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AP1509
150KHz, 2A PWM BUCK DC/DC CONVERTER
Description
The AP1509 series are monolithic IC designed for a stepdown DC/DC converter, and own the ability of driving a 2A load without additional transistor. It saves board space. The external shutdown function can be controlled by logic level and then come into standby mode. The internal compensation makes feedback control having good line and load regulation without external design. Regarding protected function, thermal shutdown is to prevent over temperature operating from damage, and current limit is against over current operating of the output switch. If current limit function occurs and VFB is down below 0.5V, the switching frequency will be reduced. The AP1509 series operates at a switching frequency of 150KHz thus allow smaller sized filter
Pin Assignments
(Top View)
VIN
Output FB SD
1 2 AP1509 3 4 SOP-8L
8 7 6 5
GND GND GND GND
components than what would be needed with lower frequency switching regulators. Other features include a guaranteed +4% tolerance on output voltage under specified input voltage and output load conditions, and +15% on the oscillator frequency. The output version included fixed 3.3V, 5V, 12V, and an adjustable type. The chips are available in a standard 8-lead SOP-8 package.
Features
* * * * * * * * * * * * * Output Voltage: 3.3V, 5V, 12V and Adjustable Output Version Adjustable Version Output Voltage Range, 1.23V to 18V+4% 150KHz +15% Fixed Switching Frequency Voltage Mode Non-Synchronous PWM Control Thermal-Shutdown and Current-Limit Protection ON/OFF Shutdown Control Input Operating Voltage can be up to 22V Output Load Current: 2A SOP-8L Packages Low Power Standby Mode Built-in Switching Transistor On Chip SOP-8L: Available in "Green" Molding Compound (No Br, Sb) Lead Free Finish/ RoHS Compliant (Note 1)
Applications
* * * Simple High-Efficiency Step-Down Regulator On-Card Switching Regulators Positive to Negative Converter
Notes:
1. EU Directive 2002/95/EC (RoHS). All applicable RoHS exemptions applied. Please visit our website at http://www.diodes.com/products/lead_free.html.
AP1509
Document number: DS31016 Rev. 4 - 2
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AP1509
150KHz, 2A PWM BUCK DC/DC CONVERTER Typical Application Circuit
(1) Fixed Type Circuit
FB 12V DC Input 1 VIN 4 CIN Capacitor
SD
3
AP150933
5 6 7
Output 2
L1 47uH Inductor
3.3V/2A Output Load
8 D1 Schottky Diode Co Capacitor
GND GND GND GND
(2) Adjustable Type Circuit R2 1K
12V DC Input VIN CIN Capacitor 1 4
SD
R1 1K FB 3 L1 39uH Inductor D1 Schottky Diode Co Capacitor 2.5V/2A Output Load
AP1509
5 6 7
2 8
Output
GND GND GND GND
VOUT = VFB x (1 +
R1 R2
)
VFB = 1.23V R2 = 1K ~ 3K
(3) Delay Start Circuit
R2 1K 12V DC Input FB 3 VIN CDELAY 0.1uF CIN Capacitor RDELAY 10K 1 4
SD
R1 1K L1 39uH Inductor D1 Schottky Diode Co Capacitor 2.5V/2A Output Load
AP1509
5 6 7
2 8
Output
GND GND GND GND
AP1509
Document number: DS31016 Rev. 4 - 2
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AP1509
150KHz, 2A PWM BUCK DC/DC CONVERTER Pin Descriptions
Pin Name
VIN Output GND FB SD
Description
Operating voltage input Switching output Ground Output voltage feedback control ON/OFF Shutdown
Functional Block Diagram
SD
VIN
200mV Current Source bias 1.235V Reference 2.5V Regulator Start up 220mV
+ Comp _
Comp +
FB
Comp +
AP1509
Document number: DS31016 Rev. 4 - 2
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_
+ Amp _
Frequecy compensation
Predriver
150kH z OSC.
Thermal Shutdown
_
2A Switch
Output GND
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AP1509
150KHz, 2A PWM BUCK DC/DC CONVERTER Absolute Maximum Ratings
Symbol
ESD HBM ESD MM VIN VSD VFB VOUT PD TST TJ
Parameter
Human Body Model ESD Protection Machine Model ESD Protection Supply Voltage ON/OFF Pin Input Voltage Feedback Pin Voltage Output Voltage to Ground Power Dissipation Storage Temperature Operating Junction Temperature
Rating
2 200 +24 -0.3 to +18 -0.3 to +18 -1 Internally Limited -65 to +150 -40 to +125
Unit
KV V V V V V W
o o
C C
Recommended Operating Conditions
Symbol IOUT VOP TA Parameter Output Current Operating Voltage Operating Ambient Temperature Min 0 4.5 -20 Max 2 22 85 Unit A V o C
AP1509
Document number: DS31016 Rev. 4 - 2
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AP1509
150KHz, 2A PWM BUCK DC/DC CONVERTER Electrical Characteristics
Unless otherwise specified, VIN = 12V for 3.3V, 5V, adjustable version and VIN = 18V for the 12V version. ILOAD = 0.5A Specifications with boldface type are for full operating temperature range, the other type are for TJ = 25C.
Symbol
IFB FOSC FSCP VSAT DC ICL
Parameter
Feedback Bias Current Oscillator Frequency Oscillator Frequency of Short Circuit Protect Saturation Voltage Max. Duty Cycle (ON) Min. Duty Cycle (OFF) Current Limit Output Leakage Output = -1 Current Quiescent Current Standby Quiescent Current Output = 0 ON/OFF Pin Logic Input Threshold Voltage
Conditions VFB = 1.3V (Adjustable version only)
Min
Typ.
-10
127 110 When current limit occurred and VFB < 0.5V, Ta = 25 oC IOUT = 2A No outside circuit VFB = 0V force driver on VFB = 0V force driver on VFB = 12V force driver off Peak current No outside circuit VFB = 0V force driver on No outside circuit VFB = 12V force driver off VIN = 22V VFB = 12V force driver off ON/OFF pin = 5V VIN = 22V Low (regulator ON) High (regulator OFF) 10
150 30 1.25 100 0
Max -50 -100 173 173
50 1.4
Unit
nA KHz KHz V % A
1.5
3 -200 -5 5 70 2.0 1.3 10 150 200 0.6 -0.01 -0.1 15 70 -1
o
IL IQ ISTBY VIL VIH IH IL JA JC
uA mA mA uA V
ON/OFF Pin Logic Input VLOGIC = 2.5V (OFF) Current ON/OFF Pin Input Current VLOGIC = 0.5V (ON) Junction to Thermal Resistance SOP-8L case Thermal Resistance Junction to SOP-8L with a copper area of ambient 2 approximately 3 in
uA C/W C/W
o
AP1509
Document number: DS31016 Rev. 4 - 2
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AP1509
150KHz, 2A PWM BUCK DC/DC CONVERTER Electrical Characteristics (Continued)
Specifications with boldface type are for full operating temperature range, the other type are for TJ = 25C.
Symbol
VFB
Parameter
Output Feedback Efficiency Output Voltage Efficiency Output Voltage Efficiency Output Voltage Efficiency
Conditions
4.5V < VIN < 22V 0.2A < ILOAD < 2A VOUT programmed for 3V VIN = 12V, ILOAD=2A 4.75V < VIN < 22V 0.2A < ILOAD < 2A VIN = 12V, ILOAD = 2A 7V < VIN < 22V 0.2A < ILOAD < 2A VIN = 12V, ILOAD = 2A 15V < VIN < 22V 0.2A < ILOAD < 2A VIN = 15V, ILOAD = 2A
VMin
1.193 1.18 76 3.168 3.135 78 4.8 4.75 83 11.52 11.4 90
Typ.
1.23 76 3.3 78 5 83 12 90
VMax
1.267 1.28
Unit
V %
AP1509-ADJ
VOUT
AP1509-3.3V
3.432 3.465
V %
VOUT
AP1509-5V
5.2 5.25
V %
VOUT
AP1509-12V
12.48 12.6
V %
AP1509
Document number: DS31016 Rev. 4 - 2
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AP1509
150KHz, 2A PWM BUCK DC/DC CONVERTER Typical Performance Characteristics
AP1509 Efficiency vs. Temperature (VIN=12V, VOUT=5V, Io=2A)
86 85 84 83 82 81 80 79 78 77 76 75 -50 -30 -10 10 30 50 70 90 110 130 150
AP1509 Efficiency vs. Temperature (VIN=12V, VOUT=3.3V, Io=2A)
81 80 79
Efficiency (%)
Efficiency (%)
78 77 76 75 74 73 -50 -30 -10 10 30 50 70 90 110 130 150
Temperature (TA) (C)
Temperature (TA) (C)
AP1509 Saturation Voltage vs. Temperature (VIN =12V, VFB=0V, VSD=0)
1.4 1.3
AP1509 Switch Current Limit vs. Temperature (VIN=12V, VFB=0V)
5.5
Switch Current Limit (A)
Saturation Voltage (V)
5 4.5 4 3.5 3
1.2 2A 1.1 1 0.9 0.8 0.7 -50 -25 0 25 50 75 100 125 1A 0.5A
-50
-30
-10
10
30
50
70
90
Temperature (TA)(C)
Temperature (TA) (C)
AP1509 Supply Current vs. Temperature (VIN=12V, No Load, Von/off =0V(Switch ON) ,Von/off =5V(Switch OFF))
15 14 13 12 11 10 9 8 7 6 5
60
Supply Current (mA)
Supply Current (uA)
55 50 45 40 35 30 Switch OFF
Switch ON
-50 -30 -10 10
30
50
70
90 110 130 150
-50 -30 -10 10
30
50
70
90 110 130 150
Temperature (TA) (C)
Temperature (TA) (C)
AP1509
Document number: DS31016 Rev. 4 - 2
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AP1509
150KHz, 2A PWM BUCK DC/DC CONVERTER Typical Performance Characteristics (Continued)
AP1509 Threshold Voltage vs. Temperature (VIN=12V, Io=100mA)
1.7 1.6
AP1509 ON/OFF Current vs. ON/OFF Voltage (VIN=12V)
10 0 -10 -20 -30 -40 -50 -60 -70 -80 -90 -100 0 3 6 9 12 15 18 21
Threshold Voltage (V)
1.4 1.3 1.2 1.1 1 0.9 0.8 -50 -30 -10 10 30 50 70 90 110 130 150
Temperature (TA) (C)
ON/OFF Current (nA)
1.5
ON/OFF Voltage (V)
AP1509 Frequency vs. Temperature (VIN=12V, Io=500mA, VOUT=5V)
170
AP1509 Feedback Current vs. Temperature (VIN=12V, VOUT=5V, Vfb=1.3V)
10
160 155 150 145 140 -50 -30 -10 10 30 50 70 90 110 130 150
Feedback Current (nA)
165
0 -10 -20 -30 -40 -50 -50 -30 -10 10 30 50 70 90 110 130 150
Frequency (KHz)
Temperature (TA) (C)
Temperature (TA) (C)
AP1509 Output Voltage vs. Temperature (VIN=12V, Io=2A)
3.5 3.45 3.4 3.35 3.3 3.25 3.2 3.15 3.1 3.05 3 2.95 2.9 -40 -20
V OUT (V)
0
20
40
60
80 100 120 140 160
Temperature (TA) (C)
AP1509
Document number: DS31016 Rev. 4 - 2
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AP1509
150KHz, 2A PWM BUCK DC/DC CONVERTER Typical Performance Characteristics (Continued)
Header Frequency vs. Temperature
1000 900 800 700 600 500 400 300 200 100 0 -40 10 60
o
Feedback Voltage vs. Temperature (VIN=15V, VOUT=5V)
1.26
Feedback Voltage (V)
110
Frequency (KHz)
1.25
1.24
1.23
1.22 -40 10 60
o
110
Temperature ( C)
Temperature ( C)
Supply Current vs. Temperature (VIN=15V, VOUT=5V, lOUT=0A)
3
Supply Current vs. Supply Voltage (VIN=15V, VOUT=5V, lOUT=0A)
3 2.5
Supply Current (mA)
2.5
Supply Current (mA)
2 1.5 1 0.5 0 -40 10
2 1.5 1 0.5 0
Temperature ( C)
o
60
110
0
5
10
15
Supply Voltage (V)
Efficiency vs. Output Current (VIN=15V, VOUT=5V)
90 85
Efficiency vs. Output Current (VIN=15V, VOUT=3.3V)
85
Efficiency (%)
80
Efficiency (%)
75
65
75
70 0 20 40 60
55 0 20 40 60
Output Current (mA)
Output Current (mA)
AP1509
Document number: DS31016 Rev. 4 - 2
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AP1509
150KHz, 2A PWM BUCK DC/DC CONVERTER Functions Description
Pin Functions +VIN This is the positive input supply for the IC switching regulator. A suitable input bypass capacitor must be presented at this pin to minimize voltage transients and to supply the switching currents needed by the regulator. Ground Circuit ground. Output Internal switch. The voltage at this pin switches between (+VIN - VSAT) and approximately - 0.5V, with a duty cycle of approximately VOUT / VIN. To minimize coupling to sensitive circuitry, the PC board copper area connected to this pin should be minimized. Feedback Senses the regulated output voltage to complete the feedback loop. SD Allows the switching regulator circuit to be shutdown using logic level signals thus dropping the total input supply current to approximately 150uA. Pulling this pin below a threshold voltage of approximately 1.3V turns the regulator on, and pulling this pin above 1.3V (up to a maximum of 18V) shuts the regulator down. If this shutdown feature is not needed, the SD pin can be wired to the ground pin. Thermal Considerations The SOP-8L package needs a heat sink under most conditions. The size of the heat sink depends on the input voltage, the output voltage, the load current and the ambient temperature. The AP1509 junction temperature rises above ambient temperature for a 2A load and different input and output voltages. The data for these curves was taken with the AP1509 (SOP-8L package) operating as a buck-switching regulator in an ambient temperature of 25oC (still air). These temperature increments are all approximate and are affected by many factors. Higher ambient temperatures require more heat sinker.
For the best thermal performance, wide copper traces and generous amounts of printed circuit board copper should be used in the board layout (One exception is the output (switch) pin, which should not have large areas of copper). Large areas of copper provide the best transfer of heat (lower thermal resistance) to the surrounding air, and moving air lowers the thermal resistance even further. Package thermal resistance and junction temperature increments are all approximate. The increments are affected by a lot of factors. Some of these factors include board size, shape, thickness, position, location, and even board temperature. Other factors are, trace width, total printed circuit copper area, copper thickness, single or double-sided, multi-layer board and the amount of solder on the board. The effectiveness of the PC board to dissipate heat also depends on the size, quantity and spacing of other components on the board, as well as whether the surrounding air is still or moving. Furthermore, some of these components such as the catch diode will add heat to the PC board and the heat can vary as the input voltage changes. For the inductor, depending on the physical size, type of core material and the DC resistance, it could either act as a heat sink taking heat away from the board, or it could add heat to the board.
AP1509
Document number: DS31016 Rev. 4 - 2
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AP1509
150KHz, 2A PWM BUCK DC/DC CONVERTER Ordering Information
AP1509 - XX S X - 13 Output Version Blank : Adjustable 33 : 3.3V 50 : 5.0V 12 : 12V
Package Code S S
Package S : SOP-8L
Lead Free L : Lead Free G : Green
Packing 13 : Tape & Reel
Device
AP1509-XXSL-13 AP1509-XXSG-13
Notes:
Packaging (Note 2) SOP-8L SOP-8L
13" Tape and Reel Quantity Part Number Suffix 2500/Tape & Reel -13 2500/Tape & Reel -13
2. Pad layout as shown on Diodes Inc. suggested pad layout document AP02001, which can be found on our website at http://www.diodes.com/datasheets/ap02001.pdf.
Marking Information
(1) SOP-8L
( Top View )
8 5
Logo Part No. Output Type : Blank : Adjustable 1509-33 : 3.3V 1509-50 : 5.0V 1509-12 : 12V
1509-XX YY WW X X
1 4
L : Lead Free G : Green YY : Year : 08, 09,10~ WW : Week : 01~52; 52 represents 52 and 53 week X : Internal Code
AP1509
Document number: DS31016 Rev. 4 - 2
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AP1509
150KHz, 2A PWM BUCK DC/DC CONVERTER Package Outline Dimensions (All Dimensions in mm)
(1) Package Type: SOP-8L
3.85/3.95
5.90/6.10
0.10/0.20
0.254 0.62/0.82
Gauge Plane Seating Plane
Detail "A"
7~9 1.30/1.50 1.75max. 0.15/0.25
0.35max. 45
7~9
Detail "A"
0/8
1.27typ 4.85/4.95
0.3/0.5
8x-0.60 5.4 6x-1.27 8x-1.55
Land Pattern Recommendation (Unit: mm)
AP1509
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AP1509
150KHz, 2A PWM BUCK DC/DC CONVERTER
IMPORTANT NOTICE 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. 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 (c) 2010, Diodes Incorporated www.diodes.com
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