EUP7961 1A Ultra Low-Dropout Linear Regulator DESCRIPTION FEATURES The EUP7961 is a 1A low-dropout linear regulator that provides a low voltage, high current output with minimum external components. The features include precision output voltage, ultra-low dropout voltage, and low ground current. The EUP7961 operates from an input of 2.5V to 5.5V. This regulator uses a 1µF ceramic input capacitors and a 4.7µF ceramic output capacitor to deliver 1A output current. High bandwidth provides excellent transient response. It is designed to power digital circuits requiring low voltage with high currents (i.e., PLDs, DSPs, microcontrollers, etc.). Other features include thermal and current limit protection, a logic-control shutdown mode and an error flag output that goes low when the output voltage drops 10% below the nominal value. It is available in fixed output voltages of 1.5V, 1.8V, 2.5V, 3.3V or adjustable output voltage with a 0.8V feedback voltage. The adjustable output voltage can be set from 0.8V to 4.5V. z z z z z z z z z z APPLICATIONS z z z z Typical Application Circuit Figure1. DS7961 Ver 1.4 Jan. 2009 1A Guaranteed Output Current 300mV Dropout Voltage at 1A Output Stable with Ceramic Capacitors ±1.8% Output Voltage Accuracy 300µA Low-Ground Pin Current 0.1µA Quiescent Current in Shutdown Mode Excellent Line and Load Regulation Thermal Shutdown and Current Limit Protection Error Flag Indication Available in SOT223, SOP-8 and SOT-89 Packages RoHS Compliant and 100% Lead (Pb)-Free 1 Supply for Low-Voltage Digital IC PC Add-In Cards High Efficiency Linear Power Supplies Post Regulator EUP7961 Block Diagram Figure2. Pin Configurations Package Type Pin Package Type Configurations SOT223-3 SOT223-3 (B) SOT223-3 (C) SOT-89 SOP-8 DS7961 Ver 1.4 Jan. 2009 2 Pin Configurations EUP7961 Pin Description SOT-223 SOT-223 SOT-89 (B) (C) DESCRIPTION PIN SOT-223 VEN - - - - 1 Enable Input. Logic high=enable, Logic low=shutdown VIN 1 3 2 3 2 Input Voltage of the LDO GND 2 1 1 2 5,6,7,8 VOUT 3 2 3 1 3 Output voltage of the LDO 4 ERROR Flag Output. Active-low indicated an output fault condition Adjustable Regulator Feedback Input. Connect to resistor voltage divider ERROR - - - - ADJ SOP-8 Ground: TAB is connected to ground Ordering Information Order Number Package Type EUP7961-15BIR1 SOT223 EUP7961-18BIR1 SOT223 EUP7961-25BIR1 SOT223 EUP7961-33BIR1 SOT223 EUP7961B-15BIR1 SOT223 EUP7961B-18BIR1 SOT223 EUP7961B-25BIR1 SOT223 EUP7961B-33BIR1 SOT223 EUP7961C-15BIR1 SOT223 EUP7961C-18BIR1 SOT223 EUP7961C-25BIR1 SOT223 EUP7961C-33BIR1 SOT223 EUP7961-15CIR1 SOT-89 EUP7961-18CIR1 SOT-89 EUP7961-25CIR1 SOT-89 EUP7961-33CIR1 SOT-89 DS7961 Ver 1.4 Jan. 2009 Marking xxxxx P7961C xxxxx P7961D xxxxx P7961B xxxxx P7961H xxxxx 7961CB xxxxx 7961DB xxxxx 7961BB xxxxx 7961HB xxxxx 7961C 1C xxxxx 7961C 1D xxxxx 7961C 1B xxxxx 7961C 1H xxxxx P7961C xxxxx P7961D xxxxx P7961B xxxxx P7961H 3 Operating Temperature Range -40 °C to +85°C -40 °C to +85°C -40 °C to +85°C -40 °C to +85°C -40 °C to +85°C -40 °C to +85°C -40 °C to +85°C -40 °C to +85°C -40 °C to +85°C -40 °C to +85°C -40 °C to +85°C -40 °C to +85°C -40 °C to +85°C -40 °C to +85°C -40 °C to +85°C -40 °C to +85°C EUP7961 Ordering Information (continued) Order Number Package Type EUP7961-15DIR1 SOP-8 EUP7961-18DIR1 SOP-8 EUP7961-25DIR1 SOP-8 EUP7961-33DIR1 SOP-8 EUP7961DIR1 SOP-8 Marking Operating Temperature Range xxxxx EUP7961 C xxxxx EUP7961 D xxxxx EUP7961 B xxxxx EUP7961 H xxxxx EUP7961 A -40 °C to +85°C -40 °C to +85°C -40 °C to +85°C -40 °C to +85°C -40 °C to +85°C EUP7961- □ □ □ □ □ □ Lead Free Code 1: Lead Free 0: Lead Packing R: Tape & Reel Operating temperature range I: Industry Standard Package Type: B: SOT223 C: SOT89 Output Voltage DS7961 Ver 1.4 Jan. 2009 4 D: SOP EUP7961 Absolute Maximum Ratings (1) VIN,VOUT to GND -------------------------------------------------------------------- -0.3V to 6V Other Pins to GND ------------------------------------------------------------------ -0.3V to 6V Package Thermal Resistance SOT-223, θJA ---------------------------------------------------------------------- 115°C /W SOP-8, θJA ------------------------------------------------------------------------- 125°C /W Power Dissipation, PD@TA= +25°C SOT-223 --------------------------------------------------------------------------0.87W SOP-8 -----------------------------------------------------------------------------0.8W Maximum Junction Temperature ---------------------------------------------------+150°C Storage Temperature --------------------------------------------------------- -65°C to +150°C Lead Temp (Soldering 10sec.)----------------------------------------------------------+300°C ESD Rating 2kV Human Body Model ------------------------------------------------------------------- Recommended Operating Conditions (2) Supply Voltage VIN ---------------------------------------------------------------- 2.5V to 5.5V Enable Input Voltage -------------------------------------------------------------0V to 5.5V Operating Temperature Range ---------------------------------------------40°C to +85°C Note (1): Stress beyond those listed under “Absolute Maximum Ratings” may damage the device. Note (2): The device is not guaranteed to function outside the recommended operating conditions. Electrical Characteristics Specifications in standard type face are for TA= +25°C, and those with boldface type apply over the full operating temperature range TA= -40°C to +85°C. VIN=VOUT(NOM)+1V, VEN＝5V, IL=10mA, CIN=COUT=4.7µF unless otherwise specified. Symbol ΔVOUT Parameter VOUT+1V ≤ VIN ≤ 5.5V 10mA ≤ IL ≤ 1A TA= +25°C Output Voltage Tolerance VOUT+1V ≤ VIN ≤ 5.5V 10mA ≤ IL ≤ 1A TA= -40°C ~ +85°C IO(PK) EUP7961 Min Typ Max. -1.8 1.8 -3 3 Unit % Line Regulation VOUT+1V ≤ VIN ≤ 5.5V 0.1 0.24 % Load Regulation 10mA ≤ IL ≤ 1A 0.08 0.32 % IL = 100mA 35 50 IL = 1A 300 500 IL = 10mA 300 360 IL = 1A 500 600 VEN ≤ 0.3V 0.01 10 VIN -VOUT Dropout Voltage IGND Conditions Ground Pin Current in Normal Operation Mode Ground Pin Current in Shutdown Mode Peak Output Current VO ≥ VO(NOM) -4% mV µA µA 1.1 1.5 A 1.2 1.7 A Short Circuit Protection ISC DS7961 Short Circuit Current Ver 1.4 Jan. 2009 5 EUP7961 Electrical Characteristics (continued) Specifications in standard type face are for TA= +25°C, and those with boldface type apply over the full operating temperature range TA= -40°C to +85°C. VIN=VOUT(NOM)+1V, VEN＝5V, IL=10mA, CIN=COUT=4.7µF unless otherwise specified. Symbol VIH VIL Parameter Enable Threshold Conditions Output = High EUP7961 Min Typ Max. 1.4 VIN Output = Low 0 0.3 TdOFF Turn-off delay IL = 1A 20 50 TdON Turn-on delay IL = 1A 20 50 VEN Pin Input Current VEN=VIN IEN -1 Unit V µs 1 µA 12 % ERROR Flag VT Threshold VTH Threshold Hysteresis VEF(Sat) Td ERROR Flag Saturation 8 5 ISINK=100µA 0.02 Flag Reset Delay ERROR Flag Pin Leakage Current ERROR Flag Pin Sink Imax Current AC Parameters IIK PSRR en Ripple Rejection Output Noise Voltage 10 VError=0.5V VIN=VOUT+1V COUT=10uF VOUT=3.3V, f=120Hz BW=10Hz -100kHz VOUT=2.5V % 0.1 V 1 µs 1 nA 3.8 mA 60 dB 150 µV(rms) 150 °C 10 °C Over Temperature Protection TSH(t) TSH(h) DS7961 Shutdown Threshold Thermal Shutdown Hysteresis Ver 1.4 Jan. 2009 6 EUP7961 Typical Operating Characteristics DS7961 Ver 1.4 Jan. 2009 7 EUP7961 Typical Operating Characteristics (continued) DS7961 Ver 1.4 Jan. 2009 8 EUP7961 Application Note Input Capacitor An input capacitance of 1µF is required between the EUP7961 input pin and ground (the amount of the capacitance may be increased without limit).This capacitor must be located very close to the input pin and returned to a clean analog ground. Any good quality ceramic, tantalum, or film capacitor can 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 EUP7961 is designed specifically to work with small ceramic output capacitors. A ceramic capacitor (temperature characteristics X7R, X5R, Z5U, or Y5V) in 4.7µF to 22µF range with 5mΩ to 200mΩ ESR range is suitable in the EUP7961 application circuit. The output capacitor must meet the requirement for minimum 4.7µF over the entire operating range and also have an ESR (Equivalent Series Resistance) value which is within a stable range (5mΩ to 200mΩ) voltage is calculated using: V =V O ref × (1 + R R 1) 2 Where: Vref= 0.8V typ. (the internal reference voltage) Utilize the following equation for adjusting the output to a particular voltage: V PI = R O − 1 2 0.8V Choose R2=50k to optimize accuracy, power supply rejection, noise and power consumption. No-Load Stability The EUP7961 will remain stable and in regulation with no external load. This is specially important in CMOS RAM keep-alive applications. On/Off Input Operation The EUP7961 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 swing above and below the specified turn-on/off voltage thresholds listed in the Electrical Characteristics section under VIL and VIH. Power Dissipation EUP7961 can deliver a continuous current of 2A over the full operating temperature range. A heatsink may be required depending on the maximum power dissipation and maximum ambient temperature of the application. Under all possible conditions, the junction temperature must be within the range specified under operating conditions. The total power dissipation of the device is given by: ERROR Flag Operation The EUP7961 produces a logic low signal at the ERROR Flag pin when the output drops out of regulation due to low input voltage, current limiting, or thermal limiting. This flag has a built in hysteresis. The ERROR is an open drain output. Hence, the ERROR pin should be pulled high through a pull up resistor. The ERROR pin must be connected to ground if this function is not used. In shutdown, the ERROR pin is Hi-Z state to save input power. P = V −V I + V I D IN IN GND OUT OUT Adjustable Operation The adjustable version of the EUP7961 has an output voltage range of 0.8V to 4.5V. The output voltage of the EUP7961 adjustable regulator is programmed using an external resistor divider as shown in Figure3. The output DS7961 Ver 1.4 Jan. 2009 9 ( ) ( ) Where IGND is the operating ground current of the device (specified under Electrical Characteristics). The maximum allowable temperature rise (TRmax) depends on the maximum ambient temperature (TAmax) of the application, and the maximum allowable junction temperature (TJmax): TRmax= TJmax-TAmax The maximum allowable value for junction to ambient Thermal Resistance, θJA , can be calculated using the formula: θJA =TRmax/PD EUP7961 PCB Layout Good PCB layout practices must be used, otherwise instability can be induced because of ground loops and voltages drops. The input and output capacitors must be directly connected to the input, output, and ground pins of the regulator using traces which do not have other currents flowing in them.The best way to do this is to lay out CIN and COUT near the device with short traces to the VIN, VOUT, and ground pins. The regulator ground pin should be connected to the external circuit ground so that the regulator and its capacitors have a “single point ground”. DS7961 Ver 1.4 Jan. 2009 10 EUP7961 Packaging Information SOT223-3 SYMBOLS A A1 B B1 D E e H L DS7961 Ver 1.4 Jan. 2009 MILLIMETERS MIN. MAX. 1.50 1.80 0.00 0.10 0.60 0.80 2.90 3.10 6.50 3.50 2.30 6.70 7.30 0.80 1.10 11 INCHES MIN. 0.059 0.000 0.024 0.114 0.256 0.138 0.090 0.264 0.031 MAX. 0.071 0.004 0.031 0.122 0.287 0.043 EUP7961 SOP-8 SYMBOLS MILLIMETERS MIN. MAX. MIN. MAX. A 1.35 1.75 0.053 0.069 A1 0.10 0.25 0.004 0.010 D E 4.90 5.80 E1 Ver 1.4 0.193 6.20 0.228 3.90 0.244 0.153 L 0.40 1.27 0.016 0.050 b 0.31 0.51 0.012 0.020 e DS7961 INCHES Jan. 2009 1.27 0.050 12 EUP7961 SOT-89 SYMBOLS A L B1 B C D D1 H E e DS7961 Ver 1.4 Jan. 2009 MILLIMETERS MIN. MAX. 1.40 1.60 0.89 1.20 0.36 0.48 0.44 0.56 0.35 0.44 4.40 4.60 1.35 1.83 3.94 4.25 2.29 2.60 1.50 13 INCHES MIN. 0.055 0.035 0.014 0.017 0.014 0.173 0.053 0.155 0.090 0.059 MAX. 0.063 0.047 0.019 0.022 0.017 0.181 0.072 0.167 0.102