EUP7981-185NIR1 [EUTECH]
150mA Low-Noise LDO in SC-70; 150毫安低噪声LDO的SC- 70
| 型号： | EUP7981-185NIR1 |
| 厂家： | 
EUTECH MICROELECTRONICS INC |
| 描述： | 150mA Low-Noise LDO in SC-70 |
| 文件： | 总10页 (文件大小：227K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
EUP7981
150mA Low-Noise LDO in SC-70
DESCRIPTION
FEATURES
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Space-Saving 5-pin SC-70 Package
2.5V to 5.5V Input Voltage Range
50µV(rms) Output Noise
140mV Dropout @ 150mA
75dB PSRR at 1kHz
Low 70µA Ground Current
150mA Output Current
The EUP7981 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 EUP7981 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 battery-
Stability with 1µF Ceramic Output Capacitors
Excellent Load/Line Transient
powered devices, the EUP7981 provides
a
TTL-logic-compatible enable pin. When disabled,
power consumption drops nearly to zero.
Thermal Shutdown and Current Limit
The EUP7981 also works with low-ESR ceramic
capacitors, reducing the amount of board space
necessary for power applications, critical in handheld
wireless devices.
Protection
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Available in 1.5V,1.8V,1.85V,2.5V,2.8V,2.85V,
3.0V ,3.3V and Adjustable Voltages
RoHS Compliant and 100% Lead (Pb)-Free
Available in the SC-70 package, the EUP7981 offers a
wide range of output voltages. Key features include
current limit, thermal shutdown and faster transient
response.
APPLICATIONS
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Cellular Phones
Bluetooth Portable Radios and Accessories
PDA and Palmtop Computers
Consumer/Personal Electronics
Block Diagram
Figure 1.
DS7981 Ver1.0 Jan. 2008
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EUP7981
Typical Application Circuit
Figure 2.
Pin Configurations
Package Type
Pin Configurations
SC-70
Pin Description
PIN
VIN
PIN
DESCRIPTION
1
2
3
Input voltage of the LDO
GND
VEN
Common ground
Enable input logic, enable high
BYPASS
ADJ
Optional bypass capacitor for noise reduction
4
5
Adjustable regulator feedback input. Connect to resistor divider.
Output voltage of the LDO
VOUT
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EUP7981
Ordering Information
Order Number
EUP7981-15NIR1
EUP7981-18NIR1
EUP7981-185NIR1
EUP7981-25NIR1
EUP7981-28NIR1
EUP7981-285NIR1
EUP7981-30NIR1
EUP7981-33NIR1
EUP7981NIR1
Package Type
SC-70
Marking
MC □ □
MD □ □
MU □ □
MB □ □
ME □ □
MF □ □
MG □ □
MH □ □
MA □ □
Operating Temperature range
-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
SC-70
SC-70
SC-70
SC-70
SC-70
SC-70
SC-70
SC-70
EUP7981- □□□ □ □ □ □
Lead Free Code
1: Lead Free 0: Lead
Packing
R: Tape & Reel
Operating temperature range
I: Industry Standard
Package Type
N: SC-70
Output Voltage
15: 1.5V
18: 1.8V
185:1.85V
25: 2.5V
28: 2.8V
285: 2.85V
30: 3.0V
33: 3.3V
Blank: Adjustable
Absolute Maximum Ratings
VIN,VEN ------------------------------------------------------------------------------- -0.3 to 6V
VOUT ----------------------------------------------------------------- -0.3 to (VIN+0.3) ≦ 6V
Junction Temperature --------------------------------------------------------------------- 150°C
Storage Temperature Range ---------------------------------------------------- -65°C to +150°C
Lead Temperature -------------------------------------------------------------------------- 260°C
Maximum Power Dissipation SC-70 ----------------------------------------------------
0.3W
Thermal Resistance θJA(SC-70) --------------------------------------------------------- 320°C/W
ESD Rating
Human Body Model --------------------------------------------------------------------- 2kV
Operating Ratings
VIN -------------------------------------------------------------------------------------- 2.5 to 5.5V
VEN ------------------------------------------------------------------------- 0 to (VIN+0.3)≦ 5.5V
Operating Temperature Range ------------------------------------------------- -40°C to +125°C
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EUP7981
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.
EUP7981
Symbol
Parameter
Conditions
Unit
Min
2.5
-2
Typ
Max.
5.5
Input Voltage
V
%
%
IOUT=1mA,TA=25℃
OUT=1mA,TA=-40℃ to 85℃
2
3
∆VOUT Output Voltage Accuracy
I
-3
IOUTMAX Maximum Output Current
ILIMIT Current Limit
VDROP Dropout Voltage (Note1)
TA>0℃
150
150
mA
mA
mV
µA
VOUT=VOUT(nom) 90%, T >0℃
IOUT=150mA
IOUT=1mA
220
140
70
400
240
160
×
A
IQ
Quiescent Current
VIN=(VOUT+0.5V) to 5.5V,
IOUT=1mA
VLNR Line Regulation
0.02
0.25
%/V
VLDR Load Regulation
ISHDN Shutdown Supply Current
1mA I
150mA
0.002
0.013
1
%/mA
µA
≤
≤
OUT
VEN=0,TA=25℃
VIN=(VOUT+1V)DC+0.5VP-P
PSRR Power Supply Ripple Rejection
75
dB
f=1kHz, ILOAD=10mA
Output Noise Voltage (Bypass) f=10Hz~100kHz, ILOAD=10mA
50
239
µV
µV
µs
Output Noise Voltage (ADJ)
Turn-on Time (Note2)
f=10Hz~100kHz, ILOAD=10mA
RLOAD=50Ω,TA=25℃
200
0.4
VENL (Maximum Low Level
VENL
VENH
VIN=2.5V to 5.5V
V
Input Voltage at EN)
VENH (Minimum high Level
Input Voltage at EN)
VEN Input Bias Current
VIN=2.5V to 5.5V
VIN=5.5V, VEN=0 or 5.5V
VIN=5.5V, VFB=1.3V
TA=25℃
1.5
V
1
1
nA
nA
FB Input Bias Current (ADJ
Version)
VFB
TSD
FB Pin Voltage (ADJ Version)
Thermal Shutdown Temperature
1.176
1.2
155
15
1.224
V
℃
∆TSD Thermal Shutdown Hysteresis
℃
Note 1: Dropout is defined as VIN-VOUT when VOUT is 100mV below the value of VOUT for VIN=VOUT+0.6V
Note 2: Test time needed for VOUT to reach 90% of final value.
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EUP7981
Typical Operating Characteristics
OUTPUT VOLTAGE ACCURACY vs. LOAD CURRENT
OUTPUT VOLTAGE vs. INPUT VOLTAGE
3.0
0.4
2.5
0.2
0.0
IOUT=0mA
2.0
1.5
1.0
-0.2
-0.4
IOUT=120mA
0.5
0.0
0
20
40
60
80
100
120
0
1
2
3
4
5
6
LOAD CURRENT (mA)
INPUT VOLTAGE (V)
DROPOUT VOLTAGE vs. LOAD CURRENT
OUTPUT VOLTAGE ACCURACY vs. TEMPERATURE
120
80
40
0
0.8
Temp=85oC
Temp=25oC
IOUT=1mA
0.4
0.0
-0.4
-0.8
Temp=-40oC
0
20
40
60
80
100
120
-40
-15
10
35
60
85
Temperature (oC)
LOAD CURRENT (mA)
GROUND CURRENT vs. INPUT VOLTAGE
IOUT=120mA
GROUND CURRENT vs. LOAD CURRENT
200
200
160
120
80
160
120
80
Vin=5.5V
Vin=3.3V
IOUT=0mA
40
40
0
0
0
1
2
3
4
5
6
0
20
40
60
80
100
120
INPUT VOLTAGE (V)
LOAD CURRENT (mA)
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EUP7981
GROUND CURRENT vs. TEMPERATURE
120
100
80
60
40
20
0
-40 -20
0
20 40 60 80 100 120 140
TEMPERATURE (oC)
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EUP7981
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EUP7981
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 EUP7981 requires
external capacitors for regulator stability. The
EUP7981 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.
Input Capacitor
An input capacitance of 1µF is required between the
EUP7981 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 asurge current
rating sufficient for the application.
Unlike many other LDO’s, addition of a noise
reduction capacitor does not effect the load transient
response of the device.
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 EUP7981 has an output
voltage range of 1.2V to 4.5V. The output voltage of
the EUP7981 adjustable regulator is programmed
using an external resistor divider as shown in Figure3.
The output voltage is calculated using:
Output Capacitor
The EUP7981 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 EUP7981 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)
R
R
1
V = V ×(1+
)
O
ref
2
Where:
Vref= 1.2V typ. (the internal reference voltage)
Utilize the following equation for adjusting the output
to a particular voltage:
No-Load Stability
V
1.2V
O
The EUP7981 will remain stable and in regulation
with no external load. This is specially important in
CMOS RAM keep-alive applications.
P = R
−1
I
2
Capacitor Characteristics
Choose R2=50k to optimize accuracy, power supply
rejection, noise and power consumption.
The EUP7981 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
EUP7981.
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
≈
Figure3. Adjustable Regulator with Resistors
with Z5U or Y5V temperature characteristics. Their
DS7981 Ver1.0 Jan. 2008
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EUP7981
On/Off Input Operation
The EUP7981 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 EUP7981 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.
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EUP7981
Packaging Information
SC-70
MILLIMETERS
INCHES
SYMBOLS
MIN.
0.80
MAX.
1.10
MIN.
0.031
0.001
0.006
MAX.
A
A1
b
0.044
0.004
0.016
0.025
0.15
0.10
0.40
D
E
2.00
1.25
0.079
0.049
E1
e
1.90
0.21
2.30
0.46
0.075
0.008
0.091
0.018
0.65
0.026
L
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