600mA CMOS Low Power Low
Noise LDO Voltage Regulator
Description
The SE5121 series of fixed output low dropout
linear regulators are designed for portable battery
powered applications, which require low power
consumption, low noise environment, and low
dropout voltage. Each device contains a bandgap
voltage reference, an error amplifier, a PMOS
power transistor, and resistors for setting output
voltage, and current limit and temperature limit
protection circuits.
The SE5121 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, 3.3, 3.5and 3.6V.
SE5121
Features
Typical 175mV Dropout Voltage at 150mA.
Excellent Line and Load Regulation.
High Accuracy Output Voltage of 2%.
Ultra-Low Ground Current at 35μA (Typ.)
Over Current and thermal Protection.
Standard SOT-89-3L Package.
100% Lead (Pb)-Free
Application
USB removable devices
MPEG4 devices
Wireless LAN’s
Hand-Held Instrumentation.
Portable DVD players
Digital camera
Pin Configuration
Ordering Information
SE5121 _ _ _
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
7. Y: V
OUT
= 3.5V
8. Q: V
OUT
= 3.6V
Block Diagram
Revision 12/4/2008
Preliminary and all contents are subject to change without prior notice
© Seaward Electronics Inc., 2005. • www.seawardinc.com.cn • Page 1
600mA CMOS Low Power Low
Noise LDO Voltage Regulator
Absolute Maximum Rating
(1)
Parameter
Input 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
OUT
P
D
Value
6
-0.3 to V
IN
Internally
Limited
(3)
Infinite
180
°C/W
Units
V
V
SE5121
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
5.5
0 to +125
Units
V
°C
Electrical Characteristics
V
IN
= 5V; C
IN
= 2.2μF; C
OUT
= 2.2μF（
Electrolytic
capacitor
）;
I
OUT
= 10mA; T
J
= 25°C; unless otherwise noted
Conditions
Min
1.470
1.764
2.450
2.744
2.940
3.234
3.430
3.528
--
--
Typ
1.5
1.8
2.5
2.8
3.0
3.3
3.5
3.6
0.2
2.0
Max
1.530
1.836
2.550
2.856
3.060
3.366
3.570
3.672
--
--
%/V
%
V
Unit
Symbol
Parameter
SE5121 – 1.5(V
IN
=3.3V)
SE5121 – 1.8(V
IN
=3.3V)
SE5121 – 2.5
V
OUT
Output Voltage
Accuracy
SE5121 – 2.8
SE5121 – 3.0
SE5121 – 3.3
SE5121 – 3.5
SE5121 – 3.6
ΔV
OUT
ΔV
OUT
Line Regulation
Load Regulation
(5)
Output Voltage
ΔV
OUT
/ΔT
Temperature
Coefficient
Note 4
V
IN
= (V
OUT
+ 0.8)V to 5.5V
V
IN
= (V
OUT
+ 0.8)V to 2.5V
I
OUT
= 10mA to 600mA
--
0.1
--
mV/°C
Revision 12/4/2008
Preliminary and all contents are subject to change without prior notice
© Seaward Electronics Inc., 2005. • www.seawardinc.com.cn • Page 2
600mA CMOS Low Power Low
Noise LDO Voltage Regulator
Electrical Characteristics (Continued)
V
IN
= 5V; C
IN
= 2.2μF; C
OUT
= 2.2μF（
Electrolytic
SE5121
capacitor
）;
I
OUT
= 10mA; T
J
= 25°C; unless otherwise noted
Conditions
I
OUT
= 10mA
Min
--
--
--
--
--
--
--
--
600
Typ
5
175
300
800
150
20
60
35
--
Max
--
--
--
--
--
--
--
--
--
°C
dB
μA
mA
mV
Unit
Symbol
Parameter
V
IN
– V
OUT
Dropout Voltage
(6)
I
OUT
= 150mA
I
OUT
= 250mA
I
OUT
= 600mA
Thermal Protection Temperature
Protection Hysterisys
f = 120 Hz
I
OUT
= 10mA
T
PROTECTION
PSRR
I
Q
I
LIMIT
Thermal Protection
Ripple Rejection
Quiescent Current
Current Limit
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 600mA.
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.
Note 7:
The Cin or Cout should be chosen carefully. Please refer to the Application Hints
Changes in output voltage due to heating effects are
Application Diagram
Revision 12/4/2008
Preliminary and all contents are subject to change without prior notice
© Seaward Electronics Inc., 2005. • www.seawardinc.com.cn • Page 3
600mA CMOS Low Power Low
Noise LDO Voltage Regulator
Application Hints
Like any low dropout regulator, SE5121 requires
external capacitors to ensure stability.
ensure performance.
The
external capacitors must be carefully selected to
SE5121
Thermal Considerations
It is important that the thermal limit of the package is
not exceeded.
protection.
to ground.
The SE5121 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 180°C/W for SE5121.
SE5121 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 0.7W. In other words, if I
OUT(MAX)
=
600mA, then [V
IN
– V
OUT
] cannot exceed 1.7V.
Input Capacitor
An input capacitor of at least 1μF is required. The
inexpensive Electrolytic capacitor is preferred.
The value can be increased 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 inexpensive Electrolytic capacitor is
recommended. The minimum value is 1μF but may
be increased without limit.
Revision 12/4/2008
Preliminary and all contents are subject to change without prior notice
© Seaward Electronics Inc., 2005. • www.seawardinc.com.cn • Page 4
600mA CMOS Low Power Low
Noise LDO Voltage Regulator
OUTLINE DRAWING SOT-89-3L
SE5121
DIM
SOT-89
A
C
D
K
L
M
J
N
DIMENSIONS
INCHES
MM
MIN
MAX
MIN
MAX
0.173 0.181
0.159 0.167
0.067 0.075
0.051 0.059
0.094 0.102
0.035 0.047
0.118REF
0.059REF
0.016 0.020
0.055 0.063
0.014 0.016
10°TYP
0.028REF
4.400 4.600
4.050 4.250
1.700 1.900
1.300 1.500
2.400 2.600
0.890 1.200
3.00REF
1.50REF
0.400 0.520
1.400 1.600
0.350 0.410
10°TYP
0.70REF
H
G
I
A
B
C
D
E
F
G
H
I
J
K
L
M
B
Customer Support
Seaward Electronics Incorporated – China
Section B, 2nd Floor, ShangDi Scientific Office Complex, #22 XinXi Road
Haidian District, Beijing 100085, China
Tel: 86-10-8289-5700/01/05
Fax: 86-10-8289-5706
Seaward Electronics Corporation – Taiwan
2F, #181, Sec. 3, Minquan East Rd,
Taipei, Taiwan R.O.C
Tel: 886-2-2712-0307
Fax: 886-2-2712-0191
Seaward Electronics Incorporated – North America
1512 Centre Pointe Dr.
Milpitas, CA95035, USA
Tel: 1-408-821-6600
Last Updated - 12/4/2008
Revision 12/4/2008
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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