EUP7907A EUTECH | Alldatasheet

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Technical content

DS7907A Ver 1.1 Mar. 2009 600mA Low Noise High PSRR Low Dropout Linear Regulator

DESCRIPTION

The EUP7907A is a high current, low dropout linear regulator with fast transient response and high PSRR. It offers high output accuracy, extremely low dropout voltage, low quiescent current and fast start-up time. The EUP7907A is designed to work with low-ESR ceramic capacitor, reducing the amount of the PCB area necessary for power applications. Only a 2.2uF ceramic capacitor can make the device stable over the whole load range. The EUP7907A monitors the input voltage for power on reset to ensure the regulator is disabled when the input voltage is not high enough for normal operation. When EUP7907A detects fault signal, such as over-temperature, it will turn off the pass transistor and discharge VOUT to GND from the internal resistor. EUP7907A only can be operated in fixed mode, the pre-set valve is from 1.2V~3.6V . By setting the capacitor connected to BYPASS pin can get high PSRR. Other key features include over-current protection, thermal shutdown. The device can be available in the TDFN-6 and SOT23-5 package.

FEATURES

z 2.5V to 5.5V Input V oltage Range z 300mV@600mA Dropout V oltage z Excellent Transient Response z Stable with 2.2uF Ceramic Output Capacitor z 70dB PSRR at 1kHz z Low 120µA Quiescent Current z Low Shutdown Current:<1µA z Output Current Limit z Output V oltage With High Accuracy: 2% Initial Accuracy Fixed Output V oltage: 1.2V ~ 3.6V z Thermal Shutdown z COUT Auto-Discharge when Shutdown z RoHS Compliant and 100% Lead (Fb)-Free

APPLICATIONS

z Bluetooth portable radios and Accessories z battery-Powered Equipment z Laptop, Palmtops, Notebook Compute Typical Application Circuit Figure. 1 Fixed Output

DS7907A Ver 1.1 Mar. 2009 Block Diagram Figure. 2 Pin Configurations Package Type Pin Configurations Package Type Pin Configurations SOT23-5 TDFN-6 Pin Description PIN SOT23-5 TDFN-6 DESCRIPTION VIN 1 3 Input V oltage of the LDO. GND 2 2 Signal Ground. EN 3 1 Enable Pin. Connect this pin to ground or less than 0.4V to disable the device. High-Z for EUP7907A. BYPASS 4 6 Optional bypass capacitor for low noise and high PSRR. VOUT 5 4 Output voltage of the LDO. NC - 5 No connected.

DS7907A Ver 1.1 Mar. 2009

Ordering Information

Order Number Package Type Markin g Operating Temperature Range EUP7907A-12VIR1 SOT23-5 xxxxx AA1T -40 °C to +85°C EUP7907A-15VIR1 SOT23-5 xxxxx AA1C -40 °C to +85°C EUP7907A-18VIR1 SOT23-5 xxxxx AA1D -40 °C to +85°C EUP7907A-25VIR1 SOT23-5 xxxxx AA1B -40 °C to +85°C EUP7907A-28VIR1 SOT23-5 xxxxx AA1E -40 °C to +85°C EUP7907A-33VIR1 SOT23-5 xxxxx AA1H -40 °C to +85°C EUP7907A-XXVIR1 SOT23-5 xxxxx xxxx -40 °C to +85°C EUP7907A-12JIR1 TDFN-6 xxx AT -40 °C to +85°C EUP7907A-15JIR1 TDFN-6 xxx AC -40 °C to +85°C EUP7907A-18JIR1 TDFN-6 xxx AD -40 °C to +85°C EUP7907A-25JIR1 TDFN-6 xxx AB -40 °C to +85°C EUP7907A-28JIR1 TDFN-6 xxx AE -40 °C to +85°C EUP7907A-33JIR1 TDFN-6 xxx AH -40 °C to +85°C EUP7907A-XXJIR1 TDFN-6 xxx xx -40 °C to +85°C Lead Free Code 1 : L e a d F r e e 0 : L e a d P a c k i n g R : T a p e & R e e l Operating temperature range I: Industry Standard Package Type V : S O T - 2 3 J : T D F N Output Voltage XX: Voltage Options (1.2V~3.6V , 0.05V per step)

DS7907A Ver 1.1 Mar. 2009 Absolute Maximum Ratings „ ESD Rating Recommend Operating Conditions

Electrical Characteristics

TA=+25℃, VIN=VOUT+1V , or VIN=2.5V for VOUT<1.5V unless otherwise specified EUP7907A Symbol Parameter Conditions Min. Typ. Max. Unit Input Voltage VIN Input V oltage 2.5 5.5 V VPORTH POR Threshold 2.1 V VPORHYS POR hysteresis 0.4 V IQ Quiescent Current V EN=VIN, IOUT=0mA 120 180 µA ISHDN Shutdown Current V EN=0V 0.1 1 µA VIN=VNOM+1VP-P,f=1kHz,ILOAD=10mA 70 PSRR Power Supply Ripple Rejection VIN=VNOM+1VP-P,f=10kHz,ILOAD=10mA 70 dB VFB FB Pin V oltage 0.784 0.8 0.816 V Enable VENH Enable High V oltage Over temperature range 1.5 V VENL Disable Low V oltage Over temperature range 0.4 V IEN EN Input Current V IN=5V , VEN=5V or 0V -1 1 µA TST Start-up Time C BYPASS=10nF 120 µs Output voltage VIN=VNOM+1.0V , IOUT=10mA -2 +2 % VOUT Output V oltage Accuracy VIN=VNOM+1.0V , IOUT=10mA, TEMP=-40℃ to 85℃ -3 +3 % VLNR Output Line Regulation V OUT+0.5V<VIN<5.5V , IOUT=10mA 0.04 0.1 %/V VLDR Output Load Regulation 1 mA <I OUT<600mA, VIN=VNOM+1.0V 17 30 mV IOUT=300mA 180 240 VDROP Dropout V oltage (Applied for VOUT≥2.3V) IOUT=600mA 360 450 mV IOUTMAX Maximum Output Current 600 mA

DS7907A Ver 1.1 Mar. 2009 Electrical Characteristics (continued) TA=25℃, VIN=VOUT+1V , or VIN=2.5V for VOUT<1.5V unless otherwise specified EUP7907A Symbol Parameter Conditions Min. Typ. Max. Unit Protection ILIMIT Current Limit 600 900 mA TSD Thermal Shutdown Temperature No Load, VIN=VEN=5V 170 ℃ TSDHYS Thermal Shutdown Hysteresis No Load, VIN=VEN=5V 30 ℃ Note 1: Stresses listed as the above “Absolute Maximum Ratings” may cause permanent damage to the device. These are for stress ratings. Functional operation of the device at thes e or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may remain possibility to affect device reliability. Note 2: Dropout is defined as V IN-VOUT when VOUT is 100mV below the value of VOUT for VIN=VOUT+0.5V . Note 3: Test time needed for VOUT to reach 90% of final value

DS7907A Ver 1.1 Mar. 2009 Typical Characteristics

DS7907A Ver 1.1 Mar. 2009 Typical Characteristics (continued)

DS7907A Ver 1.1 Mar. 2009 Typical Characteristics (continued)

DS7907A Ver 1.1 Mar. 2009 Function Description The EUP7907A is a high output current, low dropout linear regulator with fast transient response and high PSRR. It offers high output accuracy, extremely low dropout voltage, low quiescent current and fast start-up time. It is designed to work with low-ESR ceramic capacitor, reducing the amount of the PCB area. Only a 2.2uF ceramic capacitor can make the device stable over the whole load range. As shown in the function block diagram, the EUP7907A is composed of the bandgap reference voltage, the error amplifier, P-channel MOSFET pass transistor, internal resistor divider and some additional protection circuits. The reference voltage, connected to the cathode terminal of the error amplifier, compares with the feedback voltage to regulate the output voltage to make it constant over the whole load range. If the feedback voltage is lower than the reference voltage, the pass transistor gate is pulled low to increase its conductivity. This allows more current to flow to the output and increases the output voltage. If the feedback voltage is higher than the reference voltage, the pass transistor allows less current to flow to the output. The feedback point is the output of the internal or external resistor divider connected to the VOUT pin. Supply Input Power on Reset The input voltage supplies current to the output and the operation voltage of the internal circuit. The input voltage is monitored for power on reset (POR) to ensure the regulator is disabled when the input voltage is not high enough for normal operation. The POR threshold voltage is 2.1V at VIN rising typically. Enable/Shutdown The EUP7907A is disabled when the EN pin is connected to ground or the voltage less than 0.4V , reducing the quiescent current to less than 1uA. In the shutdown mode the error amplifier, the reference voltage, the driver and the pass transistor are all disabled. Make this pin higher than 1.5V to enable the device. If this pin of EUP7907A is floating, the regulator on/off is unstable. To assure proper operation the EN should be pulled higher than the level listed in the Electrical Characteristics section. Soft Stop When the regulator is disabled, an internal 40 0Ω resistor is connected between V OUT and GND. This is intended to discharge C OUT. The internal resistor is not used when the device turns on. Current Limit The EUP7907A includes a current limit circuit to monitor the gate voltage of the pass transistor to limit the output current. When th e output current is higher than the over-current limit, the circuit will clamp the gate voltage of the pass transistor to keep the current flowing to the output. The typical value is 0.9A. Thermal Shutdown The EUP7907A monitor its temperature automatically. When the operation junction temperature exceeds 170℃, the OTP circuit starts the thermal shutdown function to turn the pass transistor off until it cooled down by 30 ℃ then the pass transistor turned on again. For continue operation, do not exceed absolute maximum operation junction temperature. The circuit is a non-latched protection.

DS7907A Ver 1.1 Mar. 2009 W455.0220)C25C125(P )MAX(D =°−°= JAA)MAX(J)MAX(D )TT(P θ−= () QINOUTOUTIND IVIVVP ×+×−= W111.190)C25C125(P )MAX(D =°−°=

Application Information

Like other low-dropout regulator, the EUP7907A requires external capacitors for stability. It is specifically designed for low-ESR capacitors requiring minimum PCB area and smallest components. Input Capacitor A 2.2uF capacitor is required between the VIN pin and the GND pin. Place it as close as possible to the device. There are no requirements for the ESR on the input capacitor, but the tolerance and temperature coefficient must be considered when selecting the capacitor to ensure the capacitance will be 2.2uF over the whole operating temperature range. Output Capacitor The EUP7907A is designed specifically to work with very small ceramic output capacitors. A 2.2uF to 10uF with 5m Ω to 500m Ω ESR range is suitable in the EUP7907A application circuit. The ESR of a typical 2.2uF ceramic capacitor is about 20m Ω, which easily meets the ESR requirement for stability. Capacitor Characteristics More consideration should be taken when selecting the capacitor because its capacitance can vary with temperature. The capacitor type X7R or X5R, which operates over a temperature range of -40 ℃ to +85 ℃, will only vary within ±15%. Some large value ceramic capacitors are manufactured with Z5U or T5V temperature characteristics. Their capacitance can drop by more than 50% as the temperature goes from 25 ℃ to 85℃. Therefore the capacitor type X7R or X5R is recommended in applications where the ambient temperature will change significantly above or below 25℃. No Load Stability The EUP7907A will remains stable and in regulation with no external load. This is special important in CMOS RAM keep-alive applications. Thermal Considerations Thermal protection limits power dissipation in EUP7907A.When the operation junction temperature exceeds 170°C, the OTP circuit starts the thermal shutdown function and turns the pass element off. The pass element turn on again after the junction temperature cools by 30°C. For continuous operation, do not exceed absolute maximum operation junction temperature 125°C. The power dissipation definition in device is: (EQ.3) The maximum power dissipation depends on the thermal resistance of IC package, PCB layout, the rate of surroundings airflow and temperature difference between junction to ambient. The maximum power dissipation can be calculated by following formula : ( E Q . 4 ) Where T J(MAX) is the maximum operation junction temperature 125°C, TA is the ambient temperature and the θJA is the junction to ambient thermal resistance. For recommended operating conditions specification of EUP7907A, where T J(MAX) is the maximum junction temperature of the die (125°C) and T A is the operated ambient temperature. The junction to ambient thermal resistance θ JA is layout dependent. For SOT-23-5 package, the thermal resistance θJA is 220°C/W on the standard thermal test board. For TDFN-6 package, the thermal resistance θ JA is 90°C/W on the standard thermal test board. The maximum power dissipation at T A = 25°C can be calculated by following formula : ( E Q . 5 ) f o r S O T 2 3 - 5 p a c k a g e (EQ.6) f o r T D F N - 6 p a c k a g e The maximum power dissipation depends on operating ambient temperature for fixed T J(MAX) and thermal resistance θJA. For EUP7907A packages, the Figure 3 of derating curves allows the designer to see the effect of rising ambient temperature on the maximum power allowed. Figure 5. Power Dissipation for EUP7907A Packages TDFN-6 and SOT23-5 packages.

DS7907A Ver 1.1 Mar. 2009 Packaging Information SOT23-5 MILLIMETERS INCHES SYMBOLS MIN. MAX. MIN. MAX. A - 1.30 - 0.052 A1 0.00 0.15 0.000 0.006 D 2.90 0.114 E1 1.60 0.063 E 2.60 3.00 0.102 0.118 L 0.30 0.60 0.012 0.024 b 0.30 0.50 0.012 0.020 e 0.95 0.037

DS7907A Ver 1.1 Mar. 2009 TDFN-6 MILLIMETERS INCHES SYMBOLS MIN. MAX. MIN. MAX. A 0.70 0.80 0.028 0.031 A1 0.00 0.05 0.000 0.002 b 0.20 0.40 0.008 0.016 D 1.90 2.10 0.075 0.083 D1 1.40 0.055 E 1.90 2.10 0.075 0.083 E1 0.80 0.031 e 0.65 0.026 L 0.25 0.45 0.010 0.018 DETAIL A