150mA CMOS Low Noise
LDO Voltage Regulator
(Preliminary)
Description
The SE5508 series of fixed output low dropout
linear regulators are designed for portable battery
powered applications, which require low noise
environment, fast enable response time, and low
dropout voltage. An optional bypass capacitor can
be added for better low-noise performance. Each
device contains a voltage reference unit, an error
amplifier, a PMOS power transistor, and resistors
for setting output voltage, and current limit and
temperature limit protection circuits.
The SE5508 has been designed to be used with low
cost capacitors and requires a minimum output
capacitor of 1.0μF. Standard voltage versions are
1.5, 1.8, 2.5, 2.8, 3.0, and 3.3V.
SE5508
Features
Excellent Noise Rejection at 62 dB.
Typical Low Dropout Voltage of 200mV at
75mA.
Fast Enable Turn-On Time of 20μs (Typ.)
Excellent Line and Load Regulation.
High Accuracy Output Voltage of 2%.
Typical Low Ground Current at 50μA
Typical Disable Current Less than 0.1μA
Thermal Protection.
Standard SOT23-5L and SC70 (SOT353)
Package.
Available in Lead-Free Packages.
Applications
Cellphones.
Wireless LAN’s.
Hand-Held Instrumentation.
Portable Video Game Devices.
Digital Cameras.
Pin Configuration
Ordering Information
SE5508
_
__
Pin (1=>5):
G: V
IN
/GND/EN/BYPASS/V
OUT
Package: L: SOT-23-5L
P: SC70 (SOT353)
Output Voltage: A: V
OUT
= 3.3V
B: V
OUT
= 2.8V
C: V
OUT
= 2.5V
D: V
OUT
= 1.8V
E: V
OUT
= 1.5V
F: V
OUT
= 3.0V
Preliminary and all contents are subject to change without prior notice.
© Seaward Electronics, Inc., 2005. • www.seawardinc.com.cn • Page 1
150mA CMOS Low Noise
LDO Voltage Regulator
(Preliminary)
Absolute Maximum Rating
(1)
Parameter
Input Voltage
Enable Voltage
Output Voltage
Power Dissipation
Output Short Circuit Duration
Thermal Resistance,
Junction-to-Ambient
Lead Temperature (Soldering,
5 sec.)
Junction Temperature
Storage Temperature
T
J
T
S
Θ
JA
Symbol
V
IN
V
EN
V
OUT
P
D
Value
6
-0.3 to V
IN
-0.3 to V
IN
Internally
Limited
(3)
Infinite
230
°C/W
Units
V
V
V
SE5508
260
0 to +150
-40 to +150
°C
°C
°C
Operating Rating
(2)
Parameter
Supply Input Voltage
Junction Temperature
Symbol
V
IN
T
J
Value
+2.0V to +5.5
0 to +125
Units
V
°C
Electrical Characteristics
V
IN
= 5V; C
IN
= 2.2μF; C
OUT
= 2.21μF; I
OUT
= 10mA; T
J
= 25°C; unless otherwise noted
Symbol
Parameter
Conditions
SE5508 – 1.5
SE5508 – 1.8
Min
1.470
1.764
2.450
2.744
2.940
3.234
--
Typ
1.5
1.8
2.5
2.8
3.0
3.3
1
Max
1.530
1.836
2.550
2.856
3.060
3.366
--
Unit
V
V
V
V
V
%/V
V
OUT
Output Voltage
Accuracy
SE5508 – 2.5
SE5508 – 2.8
SE5508 – 3.0
SE5508 – 3.3
ΔV
OUT
ΔV
OUT
Line Regulation
Load Regulation
(5)
Output Voltage
V
IN
= V
OUT
+ 1V to 6V, I
OUT
= 10mA
(V
OUT
= 3.3V)
V
IN
= 5V; I
OUT
= 10mA to 150mA
(V
OUT
= 3.3V)
Note 4
--
1
--
%
ΔV
OUT
/ΔT
Temperature
Coefficient
--
0.033
--
mV/°C
Preliminary and all contents are subject to change without prior notice.
© Seaward Electronics, Inc., 2005. • www.seawardinc.com.cn • Page 2
150mA CMOS Low Noise
LDO Voltage Regulator
(Preliminary)
Electrical Characteristics (Continued)
V
IN
= 5V; C
IN
= 2.2μF; C
OUT
= 2.2μF; I
OUT
= 10mA; T
J
= 25°C; unless otherwise noted
SE5508
Symbol
Parameter
Dropout Voltage
(6)
Conditions
I
OUT
= 10mA
Min
--
--
--
--
--
--
--
Typ
20
200
500
150
20
62
0.1
Max
--
--
--
--
--
--
--
Unit
V
IN
– V
OUT
I
OUT
= 75mA
I
OUT
= 150mA
mV
T
PROTECTION
PSRR
Thermal Protection
Ripple Rejection
Thermal Protection Temperature
Protection Hysterisys
f = 120 Hz
V
EN
= 0V
°C
dB
I
Q
Quiescent Current
(VOUT = 1.5V)
V
EN
= V
TH(EN)
; I
OUT
= 10mA
(VOUT = 1.5V)
μA
--
1.6
--
300
50
--
--
--
--
--
0.4
--
V
TH(EN)
I
LIMIT
Enable Input
Threshold Voltage
Current Limit
Voltage Increasing, Output Turns On, Logic High
Voltage Decreasing, Output Turns Off, Logic Low
V
mA
Note 1:
Exceeding the absolute maximum rating may damage the device.
Note 2:
The device is not guaranteed to function outside its operating rating.
Note 3:
The maximum allowable power dissipation at any T
A
(ambient temperature) is calculated using: P
D(MAX)
=
(T
J(MAX)
– T
A
)/Θ
JA
. Exceeding the maximum allowable power dissipation will result in excessive die temperature,
and the regulator will go into thermal shutdown. See “Thermal Consideration” section for details
Note 4:
Output voltage temperature coefficient is the worst case voltage change divided by the total temperature range.
Note 5:
Regulation is measured at constant junction temperature using low duty cycle pulse testing. Parts are tested
for load regulation in the load range from 0.1mA to 150mA.
covered by the thermal regulation specification.
Note 6:
Dropout voltage is defined as the input to output differential at which the output voltage drops 2% below its
nominal value measured at 1V differential.
Changes in output voltage due to heating effects are
Preliminary and all contents are subject to change without prior notice.
© Seaward Electronics, Inc., 2005. • www.seawardinc.com.cn • Page 3
150mA CMOS Low Noise
LDO Voltage Regulator
(Preliminary)
Line Regulation (VOUT = 3.3V)
(VIN = 4.3V to 5V, IOUT = 10mA)
3.6000
3.5000
VOUT (V)
3.4000
3.3000
3.2000
3.1000
3.0000
4.2
4.7
5.2
VIN (V)
5.7
VOUT (V)
3.6000
3.5000
3.4000
3.3000
3.2000
3.1000
3.0000
0
50
100
IOUT (mA)
SE5508
Load Regulation (VOUT = 3.3V)
(VIN = 5V, IOUT = 10mA to 150mA)
150
Output Voltage vs Temperature
(VIN = 3.3V, IOUT = 10mA)
1.600
100
90
1.550
80
70
IQ vs IOUT (VOUT = 1.5V)
(VIN = 3.3V, IOUT = 10mA to 150mA)
Output Voltage(V)
1.500
IQ (uA)
60
50
40
30
20
10
1.450
1.400
20
30
40
50
60
70
80
90
100
110
120
0
0
20
40
60
80
100
120
140
160
Temperature(C )
IOUT (mA)
P S RR (VOUT = 3.3V)
(VIN = 5V, VP P = 1V)
70.0
65.0
60.0
Transient Response (VOUT = 3.3V)
(IOUT = 1mA to 40mA)
P S R R (dB)
55.0
50.0
45.0
40.0
35.0
30.0
100
1000
10000
100000
Frequency (Hz)
C BY = 10uF
C BY =22uF
C BY = 0.1uF
Preliminary and all contents are subject to change without prior notice.
© Seaward Electronics, Inc., 2005. • www.seawardinc.com.cn • Page 4
150mA CMOS Low Noise
LDO Voltage Regulator
(Preliminary)
Application Hints
Like any low dropout regulator, SE5508 requires
external capacitors to ensure stability.
ensure performance.
The
external capacitors must be carefully selected to
SE5508
Thermal Considerations
It is important that the thermal limit of the package is
not exceeded.
protection.
to ground.
The SE5508 has built-in thermal
When the thermal limit is exceeded,
The power dissipation for a given
the IC will enter protection, and V
OUT
will be pulled
application can be calculated as following:
The power dissipation (P
D
) is
P
D
= I
OUT
* [V
IN
– V
OUT
]
The thermal limit of the package is then limited to
P
D(MAX)
= [T
J
– T
A
]/Θ
JA
where T
J
is the junction
temperature, TA is the ambient temperature, and
Θ
JA
is around 230°C/W for SE5508.
SE5508 is
designed to enter thermal protection at 150°C. For
example, if T
A
is 25°C then the maximum P
D
is
limited to about 0.6W. In other words, if I
OUT(MAX)
=
150mA, then [V
IN
– V
OUT
] cannot exceed 3.6V.
Input Capacitor
An input capacitor of at least 1μF is required.
Ceramic or Tantalum can be used. The value can
be increase without upper limit.
Output Capacitor
An output capacitor is required for stability. It must
be placed no more than 1 cm away from the V
OUT
pin, and connected directly between V
OUT
and GND
pins.
The minimum value is 1μF but may be
increase without limit.
Application Diagram
Block Diagram
Preliminary and all contents are subject to change without prior notice.
© Seaward Electronics, Inc., 2005. • www.seawardinc.com.cn • Page 5
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