excessive power dissipation triggers the thermal protection circuit. DS7982 Ver 1.4 May.2005 8 EUP7982 Adjustable Operation Fault Detection The EUP7982 provides a FAULT pin that goes low during out of regulation conditions like current limit and thermal shutdown, or when it approaches dropout. The latter monitors the input-to-output voltage differential and compares it against a threshold that is slightly above the dropout voltage. This threshold also tracks the dropout voltage as it varies with load current. Refer to Fault Detect vs. Load Current curve in the typical characteristics section. The adjustable version of the EUP7982 has an output voltage range of 1.25V to 6V. The output voltage of the EUP7982 adjustable regulator is programmed using an external resistor divider as shown in Figure3. The output voltage is calculated using: R V = V × (1 + 1 ) O ref R 2 Where: Vref=1.23V typ. (the internal reference voltage) The FAULT pin requires a pull-up resistor since it is an open-drain output. This resistor should be large in value to reduce energy drain. A100kΩ pull-up resistor works well for most applications. Utilize the following equation for adjusting the output to a particular voltage: V PI = R 2 O − 1 1.23V Shutdown The EUP7982 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. 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 OUT and SET Fast Start-up The EUP7982 provides fast start-up time for better system efficiency. The start-up speed is maintained when using the optional noise bypass capacitor. Figure3. Adjustable LDO Regulator Programming DS7982 Ver 1.4 May.2005 9 EUP7982 Packaging Information MSOP-8 NOTE 1. Package body sizes exclude mold flash and gate burrs 2. Dimension L is measured in gage plane 3. Tolerance 0.10mm unless otherwise specified 4. Controlling dimension is millimeter. Converted inch dimensions are not necessarily exact. SYMBOLS A A1 A2 b C D E E1 e L y θ DS7982 Ver 1.4 May.2005 DIMENSIONS IN MILLIMETERS MIN. NOM. MAX. 0.81 0.95 1.10 0.05 0.09 0.15 0.76 0.86 0.97 0.28 0.30 0.38 0.13 0.15 0.23 2.90 3.00 3.10 4.70 4.90 5.10 2.90 3.00 3.10 -----0.65 ----0.40 0.53 0.66 ----------0.10 0 -----6 10 DIMENSIONS IN INCHES MIN. NOM. MAX. 0.032 0.0375 0.043 0.002 0.004 0.006 0.030 0.034 0.038 0.011 0.012 0.015 0.005 0.006 0.009 0.114 0.118 0.122 0.185 0.193 0.201 0.114 0.118 0.122 -----0.026 -----0.016 0.021 0.026 ----------0.004 0 -----6