OBSOLETE
Data Sheet
Single Phase Synchronous Buck PWM Controller
General Description
Features
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.
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This controller integrates internal MOSFET drivers
that support 12V+12V bootstrapped voltage for highefficiency power conversion. The bootstrap diode is
built-in to simplify the circuit design and minimize
external part count.
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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.
AP3581A/B/C
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
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.
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The AP3581A/B/C is available in PSOP-8 package.
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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
PSOP-8
Figure 1. Package Type of AP3581A/B/C
Oct. 2011
Rev. 1. 0
BCD Semiconductor Manufacturing Limited
1
Data Sheet
Single Phase Synchronous Buck PWM Controller
AP3581A/B/C
Pin Configuration
MP Package
(PSOP-8)
1
8
2
7
3
6
4
5
Figure 2. Pin Configuration of AP3581A/B/C (Top View)
Pin Description
Pin Number
Oct. 2011
Pin Name
1
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
Rev. 1. 0
BCD Semiconductor Manufacturing Limited
2
Data Sheet
Single Phase Synchronous Buck PWM Controller
AP3581A/B/C
Functional Block Diagram
Figure 3. Functional Block Diagram of AP3581A/B/C
Ordering Information
AP3581 A
Package
PSOP-8
Circuit Type
A:AP3581A
B:AP3581B
C:AP3581C
Package
MP: PSOP-8
Temperature
Range
-40 to 85°C
A
G1: Green
Blank: Tube
TR: Tape & Reel
Part Number
Marking ID
Packing Type
AP3581AMP-G1
3581AMP-G1
Tube
AP3581AMPTR-G1
3581AMP-G1
Tape & Reel
AP3581BMP-G1
3581BMP-G1
Tube
AP3581BMPTR-G1
3581BMP-G1
Tape & Reel
AP3581CMP-G1
3581CMP-G1
Tube
AP3581CMPTR-G1
3581CMP-G1
Tape & Reel
BCD Semiconductor's Pb-free products, as designated with "G1" suffix in the part number, are RoHS compliant
and green.
Oct. 2011
Rev. 1. 0
BCD Semiconductor Manufacturing Limited
3
Data Sheet
Single Phase Synchronous Buck PWM Controller
AP3581A/B/C
Absolute Maximum Ratings (Note 1)
Parameter
Symbol
Value
Unit
Supply Voltage
VCC
-0.3 to 15
V
BOOT Voltage
VBOOT
-0.3 to VPHASE +15
V
Voltage from UGATE to PHASE
VUGATE
-0.3 to 15
V
Voltage from PHASE, LGATE Pin to GND
VPHASE,
VLGATE
-1 to 15
V
-0.3 to 6
V
Voltage on Other Separate Pin
Thermal Resistance
θJA
50
ºC/W
Operating Junction Temperature
TJ
-40 to 125
ºC
Storage Temperature
TSTG
-65 to 150
ºC
Lead Temperature (Soldering, 10 sec)
TLEAD
260
ºC
ESD (Human Body Model) (Note 2)
2000
V
ESD (Machine Model) (Note 2)
200
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 recommended.
Recommended Operating Conditions
Parameter
Symbol
Min
Max
Unit
VCC
4.5
13.2
V
Operating Junction Temperature Range
TJ
-40
125
°C
Operating Ambient Temperature
TA
-40
85
°C
Supply Input Voltage
Oct. 2011
Rev. 1. 0
BCD Semiconductor Manufacturing Limited
4
Data Sheet
Single Phase Synchronous Buck PWM Controller
AP3581A/B/C
Electrical Characteristics
VCC=12V, TA=25°C, unless otherwise specified.
Parameter
Symbol
Conditions
Min
Typ
Max
Unit
13.2
V
SUPPLY INPUT
Supply Voltage
VCC
Supply Current
ICC
Quiescent Supply Current
Power Input Voltage
ICC_Q
4.5
UGATE and LGATE
Pin Open; VCC=12V,
Switching
VFB=VREF+0.1V,
No Switching
VIN
5
mA
4
mA
3.0
13.2
V
4.4
V
POWER ON RESET
VCC Rising Threshold
VCC Threshold Hysteresis
VPOR
VCC Rising
4.0
VPOR_HYS
4.2
500
mV
OSCILLATOR
Oscillator Frequency
Ramp Amplitude
fOSC
∆VOSC
AP3581A/B
270
300
330
AP3581C
180
200
220
VCC=12V
kHz
1.8
V
70
dB
10
MHz
6
V/µs
ERROR AMPLIFIER
Open Loop DC Gain (Note 3)
GDC_OL
Gain Bandwidth (Note 3)
GBW
Slew Rate (Note 3)
SR
55
3
Transconductance
800
1100
µA/V
Output Source Current
VFBVREF
80
120
µA
-1
A
1.5
A
PWM CONTROLLER GATE DRIVERS
Upper Gate Source Current
IUG_SRC
Upper Gate Sink Current
IUG_SNK
Upper Gate Sink Resistance
RUGATE
Lower Gate Source Current
ILG_SRC
Lower Gate Sink Current
ILG_SNK
Lower Gate Sink Resistance
PHASE Falling to LGATE Rising
Delay
Oct. 2011
RLGATE
VBOOT-VPHASE=12V,
VBOOT-VUGATE=6V
VBOOT-VPHASE=12V,
VBOOT-VUGATE=6V
50mA Sink Current,
VBOOT-VPHASE=12V
1.6
3.2
Ω
VCC-VLGATE=6V
-1
A
VLGATE=6V
1.5
A
50mA Sink Current,
VCC=12V
VPHASE1.2V
Rev. 1. 0
1
50
2
Ω
ns
BCD Semiconductor Manufacturing Limited
5
Data Sheet
Single Phase Synchronous Buck PWM Controller
AP3581A/B/C
Electrical Characteristics (Continued)
VCC=12V, TA=25ºC, unless otherwise specified.
Parameter
Symbol
Conditions
LGATE Falling to UGATE Rising
Delay
Min
Typ
VLGATE1.2V
Minimum Duty Cycle
Maximum Duty Cycle
Max
Unit
50
ns
0
%
75
80
85
%
AP3581A
0.591
0.6
0.609
V
AP3581B/C
0.788
0.8
0.812
V
0.3
0.4
0.5
V
40
50
µA
REFERENCE VOLTAGE
Feedback Voltage
VFB
PROTECTION
Under Voltage Protection
VFB_UVP
Over Current Source
IOPS
Soft-start Interval
30
tSS
Enable Threshold
AP3581A
2.0
AP3581B
2.7
AP3581C
3.6
VCOMP/EN
0.25
ms
0.30
0.35
V
Thermal Shutdown
TOTSD
160
ºC
Thermal Shutdown Hysteresis
THYS
20
ºC
Note 3: Not tested, guaranteed by design.
Typical Performance Characteristics
0.5
0.2
0.4
0.1
VOUT=1.2V, IOUT=5A
Output Voltage Variation (%)
Output Voltage Variation (%)
0.3
0.2
0.1
0.0
-0.1
-0.2
-0.3
VIN=12V,VOUT=1.2V
0.0
-0.1
-0.2
-0.3
-0.4
-0.5
-0.6
-0.4
-0.5
-0.7
4
5
6
7
8
9
10
11
12
13
14
0
Input Voltage (V)
4
6
8
10
12
14
16
18
20
Output Current (A)
Figure 4. Line Regulation
Oct. 2011
2
Figure 5. Load Regulation
Rev. 1. 0
BCD Semiconductor Manufacturing Limited
6
Data Sheet
Single Phase Synchronous Buck PWM Controller
AP3581A/B/C
Typical Performance Characteristics (Continued)
360
360
350
350
340
330
Switching Frequency (kHz)
Switching Frequency (kHz)
340
320
310
300
290
280
270
For AP3581A
260
330
320
310
300
290
280
270
For AP3581A
260
250
250
240
-50
-25
0
25
50
75
100
125
240
150
4
5
6
7
8
9
10
11
12
13
14
o
Temperature ( C)
Input Voltage (V)
Figure 7. Switching Frequency vs. Input Voltage
0.70
0.70
0.68
0.68
0.66
0.66
0.64
0.64
Feedback Voltage (V)
Feedback Voltage (V)
Figure 6. Switching Frequency vs. Temperature
0.62
0.60
0.58
0.56
0.54
For AP3581A
0.62
0.60
0.58
0.56
For AP3581A
0.54
0.52
0.52
0.50
-50
-25
0
25
50
75
100
125
150
0.50
Temperature (°C)
4
5
6
7
8
9
10
11
12
13
14
Input Voltage (V)
Figure 8. Feedback Voltage vs. Temperature
Oct. 2011
Figure 9. Feedback Voltage vs. Input Voltage
Rev. 1. 0
BCD Semiconductor Manufacturing Limited
7
Data Sheet
Single Phase Synchronous Buck PWM Controller
AP3581A/B/C
Typical Performance Characteristics (Continued)
VIN
10V/div
VOUT
0.5V/div
VPHASE
10V/div
IL
10A/div
VIN
10V/div
VOUT
0.5V/div
VCOMP
0.5V/div
VLGATE
10V/div
Time 200µs/div
Time 1ms/div
Figure 10. Power-on Waveform
(VIN=12V, VOUT=1.2V, IOUT=0A)
Figure 11. Power-off Waveform
(VIN=12V, VOUT=1.2V, IOUT=20A)
VIN
10V/div
VPHASE
10V/div
VOUT
0.5V/div
VCOMP
0.5V/div
IL
10A/div
VOUT
0.5V/div
VCOMP
0.5V/div
IL
10A/div
Time 20µs/div
Time 1ms/div
Figure 13. Disable Waveform
(VIN=12V, VOUT=1.2V, IOUT=20A)
Figure 12. Enable Waveform
(VIN=12V, VOUT=1.2V, IOUT=0A)
Oct. 2011
Rev. 1. 0
BCD Semiconductor Manufacturing Limited
8
Data Sheet
Single Phase Synchronous Buck PWM Controller
AP3581A/B/C
Typical Performance Characteristics (Continued)
VPHASE
5V/div
VPHASE
5V/div
VOUT_AC
200mV/div
VOUT_AC
200mV/div
IOUT
10A/div
IOUT
5A/div
Time 10µs/div
Time 10µs/div
Figure 14. Load Transient Response
(VIN=12V, VOUT=1.2V, IOUT=0A to 10A)
Figure 15. Load Transient Response
(VIN=12V, VOUT=1.2V, IOUT=0A to 20A)
VUGATE-PHASE
2V/div
VUGATE-PHASE
2V/div
VLGATE
2V/div
VPHASE
2V/div
VLGATE
2V/div
VPHASE
2V/div
Time 40ns/div
Time 40ns/div
Figure 16. UGATE Turn Off Waveforms
(VCC=VIN=12V, VOUT=1.2V, IOUT=20A)
Oct. 2011
Figure 17. UGATE Turn On Waveforms
(VCC=VIN=12V, VOUT=1.2V, IOUT=20A)
Rev. 1. 0
BCD Semiconductor Manufacturing Limited
9
Data Sheet
Single Phase Synchronous Buck PWM Controller
AP3581A/B/C
Typical Performance Characteristics (Continued)
VOUT
1V/div
VCOMP
0.5V/div
VFB
1V/div
VLGATE
10V/div
VUGATE
20V/div
IL
10A/div
VPHASE
10V/div
IL
10A/div
Time 80µs/div
Time 10ms/div
Figure 18. Over Current Protection
(VIN=12V, VOUT=1.2V to 0V, IOUT=0A)
Oct. 2011
Figure 19. Over Voltage Protection
(VIN=12V, VOUT=1.2V, IOUT=20A)
Rev. 1. 0
BCD Semiconductor Manufacturing Limited
10
Data Sheet
Single Phase Synchronous Buck PWM Controller
AP3581A/B/C
Typical Application
Figure 20. Typical Application Circuit of AP3581A/B/C
Oct. 2011
Rev. 1. 0
BCD Semiconductor Manufacturing Limited
11
Data Sheet
Single Phase Synchronous Buck PWM Controller
AP3581A/B/C
Mechanical Dimensions
Unit: mm(inch)
3.202(0.126)
3.402(0.134)
PSOP-8
Oct. 2011
Rev. 1. 0
BCD Semiconductor Manufacturing Limited
12
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