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AP1509
150KHz, 2A PWM BUCK DC/DC CONVERTER
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 for Lead Free and "Green" products (Note 1)
General Description
The AP1509 series are monolithic IC designed for a step-down 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 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.
Applications
* * * Simple High-Efficiency Step-Down Regulator On-Card Switching Regulators Positive to Negative Converter
Ordering Information
AP1509 Output version Blank : Adjustable 33 : 3.3V 50 : 5.0V 12 : 12V
XX X X X Lead Free L: Lead Free G: Green Packing -U : Tube -13: Taping
Package S: SOP-8L
Device
AP1509-XXS
Package Packaging Code (Note 1)
S SOP-8L
Tube Part Number Quantity Suffix
100 -U
-13" Tape and Reel Part Number Quantity Suffix
2500/Tape & Reel -13
Note: 1. 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.
AP1509 Rev. 1
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AP1509
150KHz, 2A PWM BUCK DC/DC CONVERTER
Pin Assignments
(Top View) VIN Output FB SD 1 2 3 4 8 7 6 5 SOP-8L GND GND GND GND
Pin Descriptions
Name VIN Output GND FB SD
Description Operating voltage input Switching output Ground Output voltage feedback control ON/OFF Shutdown
Block Diagram
SD
VIN
200mV Current Source bias 1.235V Reference 2.5V Regulator Start up 220mV
+ Comp _
Comp +
FB
Comp +
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_
+ Amp _
Frequecy compensation
Pre-driver
150kHz OSC.
Thermal Shutdown
_
2A Switch
Output Gnd
DECEMBER 2006
(c) Diodes Incorporated
AP1509
150KHz, 2A PWM BUCK DC/DC CONVERTER
Absolute Maximum Ratings
Symbol VCC VSD VFB VOUT PD TST TOP VOP Parameter Supply Voltage ON/OFF Pin Input Voltage Feedback Pin Voltage Output Voltage to Ground Power Dissipation Storage Temperature Operating Temperature Operating Voltage Rating +24 -0.3 to +18 -0.3 to +18 -1 Internally Limited -65 to +150 -40 to +125 +4.5 to +22 Unit V V V V W
o o
C C
V
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AP1509
150KHz, 2A PWM BUCK DC/DC CONVERTER
Electrical Characteristics (All Output Voltage Versions)
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 IL IQ ISTBY VIL VIH IH IL JC JA
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 ON/OFF Pin Logic Input Current ON/OFF Pin Input Current Thermal Resistance Thermal Resistance with a copper area of approximately 3 in2
Conditions VFB = 1.3V (Adjustable version only)
Min. 127 110
Typ. -10 150 30 1.25 100 0
Max. -50 -100 173 173 50 1.4 1.5
Unit nA KHz KHz V % A
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) VLOGIC = 2.5V (OFF) VLOGIC = 0.5V (ON) SOP-8L SOP-8L Junction to case Junction to ambient
10
3 -200 -5 5 70 2.0 1.3 10 150 200 0.6 -0.01
uA mA mA uA V
uA -0.1 15 70 -1
o
C/W C/W
o
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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
AP1509-3.3V
VOUT VOUT VOUT
3.432 3.465 5.2 5.25 12.48 12.6
V % V % V %
AP1509-5V
AP1509-12V
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AP1509
150KHz, 2A PWM BUCK DC/DC CONVERTER
Typical Application Circuit
(1) Fixed Type Circuit
FB 12V DC Input Vin Cin Capacitor 1 4 3 Output L1 47uH Inductor 3.3V/2A Output Load
AP1509 -33
5 6 7
2 8
SD GNDGNDGND GND
D1 Schottky Diode
Co Capacitor
(2) Adjustable Type Circuit
R2 1K 12V DC Input Vin Cin Capacitor 1 FB 3 R1 1K L1 39uH Inductor D1 Schottky Diode Co Capacitor 2.5V/2A Output Load
AP1509
2
Output
56 78 4 SD Gnd Gnd Gnd Gnd
Vout = VFB x (1 + 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
R1 R2
)
R1 1K L1 39uH Inductor D1 Schottky Diode Co Capacitor 2.5V/2A Output Load
AP1509
5 6 7
2 8
Output
SD Gnd Gnd Gnd Gnd
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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 (Vcc=12V, Vfb=0V, VSD=0)
1.4 1.3
AP1509 Switch Current Limit vs. Temperature (Vcc = 12V, Vfb = 0V)
5.5
Switch Current Limit (A)
Saturation Voltage (V)
1.2 1.1 1 0.9 0.8 0.7 -50 -25 0 25 1A 0.5A
5 4.5 4 3.5 3 -50 -30 -10 10 30 50 70 90
2A
50
75
100
125
Temperature (TA)(C)
Temperature (TA) (C)
AP1509 Supply Current vs. Temperature (Vcc=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 -50 -30 -10 10 30 50 70 90 110 130 150 Switch OFF
Switch ON
-50 -30 -10 10
30
50
70
90 110 130 150
Temperature (TA) (C)
Temperature (TA) (C)
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AP1509
150KHz, 2A PWM BUCK DC/DC CONVERTER
Typical Performance Characteristics (Continued)
AP1509 Threshold Voltage vs. Temperature (Vcc=12V, Io=100mA)
1.7 1.6 1.5 1.4 1.3 1.2 1.1 1 0.9 0.8 -50 -30 -10 10 30 50 70 90 110 130 150
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)
Temperature (TA) (C)
ON/OFF Current (nA)
ON/OFF Voltage (V)
AP1509 Frequency vs. Temperature (Vcc=12V, Io=500mA, Vout=5V)
170
AP1509 Feedback Current vs. Temperature (Vcc=12V, Vout=5V, Vfb=1.3V)
10
Frequency (KHz)
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
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
Vout (V)
Temperature (TA) (C)
0
20
40
60
80 100 120 140 160
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AP1509
150KHz, 2A PWM BUCK DC/DC CONVERTER
Function 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-8 package) operating as a buck-switching regulator in an ambient o temperature of 25 C (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 Rev. 1
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AP1509
150KHz, 2A PWM BUCK DC/DC CONVERTER
Typical Performance Characteristics
Frequency vs. Temperature Vin = 5V; Vout = 15V
1000 900 800 700 600 500 400 300 200 100 0 -40
Feedback Voltage vs. Temperature Vin = 5V; Vout = 15V
1.26
Feedback Voltage (V)
10 60 110
Frequency (KHz)
1.25
1.24 1.23
1.22 -40
10
60
110
Temperature (oC)
Temperature (oC)
Supply Current vs. Temperature Vin = 5V; Vout = 15V; Iout = 0A
3 2.5 2 1.5 1 0.5 0 -40
Supply Current vs. Supply Voltage Vout = 15V; Iout = 0A
3 2.5
Supply Current (mA)
Supply Current (mA)
10 60 110
2 1.5 1 0.5 0
Temperature (oC)
0
5
10
15
Supply Voltage (V)
Efficiency vs. Output Current Vin = 5V; Vout = 15V
90 85
Efficiency vs. Output Current Vin = 3.3V; Vout = 15V
85
Efficiency (%)
80 75
Efficiency (%)
75
65
70 0 20 40 60
55 0 20 40 60
Output Current (mA)
.
Output Current (mA)
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AP1509
150KHz, 2A PWM BUCK DC/DC CONVERTER
Marking Information
(1) SOP-8L
(Top view) Part Number Output Type: Blank: Adjustable 33: 3.3V 50: 5.0V 12: 12V
Logo
1509-XX YY WW XX
G: Green Date Code X: Internal code WW: Nth week YY: Year
Package Information
(1) SOP-8L
3.70/4.10
5.79/6.20
0.08/0.25
0.254 0.38/1.27
Gauge Plane Seating Plane
Detail "A"
7~9 1.30/1.50 1.75max. 0.20typ 7~9
0.35max. 45
Detail "A"
3.70/4.10
1.27typ 4.80/5.30
0.3/0.5
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AP1509
150KHz, 2A PWM BUCK DC/DC CONVERTER
IMPORTANT NOTICE Diodes Incorporated and its subsidiaries reserve the right to make modifications, enhancements, improvements, corrections or other changes without further notice to any product herein. Diodes Incorporated does not assume any liability arising out of the application or use of any product described herein; neither does it convey any license under its patent rights, nor the rights of others. The user of products 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 our website, harmless against all damages. LIFE SUPPORT Diodes Incorporated products are not authorized for use as critical components in life support devices or systems without the expressed written approval of the President of Diodes Incorporated.
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