CYT 6167
400mA CMOS LDO Regulator
General Description
The CYT6167 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 CYT6167 has low ground current at 65uA,
so it can help prolong battery life. The CYT6167 is
specially designed for hand-held,
battery
-powered devices.
Features
Typical 175mV dropout voltage at 150mA.
■
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-23-3 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-23-3 Package
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ShenZhen CYT IC Design CO ,Ltd
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CYT 6167
Pin Configuration
1.GND
2.OUT
3.IN
SOT-23-3
Application Diagram
Ordering/Marking Information
CYT6167-
X
X
X
Yield periods:
A-Z : 1-26
a-z : 27-52
Package Type:
L : SOT-23-3
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 6167
Absolute Maximum Ratings
(1)
Supply Input Voltage (VIN) ..….…..….…..….…..….…..….…..….…..….…..…
Power Dissipation (PD) ……..….…..….…..….…..….…..….…..….…..….…..…
Junction Temperature (TJ) ….….. ..….…..….…..….…..….…..….…..….…..…
Lead Temperature (soldering, 5 sec) ….…. ..….…..….…..….…..….…..….…..
Storage Temperature (TS) …. ..….…..….…..….…..….…..….…..….…..….…
6V
Internally Limited(3)
0°C to +150°C
260°C
-10°C to +150°C
Operating Ratings
(2)
Package Thermal Resistance ………..….…..….…..….…..….…..….…..….….
Supply Input Voltage (VIN) ….…..….…..….…..….…..….…..….…..….…..….
Junction Temperature (TJ) …….. ..….…..….…..….…..….…..….…..….…..…
250°C /W
+2.8V to +5.5V
0°C to +125°C
Electrical Characteristics
VIN = VOUT + 1.0V; CIN = 2.2µF; COUT = 2.2µF; IOUT = 10mA; TJ = 25°C, unless otherwise specified.
Symbol
Parameter
Conditions
CYT6167-1.5V
CYT6167-1.8V
CYT6167-2.5V
CYT6167-2.8V
CYT6167-3.0V
CYT6167-3.3V
Note4
V
IN
=4.3V to 6V,I
OUT
=10mA
(V
OUT
=3.3V)
V
IN
=5V I
OUT
=10 to 400mA
(V
OUT
=3.3V)
I
OUT
=10mA
I
OUT
=150mA
I
OUT
=300mA
I
OUT
=400mA
Thermal Protection
Temperature
Protection Hysterisys
F=120Hz
I
OUT
=10mA
V
OUT
=0V
Min
1.470
1.764
2.450
2.744
2.940
3.234
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Typ
1.5
1.8
2.5
2.8
3.0
3.3
0.025
1.0
1.0
15
175
380
600
150
20
59
65
600
Max
1.530
1.836
2.550
2.856
3.060
3.366
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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
-V
OUT
Dropout Voltage
(6)
mV
mV
℃
℃
dB
uA
mA
T
PROTECTION
PSRR
I
GROUND
I
LIMIT
Thermal Protection
Ripple Rejection
Ground 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 TA (ambient temperature) is calculated using:
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CYT 6167
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, CYT6167 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 look stability. It must be located no more than 1cm away from
the VOUT pin, and connected directly between VOUT and GND pins. The minimum value is 2.2uF but
once again its value can be increased without limit.
Thermal Consideration
It is important that the thermal limit of the package should not be exceeded. The CYT6167 has
built-in thermal protection. When the thermal limit is exceeded, the IC will enter protection, and the
VOUT, will be reset to zero. The power dissipation for a given application can be calculated as follows:
The Power Dissipation (PD) is
PD = IOUT * [VIN – VOUT]
The thermal limit of the package is then limited to PD(MAX) = [TJ – TA]/θJA where TJ is the junction
temperature, TA is ambient temperature, and
θJA
is around 250°C/W for CYT6167. CYT6167 is
designed to enter thermal protection at 150°C. For example, if TA is 25°C then the max PD is limited to
about 0.5W. In other words, if IOUT(MAX) = 400mA, then [VIN – VOUT] can not exceed 1.25V.
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CYT 6167
Typical Characteristics
Line Regulation (VOUT = 3.3V)
(VIN = 4.3V to 6V, IOUT = 10mA)
Load Regulation (VOUT = 3.3V)
(VIN = 5V, IOUT = 10mA to 500mA)
Output Voltage vs Temperature
(VIN = 5V, IOUT = 10mA)
IQ vs IOUT (VOUT = 3.3V)
VIN = 5V, IOUT = 10mA to 500mA)
PSRR (VOUT = 3.3)
(VIN = 5V, VPP = 1V)
Transient Response (VOUT = 3.3V)
(IOUT = 10mA to 40mA)
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