Eutech EUP7907-12VIR1 600ma high psrr low dropout linear regulator Datasheet

EUP7907
600mA High PSRR Low Dropout
Linear Regulator
DESCRIPTION
FEATURES
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.
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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 120µA Quiescent Current
Low Shutdown Current:<1µA
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
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Cellular Phones
Bluetooth portable radios and Accessories
battery-Powered Equipment
Laptop, Palmtops, Notebook Computer
Typical Application Circuit
Figure. 1 Adjustable Output
DS7907
Ver 1.1
Oct . 2008
1
EUP7907
Typical Application Circuit (continued)
Figure. 2 Fixed Output
Block Diagram
Figure. 3
DS7907
Ver 1.1
Oct . 2008
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EUP7907
Pin Configurations
Package
Type
Package
Type
Pin Configurations
Pin Configurations
TDFN-8
SOT23-5
Pin Description
PIN
SOT23-5
TDFN-8
VIN
1
1,2
GND
2
6
EN
3
8
FB
4
5
VOUT
5
3,4
NC
--
7
DS7907
Ver 1.1
Oct . 2008
DESCRIPTION
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.
3
EUP7907
Ordering Information
Order Number
Package Type
EUP7907-12VIR1
SOT23-5
EUP7907-15VIR1
SOT23-5
EUP7907-18VIR1
SOT23-5
EUP7907-25VIR1
SOT23-5
EUP7907-28VIR1
SOT23-5
EUP7907-33VIR1
SOT23-5
EUP7907-XXVIR1
SOT23-5
EUP7907-18JIR1
TDFN-8
EUP7907-28JIR1
TDFN-8
EUP7907-33JIR1
TDFN-8
EUP7907-XXJIR1
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 +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
-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
EUP7907 - □ □ □ □ □ □
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)
Note:Every EUP7907 version can operate at adjustable mode by connecting FB pin to an external resistor divider.
DS7907
Ver 1.1
Oct . 2008
4
EUP7907
Absolute Maximum Ratings
VIN,VEN -----------------------------------------------------------------------------------------------0.3 to 6V
VOUT ------------------------------------------------------------------------------------------- -0.3 to (VIN+0.3)
Junction Temperature -------------------------------------------------------------------------------150℃
Storage Temperature Range ----------------------------------------------------------------- -65℃ to +150℃
Lead Temperature -----------------------------------------------------------------------------------260℃
Thermal Resistance θJA (SOT23-5) --------------------------------------------------------------220℃/W
60℃/W
Thermal Resistance θJA (TDFN-8) ---------------------------------------------------------------ESD Rating
Human Body Model -------------------------------------------------------------------------2kV
„
„
„
„
„
„
„
Operating Conditions
VIN --------------------------------------------------------------------------------------------------- 2.5 to 5.5V
VEN --------------------------------------------------------------------------------------------------0 to 5.5V
Operating Temperature Range ---------------------------------------------------------------- -40℃ to +85℃
„
„
„
Electrical Characteristics
TA=25℃, VIN=VOUT+1V, or VIN=2.5V for VOUT<1.5V unless otherwise specified
Symbol
Parameter
Conditions
EUP7907
Min.
Typ. Max.
Unit
Input Voltage
VIN
VPORTH
Input Voltage
2.5
5.5
V
POR Threshold
2.1
V
VPORHYS POR hysteresis
0.4
V
IQ
Quiescent Current
VEN=VIN, IOUT=0mA
120
180
µA
Shutdown Current
Power Supply Ripple
Rejection
FB Pin Voltage
VEN=0V
0.1
1
µA
VIN=VNOM+1VP-P,f=1kHz,ILOAD=10mA
70
VENH
Enable High Voltage
Over temperature range
VENL
Disable Low Voltage
Over temperature range
IEN
EN Input Current
VIN=5V, VEN=5V or 0V
TST
Start-up Time
ISHDN
PSRR
VFB
0.784
0.8
dB
0.816
V
Enable
1.5
V
-1
0.4
V
1
µA
40
µs
Output voltage
VOUT
Output Voltage Accuracy
VLNR
Output Line Regulation
VIN=VNOM+1.0V, IOUT=10mA
VIN=VNOM+1.0V, IOUT=10mA,
TEMP=-40℃ to 85℃
VOUT+0.5V<VIN<5.5V, IOUT=10mA
VLDR
Output Load Regulation
1 mA <IOUT<600mA, VIN=VNOM+1.0V
0.5
VDROP
Dropout Voltage
(Applied for VOUT≥2.3V)
IOUT=300mA
180
240
IOUT=600mA
360
450
IOUTMAX Maximum Output Current
DS7907
Ver 1.1
Oct . 2008
-2
+2
%
-3
+3
%
0.1
%/V
0.04
600
5
%/A
mV
mA
EUP7907
Electrical Characteristics (continued)
TA=25℃, VIN=VOUT+1V, or VIN=2.5V for VOUT<1.5V unless otherwise specified
Symbol
Parameter
Conditions
EUP7907
Min.
Typ. Max.
Unit
Protection
ILIMIT
Current Limit
600
900
mA
Thermal Shutdown
TSD
170
No Load, VIN=VEN=5V
℃
Temperature
Thermal Shutdown
TSDHYS
30
No Load, VIN=VEN=5V
℃
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
DS7907
Ver 1.1
Oct . 2008
6
EUP7907
Typical Characteristics
DS7907
Ver 1.1
Oct . 2008
7
EUP7907
Typical Characteristics (continued)
DS7907
Ver 1.1
Oct . 2008
8
EUP7907
Typical Characteristics (continued)
DS7907
Ver 1.1
Oct . 2008
9
EUP7907
where VREF is the internal reference voltage, which is
0.8V in EUP7907.
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 400Ω 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 ) × VREF
(EQ. 1)
R2
DS7907
Ver 1.1
Oct . 2008
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 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.
10
EUP7907
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:
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
PD = (VIN − VOUT )× I OUT + VIN × I Q
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 :
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
5mΩ to 500mΩ ESR range is suitable in the EUP7907
application circuit. The ESR of a typical 2.2uF ceramic
capacitor is about 20mΩ, 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 EUP7907 will remains stable and in regulation with
no external load. This is special important in CMOS
RAM keep-alive applications.
PD ( MAX) = (TJ ( MAX) − TA ) θ JA
(EQ.4)
Where TJ(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
EUP7907, where TJ(MAX) is the maximum junction
temperature of the die (125°C) and TA is the operated
ambient temperature. The junction to ambient thermal
resistance θJA is layout dependent. For SOT-23-5 package,
the thermal resistance θJA is 220°C/W on the standard
thermal test board. For TDFN-8 package, the thermal
resistance θJA is 60°C/W on the standard thermal test
board. The maximum power dissipation at TA = 25°C can
be calculated by following formula :
PD ( MAX ) = (125°C − 25°C) 220 = 0.455 W
Ver 1.1
Oct . 2008
(EQ.5)
for SOT23-5 package
PD ( MAX ) = (125°C − 25°C) 60 = 1.667 W
(EQ.6)
for TDFN-8 package
The maximum power dissipation depends on operating
ambient temperature for fixed TJ(MAX) and thermal
resistance θJA. 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.
Thermal Considerations
Thermal protection limits power dissipation in
EUP7907.When the operation junction temperature
exceeds 170°C, the OTP circuit starts the thermal
DS7907
(EQ.3)
Figure 5. Power Dissipation for EUP7907 Packages
The EUP7907 is available in two standard packages:
TDFN-8 and SOT23-5 packages.
11
EUP7907
Packaging Information
SOT23-5
SYMBOLS
A
A1
D
E1
E
L
b
e
DS7907
Ver 1.1
Oct . 2008
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
12
INCHES
MIN.
0.000
MAX.
0.052
0.006
0.114
0.063
0.102
0.012
0.012
0.118
0.024
0.020
0.037
EUP7907
TDFN-8
DETAIL A
A
MILLIMETERS
MIN.
MAX.
0.70
0.80
MIN.
0.028
MAX.
0.031
A1
b
D
0.00
0.20
2.90
0.000
0.008
0.114
0.002
0.016
0.122
SYMBOLS
D1
DS7907
Ver 1.1
Oct . 2008
0.05
0.40
3.10
INCHES
2.30
E
E1
e
2.90
L
0.25
0.090
3.10
0.114
1.50
0.65
0.122
0.059
0.026
0.45
13
0.010
0.018
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