EUP7962 2A Ultra Low-Dropout Linear Regulator DESCRIPTION FEATURES The EUP7962 is a 2A low-dropout linear regulator that provides a low voltage, high current output with a minimum of external components. It offers high precision, ultra-low dropout, and low ground current. The EUP7962 operates from an input of 2.5V to 5.5V. This regulator uses small, 2.2µF ceramic input capacitors and 10µF ceramic output capacitors to deliver 2A output current. High bandwidth provides excellent transient response. It is designed to drive digital circuits requiring low voltage at 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 nominal value. It is available in fixed output voltages of 1.5V, 1.8V, 2.5V, 3.3V and as an adjustable device with a 0.8V reference 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. DS7962 Ver 1.4 Oct. 2007 2A Guaranteed Output Current 600mV Dropout Voltage at 2A Output Stable with Ceramic Capacitors ±1.8% Output Voltage Accuracy 1mA 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 To-263,To-220 and SOP-8 (FD) Packages RoHS Compliant and 100% Lead (Pb)-Free 1 LDO Linear Regulator for Low-Voltage Digital IC PC Add-In Cards High Efficiency Linear Power Supplies Post Regulator EUP7962 Block Diagram Figure2. DS7962 Ver 1.4 Oct. 2007 2 EUP7962 Pin Configurations Package Type Pin Configurations TO220-3 TO220-5 TO263-3 TO263-5 SOP-8 (FD) ＊Thermal Pad Pin Description VEN TO220-5 TO263-5 1 TO220-3 TO263-3 - VIN 2 GND VOUT PIN SOP-8 (FD) DESCRIPTION - Enable Input. Logic high=enable, Logic low=shutdown 1 3 Input Voltage of the LDO 3 2 8 Ground: TAB is connected to ground 4 3 6 Output voltage of the LDO - ERROR 5 - ADJ 7 SD - - 2 NC - - 1,4,5 DS7962 Ver 1.4 Oct. 2007 ERROR Flag Output. Active-low indicated an output fault condition Adjustable Regulator Feedback Input. Connect to resistor voltage divider Shutdown terminal No internal connection 3 EUP7962 Ordering Information Order Number Package Type EUP7962-15KAIR1 TO220-3 EUP7962-18KAIR1 TO220-3 EUP7962-25KAIR1 TO220-3 EUP7962-33KAIR1 TO220-3 EUP7962-15KBIR1 TO220-5 EUP7962-18KBIR1 TO220-5 EUP7962-25KBIR1 TO220-5 EUP7962-33KBIR1 TO220-5 EUP7962KBIR1 TO220-5 EUP7962-15LAIR1 TO263-3 EUP7962-18LAIR1 TO263-3 EUP7962-25LAIR1 TO263-3 EUP7962-33LAIR1 TO263-3 EUP7962-15LBIR1 TO263-5 EUP7962-18LBIR1 TO263-5 EUP7962-25LBIR1 TO263-5 EUP7962-33LBIR1 TO263-5 EUP7962LBIR1 TO263-5 EUP7962DIR1 SOP-8 Marking xxxxx P7962C xxxxx P7962D xxxxx P7962B xxxxx P7962H xxxxx P7962C xxxxx P7962D xxxxx P7962B xxxxx P7962H xxxxx P7962A xxxxx EUP7962C xxxxx EUP7962D xxxxx EUP7962B xxxxx EUP7962H xxxxx EUP7962C xxxxx EUP7962D xxxxx EUP7962B xxxxx EUP7962H xxxxx EUP7962A xxxxx EUP7962 A Operating Temperature range -40 °C to 125°C -40 °C to 125°C -40 °C to 125°C -40 °C to 125°C -40 °C to 125°C -40 °C to 125°C -40 °C to 125°C -40 °C to 125°C -40 °C to 125°C -40 °C to 125°C -40 °C to 125°C -40 °C to 125°C -40 °C to 125°C -40 °C to 125°C -40 °C to 125°C -40 °C to 125°C -40 °C to 125°C -40 °C to 125°C -40 °C to 125°C EUP7962-□ □ □ □ □ □ □ Lead Free Code 1: Lead Free 0: Lead Packing R: Tape & Reel Operating temperature range I: Industry Standard Package Type: KA: TO220-3 KB:TO220-5 LA: TO263-3 LB: TO263-5 D: SOP Output Voltage 15: 1.5V, 18: 1.8V,25: 2.5V, 33: 3.3V ,Black: Adjustable DS7962 Ver 1.4 Oct. 2007 4 EUP7962 Absolute Maximum Ratings Supply Voltage VIN ---------------------------------------------------------------------- 5.5V Package Thermal Resistance TO-263, θJA ------------------------------------------------------------------------- 45°C /W TO-220, θJA ------------------------------------------------------------------------- 55°C /W SOP-8 (FD), θJA -------------------------------------------------------------------- 42.3°C/W Power Dissipation, PD@TA=25°C TO-263 ------------------------------------------------------------------------------ 2.2W TO-220 ------------------------------------------------------------------------------ 1.8W SOP-8 (FD) ------------------------------------------------------------------------- 0.8W Junction Temperature ------------------------------------------------------------------- 150°C Storage Temperature ------------------------------------------------------ -65°C to +150°C Lead Temp -----------------------------------------------------------------------------260°C ESD Rating Human Body Model ---------------------------------------------------------------------- 2kV Operating Ratings Supply Voltage VIN ---------------------------------------------------------------- 2.5 to 5.5V Enable Input Voltage -------------------------------------------------------------- 0V to 5.5V Junction Temperature ------------------------------------------------------ -40°C to +125°C Electrical Characteristics Limits in standard typeface are for TJ =25°C. Unless otherwise specified: VIN= VOUT(nom) +1V, IL=10mA, COUT=10µF Symbol ΔVOUT Parameter Output Voltage Tolerance VOUT+1V ≤ VIN ≤ 5.5V 10mA ≤ IL ≤ 2A Line Regulation VOUT+1V ≤ VIN ≤ 5.5V Load Regulation 10mA ≤ IL ≤ 2A VIN -VOUT Dropout Voltage IGND IO(PK) Conditions Ground Pin Current in Normal Operation Mode % 0.09 0.2 %/ ∆ V 0.04 0.2 %/ ∆ A IL = 150mA 41 50 IL = 2A 600 700 IL = 0A 1 1.5 IL = 2A 1.3 1.9 VEN ≤0.3V Peak Output Current VO ≥ VO(NOM) -4% -1.8 Unit 1.8 Ground Pin Current in Shutdown Mode 0.01 Short Circuit Protection ISC Short Circuit Current DS7962 Ver 1.4 Oct. 2007 EUP7962 Min Typ Max. 5 10 mV mA µA 3 A 3.5 A EUP7962 Electrical Characteristics Limits in standard typeface are for TJ =25°C. Unless otherwise specified: VIN= VOUT(nom) +1V, IL=10mA,COUT=10µF Symbol VIH Parameter Enable Threshold VIL Conditions Output = High EUP7962 Min Typ Max. 1.4 Output = Low 0.3 Unit V TdOFF Turn-off delay IL = 2A 15 TdON Turn-on delay IL = 2A 20 VEN Pin Input Current VEN=VIN 0.1 1 µA 8 10 12 % 3 5 7 % 0.02 0.1 V IEN ERROR VT Flag Threshold VTH VEF(Sat) Td IIK Imax Threshold Hysteresis Flag Saturation Flag Reset Delay ERROR ERROR Flag Pin Leakage Current ERROR Flag Pin Sink Current AC Parameters PSRR en ISINK=100µA Ripple Rejection Output Noise Voltage VError=0.5V VIN=VOUT+1V COUT=10uF VOUT=3.3V, f=120Hz BW=10Hz -100kHz VOUT=2.5V µs 1 µs 1 nA 3 mA 56 dB 150 µV(rms) 150 °C 15 °C Over Temperature Protection TSH(t) TSH(h) Shutdown Threshold Thermal Shutdown Hysteresis DS7962 Ver 1.4 Oct. 2007 6 EUP7962 Typical Operating Characteristics DS7962 Ver 1.4 Oct. 2007 7 EUP7962 DS7962 Ver 1.4 Oct. 2007 8 EUP7962 Application Note External Capacitors Like any low-dropout regulator, the EUP7962 requires external capacitors for regulator stability. These capacitors must be correctly selected for good performance. Input Capacitor An input capacitance of 2.2µF is required between the EUP7962 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 2.2µF over the entire operating temperature range. Output Capacitor The EUP7962 is designed specifically to work with very small ceramic output capacitors. A ceramic capacitor (temperature characteristics X7R, X5R, Z5U, or Y5V) in 4.7 to 22µF range with 5mΩ to 200mΩ ESR range is suitable in the EUP7962 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 (5mΩ to 200mΩ) No-Load Stability The EUP7962 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 EUP7962 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. DS7962 Ver 1.4 Oct. 2007 9 ERROR Flag Operation The EUP7962 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 internal ERROR flag comparator has an open drain output stage. 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. It should also be noted that when the shutdown pin is pulled low, the ERROR pin is forced to be invalid for reasons of saving power in shutdown mode. Adjustable Operation The adjustable version of the EUP7962 has an output voltage range of 0.8V to 4.5V. The output voltage of the EUP7962 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= 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. EUP7962 Power Dissipation EUP7962 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: ( ) ( ) P = V −V I + V I D IN IN GND OUT OUT 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 DS7962 Ver 1.4 Oct. 2007 10 PCB Layout Good PC layout practices must be used or 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”. It should be noted that stability problems have been seen in applications where “vias” to an internal ground plane were used at the ground points of the IC and the input and output capacitors. This was caused by varying ground potentials at these nodes resulting from current flowing through the ground plane. Using a single point ground technique for the regulator and it’s capacitors fixed the problem. Since high current flows through the traces going into VIN and coming from VOUT, Kelvin connect the capacitor leads to these pins so there is no voltage drop in series with the input and output capacitors. EUP7962 Packaging Information TO263-3 SYMBOLS MILLIMETERS INCHES MIN. MAX. MIN. MAX. A 4.06 4.83 0.160 0.190 C2 1.14 1.65 0.045 0.065 b 0.51 1.00 0.020 0.039 b1 1.14 1.40 0.045 0.055 D 8.38 9.65 0.330 0.380 E 9.65 10.67 0.380 0.420 e 2.54 0.100 H 14.60 15.88 0.575 0.625 L2 - 1.78 - 0.070 L 1.78 2.80 0.070 0.110 L1 - 1.68 - 0.066 D1 6.86 - 0.270 - E1 6.22 - 0.245 - DS7962 Ver 1.4 Oct. 2007 11 EUP7962 TO263-5 SYMBOLS MILLIMETERS INCHES MIN. MAX. MIN. MAX. A 4.06 4.83 0.160 0.190 C2 1.14 1.65 0.045 0.065 b 0.51 1.00 0.020 0.039 D 8.38 9.65 0.330 0.380 E 9.65 10.67 0.380 0.420 e 1.70 0.067 H 14.60 15.88 0.575 0.625 L 1.78 2.80 0.070 0.110 L1 - 1.68 - 0.066 D1 6.86 - 0.270 - E1 6.22 - 0.245 - DS7962 Ver 1.4 Oct. 2007 12 EUP7962 TO220-3 SYMBOLS A A2 b b1 C D D1 Q E E1 P e A1 L L1 DS7962 Ver 1.4 Oct. 2007 MILLIMETERS MIN. MAX. 4.06 4.83 2.03 2.92 0.64 1.02 1.14 1.52 0.30 0.56 13.72 15.75 7.62 9.40 2.62 2.87 9.65 10.67 4.88 5.33 3.71 4.00 2.54 1.14 1.40 12.70 14.73 6.35 13 INCHES MIN. 0.160 0.080 0.025 0.045 0.012 0.540 0.300 0.103 0.380 0.190 0.146 MAX. 0.190 0.115 0.040 0.060 0.022 0.620 0.370 0.113 0.420 0.210 0.156 0.100 0.045 0.500 - 0.055 0.580 0.250 EUP7962 TO220-5 SYMBOLS MILLIMETERS INCHES MIN. MAX. MIN. MAX. A 4.06 4.83 0.160 0.190 A2 2.03 2.92 0.080 0.115 b 0.64 1.02 0.025 0.040 C 0.30 0.56 0.012 0.022 D 13.72 15.75 6.540 0.620 D1 7.62 9.40 0.300 0.370 Q 2.62 2.87 0.103 0.113 E 9.65 10.67 0.380 0.420 E1 4.88 5.33 0.190 0.210 P 3.71 4.00 0.146 0.156 e 1.70 0.067 A1 1.14 1.40 0.045 0.055 L 12.70 14.73 0.500 0.580 DS7962 Ver 1.4 Oct. 2007 14 EUP7962 SOP-8 SYMBOLS MILLIMETERS INCHES MIN. MAX. MIN. MAX. A 1.35 1.75 0.053 0.069 A1 0.10 0.25 0.004 0.010 D 4.90 0.193 E1 3.90 0.153 D1 2.00 0.081 E2 2.00 0.081 E 5.80 6.20 0.228 0.244 L 0.40 1.27 0.016 0.050 b 0.31 0.51 0.012 0.020 e DS7962 Ver 1.4 Oct. 2007 1.27 0.050 15