Data sheet
Single Phase Synchronous Buck PWM Controller
General Description
The AP3586A/B/C is a compact synchronous
-rectified buck controller specifically designed to
operate from 5V or 12V supply voltage and deliver
high-quality output voltage as low as 0.6V
(AP3586A) or 0.8V (AP3586B/C). This device
operates at fixed 300kHz (AP3586A/B) or 200kHz
(AP3586C) 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
solutions.
The AP3586A/B/C is available in SOIC-8 and
PSOP-8 packages.
AP3586A/B/C
Features
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Supply Voltage: 5V/12V
V
IN
Input Range: 3.3V to 12V
0.6V/0.8V to 82% of V
IN
Output Range
Internal Reference: 0.6V/0.8V
Simple Single-loop Control
Voltage-mode PWM Control
Duty Cycle: 0% to 82%
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
Applications
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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
SOIC-8/PSOP-8
Figure 1. Package Types of AP3586A/B/C
Mar. 2012
Rev. 1. 1
1
BCD Semiconductor Manufacturing Limited
Data sheet
Single Phase Synchronous Buck PWM Controller
Pin Configuration
M Package
(SOIC-8)
1
2
3
4
8
7
6
5
1
2
3
4
AP3586A/B/C
MP Package
(PSOP-8)
8
7
6
5
Figure 2. Pin Configuration of AP3586A/B/C (Top View)
Pin Description
Pin Number
SOIC-8
PSOP-8
1
1
Pin Name
BOOT
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 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.
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.
2
2
UGATE
3
3
GND
4
4
LGATE/OCSET
5
5
VCC
6
6
FB
7
8
7
8
COMP/EN
PHASE
9
Exposed Pad
Mar. 2012
Rev. 1. 1
2
BCD Semiconductor Manufacturing Limited
Data sheet
Single Phase Synchronous Buck PWM Controller
Functional Block Diagram
AP3586A/B/C
5
1
2
8
4
/OCSET
/0.6V
6
7
3
/EN
Figure 3. Functional Block Diagram of AP3586A/B/C
Mar. 2012
Rev. 1. 1
3
BCD Semiconductor Manufacturing Limited
Data sheet
Single Phase Synchronous Buck PWM Controller
Ordering Information
AP3586
Circuit Type
A: AP3586A
B: AP3586B
C: AP3586C
Package
M: SOIC-8
MP: PSOP-8
Temperature
Range
AP3586A/B/C
-
G1: Green
Blank: Tube
TR: Tape & Reel
Package
Part Number
AP3586AM-G1
AP3586AMTR-G1
Marking ID
3586AM-G1
3586AM-G1
3586BM-G1
3586BM-G1
3586CM-G1
3586CM-G1
3586AMP-G1
3586AMP-G1
3586BMP-G1
3586BMP-G1
3586CMP-G1
3586CMP-G1
Packing Type
Tube
Tape & Reel
Tube
Tape & Reel
Tube
Tape & Reel
Tube
Tape & Reel
Tube
Tape & Reel
Tube
Tape & Reel
SOIC-8
AP3586BM-G1
AP3586BMTR-G1
AP3586CM-G1
-40 to 85°C
AP3586CMTR-G1
AP3586AMP-G1
AP3586AMPTR-G1
PSOP-8
AP3586BMP-G1
AP3586BMPTR-G1
AP3586CMP-G1
AP3586CMPTR-G1
BCD Semiconductor's Pb-free products, as designated with "G1" suffix in the part number, are RoHS compliant
and green.
Mar. 2012
Rev. 1. 1
4
BCD Semiconductor Manufacturing Limited
Data sheet
Single Phase Synchronous Buck PWM Controller
Absolute Maximum Ratings (Note 1)
Parameter
Supply Input Voltage
BOOT Voltage
UGATE to PHASE Voltage
PHASE, LGATE to GND Voltage
Other Pin Voltage
Power Dissipation
Thermal Resistance
Operating Junction Temperature
Storage Temperature
Lead Temperature (Soldering, 10 sec)
ESD (Human Body Model) (Note 2)
ESD (Machine Model) (Note 2)
P
D
θ
JA
T
J
T
STG
T
LEAD
AP3586A/B/C
Symbol
V
CC
V
BOOT
V
UGATE
V
PHASE
,
V
LGATE
Value
-0.3 to 15
-0.3 to V
PHASE
+15
-0.3 to 15
-1 to 15
-0.3 to 6
TBD
50
-40 to 125
-65 to 150
260
2000
200
Unit
V
V
V
V
V
mW
ºC/W
ºC
ºC
ºC
V
V
Note 1: Stresses greater than those listed under “Absolute Maximum Ratings” may cause permanent damage to
the device. These are stress ratings only, and functional operation of the device at these or any other conditions
beyond those indicated under “Recommended Operating Conditions” is not implied. Exposure to “Absolute
Maximum Ratings” for extended periods may affect device reliability.
Note 2: Devices are ESD sensitive. Handling precaution is recommended.
Recommended Operating Conditions
Parameter
Supply Input Voltage
Operating Ambient Temperature
Symbol
V
CC
T
A
Min
5
-40
Max
12
85
Unit
V
°C
Mar. 2012
Rev. 1. 1
5
BCD Semiconductor Manufacturing Limited
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