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Diodes Semiconductor Electronic Components Datasheet

AP3585A Datasheet

SINGLE PHASE SYNCHRONOUS BUCK PWM CONTROLLER

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AP3585A pdf
A Product Line of
Diodes Incorporated
AP3585A/B/C
SINGLE PHASE SYNCHRONOUS BUCK PWM CONTROLLER
Description
Pin Assignments
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
VIN Input Range: 3.3V to 12V
0.8V/0.6V to 80% of VIN 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 RDS(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)
(Top View)
BOOT 1
UGATE 2
GND 3
LGATE/OCSET 4
8 PHASE
7 COMP/EN
6 FB
5 VCC
(SO-8/ M Package)
(Top View)
BOOT 1
UGATE 2
GND 3
LGATE/OCSET 4
Exposed
Pad
9
8 PHASE
7 COMP/EN
6 FB
5 VCC
(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.
AP3585A/B/C
Document number: DS36819 Rev. 1 - 2
1 of 18
www.diodes.com
January 2014
© Diodes Incorporated


Diodes Semiconductor Electronic Components Datasheet

AP3585A Datasheet

SINGLE PHASE SYNCHRONOUS BUCK PWM CONTROLLER

No Preview Available !

AP3585A pdf
Typical Applications Circuit
A Product Line of
Diodes Incorporated
AP3585A/B/C
Pin Descriptions
Pin Number
SO-8
SO-8EP
11
22
33
44
55
66
77
88
–9
Pin Name
BOOT
UGATE
GND
LGATE/OCSET
VCC
FB
COMP/EN
PHASE
Exposed Pad
Function
Bootstrap pin. Connect a bootstrap capacitor from this pin to PHASE for
creating a BOOT voltage suitable to drive a standard N-Channel
MOSFET.
Upper-gate drive pin. Connect this pin to the upper MOSFET gate
providing the gate drive. This pin is monitored by the adaptive shoot-
through protection circuitry to determine when the upper MOSFET has
turned off.
Ground for the IC. All voltage levels are measured with respect to this pin.
Connect this pin directly to the low side MOSFET source and ground
plane with the lowest impedance. The exposed pad must be soldered to a
large PCB and connected to GND for maximum power dissipation.
Low-side Gate Driver Output and Over-Current Setting Input. This pin is
the gate driver for low-side MOSFET. It is also used to set the maximum
inductor current. Refer to the section in “Function Description” for detail.
Bias supply pin. Provides a 4.5V to 13.2V bias supply for the chip from this
pin. The pin should be bypassed with a capacitor to GND.
Feedback pin. This pin is the inverting input of the internal error amplifier.
Use FB pin, in combination with the COMP pin, to compensate the voltage
control feedback loop of the converter. A resistor divider from output to
GND is used to set the output voltage.
Compensation and disable pin. This pin is the output of the Error Amplifier.
Pull COMP pin low will shut down the IC.
This pin connects to the source of the upper MOSFET and the drain of the
lower MOSFET. This pin is also monitored by the adaptive shoot-through
protection circuitry to determine when the upper MOSFET has turned off.
Exposed Pad as ground pin.
AP3585A/B/C
Document number: DS36819 Rev. 1 - 2
2 of 18
www.diodes.com
January 2014
© Diodes Incorporated


Part Number AP3585A
Description SINGLE PHASE SYNCHRONOUS BUCK PWM CONTROLLER
Maker Diodes Incorporated
Total Page 18 Pages
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