CYT 6168
150mA CMOS LDO Regulator
General Description
The CYT6168 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 CYT6168 has low ground current at 50uA,
so it can help prolong battery life. The CYT6168 is
specially designed for hand-held, battery –powered
devices.
Features
Typical 200mV dropout voltage at 75mA.
■
Guaranteed 150mA 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-23-3L package.
■
■
RoHS Compliant and 100% Lead (Pb)-Free
Applications
■
■
■
■
CD/DVD-ROM, CD/RW
Wireless LAN card, Keyboard, Mouse
Battery Powered Equipments
PCMCIA Card
SOT-23-3L Package
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Revision 12/4/2007
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CYT 6168
Pin Configuration
1.GND
2.OUT
3.IN
SOT-23
Application Diagram
Ordering/Marking Information
CYT6168-
X
X
X
Yield periods:
A-Z : 1-26
a-z : 27-52
Package Type:
L : SOT-23-3L
Output Voltage:
A : 3.3V
B : 2.8V
C : 2.5V
D : 1.8V
E : 1.5V
F : 3.0V
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CYT 6168
Absolute Maximum Ratings
(1)
Supply Input Voltage (VIN) ..….…..….…..….…..….…..….…..….…..….…..….
0.7V to+6V
Power Dissipation (PD) ……..….…..….…..….…..….…..….…..….…..….…..…
Internally Limited(3)
Junction Temperature (TJ) ….….. ..….…..….…..….…..….…..….…..….…..…
0°C to +125°C
Lead Temperature (soldering, 5 sec) ….…..….…..….…..….…..….…..….…..
260°C
Storage Temperature (TS) …. ..….…..….…..….…..….…..….…..….…..….…. -40°C to +150°C
Operating Ratings
(2)
Package Thermal Resistance …..….…..….…..….…..….…..….…..….…. ..…
230°C /W(sot-23)
Supply Input Voltage (VIN) ….…..….…..….…..….…..….…..….…..….…. …
+2.0V to +5.5V
Junction Temperature (TJ) …….. ..….…..….…..….…..….…..…. 0°C to +125°C Package Thermal
Electrical Characteristics
V
IN
= 5V; C
IN
= 2.2µF; C
OUT
= 2.2µF; I
OUT
= 10mA; TJ = 25°C; unless otherwise noted
Symbol
Parameter
Conditions
CYT6168-1.5V
CYT6168-1.8V
CYT6168-2.5V
CYT6168-2.8V
CYT6168-3.0V
CYT6168-3.3V
Note4
V
IN
=V
OUT
+1V to 6V,I
OUT
=10mA
(VOUT=3.3V)
Min
1.470
1.764
2.450
2.744
2.940
3.234
--
--
--
--
--
--
--
--
--
--
300
Typ
1.5
1.8
2.5
2.8
3.0
3.3
0.033
1.0
1.0
20
200
500
150
20
57
50
--
Max
1.530
1.836
2.550
2.856
3.060
3.366
--
--
--
--
--
--
--
--
--
--
--
Units
V
OUT
Output Voltage Accuracy
V
△V
OUT
/△T
△V
OUT
/V
OUT
△V
OUT
/V
OUT
Output Voltage
Temperature Coefficient
Line Regulation
Load Regulation
(5)
mV/℃
％/V
％
V
IN
=5V I
OUT
=10 to 150mA
(V
OUT
=3.3V)
I
OUT
=10mA
I
OUT
=75mA
I
OUT
=150mA
Thermal Protection
Temperature
Protection Hysterisys
F=120Hz
I
OUT
=10mA
V
OUT
=0V
V
IN
-V
OUT
Dropout Voltage
(6)
mV
T
PROTECTION
PSRR
I
Q
I
LIMIT
Thermal Protection
Ripple Rejection
Quiescent Current
Current Limit
℃
℃
dB
uA
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 TA (ambient temperature) is calculated using:
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Revision 12/4/2007
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CYT 6168
PD(MAX) = (TJ(MAX)- TA)/θJA. 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.
Application Hints
Like any Low dropout regulator, CYT6168 requires external capacitors to ensure stability. The
external capacitors must be carefully selected to ensure the performances.
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 stability. It must be placed no more than 1 cm away from the
VOUT pin, and connected directly between VOUT and GND pins. The minimum value is 2.2µF but may
be increase without limit.
Thermal Consideration
It is important that the thermal limit of the package not exceeded. The CYT6168 has built-in
thermalprotection. When the thermal limit is exceeded, the IC will enter protection, and VOUT will be
pulled to ground. The power dissipation for a given application can be calculated as following:
The power dissipation (PD) is
PD = IOUT * [VIN – VOUT]
The thermal limit of the package is then limited PD(MAX) = [TJ – TA]/ΘJA where TJ is the junction
temperature, TA is the ambient temperature, and
ΘJA
is around 250°C/W for CYT6168. CYT6168
designed to enter thermal protection at 150°C. For example, if TA is 25°C then the maximum PD limited
to about 0.5W. In other words, if IOUT(MAX) 150mA, then [VIN – VOUT] cannot exceed 3.33V.
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Revision 12/4/2007
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CYT 6168
Typical Characteristics
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Revision 12/4/2007
All contents are subject to change without prior notice.
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