DS2501 Advanced Monolithic Systems, DS2501 Datasheet

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DS2501

Manufacturer Part Number
DS2501
Description
1A VERY LOW DROPOUT VOLTAGE REGULATORS
Manufacturer
Advanced Monolithic Systems
Datasheet

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FEATURES
GENERAL DESCRIPTION
The
current. The dropout voltage of the device is 100mV at light loads and rising to 200mV at 500mA output current. A second
input voltage of 1.2V or greater than the output is required to achieve this dropout. The AMS2501/AMS2502 can also be used
as a single supply device by connecting pin1 and pin 8 together. In this case the dropout voltage will be typically 1.2V.
variations due to load changes. AMS2502 has an additional feature of an On/Off pin to keep the device in stand-by mode.
The typical load regulation, measured at the Sense pin, for a load current step of 100mA to 1A is less than 1mV.
The AMS2501/AMS2502 series has fast transient response. On the AMS2502 the reference voltage is brought out to allow
the user to add a bypass capacitor for lower noise and transient response improvement.
The AMS2501/AMS2502 series are ideal for generating supplies of 1.25V to 3V where both 5V and 3.3V supplies are
available.
The AMS2501/AMS2502 devices are offered in 8 lead SOIC package.
ORDERING INFORMATION:
The AMS2501/AMS2502 series of adjustable and fixed low dropout voltage regulators are designed to provide 1A output
New features have been added to the AMS2501: a remote Sense pin is brought out virtually eliminating output voltage
AMS2501CS
AMS2501CS-1.5
AMS2501CS-1.8
AMS2501CS-2.5
AMS2501CS-2.85
AMS2501CS-3.0
AMS2501CS-3.3
AMS2501CS-3.5
AMS2501CS-5.0
Adjustable or Fixed Output
Output Current of 1A
Low Dropout, typ. 200mV at 500mA Output Current
Fast Transient Response
Remote Sense
1.5V, 1.8V, 2.5V, 2.85V, 3.0V, 3.3V, 3.5V and 5.0V
Advanced
Monolithic
Systems
Advanced Monolithic Systems, Inc. www.advanced-monolithic.com
PACKAGE TYPE
8 LEAD SO-8
AMS2502CS
AMS2502CS-1.5
AMS2502CS-1.8
AMS2502CS-2.5
AMS2502CS-2.85
AMS2502CS-3.0
AMS2502CS-3.3
AMS2502CS-3.5
AMS2502CS-5.0
TEMPERATURE RANGE
OPERATING JUNCTION
1A VERY LOW DROPOUT VOLTAGE REGULATORS
0 to 125 C
0 to 125 C
0 to 125 C
0 to 125 C
0 to 125 C
0 to 125 C
0 to 125 C
0 to 125 C
0 to 125 C
APPLICATIONS
High Efficiency Current Regulators
Adjustable Power Supply
Notebook/Personal Computer Supplies
Post Regulators for Switching Supplies
Audio/Video/Modem Card Supply
Phone (925) 443-0722 Fax (925) 443-0723
AMS2501/AMS2502
POWER IN
POWER IN
PIN CONNECTIONS
OUTPUT
OUTPUT
OUTPUT
OUTPUT
SENSE
SENSE
AMS2501 8L SOIC
AMS2502 8L SOIC
1
2
3
4
1
2
3
4
Top View
Top View
8
7
6 ADJ/GND
5
8
7
6 ADJ/GND
5
CONTROL IN
N/C
N/C
CONTROL IN
BYPASS
ON/OFF

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DS2501 Summary of contents

Page 1

... AMS2502CS-2.85 AMS2501CS-3.0 AMS2502CS-3.0 AMS2501CS-3.3 AMS2502CS-3.3 AMS2501CS-3.5 AMS2502CS-3.5 AMS2501CS-5.0 AMS2502CS-5.0 Advanced Monolithic Systems, Inc. www.advanced-monolithic.com AMS2501/AMS2502 1A VERY LOW DROPOUT VOLTAGE REGULATORS APPLICATIONS High Efficiency Current Regulators Post Regulators for Switching Supplies Audio/Video/Modem Card Supply Adjustable Power Supply Notebook/Personal Computer Supplies OPERATING JUNCTION ...

Page 2

... Adjust Pin Current AMS2501/AMS2502 Current Limit AMS2501/AMS2502-1.5/- 1.8/-2.5/-2.85/-3.0/-3.3/- 3.5/-5.0 Ripple Rejection AMS2501/AMS2502-1.5/- 1.8/-2.5/-2.85/-3.0/-3.3/- 3.5/-5.0 Advanced Monolithic Systems, Inc. www.advanced-monolithic.com (Note 1) 7V Soldering information 13V Lead Temperature (10 sec) Thermal Resistance SO-8 package 125 150 +150 C = +25°C unless otherwise specified. J Conditions ...

Page 3

... Kelvin sense the output voltage at the load. On/Off (Pin 5 AMS2502 only): This pin puts the device in a stand-by mode. Reference (Pin 7 AMS2502 only): This pin allows the user to add a bypass capacitor on the reference voltage. Advanced Monolithic Systems, Inc. www.advanced-monolithic.com = +25°C unless otherwise specified. J Conditions T = 25° ...

Page 4

... This devices can hold 1% accuracy over the full temperature range and load current range, guaranteed, when combined with ratiometrically accurate internal divider resistors and operating with an input/output differential of well under 1V. Advanced Monolithic Systems, Inc. www.advanced-monolithic.com AMS2501/AMS2502 Typical applications for the AMS2501/AMS2502 include 3.3V to 2.5V conversion with a 5V control supply 4.2V conversion with a 12V control supply ...

Page 5

... The reference voltage is brought out specifically to allow this capability. Advanced Monolithic Systems, Inc. www.advanced-monolithic.com Some of the loads generate large high frequency current transients. The load current step contains higher order frequency components than the output coupling network must handle until the regulator throttles to the load current level ...

Page 6

... Careful consideration must be given to all sources of thermal resistance from junction to ambient. Advanced Monolithic Systems, Inc. www.advanced-monolithic.com Control section can run up to 125 C, and the Power section can run up to 150 C. Due to the thermal gradients between the power transistor and the control circuitry there is a significant difference in thermal resistance between the Control and Power sections ...

Page 7

... OUTPUT CURRENT (A) Reference Voltage vs Temperature 1.258 1.256 1.254 1.252 1.250 1.248 1.246 1.244 1.242 -50 -25 0 TEMPERATURE (° C) Advanced Monolithic Systems, Inc. www.advanced-monolithic.com Minimum Control Voltage 125° 1.4 0.2 0.4 0.6 0.8 0 OUTPUT CURRENT (A) 50 V/DIV LOAD 100 125 150 AMS2501/AMS2502 ...

Page 8

... DOES NOT INCLUDE MOLD FLASH. MOLD FLASH SHALL NOT EXCEED 0.006" (0.152mm) PER SIDE **DIMENSION DOES NOT INCLUDE INTERLEAD FLASH. INTERLEAD FLASH SHALL NOT EXCEED 0.010" (0.254mm) PER SIDE Advanced Monolithic Systems, Inc. www.advanced-monolithic.com 8 LEAD SOIC PLASTIC PACKAGE ( ...

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