AP1537 ANACHIP [Anachip Corp], AP1537 Datasheet

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AP1537

Manufacturer Part Number
AP1537
Description
PWM Control 3A Step-Down Converter
Manufacturer
ANACHIP [Anachip Corp]
Datasheet
1.AP1537.pdf (7 pages)
PWM Control 3A Step-Down Converter
- Input voltage: 3.6V to 18V.
- Output voltage: 0.8V to V
- Duty ratio: 0% to 100% PWM control
- Oscillation frequency: 500KHz typ.
- Soft-start, Current Limit, Enable function
- Thermal Shutdown function
- Built-in internal SW P-channel MOS
- Low ESR output capacitor (Multi-layer chip
- SOP-8L Pb-Free Package.
- PC Motherboard
- LCD Monitor
- Graphic Card
- DVD-Video Player
- Telecom Equipment
- ADSL Modem
- Printer and other Peripheral Equipment
- Microprocessor core supply
- Networking power supply
This datasheet contains new product information. Anachip Corp. reserves the rights to modify the product specification without notice. No liability is assumed as a result of the use of
this product. No rights under any patent accompany the sale of the product.
capacitor (MLCC)) application
Features
Applications
Pin Assignments
Comp
V
EN
FB
CC
)
1
2
3
4
AP1537
CC
.
8
7
6
5
Vss
Vss
Output
Output
1/7
AP1537 consists of step-down switching regulator
with PWM control. These devices include a reference
voltage source, oscillation circuit, error amplifier,
internal PMOS and etc.
AP1537 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 100%. This converter also contains an
error amplifier circuit as well as a soft-start circuit that
prevents overshoot at startup. An enable function,
an over 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 500KHz 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
mini-package, 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.
Output
Name
Comp
V
V
FB
EN
General Description
Pin Descriptions
CC
SS
5、6
7、8 GND Pin
Pin
1
2
3
4
Feedback pin
Power-off pin
H: Normal operation
L: Step-down operation stopped
Compensation pin
IC power supply pin
Switch
inductor/diode here. Minimize trace
area at this pin to reduce EMI.
(Step-down operation)
(All circuits deactivated)
Pin.
Description
Rev. 1. 3
Connect
AP1537
May 09, 2006
external

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AP1537 Summary of contents

Page 1

... PWM control. These devices include a reference voltage source, oscillation circuit, error amplifier, internal PMOS and etc. AP1537 provides low-ripple power, high efficiency, and excellent transient characteristics. The PWM control circuit is able to vary the duty ratio linearly from 100%. This converter also contains an error amplifier circuit as well as a soft-start circuit that prevents overshoot at startup ...

Page 2

... Anachip Corp. www.anachip.com.tw AP 1537 X X Package Packing S: SOP-8L Blank : Tube A : Taping Output Oscillation Circuit PWM-Switched Control Circuit Parameter 2/7 AP1537 Reference Voltage Source with Soft Start + FB - 100uA Vss Comp Rating Unit ...

Page 3

... OUT OUT L1 Vcc Output 22uH AP1537 10nF FB EN Comp 1800pF D1 Note (1 OUT =0.7K~5K ohm B V =12V, I =3A IN MAX 2.5V 3.3V 18uH 22uH 3/7 AP1537 Min. Typ. Max. Unit 3 0.784 0.8 0.816 V - 0.1 0.5 µA 3 µ 0.2 0.5 % 400 500 600 KHz 40 - ...

Page 4

... PWM Control 3A Step-Down Converter Typical Performance Characteristics AP1537 Vin v.s. Frequency (Vout=3.3V; Iout=0.2A) 450 445 440 435 430 425 420 415 410 405 400 Vin (V) AP1537 Line Regulation ( Iout=0.2A) 3.40 3.35 3.30 3.25 3.20 3.15 3. Vin(V) AP1537 Efficiency 100 0.0 1.0 Iout (A) Anachip Corp. ...

Page 5

... PWM Control 3A Step-Down Converter Typical Performance Characteristics (Continued) AP1537 Vout Ripple (Vin=12V; Vout=5V; Iout=0.2A) Test Circuit open OUTPUT VCC Comp EN A VSS Enable function test OUTPUT FB VCC + EN - VSS Comp Operation function test Anachip Corp. www.anachip.com.tw open FB A open + - Feedback function test ...

Page 6

... Function Description PWM Control The AP1537 consists of DC/DC converters that employ a pulse-width modulation (PWM) system. In converters of the AP1537, the pulse width varies in a range from 0 to 100%, according to the load current. The ripple voltage produced by the switching can easily be removed through a filter because the switching frequency remains constant ...

Page 7

... 7/7 AP1537 L 7 (4X) VIEW "A" Nom. Max. 0.063 0.069 - 0.100 0.057 0.059 0.016 0.020 0.008 0.010 0.199 0.209 0.154 0.161 0.050 - 0.236 0.244 0.028 0.050 - 0.004 Rev. 1.3 May 09, 2006 ...

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