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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.
EUP7907A
FEATURES
2.5V to 5.5V Input Voltage Range 300mV@600mA Dropout Voltage Excellent Transient Response Stable with 2.2uF Ceramic Output Capacitor 70dB PSRR at 1kHz Low 120A Quiescent Current Low Shutdown Current:<1A Output Current Limit Output Voltage With High Accuracy: 2% Initial Accuracy Fixed Output Voltage: 1.2V ~ 3.6V Thermal Shutdown COUT Auto-Discharge when Shutdown RoHS Compliant and 100% Lead (Fb)-Free
APPLICATIONS
Cellular Phones Bluetooth portable radios and Accessories battery-Powered Equipment Laptop, Palmtops, Notebook Compute
Typical Application Circuit
Figure. 1 Fixed Output
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Block Diagram
Figure. 2
Pin Configurations
Package Type Pin Configurations Package Type Pin Configurations
SOT23-5
TDFN-6
Pin Description
PIN VIN GND EN BYPASS VOUT NC SOT23-5 TDFN-6 1 2 3 4 5 3 2 1 6 4 5 Input Voltage of the LDO. Signal Ground. Enable Pin. Connect this pin to ground or less than 0.4V to disable the device. High-Z for EUP7907A. Optional bypass capacitor for low noise and high PSRR. Output voltage of the LDO. No connected. DESCRIPTION
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Ordering Information
Order Number EUP7907A-12VIR1 EUP7907A-15VIR1 EUP7907A-18VIR1 EUP7907A-25VIR1 EUP7907A-28VIR1 EUP7907A-33VIR1 EUP7907A-XXVIR1 EUP7907A-12JIR1 EUP7907A-15JIR1 EUP7907A-18JIR1 EUP7907A-25JIR1 EUP7907A-28JIR1 EUP7907A-33JIR1 EUP7907A-XXJIR1 EUP7907A - 1/4
1/4 1/4 1/4 1/4
Package Type SOT23-5 SOT23-5 SOT23-5 SOT23-5 SOT23-5 SOT23-5 SOT23-5 TDFN-6 TDFN-6 TDFN-6 TDFN-6 TDFN-6 TDFN-6 TDFN-6
1/4
Marking xxxxx AA1T xxxxx AA1C xxxxx AA1D xxxxx AA1B xxxxx AA1E xxxxx AA1H xxxxx xxxx xxx AT xxx AC xxx AD xxx AB xxx AE xxx AH xxx xx
Operating Temperature Range -40 C to +85C -40 C to +85C -40 C to +85C -40 C to +85C -40 C to +85C -40 C to +85C -40 C to +85C -40 C to +85C -40 C to +85C -40 C to +85C -40 C to +85C -40 C to +85C -40 C to +85C -40 C to +85C
Lead Free Code 1: Lead Free 0: Lead Packing R: Tape & Reel Operating temperature range I: Industry Standard Package Type V: SOT-23 J : TDFN Output Voltage 12:1.2V 15:1.5V 18:1.8V 25:2.5V 28:2.8V 33:3.3V XX: Voltage Options (1.2V~3.6V, 0.05V per step)
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Absolute Maximum Ratings
VIN,VEN -----------------------------------------------------------------------------------------------0.3 to 6V VOUT ------------------------------------------------------------------------------------------- -0.3 to (VIN+0.3) Junction Temperature -------------------------------------------------------------------------------150ae Storage Temperature Range ----------------------------------------------------------------- -65ae to +150ae Lead Temperature -----------------------------------------------------------------------------------260ae Thermal Resistance JA (SOT23-5) --------------------------------------------------------------220ae /W Thermal Resistance JA (TDFN-6) ---------------------------------------------------------------90ae /W ESD Rating Human Body Model -------------------------------------------------------------------------2kV
Recommend Operating Conditions
VIN --------------------------------------------------------------------------------------------------- 2.5 to 5.5V VEN --------------------------------------------------------------------------------------------------0 to 5.5V Operating Temperature Range ---------------------------------------------------------------- -40ae to +85ae
Electrical Characteristics
TA=+25ae , VIN=VOUT+1V, or VIN=2.5V for VOUT<1.5V unless otherwise specified
Symbol
Input Voltage
Parameter
Input Voltage POR Threshold POR hysteresis Quiescent Current Shutdown Current Power Supply Ripple Rejection FB Pin Voltage Enable High Voltage Disable Low Voltage EN Input Current Start-up Time
Conditions
EUP7907A Min. Typ. Max.
2.5 2.1 0.4 120 0.1 70 0.784 70 0.8 0.816 5.5
Unit
VIN VPORTH VPORHYS IQ ISHDN PSRR VFB Enable VENH VENL IEN TST
V V
VEN=VIN, IOUT=0mA VEN=0V VIN=VNOM+1VP-P,f=1kHz,ILOAD=10mA VIN=VNOM+1VP-P,f=10kHz,ILOAD=10mA
180 1
V A A dB V V
Over temperature range Over temperature range VIN=5V, VEN=5V or 0V CBYPASS=10nF VIN=VNOM+1.0V, IOUT=10mA VIN=VNOM+1.0V, IOUT=10mA, TEMP=-40ae to 85ae VOUT+0.5V1.5 0.4 -1 120 -2 -3 0.04 17 180 360 600 +2 +3 0.1 30 240 450 1
V A s % % %/V mV mV mA
Output voltage VOUT VLNR VLDR VDROP IOUTMAX Output Voltage Accuracy Output Line Regulation Output Load Regulation Dropout Voltage (Applied for VOUT2.3V) Maximum Output Current
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Electrical Characteristics (continued)
TA=25ae , VIN=VOUT+1V, or VIN=2.5V for VOUT<1.5V unless otherwise specified
Symbol
Protection ILIMIT
Parameter
Conditions
EUP7907A Min. Typ. Max.
Unit
Current Limit 600 900 mA Thermal Shutdown TSD 170 No Load, VIN=VEN=5V ae Temperature Thermal Shutdown TSDHYS 30 No Load, VIN=VEN=5V ae Hysteresis 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 these 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 VIN-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
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Typical Characteristics
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Typical Characteristics (continued)
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Typical Characteristics (continued)
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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 400 resistor is connected between VOUT and GND. This is intended to discharge COUT. 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 the 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 170ae , the OTP circuit starts the thermal shutdown function to turn the pass transistor off until it cooled down by 30ae 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.
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Application Information
External Capacitor 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 to 500m ESR range is suitable in the EUP7907A application circuit. The ESR of a typical 2.2uF ceramic capacitor is about 20m, 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 -40ae to +85ae , 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 25ae to 85ae . Therefore the capacitor type X7R or X5R is recommended in applications where the ambient temperature will change significantly above or below 25ae . 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 170C, 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 30C. For continuous operation, do not exceed absolute maximum operation junction temperature 125C. The power dissipation definition in device is: 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 : (EQ.4) Where TJ(MAX) is the maximum operation junction temperature 125C, TA is the ambient temperature and the JA is the junction to ambient thermal resistance. For recommended operating conditions specification of EUP7907A, where TJ(MAX) is the maximum junction temperature of the die (125C) and TA is the operated ambient temperature. The junction to ambient thermal resistance JA is layout dependent. For SOT-23-5 package, the thermal resistance JA is 220C/W on the standard thermal test board. For TDFN-6 package, the thermal resistance JA is 90C/W on the standard thermal test board. The maximum power dissipation at TA = 25C can be calculated by following formula :
PD ( MAX) = (TJ ( MAX) - TA ) JA
PD ( MAX ) = (125C - 25C) 220 = 0.455 W
for SOT23-5 package
(EQ.5)
(EQ.6) for TDFN-6 package The maximum power dissipation depends on operating ambient temperature for fixed TJ(MAX) and thermal resistance JA. 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.
PD ( MAX ) = (125C - 25C) 90 = 1.111W
Figure 5. Power Dissipation for EUP7907A Packages The EUP7907A is available in two standard packages: TDFN-6 and SOT23-5 packages.
PD = (VIN - VOUT )x I OUT + VIN x I Q
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Packaging Information
SOT23-5
SYMBOLS A A1 D E1 E L b e
MILLIMETERS MIN. MAX. 1.30 0.00 0.15 2.90 1.60 2.60 3.00 0.30 0.60 0.30 0.50 0.95
INCHES MIN. 0.000 0.114 0.063 0.102 0.012 0.012 0.037 0.118 0.024 0.020 MAX. 0.052 0.006
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TDFN-6
DETAIL A
SYMBOLS A A1 b D D1 E E1 e L
MILLIMETERS MIN. MAX. 0.70 0.80 0.00 0.20 1.90 1.40 1.90 0.80 0.65 0.25 0.45 2.10 0.05 0.40 2.10
INCHES MIN. 0.028 0.000 0.008 0.075 0.055 0.075 0.031 0.026 0.010 0.018 0.083 MAX. 0.031 0.002 0.016 0.083
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