500mA CMOS LDO
Regulator
Description
The
CYT6118
is an efficient linear voltage
regulator. It has extra low dropout voltage. At light
loads the typical dropout voltage is 4.6mV, at full
load the typical dropout voltage is 300mV. The
output voltage accuracy is better than 2%.
The
CYT6118
has low ground current, so it can
help prolong battery life. The
CYT6118
is specially
designed for hand-held, battery-powered devices.
CYT6118
Features
Typical 90mV dropout voltage at 150mA.
Guaranteed 500mA output over the full
operating temperature range.
Low 300mV typical dropout voltage at full load.
Extremely tight load and line regulation.
Low temperature coefficient.
Current and thermal limiting.
No-load stability.
Standard SOT-89-3 package.
Pin Configuration
Top view
Applications
Active SCSI terminators.
Post regulators for switching supplies.
Battery chargers.
1
2
3
High-efficiency linear power supplies.
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
CYT6118
_ _ _
5V
Vin
C0
C=10u
M0
Vout
C1
C=10u
3.3V
R2
rload
PIN (1=>3): 1. G: OUT/GND/IN
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
gnd
Control
Logic
gnd
1.25V Ref
Over Current
Protection
gnd
Thermal
Protection
All contents are subject to change without prior notice.
1
500mA CMOS LDO
Regulator
Absolute Maximum Ratings
(1)
Supply Input Voltage (V
IN
) ..……….… -0.7V to +7V
Power Dissipation (P
D
) …………. Internally Limited
(3)
Junction Temperature (T
J
) …….….. 0°C to +125°C
Lead Temperature (soldering, 5 sec.) ….…. 260°C
Storage Temperature (T
S
) ………. -10°C to +150°C
CYT6118
Operating Ratings
(2)
Supply Input Voltage (V
IN
) ……...…… +2.5V to +6V
Junction Temperature (T
J
) …….….. 0°C to +125°C
Package Thermal
Resistance …………………………………120°C /W
Electrical Characteristics
V
IN
= V
OUT
+ 1.0V; C
OUT
= 4.7µF, I
OUT
= 10mA; T
J
= 25°C;unless otherwise specified.
Symbol
Parameter
Output Voltage
Accuracy
Output Voltage
Temperature Coefficient
Line Regulation
Load Regulation
(5)
Conditions
CYT6118-1.5V
CYT6118-1.8V
CYT6118-2.5V
CYT6118-2.8V
CYT6118-3.3V
Note 4
V
IN
= V
OUT
+ 1V to 5.5V
I
OUT
=10mA to 500mA
(5)
I
OUT
=10mA
V
OUT
<2V
V
IN
- V
OUT
Dropout
Voltage
(6)
V
OUT
>2V
I
OUT
=150mA
I
OUT
=500mA
I
OUT
=10mA
I
OUT
=150mA
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
Min
1.470
1.764
2.450
2.744
3.234
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Typ
1.5
1.8
2.5
2.8
3.3
40
0.3
0.5
9
175
530
4.6
90
300
150
30
35
1
1.5
Max
1.530
1.836
2.550
2.856
3.366
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ºC
ºC
dB
mA
A
mV
mV
Units
V
OUT
V
∆V
OUT
/∆T
∆V
OUT
/ V
OUT
∆V
OUT
/ V
OUT
ppm/℃
%
%
All contents are subject to change without prior notice.
2
500mA CMOS LDO
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.
CYT6118
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.
3
500mA CMOS LDO
Regulator
Application Hints
Like any Low dropout regulator,
CYT6118
requires
external capacitors to ensure stability. The external
capacitors must be carefully selected to ensure the
performances.
CYT6118
Thermal Consideration
It is important that the thermal limit of the package
should not be exceeded. The
CYT6118
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 120°C/W for
CYT6118. CYT6118
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 1W.
In other words, if I
OUT(MAX)
= 500mA, then [V
IN
–
V
OUT
] can not exceed 2.1V.
Input Capacitor:
An Input Capacitor of at least 10uF 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 10uF but once
again its value can be increased without limit.
All contents are subject to change without prior notice.
4
500mA CMOS LDO
Regulator
Typical Performance Characteristics
(V
IN
= 5V, C
IN
= 1µF, C
OUT
= 10µF, T
A
=25°C, unless otherwise noted.)
Load Regulation
3.5
3
CYT6118
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)
Quiescent Current (mA)
0.4
0.3
0.2
0.1
0
0
100
200
300
400
500
600
Output 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.
5
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