Eutech EUP7907A 600ma low noise high psrr low dropout linear regulator Datasheet

EUP7907A
600mA Low Noise High PSRR
Low Dropout Linear Regulator
DESCRIPTION
FEATURES
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.
z
z
z
z
z
z
z
z
z
z
z
z
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: 1.2V ~ 3.6V
Thermal Shutdown
COUT Auto-Discharge when Shutdown
RoHS Compliant and 100% Lead (Fb)-Free
APPLICATIONS
z
z
z
z
Cellular Phones
Bluetooth portable radios and Accessories
battery-Powered Equipment
Laptop, Palmtops, Notebook Compute
Typical Application Circuit
Figure. 1 Fixed Output
DS7907A Ver 1.1 Mar. 2009
1
EUP7907A
Block Diagram
Figure. 2
Pin Configurations
Package Type
Pin Configurations
Package Type
Pin Configurations
TDFN-6
SOT23-5
Pin Description
PIN
SOT23-5 TDFN-6
DESCRIPTION
VIN
1
3
Input Voltage of the LDO.
GND
2
2
EN
3
1
BYPASS
4
6
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.
VOUT
5
4
Output voltage of the LDO.
NC
-
5
No connected.
DS7907A Ver 1.1 Mar. 2009
2
EUP7907A
Ordering Information
Order Number
Package Type
EUP7907A-12VIR1
SOT23-5
EUP7907A-15VIR1
SOT23-5
EUP7907A-18VIR1
SOT23-5
EUP7907A-25VIR1
SOT23-5
EUP7907A-28VIR1
SOT23-5
EUP7907A-33VIR1
SOT23-5
EUP7907A-XXVIR1
SOT23-5
EUP7907A-12JIR1
TDFN-6
EUP7907A-15JIR1
TDFN-6
EUP7907A-18JIR1
TDFN-6
EUP7907A-25JIR1
TDFN-6
EUP7907A-28JIR1
TDFN-6
EUP7907A-33JIR1
TDFN-6
EUP7907A-XXJIR1
TDFN-6
EUP7907A - □ □
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 +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
-40 °C to +85°C
-40 °C to +85°C
-40 °C to +85°C
□ □ □ □
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)
DS7907A Ver 1.1 Mar. 2009
3
EUP7907A
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
Thermal Resistance θJA (TDFN-6) ---------------------------------------------------------------90℃/W
ESD Rating
Human Body Model -------------------------------------------------------------------------2kV
„
„
„
„
„
„
„
„
Recommend 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
EUP7907A
Min.
Typ. Max.
Unit
Input Voltage
VIN
VPORTH
VPORHYS
IQ
ISHDN
PSRR
VFB
Enable
VENH
Input Voltage
POR Threshold
POR hysteresis
Quiescent Current
Shutdown Current
Power Supply Ripple
Rejection
2.5
VEN=VIN, IOUT=0mA
VEN=0V
2.1
0.4
120
0.1
VIN=VNOM+1VP-P,f=1kHz,ILOAD=10mA
70
VIN=VNOM+1VP-P,f=10kHz,ILOAD=10mA
70
0.8
FB Pin Voltage
0.784
Enable High Voltage
Over temperature range
Disable Low Voltage
Over temperature range
IEN
EN Input Current
VIN=5V, VEN=5V or 0V
TST
Start-up Time
CBYPASS=10nF
VENL
5.5
180
1
V
V
V
µA
µA
dB
0.816
1.5
V
V
-1
0.4
V
1
µA
120
µs
Output voltage
VOUT
Output Voltage Accuracy
VLNR
Output Line Regulation
VLDR
Output Load Regulation
Dropout Voltage
(Applied for VOUT≥2.3V)
Maximum Output Current
VDROP
IOUTMAX
DS7907A Ver 1.1 Mar. 2009
VIN=VNOM+1.0V, IOUT=10mA
VIN=VNOM+1.0V, IOUT=10mA,
TEMP=-40℃ to 85℃
VOUT+0.5V<VIN<5.5V, IOUT=10mA
-2
+2
%
-3
+3
%
0.04
0.1
%/V
17
180
360
30
240
450
mV
1 mA <IOUT<600mA, VIN=VNOM+1.0V
IOUT=300mA
IOUT=600mA
600
4
mV
mA
EUP7907A
Electrical Characteristics (continued)
TA=25℃, VIN=VOUT+1V, or VIN=2.5V for VOUT<1.5V unless otherwise specified
Symbol
Parameter
Conditions
EUP7907A
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
DS7907A Ver 1.1 Mar. 2009
5
EUP7907A
Typical Characteristics
DS7907A Ver 1.1 Mar. 2009
6
EUP7907A
Typical Characteristics (continued)
DS7907A Ver 1.1 Mar. 2009
7
EUP7907A
Typical Characteristics (continued)
DS7907A Ver 1.1 Mar. 2009
8
EUP7907A
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 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.
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 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.
DS7907A Ver 1.1 Mar. 2009
9
EUP7907A
Application Information
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 :
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 5mΩ to 500mΩ ESR range is suitable in the
EUP7907A 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 EUP7907A 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
EUP7907A, 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-6 package, the thermal
resistance θJA is 90°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
PD ( MAX ) = (125°C − 25°C) 90 = 1.111W
(EQ.6)
for TDFN-6 package
The maximum power dissipation depends on operating
ambient temperature for fixed TJ(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.
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:
PD = (VIN − VOUT )× I OUT + VIN × I Q
DS7907A Ver 1.1 Mar. 2009
(EQ.5)
for SOT23-5 package
Figure 5. Power Dissipation for EUP7907A Packages
The EUP7907A is available in two standard packages:
TDFN-6 and SOT23-5 packages.
(EQ.3)
10
EUP7907A
Packaging Information
SOT23-5
SYMBOLS
A
A1
D
E1
E
L
b
e
DS7907A Ver 1.1 Mar. 2009
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
11
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
EUP7907A
TDFN-6
DETAIL A
A
MILLIMETERS
MIN.
MAX.
0.70
0.80
MIN.
0.028
MAX.
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
SYMBOLS
D1
E
1.40
1.90
0.055
2.10
0.075
0.083
E1
0.80
0.031
e
0.65
0.026
L
DS7907A Ver 1.1 Mar. 2009
INCHES
0.25
0.45
12
0.010
0.018
Similar pages