ap1538sg-u Diodes, Inc., ap1538sg-u Datasheet

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ap1538sg-u

Manufacturer Part Number
ap1538sg-u
Description
18v 3a 300khz Buck Converter
Manufacturer
Diodes, Inc.
Datasheet
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Features
Applications
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Ordering Information
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Notes:
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AP1538 Rev. 2
AP1538SDPG-13
AP1538SDPG-U
AP1538SG-13
AP1538SG-U
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
Device
1. EU Directive 2002/95/EC (RoHS). All applicable RoHS exemptions applied, see EU Directive 2002/95/EC Annex Notes.
2. Pad layout as shown on Diodes Inc. suggested pad layout document AP02001, which can be found on our website at
Input voltage : 3.6V to 18V
Output voltage : 0.8V to V
Output current : up to 3A
Duty ratio: 0% to 99% PWM control
Oscillation frequency: 300KHz typical
Soft-start like, Current limit and Enable function
Thermal Shutdown function
Built-in internal SW P-channel MOS
SOP-8L and SOP-8L-DEP: Available in “Green”
Molding Compound (No Br, Sb)
Lead Free Finish / RoHS Compliant (Note 1)
PC Motherboard
LCD Monitor
Graphic Card
DVD-Video Player
Telecom Equipment
ADSL Modem
Printer and other Peripheral Equipment
Microprocessor core supply
http://www.diodes.com/datasheets/ap02001.pdf.
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Package
SDP : SOP-8L-DEP
Code
SDP
SDP
S : SOP-8L
S
S
Package
CC
SOP-8L-DEP
SOP-8L-DEP
Packaging
(Note 2)
SOP-8L
SOP-8L
AP 1538 XXX G - X
www.diodes.com
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Lead Free
G : Green
1 of 14
Quantity Part Number
100
100
NA
NA
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General Description
AP1538 consists of step-down switching regulator with PWM
control. These devices include a reference voltage source,
oscillation circuit, error amplifier, internal PMOS.
AP1538 provides low-ripple power, high efficiency, and excellent
transient characteristics. The PWM control circuit is able to vary
the duty ratio linearly from 0 up to 99%. This converter also
contains an error amplifier circuit as well as a soft-start circuit that
prevents overshoot at startup.
current protect function and a short circuit protect function are built
inside, and when OCP or SCP happens, the operation frequency
will be reduced from 300KHz to 50KHz. Also, an internal
compensation block is built in to minimum external component
count.
With the addition of an internal P-channel Power MOS, a coil,
capacitors, and a diode connected externally, these ICs can
function as step-down switching regulators. They serve as ideal
power supply units for portable devices when coupled with the
SOP-8L and SOP-8L-DEP mini-packages, providing such
outstanding features as low current consumption. Since this
converter can accommodate an input voltage up to 18V, it is also
suitable for the operation via an AC adapter.
Tube
18V 3A 300KHz BUCK CONVERTER
Suffix
NA
NA
-U
-U
13 : Tape & Reel
U : Tube
Packing
2500/Tape & Reel
2500/Tape & Reel
Quantity
13” Tape and Reel
NA
NA
An enable function, an over
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©
AP1538
Diodes Incorporated
JUNE 2008
Part Number
Suffix
-13
-13
NA
NA
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ap1538sg-u Summary of contents

Page 1

... Microprocessor core supply x ³ Ordering Information ³ Package S : SOP-8L SDP : SOP-8L-DEP Package Device Code AP1538SG-U S AP1538SG-13 S AP1538SDPG-U SDP SOP-8L-DEP AP1538SDPG-13 SDP SOP-8L-DEP Notes Directive 2002/95/EC (RoHS). All applicable RoHS exemptions applied, see EU Directive 2002/95/EC Annex Notes. 2. Pad layout as shown on Diodes Inc. suggested pad layout document AP02001, which can be found on our website at http://www.diodes.com/datasheets/ap02001.pdf. ³ ...

Page 2

Pin Assignments (1) SOP-8L ³ ( Top View ) OCSET Notes: 3. Exposed pad 1 is connected to VSS and exposed pad 2 is connected ...

Page 3

Block Diagram Vcc Thermal Shutdown Absolute Maximum Ratings Symbol ESD HBM Human Body Model ESD Protection ESD MM Machine Model ESD Protection V V Pin Voltage Feedback Pin Voltage Pin Voltage EN V ...

Page 4

Electrical Characteristics (V = 12V 25°C, unl ess otherwise specified Symbol Parameter V Feedback Voltage FB I Feedback Bias Current FB Current Consumption During I SHDN Power Off ¨V OUT Line Regulation / V IN ...

Page 5

Typical Application Circuit OCSET OCSET 3K Option C IN 470uF R EN CVcc 100K 0.1uF C EN 0.1uF Notes: 6. Suggested DIODES Power Schottky P/N: B340 series or PDS340. 7. Suggested C for V < ...

Page 6

Typical Performance Characteristics V vs. Frequency 3.3V 0.2A) OUT OUT 326 324 322 320 318 316 314 312 310 308 306 (V) IN Line Regulation (V = ...

Page 7

Typical Performance Characteristics Current Limit vs. Temperature (V =12V, R =6.8k) IN OCSET 9.0 8.5 8.0 7.5 7.0 6.5 6.0 5.5 5.0 4.5 4.0 - Ambient Temperature (C) V Ripple OUT (V = 12V 3.3V, ...

Page 8

Test Circuit open OUTPUT V CC OCSET Enable function test OUTPUT V CC OCSET + Operation function test ³ AP1538 Rev. 2 18V 3A 300KHz BUCK CONVERTER open ...

Page 9

Functional Description PWM Control The AP1538 is a DC/DC converter that employs pulse width modulation (PWM) scheme. Its pulse width varies in the range 99%, based on the output current loading. The output ripple voltage caused ...

Page 10

Functional Description Keep the gap of exposed pads from short circuit. Top Side Layout Guide Use vias to conduct the heat into the backside of PCB layer. The heat sink at output (SW) pins should be allowed for maximum ...

Page 11

Functional Description Option Figure: Layout numbering comparison. ³ AP1538 Rev. 2 18V 3A 300KHz BUCK CONVERTER (Continued) Vcc Output AP1538 FB OCSET www.diodes.com AP1538 ...

Page 12

Marking Information (1) SOP-8L Logo Part No. (2) SOP-8L-DEP ³ Logo Part No. ³ ³ AP1538 Rev. 2 18V 3A 300KHz BUCK CONVERTER ( Top View ) Green AP1538 YYWW X X Internal code Xth ...

Page 13

Package Information (1) SOP-8L ÊCÌC ÃÁÆÂÃÁÈ ÄÁÅÊ  ÇÁËÃÂÈÁÆÃ Ë ÀÃÁÇÄ É ÀÄÁÅÊ ßô÷³ãôø³åøö »èüͳ ¼ (2) SOP-8L-DEP Ë È Ç Ä ÃÁÆÂÃÁÈ ÄÁÅÊç Á ÇÁËÈÂÇÁÌÈ ÅÁÃÈç Á ÄÁÄÈç Á Ä Ç ØëãâæØ׳ãÔ× ÃÁÅÃ Ë È ÄÁÊ ÄÁÊ Ö ß Õ ³ üø ³ AP1538 Rev. ...

Page 14

Diodes Incorporated and its subsidiaries reserve the right to make modifications, enhancements, improvements, corrections or other changes without further notice to any product herein. Diodes Incorporated does not assume any liability arising out of the application or use of ...

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