400mA Super LDO Linear
Regulator
Description
The
CYT6119
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 600mV. The
output voltage accuracy is better than 2%.
The
CYT6119
has low ground current at 65uA,
so it can help prolong battery life. The
CYT6119
is
specially designed for hand-held, battery-powered
devices.
CYT6119
Features
Typical 175mV dropout voltage at 150mA.
Low Ground current at 65uA. (Typ.)
Guaranteed 400mA 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-89-3 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
CYT6119
_ _ _
5V
Vin
C0
C=10u
M0
Vout
C1
C=10u
3.3V
R2
rload
PIN (1=>3): 1. G: OUT/GND/IN
2. N: GND/IN/OUT
gnd
Control
Logic
gnd
1.25V Ref
Over Current
Protection
gnd
Thermal
Protection
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.
1
400mA Super LDO Linear
Regulator
Absolute Maximum Ratings
(1)
Supply Input Voltage (V
IN
) ..………..……………….+6V
Power Dissipation (P
D
) ………….. Internally Limited
(3)
CYT6119
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
= V
OUT
+ 1.0V; C
IN
= 2.2µF; C
OUT
= 2.2µF, I
OUT
= 10mA; T
J
= 25°C, unless otherwise specified.
Symbol
Parameter
Conditions
CYT6119-1.5V
CYT6119-1.8V
V
OUT
Output Voltage
Accuracy
CYT6119-2.5V
CYT6119-2.8V
CYT6119-3.0V
CYT6119-3.3V
∆V
OUT
/∆T
∆V
OUT
/ V
OUT
∆V
OUT
/ V
OUT
Output Voltage
Temperature Coefficient
Line Regulation
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
1.5
15
175
320
600
150
20
51
65
110
600
Max
1.530
1.836
2.550
2.856
3.060
3.366
--
--
--
--
--
--
--
--
--
--
--
--
--
--
Units
V
Note 4
V
IN
= V
OUT
+ 1V to 5.5V
I
OUT
=10mA to 250mA
(5)
I
OUT
=10mA to 400mA
(5)
I
OUT
=10mA
ppm/
℃
%
%
V
IN
- V
OUT
Dropout Voltage
(6)
I
OUT
=150mA
I
OUT
=250mA
I
OUT
=400mA
mV
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
I
OUT
=400mA
V
OUT
=0V
℃
℃
dB
uA
mA
All contents are subject to change without prior notice.
2
400mA Super 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.
CYT6119
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 400mA. 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
400mA Super LDO Linear
Regulator
Application Hints
Like any Low dropout regulator,CYT6119 requires
external capacitors to ensure stability. The external
capacitors must be carefully selected to ensure the
performances.
CYT6119
Thermal Consideration
It is important that the thermal limit of the package
should not be exceeded. The
CYT6119
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
CYT6119. CYT6119
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)
= 400mA, then [V
IN
–
V
OUT
] can not exceed 1.75V.
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
400mA Super LDO Linear
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
CYT6119
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
