Eutech EUP7917-28VIR1 300ma, high psrr low-noise ldo Datasheet

EUP7917
300mA, High PSRR Low-Noise LDO
DESCRIPTION
FEATURES
The EUP7917 is an efficient, CMOS voltage regulator
optimized for ultra-low-noise applications. It offers
high output accuracy, extremely low dropout voltage
low ground current and fast start-up time.
The EUP7917 provides a very low noise output, ideal
for RF applications where a clean voltage source is
required. A noise bypass pin is also available for
further reduction of output noise.
Designed specifically for handheld and batterypowered devices, the EUP7917 provides a
TTL-logic-compatible enable pin. When disabled,
power consumption drops nearly to zero.
The EUP7917 also works with low-ESR ceramic
capacitors, reducing the amount of board space
necessary for power applications, critical in handheld
wireless devices.
Available in the SC-70 and SOT23-5 package, the
EUP7917 offers a wide range of output voltages. Key
features include current limit, thermal shutdown and
faster transient response.
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APPLICATIONS
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Block Diagram
Figure 1.
DS7917
Ver1.2
Mar. 2008
Space-Saving 5-pin SC-70 Package
2.5V to 6V Input Voltage Range
50µV(rms) Output Noise
250mV Dropout @ 300mA
75dB PSRR at 1kHz
Low 70µA Ground Current
Up to 300mA Output Current
Stability with 1µF Ceramic Output Capacitors
Excellent Load/Line Transient
Thermal Shutdown and Current Limit
Protection
Available in 1.2V,1.3V,1.5V,1.8V,1.85V,
2.5V,2.8V,2.85V, 2.9V,3.0V,3.3V,3.5V,4.8V
and Adjustable Voltages
RoHS Compliant and 100% Lead (Pb)-Free
1
Cellular Phones
Bluetooth Portable Radios and Accessories
PDA and Palmtop Computers
Consumer/Personal Electronics
EUP7917
Typical Application Circuit
Figure 2. Fixed-Voltage LDO Regulator
Pin Configurations
Package Type
Pin
Configurations
SC-70
SOT23-5
Fixed-Voltage
Adjustable Voltage
Pin Description
PIN
PIN
VIN
1
Input voltage of the LDO
GND
2
Common ground
VEN
3
Enable input logic, enable high
BYPASS
ADJ
VOUT
DS7917
Ver1.2
4
5
Mar. 2008
DESCRIPTION
Optional bypass capacitor for noise reduction
Adjustable regulator feedback input. Connect to resistor divider.
Output voltage of the LDO
2
EUP7917
Ordering Information
Order Number
Package Type
Marking
Operating Temperature range
EUP7917-12NIR1
EUP7917-13NIR1
EUP7917-15NIR1
EUP7917-18NIR1
EUP7917-185NIR1
EUP7917-25NIR1
EUP7917-28NIR1
EUP7917-285NIR1
EUP7917-29NIR1
EUP7917-30NIR1
EUP7917-33NIR1
EUP7917-35NIR1
EUP7917-48NIR1
EUP7917NIR1
EUP7917-12VIR1
EUP7917-13VIR1
EUP7917-15VIR1
EUP7917-18VIR1
EUP7917-185VIR1
EUP7917-25VIR1
EUP7917-28VIR1
EUP7917-285VIR1
EUP7917-29VIR1
EUP7917-30VIR1
EUP7917-33VIR1
EUP7917-35VIR1
EUP7917-48VIR1
EUP7917VIR1
SC-70
SC-70
SC-70
SC-70
SC-70
SC-70
SC-70
SC-70
SC-70
SC-70
SC-70
SC-70
SC-70
SC-70
SOT23-5
SOT23-5
SOT23-5
SOT23-5
SOT23-5
SOT23-5
SOT23-5
SOT23-5
SOT23-5
SOT23-5
SOT23-5
SOT23-5
SOT23-5
SOT23-5
pT xx
pX xx
pC xx
pD xx
pU xx
pB xx
pE xx
pF xx
pW xx
pG xx
pH xx
pR xx
pK xx
pA xx
pT xxxx
pX xxxx
pC xxxx
pD xxxx
pU xxxx
pB xxxx
pE xxxx
pF xxxx
pW xxxx
pG xxxx
pH xxxx
pR xxxx
pK xxxx
pA xxxx
-40 °C to 125°C
-40 °C to 125°C
-40 °C to 125°C
-40 °C to 125°C
-40 °C to 125°C
-40 °C to 125°C
-40 °C to 125°C
-40 °C to 125°C
-40 °C to 125°C
-40 °C to 125°C
-40 °C to 125°C
-40 °C to 125°C
-40 °C to 125°C
-40 °C to 125°C
-40 °C to 125°C
-40 °C to 125°C
-40 °C to 125°C
-40 °C to 125°C
-40 °C to 125°C
-40 °C to 125°C
-40 °C to 125°C
-40 °C to 125°C
-40 °C to 125°C
-40 °C to 125°C
-40 °C to 125°C
-40 °C to 125°C
-40 °C to 125°C
-40 °C to 125°C
EUP7917- □□□ □ □ □ □
Lead Free Code
1: Lead Free 0: Lead
Packing
R: Tape & Reel
Operating temperature range
I: Industry Standard
Package Type
N: SC-70 V: SOT-23
Output Voltage
12:1.2V
13:1.3V
185:1.85V 25:2.5V
285:2.85V 29:2.9V
33:3.3V
35:3.5V
DS7917
Ver1.2
Mar. 2008
3
15:1.5V 18:1.8V
28:2.8V
30:3.0V
48:4.8V Blank: Adjustable
EUP7917
Absolute Maximum Ratings
„
„
„
„
„
„
„
„
VIN,VEN ------------------------------------------------------------------------------- -0.3 to 6.5V
VOUT ----------------------------------------------------------------------------- -0.3 to (VIN+0.3)
Junction Temperature --------------------------------------------------------------------- 150°C
Storage Temperature Range ---------------------------------------------------- -65°C to +150°C
Lead Temperature -------------------------------------------------------------------------- 260°C
Thermal Resistance θJA(SC-70) --------------------------------------------------------- 330°C/W
Thermal Resistance θJA(SOT23-5) ------------------------------------------------------ 220°C/W
ESD Rating
Human Body Model ---------------------------------------------------------------------- 2kV
Operating Ratings
„
„
„
VIN --------------------------------------------------------------------------------------- 2.5 to 6V
VEN ----------------------------------------------------------------------------------- 0 to (VIN+0.3)
Operating Temperature Range ------------------------------------------------- -40°C to +125°C
Electrical Characteristics
Conditions: VIN=VOUT+0.5V or 2.5V whichever is greater,VEN=VIN,CIN=1uF,COUT=1uF,TA=-40~85℃
,Unless otherwise specified.
Symbol
Parameter
Conditions
Input Voltage
∆VOUT
Output Voltage Accuracy
IOUTMAX Maximum Output Current
ILIMIT
VDROP
IQ
Current Limit
Dropout Voltage (Note1)
Quiescent Current
Min
EUP7917
Typ
Max.
IOUT=1mA,TA=25℃
2.5
-2
6
2
IOUT=1mA,TA=-40℃ to 85℃
-3.0
3.0
TA>0℃
300
VOUT=VOUT(nom) × 90%, TA>0℃
300
Unit
V
%
mA
440
800
VOUT≧3V, IOUT=80mA
72
125
VOUT≧3V ,IOUT=300mA
250
350
2.4≦VOUT≦3V,IOUT=80mA
80
135
2.4≦VOUT≦3V,IOUT=300mA
300
400
IOUT=0.05mA
70
160
VIN=VOUT (nom)-0.1V,IOUT=0mA
110
250
mA
mV
µA
VLNR
Line Regulation
VIN=(VOUT+0.5V) to 6V, IOUT=0.1mA
0.02
0.25
%/V
VLDR
Load Regulation
1mA ≤ IOUT ≤ 300mA
0.002
0.013
%/mA
ISHDN
Shutdown Supply Current
VEN=0,TA=25℃
0.01
1
PSRR
VEN=0,TA=85℃
VIN=(VOUT+1V)DC+0.5VP-P
f=1kHz, ILOAD=10mA
Power Supply Ripple
VIN=(VOUT+1V)DC+0.5VP-P f=10kHz,
Rejection
ILOAD=10mA
VIN=(VOUT+1V)DC+0.5VP-P
f=100kHz, ILOAD=10mA
f=10Hz~100kHz, Fixed-Voltage
Output Noise Voltage (RMS)
ILOAD=10mA
Adjustable Voltage
Turn-on Time (Note2)
DS7917
Ver1.2
Mar. 2008
RLOAD=50Ω,TA=25℃
4
0.05
µA
75
dB
60
45
50
µV
239
200
µs
EUP7917
Electrical Characteristics (continued)
Conditions: VIN=VOUT+0.5V or 2.5V whichever is greater,VEN=VIN,CIN=1uF,COUT=1uF,TA=-40~85℃
,Unless otherwise specified.
VENL (Maximum Low Level
VENL
0.4
VIN=2.5V to 5.5V
Input Voltage at EN)
VENH (Minimum high Level
VENH
1.5
VIN=2.5V to 5.5V
Input Voltage at EN)
VEN Input Bias Current
VIN=5.5V, VEN=0 or 5.5V
1
FB Input Bias Current (ADJ
1
VIN=5.5V, VFB=1.3V
Version)
FB Pin Voltage (ADJ
VFB
1.176
1.2
1.224
TA=25℃
Version)
Thermal Shutdown
TSD
155
Temperature
Thermal Shutdown
∆TSD
15
Hysteresis
Note 1: Dropout is defined as VIN-VOUT when VOUT is 100mV below the value of VOUT for VIN=VOUT+0.5V
Note 2: Test time needed for VOUT to reach 90% of final value.
DS7917
Ver1.2
Mar. 2008
5
V
V
nA
nA
V
℃
℃
EUP7917
Typical Operating Characteristics
OUTPUT VOLTAGE ACCURACY vs. lOAD CURRENT
OUTPUT VOLTAGE vs. INPUT VOLTAGE
3.0
0.6
0.4
IOUT=0mA
DEVIATION (%)
OUTVOLTAGE (V)
2.5
2.0
IOUT=300mA
1.5
1.0
0.5
0.2
0.0
-0.2
-0.4
0.0
-0.6
0
1
2
3
4
5
6
0
50
INPUTVOLTAGE (V)
250
300
DROPOUT VOLTAGE vs. LOAD CURRENT
OUTPUT VOLTAGE ACCURACY vs. TEMPERATURE
350
DROPOUT VOLTAGE (mV)
0.8
IOUT=1mA
0.4
DEVIATION (%)
100
150
200
LOAD CURRENT (mA)
0.0
-0.4
300
TEMP=85
250
TEMP=25
200
150
100
TEMP=-40
50
0
-0.8
-40
0
-15
10
35
60
50
85
100
150
200
250
300
LOAD CURRENT (mA)
o
Temperature ( C)
GROUND CURRENT vs. INPUT VOLTAGE
GROUND CURRENT vs. LOAD CURRENT
240
200
IOUT=300mA
GROUND CURRENT (uA)
GROUND CURRENT (uA)
240
160
IOUT=0mA
120
80
40
0
200
VIN=5.5V
160
120
VIN=3.3V
80
40
0
0
1
2
3
4
5
6
0
Ver1.2
Mar. 2008
100
150
200
LOAD CURRENT (mA)
INPUT VOLTAGE (V)
DS7917
50
6
250
300
EUP7917
GROUND CURRENT vs. TEMPERATURE
GROUND CURRENT (uA)
120
100
80
60
40
20
0
-40
DS7917
-20
Ver1.2
0
20
40
60
80
o
TEMPERATURE ( C)
Mar. 2008
100 120 140
7
EUP7917
DS7917
Ver1.2
Mar. 2008
8
EUP7917
Application Note
capacitance can drop by more than 50% as the
temperature goes from 25°C to 85°C. Therefore, X7R
is recommended over Z5U and Y5V in applications
where the ambient temperature will change
significantly above or below 25°C.
External Capacitors
Like any low-dropout regulator, the EUP7917 requires
external capacitors for regulator stability. The
EUP7917 is specifically designed for portable
applications requiring minimum board space and
smallest components. These capacitors must be
correctly selected for good performance.
Noise Bypass Capacitor
Connecting a 0.01µF capacitor between the CBYPASS
pin and ground significantly reduces noise on the
regulator output. This cap is connected directly to a
high impedance node in the bandgap reference circuit.
Any significant loading on this node will cause a
change on the regulated output voltage. For this reason,
DC leakage current through this pin must be kept as
low as possible for best output voltage accuracy. The
types of capacitors best suited for the noise bypass
capacitor are ceramic and film.
Unlike many other LDO’s, addition of a noise
reduction capacitor does not effect the load transient
response of the device.
Input Capacitor
An input capacitance of 1µF is required between the
EUP7917 input pin and ground (the amount of the
capacitance may be increased without limit).
This capacitor must be located a distance of not more
than 1cm from the input pin and returned to a clean
analog ground. Any good quality ceramic, tantalum, or
film capacitor may be used at the input.
If a tantalum capacitor is used at the input, it must be
guaranteed by the manufacturer to have a surge current
rating sufficient for the application.
There are no requirements for the ESR on the input
capacitor, but tolerance and temperature coefficient
must be considered when selecting the capacitor to
ensure the capacitance will be 1µF over the entire
operating temperature range.
Adjustable Operation
The adjustable version of the EUP7917 has an output
voltage range of 1.2V to 4.5V. The output voltage of
the EUP7917 adjustable regulator is programmed
using an external resistor divider as shown in Figure3.
The output voltage is calculated using:
Output Capacitor
The EUP7917 is designed specifically to work with
very small ceramic output capacitors. A ceramic
capacitor (temperature characteristics X7R, X5R, Z5U,
or Y5V) in 1 to 22µF range with 5mΩ to 500mΩ ESR
range is suitable in the EUP7917 application circuit.
The output capacitor must meet the requirement for
minimum amount of capacitance and also have an
ESR (Equivalent Series Resistance) value which is
within a stable range (5mΩ to 500mΩ)
V =V
O
Mar. 2008
R
R
1)
2
Utilize the following equation for adjusting the output
to a particular voltage:
V

R 1 = R 2  O − 1
1.2V 
Choose R2=50k to optimize accuracy, power supply
rejection, noise and power consumption.
Capacitor Characteristics
The EUP7917 is designed to work with ceramic
capacitors on the output to take advantage of the
benefits they offer: for capacitance values in the range
of 1µF to 4.7µF range, ceramic capacitors are the
smallest, least expensive and have the lowest ESR
values (which makes them best for eliminating high
frequency noise). The ESR of a typical 1µF ceramic
capacitor is in the range of 20mΩ to 40mΩ, which
easily meets the ESR requirement for stability by the
EUP7917.
The ceramic capacitor’s capacitance can vary with
temperature. The capacitor type X7R, which operates
over a temperature range of -55°C to +125°C, will
only vary the capacitance to within ±15%. Most large
value ceramic capacitors ( ≈ 2.2µF) are manufactured
with Z5U or Y5V temperature characteristics. Their
Ver1.2
× (1 +
Where:
Vref= 1.2V typ. (the internal reference voltage)
No-Load Stability
The EUP7917 will remain stable and in regulation
with no external load. This is specially important in
CMOS RAM keep-alive applications.
DS7917
ref
Figure3. Adjustable Regulator with Resistors
9
EUP7917
On/Off Input Operation
The EUP7917 is turned off by pulling the VEN pin low,
and turned on by pulling it high. If this feature is not
used, the VEN pin should be tied to VIN to keep the
regulator output on at all time. To assure proper
operation, the signal source used to drive the VEN
input must be able to swing above and below the
specified turn-on/off voltage thresholds listed in the
Electrical Characteristics section under VIL and VIH.
Fast Start up
The EUP7917 output starts up after Vref voltage
reaches its final value (1.2V nomial). The start-up time
is determined by the time constant of the bypass
capacitor. The smaller the capacitor value, the shorter
the start-up time, but less noise gets reduced. As a
result, start-up time and noise reduction need to be
taken into design consideration when choosing the
value of the bypass capacitor.
Thermal Considerations
Thermal protection limits power dissipation in
EUP7917.When the operation junction temperature
exceeds 155°C, the OTP circuit starts the thermal
shutdown function turn the pass element off. The pass
element turn on again after the junction temperature
cools by 15°C. For continue 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
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 :
PD (MAX) =
(TJ(MAX) - TA )
θ JA
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
EUP7917, where TJ(MAX) is the maximum junction
temperature of the die (125°C) and TA is the maximum
ambient temperature. The junction to ambient thermal
resistance (θJA is layout dependent) only for SC-70
package is 330°C/W on standard thermal test board.
The maximum power dissipation at TA = 25°C can be
calculated by following formula :
PD (MAX) = (125°C − 25°C ) / 330 = 300 mW (SC − 70)
The maximum power dissipation depends on operating
ambient temperature for fixed TJ(MAX) and thermal
resistance θJA.
DS7917
Ver1.2
Mar. 2008
10
EUP7917
Packaging Information
SC-70
SYMBOLS
A
A1
b
D
E
E1
e
L
DS7917
Ver1.2
Mar. 2008
MILLIMETERS
MIN.
MAX.
0.80
1.10
0.025
0.10
0.15
0.40
2.00
1.25
1.90
2.30
0.65
0.21
0.46
11
INCHES
MIN.
0.031
0.001
0.006
MAX.
0.044
0.004
0.016
0.079
0.049
0.075
0.091
0.026
0.008
0.018
EUP7917
SOT23-5
SYMBOL
S
A
A1
D
E1
E
L
b
e
DS7917
Ver1.2
Mar. 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
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