Diodes AP3585A/B/C - Manual

AP3585A/B/C
Document number: DS36819 Rev. 1 - 2
1 of 18
www.diodes.com
January 2014
© Diodes Incorporated
AP3585A/B/C
A Product Line of
Diodes Incorporated
NEW PROD
UC
T
SINGLE PHASE SYNCHRONOUS BUCK PWM CONTROLLER
Description
The AP3585A/B/C is a compact synchronous-rectified buck controller
specifically designed to operate from 4.5V to 13.2V supply voltage
and deliver high-quality output voltage as low as 0.8V (AP3585A) or
0.6V (AP3585B/C). This SO-8EP device operates at fixed
300kHz/200kHz frequency and provides an optimal level of
integration to reduce size and cost of the power supply.
This controller integrates internal MOSFET drivers that support
12V+12V bootstrapped voltage for high- efficiency power conversion.
The bootstrap diode is built-in to simplify the circuit design and
minimize external part count.
This controller provides single feedback loop, voltage-mode control
with fast transient response. The error amplifier features a 10MHz
gain-bandwidth product and 6V/μs slew rate which enables high
converter bandwidth for fast transient performance.
Other features include internal soft-start, under voltage protection,
over current protection and shutdown function. With afore mentioned
functions, this part provides customers a compact, high efficiency,
well-protected and cost-effective solution.
The AP3585A/B/C is available in SO-8 and SO-8EP packages.
Features

Supply Voltage: 4.5V to 13.2V
V
IN
Input Range: 3.3V to 12V
0.8V/0.6V to 80% of V
IN
Output Range
Internal Reference: 0.8V/0.6V
 Simple Single-loop Control
Voltage-mode PWM Control
Duty Cycle: 0% to 80%
Fast Transient Response
 10MHz High-bandwidth Error Amplifier with 6V/μs Slew Rate
 Fixed Oscillator Frequency: 300kHz/200kHz
 Lossless, Programmable Over Current Protection
(Uses Lower MOSFET R
DS(ON)
)
 Start-up into Pre-biased Load
 Built-in Thermal Shutdown
 Built-in Soft-start
 Over Current Protection
 Over Voltage Protection
 Under Voltage Protection
 Integrated Boot Diode
 Totally Lead-Free & Fully RoHS Compliant (Notes 1 & 2)
 Halogen and Antimony Free. “Green” Device (Note 3)
Pin Assignments
(Top View)
(SO-8/ M Package)
(Top View)
(SO-8EP/ MP Package)
Applications

Subsystem Power Supplies
PCI, AGP, Graphics Cards, Digital TV
SSTL-2 and DDR/2/3 SDRAM Bus Termination Supply
 Cable Modems, Set Top Boxes, and DSL Modems
 Industrial Power Supplies and General Purpose Supplies
Notes: 1. No purposely added lead. Fully EU Directive 2002/95/EC (RoHS) & 2011/65/EU (RoHS 2) compliant.
2. See http://www.diodes.com/quality/lead_free.html for more information about Diodes Incorporated’s definitions of Halogen- and Antimony-free, "Green"
and Lead-free.
3. Halogen- and Antimony-free "Green” products are defined as those which contain <900ppm bromine, <900ppm chlorine (<1500ppm total Br + Cl) and
<1000ppm antimony compounds.
1
2
3
4
8
7
6
5
BOOT
UGATE
GND
PHASE
COMP/EN
FB
VCC LGATE/OCSET
1
2
3
4
8
7
6
5
BOOT
UGATE
GND
LGATE/OCSET
PHASE
COMP/EN
FB
VCC
Exposed
Pad
9