MC33761
Ultra Low−Noise Low
Dropout Voltage Regulator
with 1.0 V ON/OFF Control
The MC33761 is an Low DropOut (LDO) regulator featuring
excellent noise performances. Thanks to its innovative design, the
circuit reaches an impressive 40
mVRMS
noise level
without
an
external bypass capacitor. Housed in a small SOT−23 5 leads−like
package, it represents the ideal designer’s choice when space and
noise are at premium. The absence of external bandgap capacitor
accelerates the response time to a wake−up signal and keeps it within
40
ms
(in repetitive mode), making the MC33761 as a natural
candidate for portable applications.
The MC33761 also hosts a novel architecture which prevents
excessive undershoots in the presence of fast transient bursts, as in any
bursting systems.
Finally, with a static line regulation better than −75 dB, it naturally
shields the downstream electronics against choppy lines.
Features
http://onsemi.com
5
1
THIN SOT−23−5
SN SUFFIX
CASE 483
PIN CONNECTIONS AND
MARKING DIAGRAM
•
Ultra−Low Noise: 150 nV/√Hz @ 100 Hz, 40
mVRMS
•
•
•
•
•
•
•
•
•
•
•
100 Hz−100 kHz Typical, I
out
= 60 mA, Co = 1.0
mF
Fast Response Time from OFF to ON: 40
ms
Typical at a 200 Hz
Repetition Rate
Ready for 1.0 V Platforms: ON with a 900 mV High Level
Nominal Output Current of 80 mA with a 100 mA Peak Capability
Typical Dropout of 90 mV @ 30 mA, 160 mV @ 80 mA
Ripple Rejection: 70 dB @ 1.0 kHz
1.5% Output Precision @ 25°C
Thermal Shutdown
V
out
Available at 2.5 V, 2.8 V, 2.9 V, 3.0 V, 5.0 V
Operating Range from −40 to +85°C
Dual Version is Available as MC33762
Pb−Free Packages are Available
V
in
GND
ON/OFF
1
LxxAYW
G
G
(Top View)
2
3
5 V
out
4 NC
Lxx
= Device Code
A
= Assembly Location
Y
= Year
W
= Work Week
G
= Pb−Free Package
(Note: Microdot may be in either location)
ORDERING INFORMATION
See detailed ordering and shipping information in the package
dimensions section on page 12 of this data sheet.
Applications
•
Noise Sensitive Circuits: VCOs RF Stages, etc.
•
Bursting Systems (TDMA Phones)
•
All Battery Operated Devices
ON/
OFF
NC
3
4
On/Off
Band Gap
Reference
V
out
1
Thermal
Shutdown
V
in
5
*Current Limit
*Antisaturation Protection
*Load Transient Improvement
GND
2
Figure 1. Simplified Block Diagram
©
Semiconductor Components Industries, LLC, 2006
1
July, 2006 − Rev. 8
Publication Order Number:
MC33761/D
MC33761
PIN FUNCTION DESCRIPTIONS
Pin #
1
2
3
4
5
Pin Name
V
in
GND
ON/OFF
NC
V
out
Function
Powers the IC
The IC’s ground
Shuts or wakes−up the IC
None
Delivers the output voltage
A 900 mV level on this pin is sufficient to start the IC. A 150 mV shuts it
down.
It makes no arm to connect the pin to a known potential, like in a
pin−to−pin replacement case.
This pin requires a 1.0
mF
output capacitor to be stable.
Description
A positive voltage up to 12 V can be applied upon this pin.
MAXIMUM RATINGS
Value
Rating
Power Supply Voltage
ESD Capability, HBM Model
ESD Capability, Machine Model
Maximum Power Dissipation
NW Suffix, Plastic Package
Thermal Resistance Junction−to−Air
Operating Ambient Temperature
Maximum Junction Temperature (Note 1)
Maximum Operating Junction Temperature (Note 2)
Storage Temperature Range
Pin #
1
All Pins
All Pins
−
Symbol
V
in
−
−
P
D
R
qJA
−
T
A
T
Jmax
T
J
T
stg
Min
−
−
−
−
−
−
−
−
−
Max
12
1.0
200
Internally Limited
210
−40 to +85
150
125
−60 to +150
Unit
V
kV
V
W
°C/W
°C
°C
°C
°C
−
Stresses exceeding Maximum Ratings may damage the device. Maximum Ratings are stress ratings only. Functional operation above the
Recommended Operating Conditions is not implied. Extended exposure to stresses above the Recommended Operating Conditions may affect
device reliability.
ELECTRICAL CHARACTERISTICS
(For typical values T
A
= 25°C, for min/max values T
A
= −40°C to +85°C, max T
J
= 125°C unless otherwise noted)
Characteristics
LOGIC CONTROL SPECIFICATIONS
Input Voltage Range
ON/OFF Input Resistance (all versions)
ON/OFF Control Voltages (Note 3)
Logic Zero, OFF State, I
O
= 50 mA
Logic One, ON State, I
O
= 50 mA
CURRENTS PARAMETERS
Current Consumption in OFF State (all versions)
OFF Mode Current: V
in
= V
out
+ 1.0 V, I
O
= 0, V
OFF
=
150 mV
Current Consumption in ON State (all versions)
ON Mode Current: V
in
= V
out
+ 1.0 V, I
O
= 0, V
ON
= 3.5 V
Current Consumption in ON State (all versions), ON Mode
Saturation Current: V
in
= V
out
− 0.5 V, No Output Load
Current Limit V
in
= Vout
nom
+ 1.0 V,
Output is brought to Vout
nom
− 0.3 V (all versions)
1. Internally limited by shutdown.
2. Specifications are guaranteed below this value.
3. Voltage slope should be greater than 2.0 mV/ms.
−
IQ
OFF
−
0.1
2.0
mA
3
3
3
V
ON/OFF
R
ON/OFF
V
ON/OFF
−
900
−
−
150
−
0
−
−
250
V
in
−
V
kW
mV
Pin #
Symbol
Min
Typ
Max
Unit
−
−
−
IQ
ON
IQ
SAT
I
MAX
−
−
100
180
800
180
−
−
500
mA
mA
mA
http://onsemi.com
2
MC33761
ELECTRICAL CHARACTERISTICS
(continued)
(For typical values T
A
= 25°C, for min/max values T
A
= −40°C to +85°C, max T
J
= 125°C unless otherwise noted)
Characteristics
Pin #
Symbol
Min
Typ
Max
Unit
OUTPUT VOLTAGES
V
out
+ 1.0 V < V
in
< 6.0 V, T
A
= 25°C, 1.0 mA < I
out
< 80 mA
2.5 V
2.8 V
2.9 V
3.0 V
5.0 V
Other Voltages up to 5.0 V Available in 50 mV Increment Steps
V
out
+ 1.0 V < V
in
< 6.0 V, T
A
= −40°C to +85°C, 1.0 mA < I
out
< 80 mA
2.5 V
2.8 V
2.9 V
3.0 V
5.0 V
Other Voltages up to 5.0 V Available in 50 mV Increment Steps
5
5
5
5
5
5
5
5
5
5
5
5
V
out
V
out
V
out
V
out
V
out
V
out
V
out
V
out
V
out
V
out
V
out
V
out
2.462
2.758
2.857
2.955
4.925
−1.5
2.425
2.716
2.813
2.91
4.850
−3.0
2.5
2.8
2.9
3.0
5.0
X
2.5
2.8
2.9
3.0
5.0
X
2.537
2.842
2.943
3.045
5.075
+1.5
2.575
2.884
2.987
3.090
5.150
+3.0
V
V
%
V
V
V
V
V
%
V
V
LINE AND LOAD REGULATION, DROPOUT VOLTAGES
Line Regulation (all versions)
V
out
+ 1.0 V < V
in
< 12 V, I
out
= 80 mA
Load Regulation (all versions)
V
in
= V
out
+ 1.0 V, C
out
= 1.0
mF,
I
out
= 1.0 to 80 mA
Dropout Voltage (all versions) (Note 4)
I
out
= 30 mA
I
out
= 60 mA
I
out
= 80 mA
5/1
5
Reg
line
Reg
load
−
−
−
−
20
40
mV
mV
mV
5
5
5
V
in
−V
out
V
in
−V
out
V
in
−V
out
−
−
−
90
140
160
150
200
250
DYNAMIC PARAMETERS
Ripple Rejection (all versions)
V
in
= V
out
+ 1.0 V + 1.0 kHz 100 mVpp Sinusoidal Signal
Output Noise Density @ 1.0 kHz
RMS Output Noise Voltage (all versions)
C
out
= 1.0
mF,
I
out
= 50 mA, F = 100 Hz to 1.0 MHz
Output Rise Time (all versions) C
out
= 1.0
mF,
I
out
= 50 mA,
10% of Rising ON Signal to 90% of Nominal V
out
5/1
5
5
5
Ripple
−
Noise
t
rise
−
−
−
−
−70
150
35
40
−
−
−
−
dB
nV/
√Hz
mV
ms
THERMAL SHUTDOWN
Thermal Shutdown (all versions)
4. V
out
is brought to V
out
− 100 mV.
−
−
−
−
125
°C
http://onsemi.com
3
MC33761
DEFINITIONS
Load Regulation
Line Regulation
The change in output voltage for a change in output
current at a constant chip temperature.
Dropout Voltage
The input/output differential at which the regulator output
no longer maintains regulation against further reductions in
input voltage. Measured when the output drops 100 mV
below its nominal value (which is measured at 1.0 V
differential value). The dropout level is affected by the chip
temperature, load current and minimum input supply
requirements.
Output Noise Voltage
The change in output voltage for a change in input voltage.
The measurement is made under conditions of low
dissipation or by using pulse technique such that the average
chip temperature is not significantly affected. One usually
distinguishes
static line regulation
or
DC line regulation
(a
DC step in the input voltage generates a corresponding step
in the output voltage) from
ripple rejection
or
audio
susceptibility
where the input is combined with a frequency
generator to sweep from a few hertz up to a defined
boundary while the output amplitude is monitored.
Thermal Protection
This is the integrated value of the output noise over a
specified frequency range. Input voltage and output current
are kept constant during the measurement. Results are
expressed in
mVRMS.
Maximum Power Dissipation
Internal thermal shutdown circuitry is provided to protect
the integrated circuit in the event that the maximum junction
temperature is exceeded. When activated at typically 125°C,
the regulator turns off. This feature is provided to prevent
catastrophic failures from accidental overheating.
Maximum Package Power Dissipation
The maximum total dissipation for which the regulator
will operate within its specs.
Quiescent Current
The quiescent current is the current which flows through
the ground when the LDO operates without a load on its
output: internal IC operation, bias etc. When the LDO
becomes loaded, this term is called the Ground current. It is
actually the difference between the input current (measured
through the LDO input pin) and the output current.
The maximum power package power dissipation is the
power dissipation level at which the junction temperature
reaches its maximum operating value, i.e. 125°C.
Depending on the ambient temperature, it is possible to
calculate the maximum power dissipation and thus the
maximum available output current.
http://onsemi.com
4
MC33761
CHARACTERIZATION CURVES
All curves taken with V
in
= V
out
+ 1.0 V, V
out
= 2.8 V, C
out
= 1.0
mF
4.5
QUIESCENT CURRENT (
m
A)
100
4.0
GROUND CURRENT (mA)
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0
0
20
40
60
OUTPUT CURRENT (mA)
80
165
−60
−40
−20
0
20
40
60
AMBIENT TEMPERATURE (°C)
80
100
−40°C
25°C
85°C
185
180
175
170
Figure 2. Ground Current versus
Output Current
200
85°C
OUTPUT VOLTAGE (V)
DROPOUT (mV)
150
25°C
−40°C
100
2.805
2.800
2.795
2.790
2.785
2.780
0
0
20
40
60
OUTPUT CURRENT (mA)
80
100
2.775
0
Figure 3. Quiescent Current versus
Temperature
85°C
40°C
25°C
0°C
−20°C
−40°C
20
40
60
OUTPUT CURRENT (mA)
80
100
50
Figure 4. Dropout versus Output Current
Figure 5. Output Voltage versus
Output Current
180
DROPOUT VOLTAGE (mV)
160
140
120
100
80
60
40
20
0
−60
−40
−20
20
40
0
TEMPERATURE (°C)
1.0 mA
60
80
100
30 mA
80 mA
60 mA
Figure 6. Dropout versus Temperature
http://onsemi.com
5
京公网安备 11010802033920号
EEWORLD
