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Diodes Semiconductor Electronic Components Datasheet

AP3583A Datasheet

Single Phase Synchronous Buck PWM Controller

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AP3583A pdf
Data Sheet
Single Phase Synchronous Buck PWM Controller With Reference Input AP3583/A
General Description
The AP3583/A is a simple single-phase synchronous
buck controller. It operates from 5V or 12V supply
voltage and delivers high quality output voltage as
low as 0.6V. This device operates at fixed 200kHz
(AP3583) or 300kHz (AP3583A) frequency and
provides an optimum compromise between efficiency,
external component size and cost.
With integrated linear regulator bootstrap diode, and
N-Channel MOSFET gate drives, the AP3583/A can
reduce external component count and board space
requirements.
The AP3583/A supports both tracking mode and
stand-alone mode operation. The output voltage is
tightly regulated to the external reference voltage
from 0.4V to 3V at tracking mode or internal 0.6V
reference at stand-alone mode.
Other features include internal soft-start, under
voltage protection, over current protection and
shutdown function. With aforementioned functions,
this part provides customers a compact, high
efficiency, well-protected and cost-effective
solutions.
The AP3583/A is available in PSOP-8 package.
Features
• Supply Voltage: 5V/12V
VIN Input Range: 3.0V to 13.2V
0.6V to 80% of VIN Output Range
Internal Reference: 0.6V
• Support Tracking Mode and Stand-alone Mode
• Simple Single-loop Control
Voltage-mode PWM Control
Duty Cycle: 0% to 80%
Fast Transient Response
• Fixed Oscillator Frequency: 200/300kHz
• Lossless, Programmable Over Current Protection
(Uses Lower MOSFET RDS(ON) )
• Start-up into Pre-biased Output
• Built-in Thermal Shutdown
• Built-in Soft-start
• Over Current/Voltage Protection
• Under Voltage Protection
• Integrated Boot Diode
Applications
Power Supplies for Microprocessors/Peripherals
PCs, Embedded Controllers, Memory Supplies
DSP and Core Communications Processor
Supplies
Subsystem Power Supplies
PCI, AGP, Graphics Cards and 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
5V/12V Input DC-DC Regulators
Low-voltage Distributed Power Supplies
Dec. 2011 Rev. 1. 1
PSOP-8
Figure 1. Package Type of AP3583/A
BCD Semiconductor Manufacturing Limited
1


Diodes Semiconductor Electronic Components Datasheet

AP3583A Datasheet

Single Phase Synchronous Buck PWM Controller

No Preview Available !

AP3583A pdf
Data Sheet
Single Phase Synchronous Buck PWM Controller With Reference Input AP3583/A
Pin Configuration
MP Package
(PSOP-8)
18
27
36
45
Figure 2. Pin Configuration of AP3583/A (Top View)
Pin Description
Pin Number
1
2
3
4
5
6
7
8
9
Pin Name
BOOT
UGATE
OPS
LGATE
VCC
FB
REFIN
PHASE
GND
Function
Bootstrap pin. Connect a bootstrap capacitor (Typically from 0.1
to 0.47µF) from this pin to PHASE pin to create 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 been turned off
Over-current setting pin. Connecting a resistor (ROCSET) between
OPS and GND to set the over-current trigger point
Lower-gate drive pin. Connect LGATE to the lower MOSFET
gate providing the gate drive for the lower MOSFET. This pin is
monitored by the adaptive shoot-through protection circuitry to
determine when the lower MOSFET has been turned off
Bias supply pin. Provides a 5V or 12V 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. A resistor divider from output to GND is used to set the
output voltage
External reference input pin. This pin receives a voltage with
range from 0.4V to 3.0V as the reference voltage at the
non-inverting input of the error amplifier. Pull this pin lower than
0.3V to disable the controller, and the VUGATE and VLGATE will go
low. Let this pin open for internal 0.6V reference use
PHASE pin. 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 is turned off
Exposed pad as ground pin. Represents the signal and power
ground for the IC. Tie this pin to ground island/plane through the
lowest impedance connection available
Dec. 2011 Rev. 1. 1
BCD Semiconductor Manufacturing Limited
2


Part Number AP3583A
Description Single Phase Synchronous Buck PWM Controller
Maker BCD
Total Page 13 Pages
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