CALIFORNIA MICRO DEVICES CMPWR161 Service Manual
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Micropower, Low Noise 4.75V/150mA LDO Regulator
CMPWR161
Features
• Excellent power supply ripple rejection for
V
IN-VOUT
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
Applications
• 5V analog supply for audio CODEC
• Low noise power supply ideal for audio use
• Notebook computers
• Sound cards
• Motherboards
• Set top boxes
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 applications. 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 available with optional lead-free finishing.
Typical Application Circuit
CMPWR161
5V
Supply
Voltage
© 2004 California Micro Devices Corp. All rights reserved.
01/14/04 430 N. McCarthy Blvd., Milpitas, CA 95035-5112 ▲ Tel: 408.263.3214 ▲ Fax: 408.263.7846 ▲ www.calmicro.com 1
C
IN
+
+
-
GND
V
IN
V
EN
1
BYP
µ
F
10nF
OUT
100nF
GND
C
OUT
+
10µF
V
OUT
4.75V@
150mA
Simplified Electrical Schematic
V
IN
EN
BYP
GND
V
REF
4.75V
+
10kHz
-
V
OUT
PACKAGE / PINOUT DIAGRAM
Top Vi ew
CMPWR161
V
GND
EN
IN
1
2
3
5
161Y/R
4
V
OUT
BYP
5-pin SOT23
Note: This drawing is not to scale.
PIN DESCRIPTIONS
PIN NAME DESCRIPTION
1V
2 GND The negative reference for all voltages.
3 EN Enable/shutdown input. When EN is asserted high (V
4 BYP Reference bypass pin. This input is used to connect an external capacitor (C
5V
OUT
Positive input voltage for the regulator. The internal loading on this input is typically 300µA when-
IN
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 additional filtering.
≥ 2V), the regulator is enabled. When EN
EN
is asserted low, the regulator is shutdown (V
tion and to maximize power supply ripple rejection. A 10nF capacitor is recommended for this function.
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.
=0V). This input is compatible with CMOS logic.
OUT
) for noise reduc-
BYP
Ordering Information
PART NUMBERING INFORMATION
Standard Finish Lead-free Finish
Ordering Part
Pins Package
5 SOT23-5 CMPWR161Y 161Y CMPWR161R 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 ▲ Tel: 408.263.3214 ▲ Fax: 408.263.7846 ▲ www.calmicro.com 01/14/04
Number
1
Part Marking
Ordering Part
Number
1
Part M arking
CMPWR161
Specifications
ABSOLUTE MAXIMUM RATINGS
PARAMETER RATING UNITS
ESD Protection (HBM) +
Pin Voltages
V
V
V
IN
OUT
EN
[GND - 0.5] to [+6.5]
[GND - 0.5] to [+6.5]
[GND - 0.5] to [V
Storage Temperature Range -40 to +150 °C
Operating Temperature Range
Ambient
Junction
STANDARD OPERATING CONDITIONS
PARAMETER RATING UNITS
V
IN
Ambient Operating Temperature Range 0 to +70 °C
Load Current 0 to 150 mA
C
OUT
2000 V
+0.5]
CC
0 to +70
0 to +125
4.9 to 5.5 V
10 +10% µF
V
V
V
°C
°C
ELECTRICAL OPERATING CHARACTERISTICS
(SEE NOTE 1)
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
V
OUT
V
R LOAD
V
R LINE
V
I
DO
IN
Regulator Output Voltage 0mA < I
Load Regulation 5mA < I
Line Regulation
xx
Regulator Dropout Voltage
I
LOAD
Minimum V
VIN Current Shutdown (Regulator Disabled), V
< 150mA 4.65 4.75 4.85 V
LOAD
< 150mA, VIN=5.0V 0 mV
LOAD
= 5mA, 4.9V < VCC< to 5.5V 1 mV
− V
OUT
for I
IN
LOAD
= 150mA
OUT
110 250 mV
0.01 10 µA
tied to GND
I
GND
Ground Current Regulator Enabled, I
Regulator Enabled, I
R
REJ
Ripple Rejection
V
C
− V
IN
BYP
= 150mV, I
OUT
= 10nF
ƒ =100Hz
ƒ =10kHz
V
IH
V
EN Input Logic High Threshold 2.0 V
EN Input Logic Low Threshold 0.5 V
IL
Note 1: Operating Characteristics are over Standard Operating Conditions unless otherwise specified.
= 0mA 300 500 µA
LOAD
= 150mA 300 500 µA
LOAD
LOAD
= 150mA,
x
x
42
25
x
dB
dB
x
© 2004 California Micro Devices Corp. All rights reserved.
01/14/044 430 N. McCarthy Blvd., Milpitas, CA 95035-5112 ▲ Tel: 408.263.3214 ▲ Fax: 408.263.7846 ▲ www.calmicro.com 3
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