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EUP7907
600mA High PSRR Low Dropout Linear Regulator
DESCRIPTION
The EUP7907 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 EUP7907 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 EUP7907 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 EUP7907 detects fault signal, such as over-temperature, it will turn off the pass transistor and discharge VOUT to GND from the internal resistor. EUP7907 can be operated in two modes, operated in fixed mode when the FB pin connected to ground, its output is a pre-set value:0.8V~3.6V. There is no external component needed to decide the output voltage. Operated in adjustable mode when the FB pin connected to two external resistors divider, its output can be adjusted from 0.8V to 5V. Other key features include over-current protection, thermal shutdown. The device can be available in the TDFN-8 package or SOT23-5 package.
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: 0.8V ~ 3.6V Adjustable Output Voltage: 0.8V to 5V 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 Computer
Typical Application Circuit
Figure. 1 Adjustable Output
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Typical Application Circuit (continued)
Figure. 2 Fixed Output
Block Diagram
Figure. 3
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Pin Configurations
Package Type Pin Configurations Package Type Pin Configurations
SOT23-5
TDFN-8
Pin Description
PIN VIN GND EN FB VOUT NC SOT23-5 1 2 3 4 5 -TDFN-8 1,2 6 8 5 3,4 7 Input Voltage of the LDO. Signal Ground. Enable Pin. Connect this pin to ground or less than 0.4V to disable the device. Active-high for EUP7907. Feedback pin. This pin is the anode terminal of the error amplifier. The FB pin compares with internal reference voltage to regulate the output voltage. Connect to GND for fixed output voltage version. Output voltage of the LDO. Not connected. DESCRIPTION
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Ordering Information
Order Number EUP7907-12VIR1 EUP7907-15VIR1 EUP7907-18VIR1 EUP7907-25VIR1 EUP7907-28VIR1 EUP7907-33VIR1 EUP7907-XXVIR1 EUP7907-18JIR1 EUP7907-28JIR1 EUP7907-33JIR1 EUP7907-XXJIR1 Package Type SOT23-5 SOT23-5 SOT23-5 SOT23-5 SOT23-5 SOT23-5 SOT23-5 TDFN-8 TDFN-8 TDFN-8 TDFN-8 Marking xxxxx AC1T xxxxx AC1C xxxxx AC1D xxxxx AC1B xxxxx AC1E xxxxx AC1H xxxxx xxxx xxxxx P7907 1D xxxxx P7907 1E xxxxx P7907 1H xxxxx P7907 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
EUP7907 - 1/4
1/4
1/4
1/4
1/4
1/4
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-8 Output Voltage 12:1.2V 15:1.5V 18:1.8V 25:2.5V 28:2.8V 33:3.3V XX: Voltage Options (0.8V~3.6V, 0.05V per step) NoteG Every EUP7907 version can operate at adjustable mode by connecting FB pin to an external resistor divider.
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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 60J /W Thermal Resistance JA (TDFN-8) ---------------------------------------------------------------ESD Rating Human Body Model -------------------------------------------------------------------------2kV
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 Quiescent Current Shutdown Current Power Supply Ripple Rejection FB Pin Voltage Enable High Voltage Disable Low Voltage EN Input Current Start-up Time
Conditions
EUP7907 Min. Typ. Max.
2.5 2.1 0.4 5.5
Unit
V V
VIN VPORTH IQ ISHDN PSRR VFB Enable VENH VENL IEN TST
VPORHYS POR hysteresis VEN=VIN, IOUT=0mA VEN=0V VIN=VNOM+1VP-P,f=1kHz,ILOAD=10mA 0.784 Over temperature range Over temperature range VIN=5V, VEN=5V or 0V -1 1.5
V 180 1 A A dB 0.816 V V 0.4 1 V A s +2 +3 % % %/V %/A 240 450 mV mA
120 0.1 70 0.8
40 VIN=VNOM+1.0V, IOUT=10mA VIN=VNOM+1.0V, IOUT=10mA, TEMP=-40ae to 85ae VOUT+0.5VOutput voltage VOUT VLNR VLDR VDROP Output Voltage Accuracy Output Line Regulation Output Load Regulation Dropout Voltage (Applied for VOUT2.3V)
0.1
IOUTMAX 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
EUP7907 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 EUP7907 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 EUP7907 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 EUP7907 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. 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. Adjustable Output Voltage EUP7907 has a wide output voltage range. The output voltage is programmed using an external resistor divider as shown in Figure 4. The output voltage can be calculated by the following equation: R VOUT = (1 + 1 ) x VREF (EQ. 1) R2
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where VREF is the internal reference voltage, which is 0.8V in EUP7907.
Figure 4. Output Voltage Select Circuit Current Limit The EUP7907 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 EUP7907 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
Resistors Select Choose R2=100k to optimize accuracy, power supply rejection, noise and power consumption. And the R1 can be chosen by: V R1 = R 2 ( OUT - 1) (EQ. 2) VREF where VREF is the internal reference voltage, which is 0.8V in EUP7907. External Capacitor Like other low-dropout regulator, the EUP7907 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 EUP7907 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 EUP7907 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 EUP7907 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 EUP7907.When the operation junction temperature exceeds 170C, the OTP circuit starts the thermal
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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:
PD = (VIN - VOUT )x I OUT + VIN x I Q
(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 : (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 EUP7907, 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-8 package, the thermal resistance JA is 60C/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-8 package The maximum power dissipation depends on operating ambient temperature for fixed TJ(MAX) and thermal resistance JA. For EUP7907 packages, the Figure 5 of derating curves allows the designer to see the effect of rising ambient temperature on the maximum power allowed.
PD ( MAX ) = (125C - 25C) 60 = 1.667 W
Figure 5. Power Dissipation for EUP7907 Packages The EUP7907 is available in two standard packages: TDFN-8 and SOT23-5 packages.
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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-8
DETAIL A
SYMBOLS A A1 b D D1 E E1 e L
MILLIMETERS MIN. MAX. 0.70 0.80 0.00 0.20 2.90 2.30 2.90 1.50 0.65 0.25 0.45 3.10 0.05 0.40 3.10
INCHES MIN. 0.028 0.000 0.008 0.114 0.090 0.114 0.059 0.026 0.010 0.018 0.122 MAX. 0.031 0.002 0.016 0.122
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