EUP7987-28VIR0

EUP7987 300mA Low-Noise Ultra Low-Dropout CMOS Regulator DESCRIPTION The EUP7987 low-noise, low-dropout, linear regulator operates from a 2.5V to 5.5V input and is guaranteed to deliver 300mA. The EUP7987 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. The EUP7987 is available in 1.8V, 2.5v, 2.8V, 3V, 3.3V, and adjustable versions. FEATURE 300mA Guaranteed Output Current (500mA for Pulsed Loads) 60dB PSRR at 1kHz 50µ VRMS Output Voltage Noise 140mV Dropout at 300mA Load 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 SOT23-5 and SOT23-6 Package RoHS Compliant and 100% Lead (Pb)-Free APPLICATIONS Wireless Handsets DSP Core Power Battery Powered Electronics Portable Information Appliances Block Diagram Figure1. DS7987 Ver 1.5 May .2005 1 EUP7987 Typical Application Circuit Figure2. Fixed-Voltage LDO Regulator Figure3 Adjustable LDO Regulator Programming DS7987 Ver 1.5 May .2005 2 EUP7987 Pin Configurations Part Number Pin Configurations EUP7987 SOT23-5 The set pin is internally disconnected for the fixed versions EUP7987 SOT23-6 Pin Description PIN SOT23-5 SOT23-6 DESCRIPTION VIN GND 1 2 1 2 Input voltage of the LDO Common Ground SHDN BP SET VOUT 3 4 3 4 5 SHDN places the entire device in shutdown mode when held low. Compensation 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 5 6 DS7987 Ver 1.5 May .2005 3 EUP7987 Ordering Information Order Number EUP7987-18VIR1 EUP7987-18VIR0 EUP7987-25VIR1 EUP7987-25VIR0 EUP7987-28VIR1 EUP7987-28VIR0 EUP7987-30VIR1 EUP7987-30VIR0 EUP7987-33VIR1 EUP7987-33VIR0 EUP7987VIR1 EUP7987VIR0 Package Type SOT23-5 SOT23-5 SOT23-5 SOT23-5 SOT23-5 SOT23-6 Marking J1 □ □ J2 □ □ J6 □ □ J5 □ □ J3 □ □ JA □ □ 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 EUP7987 □ □ □ □ □ □ 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 18: 1.8V 25: 2.5V 28: 2.8V 30: 3.0V 33: 3.3V Blank: Adjustable DS7987 Ver 1.5 May .2005 4 EUP7987 Absolute Maximum Ratings VIN, VOUT, V SHDN , VSET , VCC, ----------------------------------------------------------- -0.3V to 6V 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 VIN ∆ VO VO IO ILIMIT IQ Parameter Input Voltage Output Voltage Tolerance Output Adjust Range Maximum Output Current Output Current Limit Supply Current Shutdown Supply Current Conditions 100µA ≤ IOUT ≤ 300mA VIN=VO+0.5V, SET= OUT for the Adjust Versions Adjust Version Only Continuous 10ms pulse IOUT=0mA IOUT=300mA VO =0V, SHDN =GND IOUT =1mA IOUT =200mA 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 VIL,(VO+0.5V) ≤ VI ≤ 5.5V SHDN =GND or IN EUP7987 Min Typ Max. 2.5 -2 -3 1.25 300 5.5 +2 +3 5.5 Unit V % of VOUT(NOM) V mA mA mA µA µA mV %/V %/mA µVRMS V nA nA °C µs dB 500 600 110 240 0.06 0.4 90 140 -0.1 200 1 200 VDO Dropout Voltage Line Regulation Load Regulation ∆ VO en VSHDN ISHDN ISET 0.05 0.002 50 0.1 Output Voltage Noise SHDN Input Threshold SHDN Input Bias Current 1.6 0.4 0.1 0.1 160 20 100 2.5 SET Input Leakage Thermal Shutdown Temperature Thermal Shutdown Hysteresis Start-Up Time Power Supply Rejection Ratio SET = 1.3V, Adjust Version Only TSD TON PSRR COUT =10µF, VO at 90% of Final Value VIN=VOUT+0.5V, f=1kHZ 80 60 DS7987 Ver 1.5 May .2005 5 EUP7987 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 0.2 Dropout Voltage vs. Load Current 160 140 Dropout Voltage(mV) 0.0 Vout Change (%) 120 100 80 60 40 20 Tj= -40 Tj=25 Tj=85 -0.2 -0.4 -0.6 -0.8 50 20 0 14 0 10 0 12 0 -4 0 -5 5 -2 0 0 0 50 100 Load Current(mA) T emperature 150 200 250 300 Supply Current vs. Input Voltage(SOT25) Supply Current vs Load Current 300 250 Supply Current (uA) 200 150 100 50 0 Tj=25 Tj=85 TJ=-40 175 150 Supply Current(uA) 125 100 75 50 25 0 2.6 3 3.4 3.8 4.2 4.6 5 5.4 5.8 Input Voltage(V) TA= 25 TA= 85 Tj=-40 0 50 100 150 200 Load Current(mA) 250 300 Input Voltage vs Output Voltage(SOT25) 2.55 2.5 Vo(V) 2.45 2.4 2.35 2.3 3 3.5 4 4.5 Vin(V) 5 5.5 6 DS7987 Ver 1.5 May .2005 6 EUP7987 Output Noise (10kHz to 100kHz) Shutdown Response DS7987 Ver 1.5 May .2005 7 EUP7987 Application Information External Capacitors Like any low-dropout regulator, the EUP7987 requires external capacitors for regulator stability. The EUP7987 is specifically designed for portable applications requiring minimum board space and smallest components. These capacitors must be correctly selected for good performance. Input Capacitor 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. Power Dissipation and Junction Temperature A minimum input capacitance of 1µF is required between the EUP7987 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. No-Load Stability The EUP7987 will remain stable and in regulation with no external load. This is specially important in CMOS RAM keep-alive applications. Output Capacitance The EUP7987 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 EUP7987 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. 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: P D(max) T max − T A =J R 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. DS7987 Ver 1.5 May .2005 8 EUP7987 Adjustable Operation Shutdown The adjustable version of the EUP7987 has an output voltage range of 1.25V to 6V. The output voltage of the EUP7987 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 The EUP7987 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. Fast Start-up Where: Vref=1.23V typ. (the internal reference voltage) Utilize the following equation for adjusting the output to a particular voltage: V  PI = R 2  O − 1 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 The EUP7987 provides fast start-up time for better system efficiency. The start-up speed is maintained when using the optional noise bypass capacitor. DS7987 Ver 1.5 May .2005 9 EUP7987 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 θ1 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 DS7987 Ver 1.5 May .2005 10 EUP7987 SOT23-6 SYMBOLS A A1 A2 b C D E E1 e E1 L L1 L2 R R1 θ θ1 DS7987 Ver 1.5 May .2005 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° 11