500mA CMOS LDO Linear Regulator
Description
The SE5119 is an efficient linear voltage
regulator. It has extra low dropout voltage. At light
loads the typical dropout voltage is 15mV, at full
load the typical dropout voltage is 800mV. The
output voltage accuracy is better than 2%.
The SE5119 has low ground current at 65uA,
so it can help prolong battery life. The SE5119 is
specially designed for hand-held, battery-powered
devices.
SE5119
Features
Typical 175mV dropout voltage at 150mA.
Low Ground current at 65uA. (Typ.)
Guaranteed 500mA output over the full
operating temperature range.
Extremely tight load and line regulation.
Low temperature coefficient.
Current and thermal limiting.
No-load stability.
Standard SOT-89-3L package.
Pin Configuration
Top view
Applications
Active SCSI terminators.
Post regulators for switching supplies.
Battery chargers.
High-efficiency linear power supplies.
1
2
3
Computer motherboard, display, graphic card
DC/DC converter, such as 5V to 3.3V, 3.3V to
2.8V or 3.3V to 2.5V.
SOT-89
Typical Application
Ordering Information
SE5119 _ _ _
PIN (1=>3): 1. G: OUT/GND/IN
2. N: GND/IN/OUT
Package Type: 1. K: SOT-89-3L
Output Voltage: 1. A: V
OUT
= 3.3V
2. B: V
OUT
= 2.8V
3. C: V
OUT
= 2.5V
4. D: V
OUT
= 1.8V
5. E: V
OUT
= 1.5V
6. F: V
OUT
= 3.0V
All contents are subject to change without prior notice.
© Seaward Electronics, Inc., 2005. • www.seawardinc.com • Page 1
500mA CMOS LDO Linear Regulator
Absolute Maximum Ratings
(1)
Supply Input Voltage (V
IN
) ..………..……………….+6V
Power Dissipation (P
D
) ………….. Internally Limited
(3)
SE5119
Operating Ratings
(2)
Supply Input Voltage (V
IN
) ……..…… +2.8V to +5.5V
Junction Temperature (T
J
) …….…….. 0°C to +125°C
Package Thermal
Resistance …………………………………… 180°C/W
Junction Temperature (T
J
) ………................….. 150°C
Lead Temperature (soldering, 5 sec.) ……....…. 260°C
Storage Temperature (T
S
) ………….. -10°C to +150°C
Electrical Characteristics
V
IN
= 5V; C
IN
= 2.2μF; C
OUT
= 2.2μF, I
OUT
= 10mA; T
J
= 25°C, unless otherwise specified.
Symbol
Parameter
Conditions
SE5119-1.5V(V
IN
=3.3V)
SE5119-1.8V(V
IN
=3.3V)
V
OUT
Output Voltage
Accuracy
SE5119-2.5V
SE5119-2.8V
SE5119-3.0V
SE5119-3.3V
ΔV
OUT
/ΔT
ΔV
OUT
/ V
OUT
Output Voltage
Temperature Coefficient
Line Regulation
Note 4
V
IN
= (V
OUT
+ 1)V to 5.5V
I
OUT
=10mA to
ΔV
OUT
/ V
OUT
Load Regulation
(5)
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
50
1
1
Max
1.530
1.836
2.550
2.856
3.060
3.366
--
--
--
Units
V
ppm/
℃
%/V
V
IN
= (V
OUT
+1)V
250mA
I
OUT
=10mA to
500mA
%
--
--
--
--
--
--
--
--
--
--
1.5
15
175
320
800
150
20
51
65
700
--
--
--
--
--
--
--
--
--
--
℃
℃
I
OUT
=10mA
V
IN
- V
OUT
Dropout Voltage
(6)
(V
OUT
>2V)
I
OUT
=150mA
I
OUT
=250mA
I
OUT
=500mA
T
PROTECTION
PSRR
I
GROUND
I
LIMIT
Thermal Protection
Ripple Rejection
Ground Current
Current Limit
Thermal Protection Temperature
Protection Hysterisys
f =120Hz
I
OUT
=10mA
V
OUT
=0V
mV
dB
uA
mA
All contents are subject to change without prior notice.
© Seaward Electronics, Inc., 2005. • www.seawardinc.com • Page 2
500mA CMOS LDO Linear Regulator
Note 1:
Exceeding the absolute maximum rating may damage the device.
Note 2:
The device is not guaranteed to function outside its operating rating.
SE5119
Note 3:
The maximum allowable power dissipation at any TA (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 Table 1 and the “Thermal Considerations” 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 100μA to 500mA. Changes in output voltage due to heating effects are
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.
All contents are subject to change without prior notice.
© Seaward Electronics, Inc., 2005. • www.seawardinc.com • Page 3
500mA CMOS LDO Linear Regulator
Application Hints
Like any Low dropout regulator, SE5119 requires
external capacitors to ensure stability. The external
capacitors must be carefully selected to ensure the
performances.
SE5119
Thermal Consideration
It is important that the thermal limit of the package
should not be exceeded. The SE5119 has built-in
thermal protection. When the thermal limit is
exceeded, the IC will enter protection, and the V
OUT
will be reset to zero. The power dissipation for a
given application can be calculated as follows:
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, T
A
is ambient temperature, and
θ
JA
is
around 180°C/W for SE5119. SE5119 is designed
to enter thermal protection at 150°C. For example, if
T
A
is 25°C then the max P
D
is limited to about 0.7W.
In other words, if I
OUT(MAX)
= 500mA, then [V
IN
–
V
OUT
] can not exceed 1.4V.
Input Capacitor:
An Input Capacitor of at least 2.2uF is required.
Ceramic or Tantalum can be used. The value can
be increased without upper limit.
Output Capacitor:
An Output Capacitor is required for look stability. It
must be located no more than 1cm away from the
V
OUT
pin, and connected directly between V
OUT
and
GND pins. The minimum value is 2.2uF but once
again its value can be increased without limit.
All contents are subject to change without prior notice.
© Seaward Electronics, Inc., 2005. • www.seawardinc.com • Page 4
500mA CMOS LDO Linear Regulator
Typical Performance Characteristics
(V
IN
= 5V, C
IN
= 2.2μF, C
OUT
= 2.2μF, T
A
=25°C, unless otherwise noted.)
Load Regulation
3.5
3
SE5119
Output Voltage vs Temperature
3.5
3
Output Voltage (V)
1.5V
1.8V
2.5V
3.3V
Output Voltage
2.5
2
1.5
1
0
100
200
300
400
500
600
Output Current (mA)
2.5
2
1.5
1
0
50
100
150
Temperature (C)
1.5V
1.8V
2.5V
3.3V
Quiescent Current vs Temperature
(Output Voltage @ 2.5V)
0.6
Dropout Voltage vs Output Current
1.17
1.16
1.15
1.14
1.13
1.12
1.11
1.1
1.09
1.08
1.07
1.06
0
20
40
60
80
100
120
140
Temperature (C)
0.5
Dropout Voltage (V)
0.4
0.3
0.2
0.1
0
0
100
200
300
400
500
600
Output Current (mA)
Quiescent Current (mA)
1.5V
1.8V
2.5V
3.3V
Line Transient
Load Transient (10mA – 500mA)
All contents are subject to change without prior notice.
© Seaward Electronics, Inc., 2005. • www.seawardinc.com • Page 5
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