150mA CMOS LDO
Regulator
(Preliminary)
Description
The
CYT5168
series of fixed output low dropout
linear regulators are designed for portable battery
powered applications, which require fast enable
response time, and low dropout voltage.
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
CYT5168
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.
CYT5168
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 50µA
Current Limiting and Thermal Protection.
Applications
Cellphones.
Wireless LAN’s.
Hand-Held Instrumentation.
Portable Video Game Devices.
Digital Cameras.
Ping Configuration
Ordering Information
CYT5168
_ _ _
PIN (1=>3): 1. G: OUT/IN/GND
2. N: GND/OUT/IN
Package Type: 1. L: SOT-23-3L
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
Block Diagram
Preliminary and all contents are subject to change without prior notice.
1
150mA CMOS LDO
Regulator
(Preliminary)
Absolute Maximum Rating
(1)
Parameter
Input Voltage
Power Dissipation
Output Short Circuit Duration
Thermal Resistance,
Junction-to-Ambient
Lead Temperature (Soldering,
5 sec.)
Junction Temperature
Storage Temperature
T
J
T
S
Θ
JA
Symbol
V
IN
P
D
Value
6
Internally
Limited
(3)
Infinite
230
°C/W
Units
V
CYT5168
260
0 to +125
-10 to +150
°C
°C
°C
Operating Rating
(2)
Parameter
Supply Input Voltage
Junction Temperature
Symbol
V
IN
T
J
Value
+2.5V to +6
0 to +125
Units
V
°C
Electrical Characteristics
V
IN
= 5V; C
IN
= 2.2µF; C
OUT
= 2.2µF; I
OUT
= 10mA; T
J
= 25°C; unless otherwise noted
Symbol
Parameter
Conditions
CYT5168
– 1.5V
CYT5168
– 1.8V
CYT5168
– 2.5V
CYT5168
– 2.8V
CYT5168
– 3.0V
CYT5168
– 3.3V
(V
IN
= 4.5V to 5.5V, I
OUT
= 10mA )
CYT5168
– 1.5V
CYT5168
– 1.8V
CYT5168
– 2.5V
CYT5168
– 2.8V
CYT5168
– 3.0V
CYT5168
– 3.3V
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
Max
1.530
1.836
2.550
2.856
3.060
3.366
Unit
V
V
V
V
V
V
OUT
Output Voltage
Accuracy
∆V
OUT
Line Regulation
--
1
--
%
Preliminary and all contents are subject to change without prior notice.
2
150mA CMOS LDO
Regulator
(Preliminary)
Electrical Characteristics (Continued)
V
IN
= 5V; C
IN
= 2.2µF; C
OUT
= 2.2µF; I
OUT
= 10mA; T
J
= 25°C; unless otherwise noted
CYT5168
Symbol
Parameter
Conditions
(V
IN
= 5V; I
OUT
= 10mA to 150mA)
CYT5168
– 1.5V
CYT5168
– 1.8V
CYT5168
– 2.5V
CYT5168
– 2.8V
CYT5168
– 3.0V
CYT5168
– 3.3V
Min
Typ
Max
Unit
∆V
OUT
Load Regulation
(5)
--
1
--
%
∆V
OUT
/∆T
Output Voltage
Temperature Coefficient
Note 4
I
OUT
= 10mA
--
--
--
--
--
--
--
--
300
0.79
19
203
467
150
20
51
50
--
--
--
--
--
--
--
--
--
--
mV/°C
V
IN
– V
OUT
Dropout Voltage
(6)
I
OUT
= 75mA
I
OUT
= 150mA
Thermal Protection Temperature
Protection Hysterisys
f = 120 Hz
I
OUT
= 10mA
mV
T
PROTECTION
PSRR
I
Q
I
LIMIT
Thermal Protection
Ripple Rejection
Quiescent Current
Current Limit
°C
dB
µA
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 T
A
(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 “Thermal Consideration” 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 0.1mA to 150mA.
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.
Changes in output voltage due to heating effects are
Preliminary and all contents are subject to change without prior notice.
3
150mA CMOS LDO
Regulator
(Preliminary)
Application Hints
external capacitors to ensure stability.
ensure performance.
The
CYT5168
Thermal Considerations
not exceeded.
protection.
to ground.
The
CYT5168
has built-in thermal
Like any low dropout regulator,
CYT5168
requires It is important that the thermal limit of the package is
external capacitors must be carefully selected to
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, TA is the ambient temperature, and
Θ
JA
is around 230°C/W for
CYT5168.
CYT5168
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 0.6W. In other words, if I
OUT(MAX)
=
150mA, then [V
IN
– V
OUT
] cannot exceed 4V.
Input Capacitor
An input capacitor of at least 1µF 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 1µF but may be
increase without limit.
Preliminary and all contents are subject to change without prior notice.
4
150mA CMOS LDO
Regulator
(Preliminary)
OUTLINE DRAWING SOT-23-3L
C
J
B
H
CYT5168
DIM
A
B
C
D
E
F
G
H
J
K
L
N
DIMENSIONS
INCHES
MM
MIN MAX MIN MAX
0.110
0.047
0.083
0.035
0.070
0.018
0.015
0.0005
0.034
0.003
-
0.120
0.055
0.104
0.040
0.080
0.024
0.020
0.004
0.040
0.007
0.027
2.80
1.20
2.10
0.89
1.78
0.45
0.37
0.013
0.887
0.085
-
3.04
1.40
2.64
1.03
2.05
0.60
0.51
0.10
1.02
0.18
0.69
D
A
E
F
G
K
L
Preliminary and all contents are subject to change without prior notice.
5
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