150mA CMOS LDO
Regulator
(Preliminary)
Description
The
CYT6166
series of fixed output low dropout
linear regulators are designed for portable battery
powered applications, which require low dropout
voltage and low ground current.
Each device
contains a voltage reference unit, an error amplifier,
a PMOS power transistor, and resistors for setting
output voltage, and current limit and temperature
limit protection circuits.
The
CYT6166
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, and 3.3V.
CYT6166
Features
Typical Low Dropout Voltage of 203mV at
75mA.
Guaranteed 150mA output over the full
operating temperature range.
Excellent Line and Load Regulation.
High Accuracy Output Voltage of 2%.
Typical Low Ground Current at 1mA
Current Limiting and Thermal Protection.
Standard SOT-23-3L, TO-92, and SOT-323-3L
Package.
Applications
Cellphones.
Wireless LAN’s.
Hand-Held Instrumentation.
Portable Video Game Devices.
Digital Cameras.
Marking Information
CYT6166AHN
YYWW
CYT6166BHN
YYWW
CYT6166CHN
YYWW
CYT6166DHN
YYWW
CYT6166EHN
YYWW
CYT6166FHN
YYWW
CYT6166AHG
YYWW
CYT6166BHG
YYWW
CYT6166CHG
YYWW
CYT6166DHG
YYWW
CYT6166EHG
YYWW
CYT6166FHG
YYWW
Ordering/Marking Information
Package
Ordering Information
3.3V
2.8V
2.5V
1.8V
1.5V
3.0V
3.3V
2.8V
2.5V
1.8V
1.5V
3.0V
CYT6166AHN
CYT6166BHN
CYT6166CHN
CYT6166DHN
CYT6166EHN
CYT6166FHN
CYT6166AHG
CYT6166BHG
CYT6166CHG
CYT6166DHG
CYT6166EHG
CYT6166FHG
YY: year code
WW: week code.
Preliminary and all contents are subject to change without prior notice.
1
SEAWARD
ELECTRONICS
150mA CMOS LDO
Regulator
(Preliminary)
Thermal Considerations
SE5166
Application Hints
Like any low dropout regulator, SE5166 requires
external capacitors to ensure stability.
ensure performance.
The
external capacitors must be carefully selected to
It is important that the thermal limit of the package is
not exceeded.
protection.
to ground.
The SE5166 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, T
A
is the ambient temperature, and
Θ
JA
is around 250°C/W for SE5166.
SE5166 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 0.5W. In other words, if I
OUT(MAX)
=
150mA, then [V
IN
– V
OUT
] cannot exceed 3.33V.
Input Capacitor
An input capacitor of at least 2.2µF is required.
Ceramic or Tantalum can be used. The value can
be increase 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 minimum value is 2.2µF but may be
increase without limit.
Preliminary and all contents are subject to change without prior notice.
© Seaward Electronics, Inc., 2004. • www.seawardinc.com • Page 5
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