EUP7917
300mA, High PSRR Low-Noise LDO
DESCRIPTION
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 battery-
powered 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.
FEATURES
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
APPLICATIONS
Cellular Phones
Bluetooth Portable Radios and Accessories
PDA and Palmtop Computers
Consumer/Personal Electronics
Block Diagram
Figure 1.
DS7917
Ver1.2
Mar. 2008
1
EUP7917
Absolute Maximum Ratings
V
IN
,V
EN
------------------------------------------------------------------------------- -0.3 to 6.5V
V
OUT
----------------------------------------------------------------------------- -0.3 to (V
IN
+0.3)
Junction Temperature --------------------------------------------------------------------- 150°C
Storage Temperature Range ---------------------------------------------------- -65°C to +150°C
Lead Temperature -------------------------------------------------------------------------- 260°C
Thermal Resistance
θ
JA
(SC-70) --------------------------------------------------------- 330°C/W
Thermal Resistance
θ
JA
(SOT23-5) ------------------------------------------------------ 220°C/W
ESD Rating
Human Body Model ---------------------------------------------------------------------- 2kV
Operating Ratings
V
IN
--------------------------------------------------------------------------------------- 2.5 to 6V
V
EN
----------------------------------------------------------------------------------- 0 to (V
IN
+0.3)
Operating Temperature Range ------------------------------------------------- -40°C to +125°C
Electrical Characteristics
Conditions: V
IN
=V
OUT
+0.5V or 2.5V whichever is greater,V
EN
=V
IN
,C
IN
=1uF,C
OUT
=1uF,T
A
=-40~85℃
,Unless otherwise specified.
Symbol
Parameter
Input Voltage
Conditions
I
OUT
=1mA,T
A
=25℃
I
OUT
=1mA,T
A
=-40℃ to 85℃
T
A
>0℃
V
OUT
=V
OUT
(nom)
×
90%, T
A
>0℃
V
OUT
≧3V,
I
OUT
=80mA
V
OUT
≧3V
,I
OUT
=300mA
2.4≦V
OUT
≦3V,I
OUT
=80mA
2.4≦V
OUT
≦3V,I
OUT
=300mA
I
OUT
=0.05mA
V
IN
=V
OUT
(nom)-0.1V,I
OUT
=0mA
V
IN
=(V
OUT
+0.5V) to 6V, I
OUT
=0.1mA
1mA
≤
I
OUT
≤
300mA
V
EN
=0,T
A
=25℃
EUP7917
Min
Typ
Max.
2.5
-2
-3.0
300
300
440
72
250
80
300
70
110
0.02
0.002
0.01
0.05
75
60
45
50
239
200
800
125
350
135
400
160
250
0.25
0.013
1
6
2
3.0
Unit
V
%
mA
mA
∆V
OUT
Output Voltage Accuracy
I
OUTMAX
Maximum Output Current
I
LIMIT
Current Limit
V
DROP
Dropout Voltage (Note1)
mV
I
Q
V
LNR
V
LDR
I
SHDN
Quiescent Current
Line Regulation
Load Regulation
Shutdown Supply Current
µA
%/V
%/mA
µA
PSRR
V
EN
=0,T
A
=85℃
V
IN
=(V
OUT
+1V)DC+0.5V
P-P
f=1kHz, I
LOAD
=10mA
Power Supply Ripple
V
IN
=(V
OUT
+1V)DC+0.5V
P-P
f=10kHz,
Rejection
I
LOAD
=10mA
V
IN
=(V
OUT
+1V)DC+0.5V
P-P
f=100kHz, I
LOAD
=10mA
f=10Hz~100kHz, Fixed-Voltage
Output Noise Voltage (RMS)
I
LOAD
=10mA
Adjustable Voltage
Turn-on Time (Note2)
R
LOAD
=50Ω,T
A
=25℃
dB
µV
µs
DS7917
Ver1.2
Mar. 2008
4
Electrical Characteristics
(continued)
EUP7917
Conditions: V
IN
=V
OUT
+0.5V or 2.5V whichever is greater,V
EN
=V
IN
,C
IN
=1uF,C
OUT
=1uF,T
A
=-40~85℃
,Unless otherwise specified.
VENL (Maximum Low Level
V
ENL
0.4
V
IN
=2.5V to 5.5V
Input Voltage at EN)
VENH (Minimum high Level
V
ENH
1.5
V
IN
=2.5V to 5.5V
Input Voltage at EN)
VEN Input Bias Current
V
IN
=5.5V, V
EN
=0 or 5.5V
1
FB Input Bias Current (ADJ
1
V
IN
=5.5V, V
FB
=1.3V
Version)
FB Pin Voltage (ADJ
V
FB
1.176
1.2
1.224
T
A
=25℃
Version)
Thermal Shutdown
T
SD
155
Temperature
Thermal Shutdown
∆T
SD
15
Hysteresis
Note 1: Dropout is defined as V
IN
-V
OUT
when V
OUT
is 100mV below the value of V
OUT
for V
IN
=V
OUT
+0.5V
Note 2: Test time needed for V
OUT
to reach 90% of final value.
V
V
nA
nA
V
℃
℃
DS7917
Ver1.2
Mar. 2008
5
DSP and ARM Processors
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