PART OBSOLETE – NO ALTERNATE PART
AP3581A/B/C
SINGLE PHASE SYNCHRONOUS BUCK PWM CONTROLLER
OBSOLETE – PART DISCONTINUED
Description
Pin Assignments
The1AP3581A/B/C1is1a1compact1synchronous – rectified bulk
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.
(Top View)
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.
BOOT
1
UGATE
2
OPS
3
LGATE
4
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.
8
PHASE
7
COMP/EN
6
FB
5
VCC
GND
9
PSOP-8
(Top View)
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.
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
The AP3581A/B/C is available in PSOP-8 package.
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
Supply Voltage: 5V/12V
5V/12V Input DC-DC Regulators
VIN Input Range: 3.0V to 13.2V
Low-Voltage Distributed Power Supplies
Features
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
AP3581A/B/C
Document number: DS41552 Rev. 2 - 4
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PART OBSOLETE – NO ALTERNATE PART
AP3581A/B/C
Typical Applications Circuit
C5 1mF
R4 2W
5
VCC
7
R3
10k
Disable
Enable
COMP/EN
C3
10nF
Q1
6
FB
AP3581A/B/C
OBSOLETE – PART DISCONTINUED
VIN=12V
BOOT
UGATE
C1
10μF/25V
1
C4
0.1mF
2
LGATE
OPS
8
R2
5.1k/10k
9
VOUT=1.2V
1.0μH
Q3
4
3
C6
1000μF/6.3V
GND
R1
10k
Q2
L1
PHASE
C2
220μF/25V
C7
1000μF/6.3V
R5
Pin Descriptions
Pin Number
Pin Name
1
BOOT
2
UGATE
3
OPS
4
LGATE
5
VCC
6
FB
7
COMP/EN
8
PHASE
9
GND
AP3581A/B/C
Document number: DS41552 Rev. 2 - 4
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
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PART OBSOLETE – NO ALTERNATE PART
AP3581A/B/C
Functional Block Diagram
VCC
OBSOLETE – PART DISCONTINUED
5
SOFT-START
OTP
POWER-ON RESET
(POR)
1
INTERNAL
REGULATOR
BOOT
3.3V INT
2
REFERENCE
&BIAS
OSCILLATOR
UGATE
0.6V
(AP3581A)
PWM
0.8V
(AP3581B/C)
6
FB
COMP/EN
PWM
COMPARATOR
ERROR
AMPLIFIER
7
GATE
CONTROL
LOGIC
8
PHASE
VCC
4
LGATE
ENABLE
3
0.3V
OPS
OVP
VREF
9
GND
AP3581A/B/C
Document number: DS41552 Rev. 2 - 4
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PART OBSOLETE – NO ALTERNATE PART
AP3581A/B/C
Absolute Maximum Ratings (Note 1)
OBSOLETE – PART DISCONTINUED
Symbol
Parameter
Value
Unit
VCC
Supply Voltage
-0.3 to 15
V
VBOOT
BOOT Voltage
-0.3 to VPHASE +15
V
VUGATE
Voltage from UGATE to PHASE
-0.3 to 15
V
VPHASE,
VLGATE
Voltage from PHASE, LGATE Pin to GND
-1 to 15
V
_
Voltage on Other Separate Pin
-0.3 to 6
V
θJA
Thermal Resistance
50
ºC/W
TJ
Operating Junction Temperature
-40 to +125
ºC
TSTG
Storage Temperature
-65 to +150
ºC
TLEAD
Lead Temperature (Soldering, 10 sec)
+260
ºC
_
ESD (Human Body Model) (Note 2)
2000
V
_
ESD (Machine Model) (Note 2)
200
V
Notes:
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.
2. Devices are ESD sensitive. Handling precaution recommended.
Recommended Operating Conditions
Symbol
Min
Max
Unit
Supply Input Voltage
4.5
13.2
V
TJ
Operating Junction Temperature Range
-40
+125
C
TA
Operating Ambient Temperature
-40
+85
C
VCC
Parameter
AP3581A/B/C
Document number: DS41552 Rev. 2 - 4
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PART OBSOLETE – NO ALTERNATE PART
AP3581A/B/C
Electrical Characteristics (VCC=12V, TA=+25℃, unless otherwise specified.)
Symbol
Parameter
Conditions
Min
Typ
Max
Unit
4.5
_
13.2
V
OBSOLETE – PART DISCONTINUED
SUPPLY INPUT
VCC
Supply Voltage
_
ICC
Supply Current
UGATE and LGATE Pin Open; VCC=12V,
Switching
_
5
_
mA
Quiescent Supply Current
VFB=VREF+0.1V,
No Switching
_
4
_
mA
Power Input Voltage
_
3.0
_
13.2
V
VCC Rising Threshold
VCC Rising
4.0
4.2
4.4
V
VCC Threshold Hysteresis
_
_
500
_
mV
AP3581A/B
270
300
330
AP3581C
180
200
220
VCC=12V
_
1.8
_
V
Open Loop DC Gain (Note
3)
_
55
70
_
dB
GBW
Gain Bandwidth (Note 3)
_
_
10
_
MHz
SR
Slew Rate (Note 3)
_
3
6
_
V/μs
_
Transconductance
_
_
800
1100
μA/V
_
Output Source Current
VFBVREF
80
120
_
μA
ICC_Q
VIN
POWER ON RESET
VPOR
VPOR_HYS
OSCILLATOR
fOSC
ΔVOSC
Oscillator Frequency
Ramp Amplitude
kHz
ERROR AMPLIFIER
GDC_OL
PWM CONTROLLER GATE DRIVERS
IUG_SRC
Upper Gate Source Current
VBOOT-VPHASE=12V, VBOOT-VUGATE=6V
_
-1
_
A
IUG_SNK
Upper Gate Sink Current
VBOOT-VPHASE=12V, VBOOT-VUGATE=6V
_
1.5
_
A
RUGATE
Upper Gate Sink Resistance
_
1.6
3.2
Ω
ILG_SRC
Lower Gate Source Current
VCC-VLGATE=6V
_
-1
_
A
ILG_SNK
Lower Gate Sink Current
VLGATE=6V
_
1.5
_
A
RLGATE
Lower Gate Sink Resistance
_
1
2
Ω
_
50
_
ns
_
Note:
PHASE Falling to LGATE
Rising Delay
50mA Sink Current,
VBOOT-VPHASE=12V
50mA Sink Current,
VCC=12V
VPHASE1.2V
3. Not tested, guaranteed by design.
AP3581A/B/C
Document number: DS41552 Rev. 2 - 4
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PART OBSOLETE – NO ALTERNATE PART
AP3581A/B/C
Electrical Characteristics (Cont.)
OBSOLETE – PART DISCONTINUED
Symbol
Parameter
Conditions
Min
Typ
Max
Unit
_
LGATE Falling to UGATE
Rising Delay
VLGATE1.2V
_
50
_
ns
_
Minimum Duty Cycle
_
_
0
_
%
_
Maximum Duty Cycle
_
75
80
85
%
AP3581A
0.591
0.6
0.609
V
AP3581B/C
0.788
0.8
0.812
V
REFERENCE VOLTAGE
VFB
Feedback Voltage
PROTECTION
VFB_UVP
IOPS
tSS
Under Voltage Protection
_
0.3
0.4
0.5
V
Over Current Source
_
30
40
50
μA
AP3581A
_
2.0
_
AP3581B
_
2.7
_
AP3581C
_
3.6
_
Soft-start Interval
ms
VCOMP/EN
Enable Threshold
_
0.25
0.30
0.35
V
TOTSD
Thermal Shutdown
_
_
+160
_
ºC
THYS
Thermal Shutdown
Hysteresis
_
_
+20
_
ºC
AP3581A/B/C
Document number: DS41552 Rev. 2 - 4
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PART OBSOLETE – NO ALTERNATE PART
AP3581A/B/C
Performance Characteristics
Line Regulation
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
-0.7
-0.5
4
5
6
7
8
9
10
11
12
13
0
14
2
4
6
Input Voltage (V)
360
350
350
340
340
330
330
Switching Frequency (kHz)
Switching Frequency (kHz)
10
12
14
16
18
20
Switching Frequency vs. Input Voltage
360
320
310
300
290
280
270
For AP3581A
260
8
Output Current (A)
Switching Frequency vs. Temperature
320
310
300
290
280
270
For AP3581A
260
250
250
240
-50
-25
0
25
50
75
100
125
150
240
4
o
Temperature ( C)
5
6
7
8
9
10
11
12
13
14
Input Voltage (V)
Feedback Voltage vs. Temperature
Feedback Voltage 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)
OBSOLETE – PART DISCONTINUED
Load Regulation
0.5
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
Temperature (C)
100
125
150
0.50
4
5
6
7
8
9
10
11
12
13
14
Input Voltage (V)
AP3581A/B/C
Document number: DS41552 Rev. 2 - 4
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PART OBSOLETE – NO ALTERNATE PART
AP3581A/B/C
Performance Characteristics (Cont.)
OBSOLETE – PART DISCONTINUED
Power-on Waveform
(VIN=12V, VOUT=1.2V, IOUT=0A)
Power-off Waveform
(VIN=12V, VOUT=1.2V, IOUT=20A)
VIN
10V/div
VIN
10V/div
VOUT
0.5V/div
VOUT
0.5V/div
VPHASE
10V/div
VCOMP
0.5V/div
IL
10A/divv
VLGATE
10V/div
Time 1ms/div
Time 200ms/div
Enable Waveform
(VIN=12V, VOUT=1.2V, IOUT=0A)
Disable Waveform
(VIN=12V, VOUT=1.2V, IOUT=20A)
VIN
10V/div
VPHASE
10V/div
VOUT
0.5V/div
VOUT
0.5V/div
VCOMP
0.5V/div
VCOMP
0.5V/div
IL
10A/div
IL
10A/div
Time 1ms/div
Time 20ms/div
Load Transient Response
(VIN=12V, VOUT=1.2V, IOUT=0A to 10A)
Load Transient Response
(VIN=12V, VOUT=1.2V, IOUT=0A to 20A)
VPHASE
5V/div
VPHASE
5V/div
VOUT_AC
200mV/div
VOUT_AC
200mV/div
IOUT
5A/div
IOUT
10A/div
Time 10ms/div
AP3581A/B/C
Document number: DS41552 Rev. 2 - 4
Time 10ms/div
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PART OBSOLETE – NO ALTERNATE PART
AP3581A/B/C
Performance Characteristics (Cont.)
OBSOLETE – PART DISCONTINUED
UGATE Turn Off Waveforms
(VCC=VIN=12V, VOUT=1.2V, IOUT=20A)
UGATE Turn On Waveforms
(VCC=VIN=12V, VOUT=1.2V, IOUT=20A)
VUGATE-PHASE
2V/div
VPHASE
2V/div
VUGATE-PHASE
2V/div
VLGATE
2V/div
VLGATE
2V/div
VPHASE
2V/div
Time 40ns/div
Time 40ns/div
Over Current Protection
(VIN=12V, VOUT=1.2V to 0V, IOUT=0A)
Over Voltage Protection
(VIN=12V, VOUT=1.2V, IOUT=20A)
VOUT
1V/div
VFB
1V/div
VCOMP
0.5V/div
VLGATE
10V/div
VPHASE
10V/div
VUGATE
20V/div
IL
10A/div
IL
10A/div
Time 10ms/div
AP3581A/B/C
Document number: DS41552 Rev. 2 - 4
Time 80ms/div
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PART OBSOLETE – NO ALTERNATE PART
AP3581A/B/C
Ordering Information
OBSOLETE – PART DISCONTINUED
AP3581 XX XX - XX
Product Name
A : AP3581A
B : AP3581B
C : AP3581C
Package
PSOP-8
Temperature
Range
Package
MP : PSOP-8
Packing
RoHS/Green
Blank : Tube
TR : Tape & Reel
G1:RoHS Compliant
and Green
Part Number
Marking ID
Packing Type
AP3581AMP-G1
3581AMP-G1
Tube
AP3581AMPTR-G1
3581AMP-G1
Tape and Reel
AP3581BMP-G1
3581BMP-G1
Tube
AP3581BMPTR-G1
3581BMP-G1
Tape and Reel
AP3581CMP-G1
3581CMP-G1
Tube
AP3581CMPTR-G1
3581CMP-G1
Tape and Reel
-40 to +85°C
AP3581A/B/C
Document number: DS41552 Rev. 2 - 4
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PART OBSOLETE – NO ALTERNATE PART
AP3581A/B/C
Package Outline Dimensions (All dimensions in mm(inch).)
(1)
Package Type: PSOP-8
OBSOLETE – PART DISCONTINUED
3.800(0.150)
4.000(0.157)
2.313(0.091)
3.202(0.126)
3.402(0.134)
2.513(0.099)
1.270(0.050)
TYP
4.700(0.185)
5.100(0.201)
0.330(0.013)
0.510(0.020)
5.800(0.228)
6.200(0.244)
0.050(0.002)
0.150(0.006)
1.350(0.053)
1.550(0.061)
1.350(0.053)
0°
8°
1.750(0.069)
0.400(0.016)
1.270(0.050)
0.170(0.007)
0.250(0.010)
Note: Eject hole, oriented hole and mold mark is optional.
AP3581A/B/C
Document number: DS41552 Rev. 2 - 4
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PART OBSOLETE – NO ALTERNATE PART
AP3581A/B/C
Suggested Pad Layout
Package Type: PSOP-8
OBSOLETE – PART DISCONTINUED
(1)
Y1
G
Z
X1
Y
E
Dimensions
Value
Dimensions
Value
Z
(mm)/(inch)
6.900/0.272
X1
(mm)/(inch)
3.600/0.142
AP3581A/B/C
Document number: DS41552 Rev. 2 - 4
X
G
(mm)/(inch)
3.900/0.154
Y1
(mm)/(inch)
2.700/0.106
X
(mm)/(inch)
0.650/0.026
E
(mm)/(inch)
1.270/0.050
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Y
(mm)/(inch)
1.500/0.059
-----
November 2018
© Diodes Incorporated
PART OBSOLETE – NO ALTERNATE PART
AP3581A/B/C
IMPORTANT NOTICE
OBSOLETE – PART DISCONTINUED
DIODES INCORPORATED MAKES NO WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, WITH REGARDS TO THIS DOCUMENT,
INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
(AND THEIR EQUIVALENTS UNDER THE LAWS OF ANY JURISDICTION).
Diodes Incorporated and its subsidiaries reserve the right to make modifications, enhancements, improvements, corrections or other changes
without further notice to this document and any product described herein. Diodes Incorporated does not assume any liability arising out of the
application or use of this document or any product described herein; neither does Diodes Incorporated convey any license under its patent or
trademark rights, nor the rights of others. Any Customer or user of this document or products described herein in such applications shall assume
all risks of such use and will agree to hold Diodes Incorporated and all the companies whose products are represented on Diodes Incorporated
website, harmless against all damages.
Diodes Incorporated does not warrant or accept any liability whatsoever in respect of any products purchased through unauthorized sales channel.
Should Customers purchase or use Diodes Incorporated products for any unintended or unauthorized application, Customers shall indemnify and
hold Diodes Incorporated and its representatives harmless against all claims, damages, expenses, and attorney fees arising out of, directly or
indirectly, any claim of personal injury or death associated with such unintended or unauthorized application.
Products described herein may be covered by one or more United States, international or foreign patents pending. Product names and markings
noted herein may also be covered by one or more United States, international or foreign trademarks.
This document is written in English but may be translated into multiple languages for reference. Only the English version of this document is the
final and determinative format released by Diodes Incorporated.
LIFE SUPPORT
Diodes Incorporated products are specifically not authorized for use as critical components in life support devices or systems without the express
written approval of the Chief Executive Officer of Diodes Incorporated. As used herein:
A. Life support devices or systems are devices or systems which:
1. are intended to implant into the body, or
2. support or sustain life and whose failure to perform when properly used in accordance with instructions for use provided in the
labeling can be reasonably expected to result in significant injury to the user.
B. A critical component is any component in a life support device or system whose failure to perform can be reasonably expected to cause the
failure of the life support device or to affect its safety or effectiveness.
Customers represent that they have all necessary expertise in the safety and regulatory ramifications of their life support devices or systems, and
acknowledge and agree that they are solely responsible for all legal, regulatory and safety-related requirements concerning their products and any
use of Diodes Incorporated products in such safety-critical, life support devices or systems, notwithstanding any devices- or systems-related
information or support that may be provided by Diodes Incorporated. Further, Customers must fully indemnify Diodes Incorporated and its
representatives against any damages arising out of the use of Diodes Incorporated products in such safety-critical, life support devices or systems.
Copyright © 2018, Diodes Incorporated
www.diodes.com
AP3581A/B/C
Document number: DS41552 Rev. 2 - 4
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