5.5 V Input, 500 mA, Low Quiescent
Current, CMOS Linear Regulators
Data Sheet
ADP124/ADP125
FEATURES TYPICAL APPLICATION CIRCUITS
Input voltage supply range: 2.3 V to 5.5 V
1 VOUT VIN 8
V = 3.3V V = 5.5V
OUT IN
500 mA maximum output current
ADP124
Fixed and adjustable output voltage versions 2 VOUT VIN 7
C2 C1
1% initial accuracy
VOUT
NC
3 6
SENSE
Up to 31 fixed-output voltage options available
ON
from 1.75 V to 3.3 V
4 5
GND EN
OFF
Adjustable-output voltage range from 0.8 V to 5.0 V
Very low dropout voltage: 130 mV
Figure 1. ADP124 with Fixed Output Voltage
Low quiescent current: 45 A
Low shutdown current: <1 A
V = 3.3V
OUT
1 8
VOUT VIN V = 5.5V
Excellent PSRR performance: 60 dB at 100 kHz
IN
ADP125
Excellent load/line transient response
2 VOUT VIN 7
C2 R1 C1
Optimized for small 1.0 F ceramic capacitors
NC
Current limit and thermal overload protection 3 ADJ 6
Logic controlled enable R2 ON
4 5
GND EN
OFF
Compact 8-lead exposed paddle MSOP and LFCSP packages
APPLICATIONS
Figure 2. ADP125 with Adjustable Output Voltage
Digital camera and audio devices
Portable and battery-powered equipment
Automatic meter reading (AMR) meters
GPS and location management units
Medical instrumentation
Point of load power
GENERAL DESCRIPTION
The ADP124/ADP125 are low quiescent current, low dropout The ADP124/ADP125 are specifically designed for stable
linear regulators. They are designed to operate from an input operation with tiny 1 F ceramic input and output capacitors to
voltage between 2.3 V and 5.5 V and to provide up to 500 mA meet the requirements of high performance, space constrained
of output current. The low 130 mV dropout voltage at a 500 mA applications.
load improves efficiency and allows operation over a wide input
The ADP124/ADP125 have an internal soft start that gives a
voltage range.
constant start-up time of 350 s. Short-circuit protection and
The low 210 A of quiescent current with a 500 mA load makes the thermal overload protection circuits prevent damage in adverse
ADP124/ADP125 ideal for battery-operated portable equipment. conditions. The ADP124/ADP125 are available in 8-lead
exposed paddle MSOP and LFCSP packages. When compared
The ADP124 is capable of 31 fixed-output voltages from 1.75 V
with the standard MSOP and LFCSP packages, the exposed
to 3.3 V. The ADP125 is the adjustable version of the device and
paddle MSOP and LFCSP packages have lower thermal resistance
allows the output voltage to be set between 0.8 V and 5.0 V by
( ). The lower thermal resistance package allows the ADP124/
JA
an external voltage divider.
ADP125 to meet the needs of a variety of portable applications
while minimizing the rise in junction temperature.
Rev. D Document Feedback
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08476-002 08476-001ADP124/ADP125 Data Sheet
TABLE OF CONTENTS
Features .............................................................................................. 1 Typical Performance Characteristics ..............................................7
Applications ....................................................................................... 1 Theory of Operation ...................................................................... 11
Typical Application Circuits ............................................................ 1 Applications Information .............................................................. 12
General Description ......................................................................... 1 Capacitor Selection .................................................................... 12
Revision History ............................................................................... 2 Undervoltage Lockout ............................................................... 13
Specifications ..................................................................................... 3 Enable Feature ............................................................................ 13
Recommended Capacitor Specifications ................................... 4 Current Limit and Thermal Overload Protection ................. 14
Absolute Maximum Ratings ............................................................ 5 Thermal Considerations ............................................................ 14
Thermal Data ................................................................................ 5 Junction Temperature Calculations ......................................... 15
Thermal Resistance ...................................................................... 5 Printed Circuit Board Layout Considerations........................ 16
ESD Caution .................................................................................. 5 Outline Dimensions ....................................................................... 17
Pin Configurations and Function Descriptions ........................... 6 Ordering Guide .......................................................................... 18
REVISION HISTORY
12/14Rev. C to Rev. D
Updated Figure 46; Outline Dimensions ..................................... 17
Changes to Ordering Guide .......................................................... 18
6/12Rev. B to Rev. C
Changes to Table 3 ............................................................................ 5
Updated Outline Dimensions ....................................................... 17
4/12Rev. A to Rev. B
Updated Outline Dimensions ....................................................... 17
Changes to Ordering Guide .......................................................... 18
9/10Rev. 0 to Rev. A
Added 8-Lead LFCSP Package ..................................... Throughout
Added Figure 4 and Figure 6 (Renumbered Sequentially) ......... 6
Changes to Thermal Conditions Section and Table 6 ............... 14
Added Table 7 .................................................................................. 14
Changes to Junction Temperature Calculations Section ........... 15
Added Figure 44 .............................................................................. 16
Updated Outline Dimensions ....................................................... 17
Changes to Ordering Guide .......................................................... 18
12/09Revision 0: Initial Version
Rev. D | Page 2 of 20