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Diodes Semiconductor Electronic Components Datasheet

AP3581C Datasheet

Single Phase Synchronous Buck PWM Controller

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AP3581C pdf
OBSOLETE
Data Sheet
Single Phase Synchronous Buck PWM Controller
AP3581A/B/C
General Description
The1AP3581A/B/C1is1a1compact1synchronous-rect
ified buck controller specifically designed to operate
from 5V/12V supply and deliver high-quality output
voltage as low as 0.6V (AP3581A) or 0.8V
(AP3581B/C). The AP3581A/B/C operates at fixed
frequency of 300kHz (AP3581A/B) or 200kHz
(AP3581C) 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
solutions.
The AP3581A/B/C is available in PSOP-8 package.
Features
• Supply Voltage: 5V/12V
VIN Input Range: 3.0V to 13.2V
0.6V/0.8V to 80% of VIN Output Range
Internal Reference: 0.6V/0.8V
• 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 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, 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
Oct. 2011 Rev. 1. 0
PSOP-8
Figure 1. Package Type of AP3581A/B/C
BCD Semiconductor Manufacturing Limited
1


Diodes Semiconductor Electronic Components Datasheet

AP3581C Datasheet

Single Phase Synchronous Buck PWM Controller

No Preview Available !

AP3581C pdf
Single Phase Synchronous Buck PWM Controller
Pin Configuration
MP Package
(PSOP-8)
18
27
36
45
Data Sheet
AP3581A/B/C
Figure 2. Pin Configuration of AP3581A/B/C (Top View)
Pin Description
Pin Number
1
Pin Name
BOOT
2 UGATE
3 OPS
4 LGATE
5 VCC
6 FB
7 COMP/EN
8 PHASE
9 GND
Function
Bootstrap pin. Connect a bootstrap capacitor (Typically from
0.1µF 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 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. 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
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 has turned off
Exposed pad as ground pin. Represents the signal and power
ground for the IC. Tie this pin to the ground island/plane through
the lowest impedance connection available
Oct. 2011 Rev. 1. 0
BCD Semiconductor Manufacturing Limited
2


Part Number AP3581C
Description Single Phase Synchronous Buck PWM Controller
Maker BCD
Total Page 13 Pages
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