CMPWR161
Micropower, Low Noise 4.75V/150mA LDO Regulator
Features
•
•
•
•
•
•
•
•
•
•
•
Excellent power supply ripple rejection for
V
IN
-V
OUT
down to 110mV
Excellent power supply ripple rejection in
audible band (20Hz to 20KHz)
Very low dropout voltage (110mV at 150mA)
Fast transient response minimizes glitches in
audible band.
Low noise in audible band
Guaranteed to deliver 150mA output at
4.75V output
Low quiescent current—300µ
A
typical
"Zero" current shutdown mode
5205 compatible pin-out
5-lead SOT-23 package
Lead-free version available
Product Description
The CMPWR161 is a micropower, low noise regulator
designed specifically to filter out noise from a 5V digital
supply making it ideal for noise-sensitive analog appli-
cations. The CMPWR161 delivers up to 150mA at a
fixed 4.75V output. A bandgap reference bypass pin
(BYP) provides low noise operation when an external
capacitor is connected between this pin and ground. In
addition, the CMPWR161 features an enable pin (EN)
which allows the regulator to be placed into shutdown
mode supporting low power and battery applications.
The CMOS regulator features low quiescent current
even at full load.
The CMPWR161 is housed in a 5-pin SOT-23 package,
which is ideal for space critical applications. It is avail-
able with optional lead-free finishing.
Applications
•
•
•
•
•
•
5V analog supply for audio CODEC
Low noise power supply ideal for audio use
Notebook computers
Sound cards
Motherboards
Set top boxes
Typical Application Circuit
Simplified Electrical Schematic
V
IN
V
OUT
CMPWR161
5V
Supply
Voltage
-
GND
V
IN
V
OUT
+
C
IN
EN
+
1
µ
F
BYP
GND
10nF
100nF
C
+
OUT
10
µ
F
V
OUT
4.75V@
150mA
EN
BYP
V
REF
4.75V
+
10kHz
-
GND
©
2004 California Micro Devices Corp. All rights reserved.
01/14/04
430 N. McCarthy Blvd., Milpitas, CA 95035-5112
L
Tel: 408.263.3214
L
Fax: 408.263.7846
L
www.calmicro.com
1
CMPWR161
PACKAGE / PINOUT DIAGRAM
Top View
V
IN
1
5
V
OUT
161Y/R
4
BYP
GND
2
EN
3
5-pin SOT23
Note: This drawing is not to scale.
PIN DESCRIPTIONS
PIN
1
NAME
V
IN
DESCRIPTION
Positive input voltage for the regulator. The internal loading on this input is typically 300µA when-
ever the regulator is enabled and less than 1µA when the regulator is disabled. If this input is
greater than 2 inches from the main input filter, a 1µF ceramic capacitor is recommended for addi-
tional filtering.
The negative reference for all voltages.
Enable/shutdown input. When EN is asserted high (V
EN
≥
2V), the regulator is enabled. When EN
is asserted low, the regulator is shutdown (V
OUT
=0V). This input is compatible with CMOS logic.
Reference bypass pin. This input is used to connect an external capacitor (C
BYP
) for noise reduc-
tion and to maximize power supply ripple rejection. A 10nF capacitor is recommended for this func-
tion.
The regulated voltage output. An output capacitor of 10µF is recommended to provide the neces-
sary phase compensation for the regulator and also minimize any transient disturbances.
2
3
4
GND
EN
BYP
5
V
OUT
Ordering Information
PART NUMBERING INFORMATION
Standard Finish
Pins
5
Package
SOT23-5
Ordering Part
Number
1
CMPWR161Y
Part Marking
161Y
Lead-free Finish
Ordering Part
Number
1
CMPWR161R
Part Marking
161R
Note 1: Parts are shipped in Tape & Reel form unless otherwise specified.
©
2004 California Micro Devices Corp. All rights reserved.
2
430 N. McCarthy Blvd., Milpitas, CA 95035-5112
L
Tel: 408.263.3214
L
Fax: 408.263.7846
L
www.calmicro.com
01/14/04
CMPWR161
Specifications
ABSOLUTE MAXIMUM RATINGS
PARAMETER
ESD Protection (HBM)
Pin Voltages
V
IN
V
OUT
V
EN
Storage Temperature Range
Operating Temperature Range
Ambient
Junction
RATING
+2000
[GND - 0.5] to [+6.5]
[GND - 0.5] to [+6.5]
[GND - 0.5] to [V
CC
+0.5]
-40 to +150
0 to +70
0 to +125
UNITS
V
V
V
V
°C
°C
°C
STANDARD OPERATING CONDITIONS
PARAMETER
V
IN
Ambient Operating Temperature Range
Load Current
C
OUT
RATING
4.9 to 5.5
0 to +70
0 to 150
10 +10%
UNITS
V
°C
mA
µF
ELECTRICAL OPERATING CHARACTERISTICS
(SEE NOTE 1)
SYMBOL
V
OUT
V
R LOAD
V
R LINE
V
DO
I
IN
I
GND
PARAMETER
Regulator Output Voltage
Load Regulation
Line Regulation
xx
Regulator Dropout Voltage
V
IN
Current
Ground Current
CONDITIONS
0mA < I
LOAD
< 150mA
5mA < I
LOAD
< 150mA, V
IN
=5.0V
I
LOAD
= 5mA, 4.9V < V
CC
< to 5.5V
Minimum V
IN
−
V
OUT
for I
LOAD
= 150mA
Shutdown (Regulator Disabled), V
OUT
tied to GND
Regulator Enabled, I
LOAD
= 0mA
Regulator Enabled, I
LOAD
= 150mA
R
REJ
Ripple Rejection
V
IN
−
V
OUT
= 150mV, I
LOAD
= 150mA,
C
BYP
= 10nF
ƒ
=100Hz
ƒ
=10kHz
2.0
0.5
MIN
4.65
TYP
4.75
0
1
110
0.01
300
300
250
10
500
500
MAX
4.85
UNITS
V
mV
mV
mV
µA
µA
µA
x
x
42
25
x
x
dB
dB
V
V
V
IH
V
IL
EN Input Logic High Threshold
EN Input Logic Low Threshold
Note 1: Operating Characteristics are over Standard Operating Conditions unless otherwise specified.
©
2004 California Micro Devices Corp. All rights reserved.
01/14/044
430 N. McCarthy Blvd., Milpitas, CA 95035-5112
L
Tel: 408.263.3214
L
Fax: 408.263.7846
L
www.calmicro.com
3
CMPWR161
Performance Information
CMPWR161 Typical DC Characteristics (nominal conditions unless specified otherwise)
Nominal Conditions: C
IN
=10µF & 0.1µF, C
OUT
=10µF & 0.1µF, C
BYP
=0.01µF, V
IN
=5.0V, I
LOAD
=5mA.
Dropout Voltage vs. Load (V
OUT
=4.70V)
125
100
75
50
25
0
0
50
100
Load Current [mA]
150
Load Regulation
4.80
4.78
Output Voltage [V]
Dropout [mV]
4.76
4.74
4.72
4.70
0
50
100
150 200
Load Current [mA]
250
300
Line Regulation (5mA Load)
4.78
4.77
Output Voltage [V]
Line Regulation (150mA Load)
4.78
4.77
Output Voltage [V]
4.76
4.75
4.74
4.73
4.72
4.75 4.80 4.85 4.90 4.95 5.00 5.05 5.10
Supply Voltage [V]
4.76
4.75
4.74
4.73
4.72
4.75 4.80 4.85 4.90 4.95 5.00 5.05 5.10
Supply Voltage [V]
Supply Current vs. Voltage (EN = V
IN
)
500
400
300
200
100
0
4.75
Ground Current vs. Output Load
500
Ground Current [uA]
400
300
200
100
0
Supply Current [uA]
5.00
5.25
Supply Voltage [V]
5.50
0
50
100
Load Current [mA]
L
www.calmicro.com
150
©
2004 California Micro Devices Corp. All rights reserved.
4
430 N. McCarthy Blvd., Milpitas, CA 95035-5112
L
Tel: 408.263.3214
L
Fax: 408.263.7846
01/14/04
CMPWR161
Performance Information (cont’d)
CMPWR161 Transient Characteristics (nominal conditions unless specified otherwise)
1mA-150mA Load Step (V
IN
-V
OUT
=250mV)
4.8V – 5.2V Line Step (5mA Load)
Enable Response (no BYP cap)
Disable Response (no BYP cap)
Enable Response (C
BYP
= 10nF)
Disable Response (C
BYP
= 10nF)
EN
©
2004 California Micro Devices Corp. All rights reserved.
01/14/044
430 N. McCarthy Blvd., Milpitas, CA 95035-5112
L
Tel: 408.263.3214
L
Fax: 408.263.7846
L
www.calmicro.com
5
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