Analog Devices ADP122 Evaluation Board ADP122-3.3-EVALZ ADP122-3.3-EVALZ データシート
製品コード
ADP122-3.3-EVALZ
5.5 V Input, 300 mA, Low Quiescent
Current, CMOS Linear Regulator
Data Sheet
Rev. E
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responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other
rights of third parties that may result from its use. Specifications subject to change without notice. No
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Trademarks and registered trademarks are the property of their respective owners.
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Tel: 781.329.4700
Tel: 781.329.4700
Fax: 781.461.3113 ©2009–2012 Analog Devices, Inc. All rights reserved.
FEATURES
Input voltage supply range: 2.3 V to 5.5 V
300 mA maximum output current
Fixed and adjustable output voltage versions
Very low dropout voltage: 85 mV at 300 mA load
Low quiescent current: 45 µA at no load
Low shutdown current: <1 µA
Initial accuracy: ±1% accuracy
Up to 31 fixed-output voltage options available from
300 mA maximum output current
Fixed and adjustable output voltage versions
Very low dropout voltage: 85 mV at 300 mA load
Low quiescent current: 45 µA at no load
Low shutdown current: <1 µA
Initial accuracy: ±1% accuracy
Up to 31 fixed-output voltage options available from
1.75 V to 3.3 V
Adjustable-output voltage range
0.8 V to 5.0 V (ADP123)
Excellent PSRR performance: 60 dB at 100 kHz
Excellent load/line transient response
Optimized for small 1.0 μF ceramic capacitors
Current limit and thermal overload protection
Logic controlled enable
Compact packages: 5-lead TSOT and 6-lead 2 mm × 2 mm LFCSP
Excellent load/line transient response
Optimized for small 1.0 μF ceramic capacitors
Current limit and thermal overload protection
Logic controlled enable
Compact packages: 5-lead TSOT and 6-lead 2 mm × 2 mm LFCSP
APPLICATIONS
Digital camera and audio devices
Portable and battery-powered equipment
Automatic meter reading (AMR) meters
GPS and location management units
Medical instrumentation
Point-of-sale equipment
Portable and battery-powered equipment
Automatic meter reading (AMR) meters
GPS and location management units
Medical instrumentation
Point-of-sale equipment
GENERAL DESCRIPTION
The ADP122/ADP123 are low quiescent current, low dropout
linear regulators. They are designed to operate from an input
voltage between 2.3 V and 5.5 V and to provide up to 300 mA of
output current. The low 85 mV dropout voltage at a 300 mA load
improves efficiency and allows operation over a wide input
voltage range.
The low 170 μA of quiescent current at full load makes the ADP122
ideal for battery-operated portable equipment.
The ADP122 is capable of 31 fixed output voltages from 1.75 V
to 3.3 V. The ADP123 is the adjustable version of the device and
allows the output voltage to be set between 0.8 V and 5.0 V by
an external voltage divider.
The ADP122/ADP123 are specifically designed for stable operation
with tiny 1 µF ceramic input and output capacitors to meet the
requirements of high performance, space constrained applications.
linear regulators. They are designed to operate from an input
voltage between 2.3 V and 5.5 V and to provide up to 300 mA of
output current. The low 85 mV dropout voltage at a 300 mA load
improves efficiency and allows operation over a wide input
voltage range.
The low 170 μA of quiescent current at full load makes the ADP122
ideal for battery-operated portable equipment.
The ADP122 is capable of 31 fixed output voltages from 1.75 V
to 3.3 V. The ADP123 is the adjustable version of the device and
allows the output voltage to be set between 0.8 V and 5.0 V by
an external voltage divider.
The ADP122/ADP123 are specifically designed for stable operation
with tiny 1 µF ceramic input and output capacitors to meet the
requirements of high performance, space constrained applications.
TYPICAL APPLICATION CIRCUITS
2
3
1
4
5
V
IN
= 2.3V TO 5.5V
V
OUT
= 1.8V
VIN
GND
EN
VOUT
NC
C
IN
1µF
C
OUT
1µF
ADP122
08399-
001
OFF
ON
Figure 1. ADP122 with Fixed Output Voltage (TSOT Version)
V
IN
= 2.3V TO 5.5V
V
OUT
= 0.5V(1 + R1/R2)
R1
R2
C
IN
1µF
C
OUT
1µF
08399-
002
2
3
1
4
5
VIN
GND
EN
VOUT
ADJ
ADP123
OFF
ON
Figure 2. ADP123 with Adjustable Output Voltage (TSOT Version)
08399-
135
NC = NOT CONNECT. THIS PIN CAN BE LEFT FLOATING
OR CONNECTED TO GROUND.
OR CONNECTED TO GROUND.
TOP VIEW
(Not to Scale)
ADP122
3
GND
1
VOUT
2
NC
4
EN
6 VIN = 2.3V TO 5.5V
VOUT = 1.8V
C1
1µF
1µF
GND
ON
OFF
VIN
5
NC
C2
1µF
1µF
GND
GND
Figure 3. ADP122 with Fixed Output Voltage (LFCSP Version)
08399-
136
NC = NOT CONNECT. THIS PIN CAN BE LEFT FLOATING
OR CONNECTED TO GROUND.
OR CONNECTED TO GROUND.
TOP VIEW
(Not to Scale)
ADP123
3
GND
1
VOUT
2
ADJ
4
EN
6 VIN = 2.3V TO 5.5V
VOUT = 0.5V (1 + R1/R2)
C1
1µF
1µF
GND
ON
OFF
VIN
5
NC
C2
1µF
1µF
R1
R2
GND
GND
GND
Figure 4. ADP123 with Adjustable Output Voltage (LFCSP Version)
The ADP122/ADP123 have an internal soft start that gives a
constant start-up time of 350 µs. Short-circuit protection and
thermal overload protection circuits prevent damage in adverse
conditions. The ADP122/ADP123 are available in a tiny, 5-lead
TSOT package and 6-lead LFCSP package for the smallest
footprint solution to meet a variety of portable applications.
constant start-up time of 350 µs. Short-circuit protection and
thermal overload protection circuits prevent damage in adverse
conditions. The ADP122/ADP123 are available in a tiny, 5-lead
TSOT package and 6-lead LFCSP package for the smallest
footprint solution to meet a variety of portable applications.