ROHS AMS2596 Technical data

http://www.BDTIC.com/AMS

Advanced AMS2596 Monolithic SUPER SWITCHER Systems

RoHS compliant

FEATURES APPLICATIONS

•••• 1.25V to 7V fixed Output Voltage in 100mV step •••• LCD monitor

•••• Input voltage range up to 30V •••• LCD TV

•••• Low power standby mode, IQ typically 80µA •••• Positive to negative converter

•••• Excellent line and load regulation specifications •••• On-board switching regulators

•••• Thermal shutdown and current limit protection •••• System Power Supply

•••• 150 kHz fixed frequency internal oscillator •••• High-efficiency step-down (buck) regulator

•••• Adjustable versions output voltage range 1.2V to 25V •••• High-efficiency Pre-regulator for Linear regulator

GENERAL DESCRIPTION

AMS2596 series of regulators are monolithic integrated circuits that provide all the active functions for a step-down (buck)

The switching regulator with internal compensation and soft start .Capable of driving a 3A load with excellent line and load regulation. These devices are available in Adjustable output voltage and fixed output voltages of 1.25V to 7V in 100mV increments. The AMS2596 require a minimum number of external components and simple to use. AMS2596 series operates at a switching frequency of 150 kHz thus allowing smaller sized filter components than what would be needed with lower frequency switching regulators. Available in 8-Leads SOIC-EDP, 5-lead TO-252, 5-lead TO-220/TO-263 packages.

ORDERING INFORMATION

KAGE

PAC

TYPE

TO-263 AMS2596M AMS2596M-XX -25ºC to -125ºC

TO-220 AMS2596T AMS2596T-XX -25ºC to -125ºC

TO-252 AMS2596D AMS2596D-XX -25ºC to -125ºC

SO-8 EDP AMS2596S AMS2596S-XX -25ºC to -125ºC

AMS2596

ADJUSTABLE

AMS2596

FIXEDVOLTAGE

TEMP. RANGE

PIN CONNECTIONS

8L SOIC 5 Lead TO-220 5 Lead TO-252 5 Lead TO-263

SO-Package (S)

Top View Top View Top View Top View

Advanced Monolithic Systems, Inc.

http://www.BDTIC.com/AMS

AMS2596

ABSOLUTE MAXIMUM RATINGS (Note 1)

Maximum Supply Voltage 30V ESD Susceptibility 2 kV Pin Input Voltage -0.3 ≤ V ≤+ 30V Storage Temperature Range -65 ºC to +150 ºC Feedback Pin Voltage -0.3 ≤ V ≤+ 30V Operating Temperature Range -40 ºC ≤ TJ ≤ +125 ºC Output Voltage to GND -1V Junction Temperature Range +150ºC Power Dissipation Internally Limited Lead Temp Range (Soldering 60sec) +215 ºC

ELECTRICAL CHARACTERISTICS

ALL FIXED VOLTAGES

Electrical Characteristics at TA= 25 °C and those with boldface type apply over full Operating Temperature Range, unless

erwise noted.

oth

PARAMETER

Parameters

Output Voltage (Note 2) VIN = 12V VO – 3%

Efficiency VIN = 12V, ILoad = 3A 85 %

ADJUSTABLE

Electrical Characteristics at TA= 25 °C and those with boldface type apply over full Operating Temperature Range, unless otherwise noted.

PARAMETER

Parameters

Feedback Voltage 4.5V ≤ VIN ≤ 30V, 0.2A ≤ ILoad ≤ 3A 1.193

Efficiency VIN = 12V, V

ALL OUTPUT VOLTAGE VERSIONS

Electrical Characteristics at TA= 25 °C, VIN = 12V, ILoad = 500mA and those with boldface type apply over full Operating Temperature Range, unless otherwise noted.

PARAMETER

Device Parameters

Feedback Bias Current Adjustable Versions Only, V

Oscillator Frequency (Note 6) 127 150 173 kHz

Saturation Voltage I

Max Duty Cycle (ON)

Min Duty Cycle (OFF)

Current Limit Peak Current 3.6 / 3.4 4.5 6.9 / 7.5 A

TEST CONDITIONS

= 3V, ILoad = 3A 85 %

OUT

TEST CONDITIONS

= 1.3V 10 50 / 100 nA

= 3A 1.16 1.4 / 1.5 V

OUT

(Note 6)

(Note 7)

Min. Typ. Max.

1.180

Min. Typ. Max.

AMS2596

(2)

AMS2596

1.230 1.267

AMS2596

100

VO + 3% V

1.280

Units

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http://www.BDTIC.com/AMS

ELECTRICAL CHARACTERISTICS (continued)

ALL OUTPUT VOLTAGE (continued)

AMS2596

PARAMETER

Output Leakage Current Output = 0V (Note 8)

Quiescent Current (Note 6) 5 10 mA

Standby Quiescent Current ON/OFF pin = 5V (OFF) 80 200

Thermal Resistance TO-252 Package, Junction to Ambient (Note 10)

ON/OFF Control

ON/OFF Pin Logic Input

Threshold Voltage

ON/OFF Pin Input Current V

TEST CONDITIONS

AMS2596

Min. Typ. Max.

Units

Output = -1V

TO-263 Package, Junction to Ambient (Note 9)

TO-220 Package, Junction to Ambient (Note 8)

SO- 8 EDP Package, Junction to Ambient (Note 11)

250

ºC/W

µA

Low (Regular ON)

High (Regular OFF)

= 2.5V (Regular OFF)

LOGIC

= 0.5V (Regular ON)

LOGIC

1.3

0.02

0.6

2.0

µA

e 1: Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Operating Ratings indicate

Not

conditions for which the device is intended to be functional, but do not guarantee specific performance limits. For guaranteed specifications and test conditions, see the Electrical Characteristics.

Note 2: VO = Output Voltage specified from 1.25V to 7V in 100mV increments.

e 3: Typical numbers are at 25ºC and represent the most likely norm.

Not Note 4: All limits guaranteed at room temperature (standard type face) and at temperature extremes (bold type face). All room

temperature limits are 100% production tested. All limits at temperature extremes are guaranteed via correlation using standard Statistical Quality Control (SQC) methods. All limits are used to calculate Average Outgoing Quality Level (AOQL).

Note 5: Feedback pin removed from output and connected to 0V to force the output transistor switch ON. Note 6: Feedback pin removed from output and connected to 12V for Fixed and Adjustable version, to force the output

transistor switch OFF.

Note 7: With output transistor switch turned off. Note 8: Junction to ambient thermal resistance (no external heat sink) for the TO-220 package mounted vertically, with the leads

soldered to a printed circuit board with (1 oz.) and a heat sink approximately 1 in2. Note 9. Junction to ambient thermal resistance with the TO-263 package tab soldered to a double side printed circuit board with

2.5 in2 of (1 oz.) copper area. Note 10. Junction to ambient thermal resistance with the TO-252 package tab soldered to a single sided printed circuit board with 2.5 in2 of (1 oz.) copper area. Note 11. Junction to ambient thermal resistance with the SO-8 EDP package soldered to a double sided printed circuit board 5 via under the package paddle crossing to the other side of PCB on 2.5 in2 1oz Cu.

Advanced Monolithic Systems, Inc.

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PIN DESIGNATION and FUNCTION

AMS2596M, T&D packages Pin Number Pin Name Pin Function

1 VIN Supply Voltage (Input): Unregulated +4V to 30V supply voltage.

2 LX

3 (TAB) GND Ground

4 F/B

5 SHDN

Switch (Output): Emitter of NPN output switch. Connect to external storage inductor (LX) and Shottky diode.

Feedback (Input): Output voltage feedback to regulator. Connect to output of supply for fixed versions. Connect to 1.23V tap of resistive divider for adjustable versions. Shutdown (Input): Logic low enables regulator. Logic high (> 2.4V) shuts down regulator.

PIN DESIGNATION and FUNCTION

AMS2596S (8-Pin SOIC) Pin Number Pin Name Pin Function

4 VIN Supply Voltage (Input): Unregulated +4V to 30V supply voltage. 5&6 LX Switch (Output) Connect to external storage inductor (LX) and Shottky diode. 7&8 GND Ground

1 F/B

2 SHDN Shutdown, Logic low enables regulator. Logic high shuts down regulator.

Feedback : Output voltage feedback to regulator. Connect to tap of resistive divider for adjustable versions.

User Guidelines

In Switching Regulators applications the PCB layout is very important in order to get a stable output and minimum current loops and trace inductance. To minimize the problems associated with inductance and fast transient currents from the Input Capacitor to the device and from the Schottky diode to the device should be kept very short. Also the ground plane should be as wide as possible or use a single point of grounding. A special attention should be given to the location of the inductor, to be kept away from sensitive lines such as Feedback and Enable. If the Enable pin is not used it is recommended to have it connected to Ground. The output capacitor should be connected close to the package leads and the feedback sense point should be taken as close as possible to the loading point to eliminate the errors caused by voltage drop across the PCB traces. AMS2596 it operates with all kind of Output Capacitors including Low ESR (Equivalent Series Resistance) such as ceramic capacitors and also can take very large capacitor values. The voltage rating of the capacitor should be minimum 1.5 times the output voltage. The input capacitor can be Aluminum or Tantalum 680µF or 470µF and should be places as close as possible to

IC input pin.

the

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ADJUSTABLE OUTPUT

FIG. 1

FIXED VOLTAGE OUTPUT

AMS2596



REFOUT

 



+= 1



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+ 7 hidden pages

ROHS AMS2596 Technical data

Specifications and Main Features

Frequently Asked Questions

User Manual